diff mbox series

[XEN,3/8] xen: Update Kconfig to Linux v5.4

Message ID 20191212182740.2190199-4-anthony.perard@citrix.com (mailing list archive)
State Superseded
Headers show
Series xen: Kconfig update with few extra | expand

Commit Message

Anthony PERARD Dec. 12, 2019, 6:27 p.m. UTC
This patch updates Kconfig to a more recent version of Kconfig, found
in Linux v5.4.0, 219d54332a09 ("Linux 5.4").

With the updated version of Kconfig, other changes are necessary to
avoid breaking the build.

Kconfig files:
- fix Kconfig files that where using option env=*:
  Since Linux commit 104daea149c4 ("kconfig: reference environment
  variables directly and remove 'option env='"), we can access the
  environment directly via $() and "option env=" as been removed.
- CONFIG_EXPERT='y' will now appear in .config file if
  XEN_CONFIG_EXPERT=y in the environment. The alternative is to change
  "EXPERT" to "$(XEN_CONFIG_EXPERT)" in all Kconfig files.

Makefile:
- silentoldconfig target as been removed from Kconfig. To update
  include/generated/autoconf.h, we need to use syncconfig target
  instead.

Makefile.kconfig:
- Import newer needed code from Linux's Makefile.lib and
  Kbuild.include and Makefile.build.
- Set Q to empty, Xen build system doesn't silence commands. Having Q
  empty mean we can import stuff from Linux without having to remove the
  leading $(Q) from build commands. And quiet='' means commands will be
  echoed.
- Add $(PHONY) to .PHONY. Like it is intended by Kbuild.

Makefile.host is also updated and copied from Linux.

Dependency change:
- Now depends on flex/bison, maybe we could _shipped those files like
  before. Linux doesn't do that anymore.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 docs/misc/kconfig-language.rst                |  701 +++++
 docs/misc/kconfig-language.txt                |  395 ---
 docs/misc/kconfig-macro-language.rst          |  247 ++
 docs/misc/{kconfig.txt => kconfig.rst}        |  185 +-
 xen/.gitignore                                |    2 +
 xen/Kconfig                                   |   18 +-
 xen/Makefile                                  |    4 +-
 xen/arch/arm/Kconfig                          |    2 +-
 xen/common/Kconfig                            |   12 +-
 xen/tools/kconfig/.gitignore                  |    6 +-
 xen/tools/kconfig/Makefile                    |  268 +-
 xen/tools/kconfig/Makefile.host               |  121 +-
 xen/tools/kconfig/Makefile.kconfig            |   52 +-
 xen/tools/kconfig/conf.c                      |  191 +-
 xen/tools/kconfig/confdata.c                  |  491 ++--
 xen/tools/kconfig/expr.c                      |  213 +-
 xen/tools/kconfig/expr.h                      |  108 +-
 xen/tools/kconfig/gconf-cfg.sh                |   30 +
 xen/tools/kconfig/gconf.c                     |   39 +-
 xen/tools/kconfig/images.c                    |   34 +-
 xen/tools/kconfig/images.h                    |   33 +
 xen/tools/kconfig/lexer.l                     |  471 +++
 xen/tools/kconfig/list.h                      |    1 +
 xen/tools/kconfig/lkc.h                       |   38 +-
 xen/tools/kconfig/lkc_proto.h                 |   21 +-
 xen/tools/kconfig/lxdialog/.gitignore         |    4 -
 xen/tools/kconfig/lxdialog/BIG.FAT.WARNING    |    2 +-
 xen/tools/kconfig/lxdialog/check-lxdialog.sh  |   91 -
 xen/tools/kconfig/lxdialog/checklist.c        |   15 +-
 xen/tools/kconfig/lxdialog/dialog.h           |   17 +-
 xen/tools/kconfig/lxdialog/inputbox.c         |   18 +-
 xen/tools/kconfig/lxdialog/menubox.c          |   15 +-
 xen/tools/kconfig/lxdialog/textbox.c          |   15 +-
 xen/tools/kconfig/lxdialog/util.c             |   15 +-
 xen/tools/kconfig/lxdialog/yesno.c            |   15 +-
 xen/tools/kconfig/mconf-cfg.sh                |   47 +
 xen/tools/kconfig/mconf.c                     |   27 +-
 xen/tools/kconfig/menu.c                      |  288 +-
 xen/tools/kconfig/merge_config.sh             |   87 +-
 xen/tools/kconfig/nconf-cfg.sh                |   47 +
 xen/tools/kconfig/nconf.c                     |   42 +-
 xen/tools/kconfig/nconf.gui.c                 |   30 +-
 xen/tools/kconfig/nconf.h                     |    9 +-
 xen/tools/kconfig/{zconf.y => parser.y}       |  409 ++-
 xen/tools/kconfig/preprocess.c                |  574 ++++
 xen/tools/kconfig/qconf-cfg.sh                |   32 +
 xen/tools/kconfig/qconf.cc                    |  750 +++--
 xen/tools/kconfig/qconf.h                     |  153 +-
 xen/tools/kconfig/streamline_config.pl        |   53 +-
 xen/tools/kconfig/symbol.c                    |  295 +-
 xen/tools/kconfig/tests/auto_submenu/Kconfig  |   52 +
 .../kconfig/tests/auto_submenu/__init__.py    |   13 +
 .../tests/auto_submenu/expected_stdout        |   10 +
 xen/tools/kconfig/tests/choice/Kconfig        |   56 +
 xen/tools/kconfig/tests/choice/__init__.py    |   41 +
 .../tests/choice/alldef_expected_config       |    5 +
 .../tests/choice/allmod_expected_config       |    9 +
 .../tests/choice/allno_expected_config        |    5 +
 .../tests/choice/allyes_expected_config       |    9 +
 .../tests/choice/oldask0_expected_stdout      |   10 +
 xen/tools/kconfig/tests/choice/oldask1_config |    2 +
 .../tests/choice/oldask1_expected_stdout      |   15 +
 .../tests/choice_value_with_m_dep/Kconfig     |   21 +
 .../tests/choice_value_with_m_dep/__init__.py |   16 +
 .../tests/choice_value_with_m_dep/config      |    2 +
 .../choice_value_with_m_dep/expected_config   |    3 +
 .../choice_value_with_m_dep/expected_stdout   |    4 +
 xen/tools/kconfig/tests/conftest.py           |  291 ++
 .../kconfig/tests/err_recursive_dep/Kconfig   |   63 +
 .../tests/err_recursive_dep/__init__.py       |   10 +
 .../tests/err_recursive_dep/expected_stderr   |   38 +
 .../kconfig/tests/err_recursive_inc/Kconfig   |    2 +
 .../tests/err_recursive_inc/Kconfig.inc1      |    5 +
 .../tests/err_recursive_inc/Kconfig.inc2      |    4 +
 .../tests/err_recursive_inc/Kconfig.inc3      |    2 +
 .../tests/err_recursive_inc/__init__.py       |   11 +
 .../tests/err_recursive_inc/expected_stderr   |    6 +
 xen/tools/kconfig/tests/inter_choice/Kconfig  |   25 +
 .../kconfig/tests/inter_choice/__init__.py    |   15 +
 .../kconfig/tests/inter_choice/defconfig      |    1 +
 .../tests/inter_choice/expected_config        |    4 +
 .../kconfig/tests/new_choice_with_dep/Kconfig |   39 +
 .../tests/new_choice_with_dep/__init__.py     |   15 +
 .../kconfig/tests/new_choice_with_dep/config  |    3 +
 .../tests/new_choice_with_dep/expected_stdout |   10 +
 .../tests/no_write_if_dep_unmet/Kconfig       |   16 +
 .../tests/no_write_if_dep_unmet/__init__.py   |   20 +
 .../tests/no_write_if_dep_unmet/config        |    1 +
 .../no_write_if_dep_unmet/expected_config     |    5 +
 .../tests/preprocess/builtin_func/Kconfig     |   27 +
 .../tests/preprocess/builtin_func/__init__.py |    9 +
 .../preprocess/builtin_func/expected_stderr   |    5 +
 .../preprocess/builtin_func/expected_stdout   |    1 +
 .../preprocess/circular_expansion/Kconfig     |    5 +
 .../preprocess/circular_expansion/__init__.py |   11 +
 .../circular_expansion/expected_stderr        |    1 +
 .../kconfig/tests/preprocess/escape/Kconfig   |   44 +
 .../tests/preprocess/escape/__init__.py       |    8 +
 .../tests/preprocess/escape/expected_stderr   |   10 +
 .../kconfig/tests/preprocess/variable/Kconfig |   53 +
 .../tests/preprocess/variable/__init__.py     |    8 +
 .../tests/preprocess/variable/expected_stderr |    9 +
 xen/tools/kconfig/tests/pytest.ini            |    7 +
 .../kconfig/tests/rand_nested_choice/Kconfig  |   35 +
 .../tests/rand_nested_choice/__init__.py      |   17 +
 .../tests/rand_nested_choice/expected_stdout0 |    2 +
 .../tests/rand_nested_choice/expected_stdout1 |    4 +
 .../tests/rand_nested_choice/expected_stdout2 |    5 +
 xen/tools/kconfig/util.c                      |   86 +-
 xen/tools/kconfig/zconf.gperf                 |   49 -
 xen/tools/kconfig/zconf.hash.c_shipped        |  293 --
 xen/tools/kconfig/zconf.l                     |  374 ---
 xen/tools/kconfig/zconf.lex.c_shipped         | 2473 ----------------
 xen/tools/kconfig/zconf.tab.c_shipped         | 2580 -----------------
 114 files changed, 5639 insertions(+), 8069 deletions(-)
 create mode 100644 docs/misc/kconfig-language.rst
 delete mode 100644 docs/misc/kconfig-language.txt
 create mode 100644 docs/misc/kconfig-macro-language.rst
 rename docs/misc/{kconfig.txt => kconfig.rst} (70%)
 create mode 100644 xen/.gitignore
 create mode 100755 xen/tools/kconfig/gconf-cfg.sh
 create mode 100644 xen/tools/kconfig/images.h
 create mode 100644 xen/tools/kconfig/lexer.l
 delete mode 100644 xen/tools/kconfig/lxdialog/.gitignore
 delete mode 100755 xen/tools/kconfig/lxdialog/check-lxdialog.sh
 create mode 100755 xen/tools/kconfig/mconf-cfg.sh
 create mode 100755 xen/tools/kconfig/nconf-cfg.sh
 rename xen/tools/kconfig/{zconf.y => parser.y} (66%)
 create mode 100644 xen/tools/kconfig/preprocess.c
 create mode 100755 xen/tools/kconfig/qconf-cfg.sh
 create mode 100644 xen/tools/kconfig/tests/auto_submenu/Kconfig
 create mode 100644 xen/tools/kconfig/tests/auto_submenu/__init__.py
 create mode 100644 xen/tools/kconfig/tests/auto_submenu/expected_stdout
 create mode 100644 xen/tools/kconfig/tests/choice/Kconfig
 create mode 100644 xen/tools/kconfig/tests/choice/__init__.py
 create mode 100644 xen/tools/kconfig/tests/choice/alldef_expected_config
 create mode 100644 xen/tools/kconfig/tests/choice/allmod_expected_config
 create mode 100644 xen/tools/kconfig/tests/choice/allno_expected_config
 create mode 100644 xen/tools/kconfig/tests/choice/allyes_expected_config
 create mode 100644 xen/tools/kconfig/tests/choice/oldask0_expected_stdout
 create mode 100644 xen/tools/kconfig/tests/choice/oldask1_config
 create mode 100644 xen/tools/kconfig/tests/choice/oldask1_expected_stdout
 create mode 100644 xen/tools/kconfig/tests/choice_value_with_m_dep/Kconfig
 create mode 100644 xen/tools/kconfig/tests/choice_value_with_m_dep/__init__.py
 create mode 100644 xen/tools/kconfig/tests/choice_value_with_m_dep/config
 create mode 100644 xen/tools/kconfig/tests/choice_value_with_m_dep/expected_config
 create mode 100644 xen/tools/kconfig/tests/choice_value_with_m_dep/expected_stdout
 create mode 100644 xen/tools/kconfig/tests/conftest.py
 create mode 100644 xen/tools/kconfig/tests/err_recursive_dep/Kconfig
 create mode 100644 xen/tools/kconfig/tests/err_recursive_dep/__init__.py
 create mode 100644 xen/tools/kconfig/tests/err_recursive_dep/expected_stderr
 create mode 100644 xen/tools/kconfig/tests/err_recursive_inc/Kconfig
 create mode 100644 xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc1
 create mode 100644 xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc2
 create mode 100644 xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc3
 create mode 100644 xen/tools/kconfig/tests/err_recursive_inc/__init__.py
 create mode 100644 xen/tools/kconfig/tests/err_recursive_inc/expected_stderr
 create mode 100644 xen/tools/kconfig/tests/inter_choice/Kconfig
 create mode 100644 xen/tools/kconfig/tests/inter_choice/__init__.py
 create mode 100644 xen/tools/kconfig/tests/inter_choice/defconfig
 create mode 100644 xen/tools/kconfig/tests/inter_choice/expected_config
 create mode 100644 xen/tools/kconfig/tests/new_choice_with_dep/Kconfig
 create mode 100644 xen/tools/kconfig/tests/new_choice_with_dep/__init__.py
 create mode 100644 xen/tools/kconfig/tests/new_choice_with_dep/config
 create mode 100644 xen/tools/kconfig/tests/new_choice_with_dep/expected_stdout
 create mode 100644 xen/tools/kconfig/tests/no_write_if_dep_unmet/Kconfig
 create mode 100644 xen/tools/kconfig/tests/no_write_if_dep_unmet/__init__.py
 create mode 100644 xen/tools/kconfig/tests/no_write_if_dep_unmet/config
 create mode 100644 xen/tools/kconfig/tests/no_write_if_dep_unmet/expected_config
 create mode 100644 xen/tools/kconfig/tests/preprocess/builtin_func/Kconfig
 create mode 100644 xen/tools/kconfig/tests/preprocess/builtin_func/__init__.py
 create mode 100644 xen/tools/kconfig/tests/preprocess/builtin_func/expected_stderr
 create mode 100644 xen/tools/kconfig/tests/preprocess/builtin_func/expected_stdout
 create mode 100644 xen/tools/kconfig/tests/preprocess/circular_expansion/Kconfig
 create mode 100644 xen/tools/kconfig/tests/preprocess/circular_expansion/__init__.py
 create mode 100644 xen/tools/kconfig/tests/preprocess/circular_expansion/expected_stderr
 create mode 100644 xen/tools/kconfig/tests/preprocess/escape/Kconfig
 create mode 100644 xen/tools/kconfig/tests/preprocess/escape/__init__.py
 create mode 100644 xen/tools/kconfig/tests/preprocess/escape/expected_stderr
 create mode 100644 xen/tools/kconfig/tests/preprocess/variable/Kconfig
 create mode 100644 xen/tools/kconfig/tests/preprocess/variable/__init__.py
 create mode 100644 xen/tools/kconfig/tests/preprocess/variable/expected_stderr
 create mode 100644 xen/tools/kconfig/tests/pytest.ini
 create mode 100644 xen/tools/kconfig/tests/rand_nested_choice/Kconfig
 create mode 100644 xen/tools/kconfig/tests/rand_nested_choice/__init__.py
 create mode 100644 xen/tools/kconfig/tests/rand_nested_choice/expected_stdout0
 create mode 100644 xen/tools/kconfig/tests/rand_nested_choice/expected_stdout1
 create mode 100644 xen/tools/kconfig/tests/rand_nested_choice/expected_stdout2
 delete mode 100644 xen/tools/kconfig/zconf.gperf
 delete mode 100644 xen/tools/kconfig/zconf.hash.c_shipped
 delete mode 100644 xen/tools/kconfig/zconf.l
 delete mode 100644 xen/tools/kconfig/zconf.lex.c_shipped
 delete mode 100644 xen/tools/kconfig/zconf.tab.c_shipped

Comments

Andrew Cooper Dec. 12, 2019, 6:45 p.m. UTC | #1
On 12/12/2019 18:27, Anthony PERARD wrote:
> This patch updates Kconfig to a more recent version of Kconfig, found
> in Linux v5.4.0, 219d54332a09 ("Linux 5.4").
>
> With the updated version of Kconfig, other changes are necessary to
> avoid breaking the build.
>
> Kconfig files:
> - fix Kconfig files that where using option env=*:
>   Since Linux commit 104daea149c4 ("kconfig: reference environment
>   variables directly and remove 'option env='"), we can access the
>   environment directly via $() and "option env=" as been removed.
> - CONFIG_EXPERT='y' will now appear in .config file if
>   XEN_CONFIG_EXPERT=y in the environment. The alternative is to change
>   "EXPERT" to "$(XEN_CONFIG_EXPERT)" in all Kconfig files.
>
> Makefile:
> - silentoldconfig target as been removed from Kconfig. To update
>   include/generated/autoconf.h, we need to use syncconfig target
>   instead.
>
> Makefile.kconfig:
> - Import newer needed code from Linux's Makefile.lib and
>   Kbuild.include and Makefile.build.
> - Set Q to empty, Xen build system doesn't silence commands. Having Q
>   empty mean we can import stuff from Linux without having to remove the
>   leading $(Q) from build commands. And quiet='' means commands will be
>   echoed.
> - Add $(PHONY) to .PHONY. Like it is intended by Kbuild.
>
> Makefile.host is also updated and copied from Linux.
>
> Dependency change:
> - Now depends on flex/bison, maybe we could _shipped those files like
>   before. Linux doesn't do that anymore.

Content like that should not be checked in to being with, and I think it
is entirely reasonable to require flex/bison in a build environment.

Indeed, README lists them as mandatory requirements.

> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>

Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Jan Beulich Dec. 13, 2019, 11:05 a.m. UTC | #2
Just two minor remarks:

On 12.12.2019 19:27, Anthony PERARD wrote:
> --- /dev/null
> +++ b/docs/misc/kconfig-macro-language.rst
> @@ -0,0 +1,247 @@
> +======================
> +Kconfig macro language
> +======================
> +
> +Concept
> +-------
> +
> +The basic idea was inspired by Make. When we look at Make, we notice sort of
> +two languages in one. One language describes dependency graphs consisting of
> +targets and prerequisites. The other is a macro language for performing textual
> +substitution.
> +
> +There is clear distinction between the two language stages. For example, you
> +can write a makefile like follows::
> +
> +    APP := foo
> +    SRC := foo.c
> +    CC := gcc
> +
> +    $(APP): $(SRC)
> +            $(CC) -o $(APP) $(SRC)
> +
> +The macro language replaces the variable references with their expanded form,
> +and handles as if the source file were input like follows::
> +
> +    foo: foo.c
> +            gcc -o foo foo.c
> +
> +Then, Make analyzes the dependency graph and determines the targets to be
> +updated.
> +
> +The idea is quite similar in Kconfig - it is possible to describe a Kconfig
> +file like this::
> +
> +    CC := gcc
> +
> +    config CC_HAS_FOO
> +            def_bool $(shell, $(srctree)/scripts/gcc-check-foo.sh $(CC))
> +
> +The macro language in Kconfig processes the source file into the following
> +intermediate::
> +
> +    config CC_HAS_FOO
> +            def_bool y
> +
> +Then, Kconfig moves onto the evaluation stage to resolve inter-symbol
> +dependency as explained in kconfig-language.txt.

.rst ?


> --- /dev/null
> +++ b/xen/.gitignore
> @@ -0,0 +1,2 @@
> +*.lex.c
> +*.tab.[ch]

Why do these get moved here from ...

> --- a/xen/tools/kconfig/.gitignore
> +++ b/xen/tools/kconfig/.gitignore
> @@ -1,12 +1,8 @@
>  #
>  # Generated files
>  #
> -config*
> -*.lex.c
> -*.tab.c
> -*.tab.h
> -zconf.hash.c
>  *.moc
> +*conf-cfg

here?

Jan
Anthony PERARD Dec. 13, 2019, 3:31 p.m. UTC | #3
On Thu, Dec 12, 2019 at 06:45:02PM +0000, Andrew Cooper wrote:
> On 12/12/2019 18:27, Anthony PERARD wrote:
> > Dependency change:
> > - Now depends on flex/bison, maybe we could _shipped those files like
> >   before. Linux doesn't do that anymore.
> 
> Content like that should not be checked in to being with, and I think it
> is entirely reasonable to require flex/bison in a build environment.
> 
> Indeed, README lists them as mandatory requirements.

Hopefully, no one will notice that, even so they are mandatory on paper,
you could build Xen (with the tools) without needed flex/bison. :-)
But yes, I think flex/bison is like make, they are probably part of the
minimum list of packages that needs to be installed when building
anything on many distro.
Anthony PERARD Dec. 13, 2019, 3:49 p.m. UTC | #4
On Fri, Dec 13, 2019 at 12:05:11PM +0100, Jan Beulich wrote:
> Just two minor remarks:
> 
> On 12.12.2019 19:27, Anthony PERARD wrote:
> > --- /dev/null
> > +++ b/docs/misc/kconfig-macro-language.rst
[...]
> > +Then, Kconfig moves onto the evaluation stage to resolve inter-symbol
> > +dependency as explained in kconfig-language.txt.
> 
> .rst ?

Looks like it, but that's an upstream bug. I'll try to send a patch
upstream.

> > --- /dev/null
> > +++ b/xen/.gitignore
> > @@ -0,0 +1,2 @@
> > +*.lex.c
> > +*.tab.[ch]
> 
> Why do these get moved here from ...
> 
> > --- a/xen/tools/kconfig/.gitignore
> > +++ b/xen/tools/kconfig/.gitignore
> > @@ -1,12 +1,8 @@
> >  #
> >  # Generated files
> >  #
> > -config*
> > -*.lex.c
> > -*.tab.c
> > -*.tab.h
> > -zconf.hash.c
> >  *.moc
> > +*conf-cfg
> 
> here?

Well, it's more like they move from linux.git/scripts/kconfig/.gitignore
to linux.git/.gitignore

Thanks,
Jan Beulich Dec. 13, 2019, 4:59 p.m. UTC | #5
On 13.12.2019 16:49, Anthony PERARD wrote:
> On Fri, Dec 13, 2019 at 12:05:11PM +0100, Jan Beulich wrote:
>> On 12.12.2019 19:27, Anthony PERARD wrote:
>>> --- /dev/null
>>> +++ b/xen/.gitignore
>>> @@ -0,0 +1,2 @@
>>> +*.lex.c
>>> +*.tab.[ch]
>>
>> Why do these get moved here from ...
>>
>>> --- a/xen/tools/kconfig/.gitignore
>>> +++ b/xen/tools/kconfig/.gitignore
>>> @@ -1,12 +1,8 @@
>>>  #
>>>  # Generated files
>>>  #
>>> -config*
>>> -*.lex.c
>>> -*.tab.c
>>> -*.tab.h
>>> -zconf.hash.c
>>>  *.moc
>>> +*conf-cfg
>>
>> here?
> 
> Well, it's more like they move from linux.git/scripts/kconfig/.gitignore
> to linux.git/.gitignore

Which doesn't answer the why (for our repo).

Jan
Andrew Cooper Dec. 13, 2019, 7:17 p.m. UTC | #6
On 13/12/2019 16:59, Jan Beulich wrote:
> On 13.12.2019 16:49, Anthony PERARD wrote:
>> On Fri, Dec 13, 2019 at 12:05:11PM +0100, Jan Beulich wrote:
>>> On 12.12.2019 19:27, Anthony PERARD wrote:
>>>> --- /dev/null
>>>> +++ b/xen/.gitignore
>>>> @@ -0,0 +1,2 @@
>>>> +*.lex.c
>>>> +*.tab.[ch]
>>> Why do these get moved here from ...
>>>
>>>> --- a/xen/tools/kconfig/.gitignore
>>>> +++ b/xen/tools/kconfig/.gitignore
>>>> @@ -1,12 +1,8 @@
>>>>  #
>>>>  # Generated files
>>>>  #
>>>> -config*
>>>> -*.lex.c
>>>> -*.tab.c
>>>> -*.tab.h
>>>> -zconf.hash.c
>>>>  *.moc
>>>> +*conf-cfg
>>> here?
>> Well, it's more like they move from linux.git/scripts/kconfig/.gitignore
>> to linux.git/.gitignore
> Which doesn't answer the why (for our repo).

srsly?

We shouldn't edit headers we don't actually resync because it may make
resyncing harder (allegedly), yet we shouldn't keep an in-sync directory
in sync when we do actually resync it?

I find your lack of consistency in review requests impossible to predict.

As far as I'm concerned, Anthony's patch is fine.

~Andrew
Jan Beulich Dec. 16, 2019, 10:16 a.m. UTC | #7
On 13.12.2019 20:17, Andrew Cooper wrote:
> On 13/12/2019 16:59, Jan Beulich wrote:
>> On 13.12.2019 16:49, Anthony PERARD wrote:
>>> On Fri, Dec 13, 2019 at 12:05:11PM +0100, Jan Beulich wrote:
>>>> On 12.12.2019 19:27, Anthony PERARD wrote:
>>>>> --- /dev/null
>>>>> +++ b/xen/.gitignore
>>>>> @@ -0,0 +1,2 @@
>>>>> +*.lex.c
>>>>> +*.tab.[ch]
>>>> Why do these get moved here from ...
>>>>
>>>>> --- a/xen/tools/kconfig/.gitignore
>>>>> +++ b/xen/tools/kconfig/.gitignore
>>>>> @@ -1,12 +1,8 @@
>>>>>  #
>>>>>  # Generated files
>>>>>  #
>>>>> -config*
>>>>> -*.lex.c
>>>>> -*.tab.c
>>>>> -*.tab.h
>>>>> -zconf.hash.c
>>>>>  *.moc
>>>>> +*conf-cfg
>>>> here?
>>> Well, it's more like they move from linux.git/scripts/kconfig/.gitignore
>>> to linux.git/.gitignore
>> Which doesn't answer the why (for our repo).
> 
> srsly?
> 
> We shouldn't edit headers we don't actually resync because it may make
> resyncing harder (allegedly), yet we shouldn't keep an in-sync directory
> in sync when we do actually resync it?

What headers are you taking about? My question was about the placement
of .gitignore entries only. I'm pretty sure I had previously expressed
that I'm not overly happy to see needless scattering around of them.
I'm merely trying to understand if here we have a case of "needless".

> I find your lack of consistency in review requests impossible to predict.

What consistency? What's wrong with putting the two lines in the top
level .gitignore, or keeping them where they are? I anyway doubt
there's a need to keep our .gitignore in sync with Linux'es.

Jan
Anthony PERARD Dec. 16, 2019, 2:01 p.m. UTC | #8
On Mon, Dec 16, 2019 at 11:16:52AM +0100, Jan Beulich wrote:
> What headers are you taking about? My question was about the placement
> of .gitignore entries only. I'm pretty sure I had previously expressed
> that I'm not overly happy to see needless scattering around of them.
> I'm merely trying to understand if here we have a case of "needless".
>
> > I find your lack of consistency in review requests impossible to predict.
> 
> What consistency? What's wrong with putting the two lines in the top
> level .gitignore, or keeping them where they are? I anyway doubt
> there's a need to keep our .gitignore in sync with Linux'es.

I think scattering the .gitignore around make them easier to manage,
especially when entries aren't useful anymore. Otherwise, we end up
with a .gitignore at the root with entries that aren't needed anymore
because they can be hard to figure out if they are useful or not.
Or, when globing is involve, we could end-up ignoring files that
shouldn't.

I'm planning to import more of Kbuild, which Makefile.host comes from,
to build only the hypervisor, so there's going to be other artefact that
will be generated only in xen/. So I've added those two new entries in
xen/.gitignore in anticipation, and to avoid getting xen/tools/kconfig
out-of-sync with Linux's one (Well I didn't know those two entries were
there in the first place).

I could add "/xen/**/*.tab.[ch]" in the root .gitignore if you prefer
even though I don't like this approch.

Cheers,
Jan Beulich Dec. 16, 2019, 3:55 p.m. UTC | #9
On 16.12.2019 15:01, Anthony PERARD wrote:
> On Mon, Dec 16, 2019 at 11:16:52AM +0100, Jan Beulich wrote:
>> What headers are you taking about? My question was about the placement
>> of .gitignore entries only. I'm pretty sure I had previously expressed
>> that I'm not overly happy to see needless scattering around of them.
>> I'm merely trying to understand if here we have a case of "needless".
>>
>>> I find your lack of consistency in review requests impossible to predict.
>>
>> What consistency? What's wrong with putting the two lines in the top
>> level .gitignore, or keeping them where they are? I anyway doubt
>> there's a need to keep our .gitignore in sync with Linux'es.
> 
> I think scattering the .gitignore around make them easier to manage,
> especially when entries aren't useful anymore. Otherwise, we end up
> with a .gitignore at the root with entries that aren't needed anymore
> because they can be hard to figure out if they are useful or not.
> Or, when globing is involve, we could end-up ignoring files that
> shouldn't.

Right, especially this last point makes scattering entries have some
value. But then let's truly scatter them, not accumulate all sorts
of stuff in xen/.gitignore.

> I'm planning to import more of Kbuild, which Makefile.host comes from,
> to build only the hypervisor, so there's going to be other artefact that
> will be generated only in xen/. So I've added those two new entries in
> xen/.gitignore in anticipation, and to avoid getting xen/tools/kconfig
> out-of-sync with Linux's one (Well I didn't know those two entries were
> there in the first place).
> 
> I could add "/xen/**/*.tab.[ch]" in the root .gitignore if you prefer
> even though I don't like this approch.

But this then still is too wide a pattern, as per above. A
sufficiently specific one would be as good as one without path
in a .gitignore deep enough into the tree, if we wanted to go
the "truly scatter" route.

Jan
Anthony PERARD Dec. 16, 2019, 4:34 p.m. UTC | #10
On Mon, Dec 16, 2019 at 04:55:52PM +0100, Jan Beulich wrote:
> On 16.12.2019 15:01, Anthony PERARD wrote:
> > On Mon, Dec 16, 2019 at 11:16:52AM +0100, Jan Beulich wrote:
> >> What headers are you taking about? My question was about the placement
> >> of .gitignore entries only. I'm pretty sure I had previously expressed
> >> that I'm not overly happy to see needless scattering around of them.
> >> I'm merely trying to understand if here we have a case of "needless".
> >>
> >>> I find your lack of consistency in review requests impossible to predict.
> >>
> >> What consistency? What's wrong with putting the two lines in the top
> >> level .gitignore, or keeping them where they are? I anyway doubt
> >> there's a need to keep our .gitignore in sync with Linux'es.
> > 
> > I think scattering the .gitignore around make them easier to manage,
> > especially when entries aren't useful anymore. Otherwise, we end up
> > with a .gitignore at the root with entries that aren't needed anymore
> > because they can be hard to figure out if they are useful or not.
> > Or, when globing is involve, we could end-up ignoring files that
> > shouldn't.
> 
> Right, especially this last point makes scattering entries have some
> value. But then let's truly scatter them, not accumulate all sorts
> of stuff in xen/.gitignore.
> 
> > I'm planning to import more of Kbuild, which Makefile.host comes from,
> > to build only the hypervisor, so there's going to be other artefact that
> > will be generated only in xen/. So I've added those two new entries in
> > xen/.gitignore in anticipation, and to avoid getting xen/tools/kconfig
> > out-of-sync with Linux's one (Well I didn't know those two entries were
> > there in the first place).
> > 
> > I could add "/xen/**/*.tab.[ch]" in the root .gitignore if you prefer
> > even though I don't like this approch.
> 
> But this then still is too wide a pattern, as per above. A
> sufficiently specific one would be as good as one without path
> in a .gitignore deep enough into the tree, if we wanted to go
> the "truly scatter" route.

Fine, we can have those two entries into kconfig/.gitignore, with a note
in the commit message saying that the only thing different from
upstream. That's where they belong for now.
diff mbox series

Patch

diff --git a/docs/misc/kconfig-language.rst b/docs/misc/kconfig-language.rst
new file mode 100644
index 000000000000..74bef19f69f0
--- /dev/null
+++ b/docs/misc/kconfig-language.rst
@@ -0,0 +1,701 @@ 
+================
+Kconfig Language
+================
+
+Introduction
+------------
+
+The configuration database is a collection of configuration options
+organized in a tree structure::
+
+	+- Code maturity level options
+	|  +- Prompt for development and/or incomplete code/drivers
+	+- General setup
+	|  +- Networking support
+	|  +- System V IPC
+	|  +- BSD Process Accounting
+	|  +- Sysctl support
+	+- Loadable module support
+	|  +- Enable loadable module support
+	|     +- Set version information on all module symbols
+	|     +- Kernel module loader
+	+- ...
+
+Every entry has its own dependencies. These dependencies are used
+to determine the visibility of an entry. Any child entry is only
+visible if its parent entry is also visible.
+
+Menu entries
+------------
+
+Most entries define a config option; all other entries help to organize
+them. A single configuration option is defined like this::
+
+  config MODVERSIONS
+	bool "Set version information on all module symbols"
+	depends on MODULES
+	help
+	  Usually, modules have to be recompiled whenever you switch to a new
+	  kernel.  ...
+
+Every line starts with a key word and can be followed by multiple
+arguments.  "config" starts a new config entry. The following lines
+define attributes for this config option. Attributes can be the type of
+the config option, input prompt, dependencies, help text and default
+values. A config option can be defined multiple times with the same
+name, but every definition can have only a single input prompt and the
+type must not conflict.
+
+Menu attributes
+---------------
+
+A menu entry can have a number of attributes. Not all of them are
+applicable everywhere (see syntax).
+
+- type definition: "bool"/"tristate"/"string"/"hex"/"int"
+
+  Every config option must have a type. There are only two basic types:
+  tristate and string; the other types are based on these two. The type
+  definition optionally accepts an input prompt, so these two examples
+  are equivalent::
+
+	bool "Networking support"
+
+  and::
+
+	bool
+	prompt "Networking support"
+
+- input prompt: "prompt" <prompt> ["if" <expr>]
+
+  Every menu entry can have at most one prompt, which is used to display
+  to the user. Optionally dependencies only for this prompt can be added
+  with "if".
+
+- default value: "default" <expr> ["if" <expr>]
+
+  A config option can have any number of default values. If multiple
+  default values are visible, only the first defined one is active.
+  Default values are not limited to the menu entry where they are
+  defined. This means the default can be defined somewhere else or be
+  overridden by an earlier definition.
+  The default value is only assigned to the config symbol if no other
+  value was set by the user (via the input prompt above). If an input
+  prompt is visible the default value is presented to the user and can
+  be overridden by him.
+  Optionally, dependencies only for this default value can be added with
+  "if".
+
+ The default value deliberately defaults to 'n' in order to avoid bloating the
+ build. With few exceptions, new config options should not change this. The
+ intent is for "make oldconfig" to add as little as possible to the config from
+ release to release.
+
+ Note:
+	Things that merit "default y/m" include:
+
+	a) A new Kconfig option for something that used to always be built
+	   should be "default y".
+
+	b) A new gatekeeping Kconfig option that hides/shows other Kconfig
+	   options (but does not generate any code of its own), should be
+	   "default y" so people will see those other options.
+
+	c) Sub-driver behavior or similar options for a driver that is
+	   "default n". This allows you to provide sane defaults.
+
+	d) Hardware or infrastructure that everybody expects, such as CONFIG_NET
+	   or CONFIG_BLOCK. These are rare exceptions.
+
+- type definition + default value::
+
+	"def_bool"/"def_tristate" <expr> ["if" <expr>]
+
+  This is a shorthand notation for a type definition plus a value.
+  Optionally dependencies for this default value can be added with "if".
+
+- dependencies: "depends on" <expr>
+
+  This defines a dependency for this menu entry. If multiple
+  dependencies are defined, they are connected with '&&'. Dependencies
+  are applied to all other options within this menu entry (which also
+  accept an "if" expression), so these two examples are equivalent::
+
+	bool "foo" if BAR
+	default y if BAR
+
+  and::
+
+	depends on BAR
+	bool "foo"
+	default y
+
+- reverse dependencies: "select" <symbol> ["if" <expr>]
+
+  While normal dependencies reduce the upper limit of a symbol (see
+  below), reverse dependencies can be used to force a lower limit of
+  another symbol. The value of the current menu symbol is used as the
+  minimal value <symbol> can be set to. If <symbol> is selected multiple
+  times, the limit is set to the largest selection.
+  Reverse dependencies can only be used with boolean or tristate
+  symbols.
+
+  Note:
+	select should be used with care. select will force
+	a symbol to a value without visiting the dependencies.
+	By abusing select you are able to select a symbol FOO even
+	if FOO depends on BAR that is not set.
+	In general use select only for non-visible symbols
+	(no prompts anywhere) and for symbols with no dependencies.
+	That will limit the usefulness but on the other hand avoid
+	the illegal configurations all over.
+
+- weak reverse dependencies: "imply" <symbol> ["if" <expr>]
+
+  This is similar to "select" as it enforces a lower limit on another
+  symbol except that the "implied" symbol's value may still be set to n
+  from a direct dependency or with a visible prompt.
+
+  Given the following example::
+
+    config FOO
+	tristate
+	imply BAZ
+
+    config BAZ
+	tristate
+	depends on BAR
+
+  The following values are possible:
+
+	===		===		=============	==============
+	FOO		BAR		BAZ's default	choice for BAZ
+	===		===		=============	==============
+	n		y		n		N/m/y
+	m		y		m		M/y/n
+	y		y		y		Y/n
+	y		n		*		N
+	===		===		=============	==============
+
+  This is useful e.g. with multiple drivers that want to indicate their
+  ability to hook into a secondary subsystem while allowing the user to
+  configure that subsystem out without also having to unset these drivers.
+
+- limiting menu display: "visible if" <expr>
+
+  This attribute is only applicable to menu blocks, if the condition is
+  false, the menu block is not displayed to the user (the symbols
+  contained there can still be selected by other symbols, though). It is
+  similar to a conditional "prompt" attribute for individual menu
+  entries. Default value of "visible" is true.
+
+- numerical ranges: "range" <symbol> <symbol> ["if" <expr>]
+
+  This allows to limit the range of possible input values for int
+  and hex symbols. The user can only input a value which is larger than
+  or equal to the first symbol and smaller than or equal to the second
+  symbol.
+
+- help text: "help" or "---help---"
+
+  This defines a help text. The end of the help text is determined by
+  the indentation level, this means it ends at the first line which has
+  a smaller indentation than the first line of the help text.
+  "---help---" and "help" do not differ in behaviour, "---help---" is
+  used to help visually separate configuration logic from help within
+  the file as an aid to developers.
+
+- misc options: "option" <symbol>[=<value>]
+
+  Various less common options can be defined via this option syntax,
+  which can modify the behaviour of the menu entry and its config
+  symbol. These options are currently possible:
+
+  - "defconfig_list"
+    This declares a list of default entries which can be used when
+    looking for the default configuration (which is used when the main
+    .config doesn't exists yet.)
+
+  - "modules"
+    This declares the symbol to be used as the MODULES symbol, which
+    enables the third modular state for all config symbols.
+    At most one symbol may have the "modules" option set.
+
+  - "allnoconfig_y"
+    This declares the symbol as one that should have the value y when
+    using "allnoconfig". Used for symbols that hide other symbols.
+
+Menu dependencies
+-----------------
+
+Dependencies define the visibility of a menu entry and can also reduce
+the input range of tristate symbols. The tristate logic used in the
+expressions uses one more state than normal boolean logic to express the
+module state. Dependency expressions have the following syntax::
+
+  <expr> ::= <symbol>                           (1)
+           <symbol> '=' <symbol>                (2)
+           <symbol> '!=' <symbol>               (3)
+           <symbol1> '<' <symbol2>              (4)
+           <symbol1> '>' <symbol2>              (4)
+           <symbol1> '<=' <symbol2>             (4)
+           <symbol1> '>=' <symbol2>             (4)
+           '(' <expr> ')'                       (5)
+           '!' <expr>                           (6)
+           <expr> '&&' <expr>                   (7)
+           <expr> '||' <expr>                   (8)
+
+Expressions are listed in decreasing order of precedence.
+
+(1) Convert the symbol into an expression. Boolean and tristate symbols
+    are simply converted into the respective expression values. All
+    other symbol types result in 'n'.
+(2) If the values of both symbols are equal, it returns 'y',
+    otherwise 'n'.
+(3) If the values of both symbols are equal, it returns 'n',
+    otherwise 'y'.
+(4) If value of <symbol1> is respectively lower, greater, lower-or-equal,
+    or greater-or-equal than value of <symbol2>, it returns 'y',
+    otherwise 'n'.
+(5) Returns the value of the expression. Used to override precedence.
+(6) Returns the result of (2-/expr/).
+(7) Returns the result of min(/expr/, /expr/).
+(8) Returns the result of max(/expr/, /expr/).
+
+An expression can have a value of 'n', 'm' or 'y' (or 0, 1, 2
+respectively for calculations). A menu entry becomes visible when its
+expression evaluates to 'm' or 'y'.
+
+There are two types of symbols: constant and non-constant symbols.
+Non-constant symbols are the most common ones and are defined with the
+'config' statement. Non-constant symbols consist entirely of alphanumeric
+characters or underscores.
+Constant symbols are only part of expressions. Constant symbols are
+always surrounded by single or double quotes. Within the quote, any
+other character is allowed and the quotes can be escaped using '\'.
+
+Menu structure
+--------------
+
+The position of a menu entry in the tree is determined in two ways. First
+it can be specified explicitly::
+
+  menu "Network device support"
+	depends on NET
+
+  config NETDEVICES
+	...
+
+  endmenu
+
+All entries within the "menu" ... "endmenu" block become a submenu of
+"Network device support". All subentries inherit the dependencies from
+the menu entry, e.g. this means the dependency "NET" is added to the
+dependency list of the config option NETDEVICES.
+
+The other way to generate the menu structure is done by analyzing the
+dependencies. If a menu entry somehow depends on the previous entry, it
+can be made a submenu of it. First, the previous (parent) symbol must
+be part of the dependency list and then one of these two conditions
+must be true:
+
+- the child entry must become invisible, if the parent is set to 'n'
+- the child entry must only be visible, if the parent is visible::
+
+    config MODULES
+	bool "Enable loadable module support"
+
+    config MODVERSIONS
+	bool "Set version information on all module symbols"
+	depends on MODULES
+
+    comment "module support disabled"
+	depends on !MODULES
+
+MODVERSIONS directly depends on MODULES, this means it's only visible if
+MODULES is different from 'n'. The comment on the other hand is only
+visible when MODULES is set to 'n'.
+
+
+Kconfig syntax
+--------------
+
+The configuration file describes a series of menu entries, where every
+line starts with a keyword (except help texts). The following keywords
+end a menu entry:
+
+- config
+- menuconfig
+- choice/endchoice
+- comment
+- menu/endmenu
+- if/endif
+- source
+
+The first five also start the definition of a menu entry.
+
+config::
+
+	"config" <symbol>
+	<config options>
+
+This defines a config symbol <symbol> and accepts any of above
+attributes as options.
+
+menuconfig::
+
+	"menuconfig" <symbol>
+	<config options>
+
+This is similar to the simple config entry above, but it also gives a
+hint to front ends, that all suboptions should be displayed as a
+separate list of options. To make sure all the suboptions will really
+show up under the menuconfig entry and not outside of it, every item
+from the <config options> list must depend on the menuconfig symbol.
+In practice, this is achieved by using one of the next two constructs::
+
+  (1):
+  menuconfig M
+  if M
+      config C1
+      config C2
+  endif
+
+  (2):
+  menuconfig M
+  config C1
+      depends on M
+  config C2
+      depends on M
+
+In the following examples (3) and (4), C1 and C2 still have the M
+dependency, but will not appear under menuconfig M anymore, because
+of C0, which doesn't depend on M::
+
+  (3):
+  menuconfig M
+      config C0
+  if M
+      config C1
+      config C2
+  endif
+
+  (4):
+  menuconfig M
+  config C0
+  config C1
+      depends on M
+  config C2
+      depends on M
+
+choices::
+
+	"choice" [symbol]
+	<choice options>
+	<choice block>
+	"endchoice"
+
+This defines a choice group and accepts any of the above attributes as
+options. A choice can only be of type bool or tristate.  If no type is
+specified for a choice, its type will be determined by the type of
+the first choice element in the group or remain unknown if none of the
+choice elements have a type specified, as well.
+
+While a boolean choice only allows a single config entry to be
+selected, a tristate choice also allows any number of config entries
+to be set to 'm'. This can be used if multiple drivers for a single
+hardware exists and only a single driver can be compiled/loaded into
+the kernel, but all drivers can be compiled as modules.
+
+A choice accepts another option "optional", which allows to set the
+choice to 'n' and no entry needs to be selected.
+If no [symbol] is associated with a choice, then you can not have multiple
+definitions of that choice. If a [symbol] is associated to the choice,
+then you may define the same choice (i.e. with the same entries) in another
+place.
+
+comment::
+
+	"comment" <prompt>
+	<comment options>
+
+This defines a comment which is displayed to the user during the
+configuration process and is also echoed to the output files. The only
+possible options are dependencies.
+
+menu::
+
+	"menu" <prompt>
+	<menu options>
+	<menu block>
+	"endmenu"
+
+This defines a menu block, see "Menu structure" above for more
+information. The only possible options are dependencies and "visible"
+attributes.
+
+if::
+
+	"if" <expr>
+	<if block>
+	"endif"
+
+This defines an if block. The dependency expression <expr> is appended
+to all enclosed menu entries.
+
+source::
+
+	"source" <prompt>
+
+This reads the specified configuration file. This file is always parsed.
+
+mainmenu::
+
+	"mainmenu" <prompt>
+
+This sets the config program's title bar if the config program chooses
+to use it. It should be placed at the top of the configuration, before any
+other statement.
+
+'#' Kconfig source file comment:
+
+An unquoted '#' character anywhere in a source file line indicates
+the beginning of a source file comment.  The remainder of that line
+is a comment.
+
+
+Kconfig hints
+-------------
+This is a collection of Kconfig tips, most of which aren't obvious at
+first glance and most of which have become idioms in several Kconfig
+files.
+
+Adding common features and make the usage configurable
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+It is a common idiom to implement a feature/functionality that are
+relevant for some architectures but not all.
+The recommended way to do so is to use a config variable named HAVE_*
+that is defined in a common Kconfig file and selected by the relevant
+architectures.
+An example is the generic IOMAP functionality.
+
+We would in lib/Kconfig see::
+
+  # Generic IOMAP is used to ...
+  config HAVE_GENERIC_IOMAP
+
+  config GENERIC_IOMAP
+	depends on HAVE_GENERIC_IOMAP && FOO
+
+And in lib/Makefile we would see::
+
+	obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
+
+For each architecture using the generic IOMAP functionality we would see::
+
+  config X86
+	select ...
+	select HAVE_GENERIC_IOMAP
+	select ...
+
+Note: we use the existing config option and avoid creating a new
+config variable to select HAVE_GENERIC_IOMAP.
+
+Note: the use of the internal config variable HAVE_GENERIC_IOMAP, it is
+introduced to overcome the limitation of select which will force a
+config option to 'y' no matter the dependencies.
+The dependencies are moved to the symbol GENERIC_IOMAP and we avoid the
+situation where select forces a symbol equals to 'y'.
+
+Adding features that need compiler support
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+There are several features that need compiler support. The recommended way
+to describe the dependency on the compiler feature is to use "depends on"
+followed by a test macro::
+
+  config STACKPROTECTOR
+	bool "Stack Protector buffer overflow detection"
+	depends on $(cc-option,-fstack-protector)
+	...
+
+If you need to expose a compiler capability to makefiles and/or C source files,
+`CC_HAS_` is the recommended prefix for the config option::
+
+  config CC_HAS_STACKPROTECTOR_NONE
+	def_bool $(cc-option,-fno-stack-protector)
+
+Build as module only
+~~~~~~~~~~~~~~~~~~~~
+To restrict a component build to module-only, qualify its config symbol
+with "depends on m".  E.g.::
+
+  config FOO
+	depends on BAR && m
+
+limits FOO to module (=m) or disabled (=n).
+
+Kconfig recursive dependency limitations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you've hit the Kconfig error: "recursive dependency detected" you've run
+into a recursive dependency issue with Kconfig, a recursive dependency can be
+summarized as a circular dependency. The kconfig tools need to ensure that
+Kconfig files comply with specified configuration requirements. In order to do
+that kconfig must determine the values that are possible for all Kconfig
+symbols, this is currently not possible if there is a circular relation
+between two or more Kconfig symbols. For more details refer to the "Simple
+Kconfig recursive issue" subsection below. Kconfig does not do recursive
+dependency resolution; this has a few implications for Kconfig file writers.
+We'll first explain why this issues exists and then provide an example
+technical limitation which this brings upon Kconfig developers. Eager
+developers wishing to try to address this limitation should read the next
+subsections.
+
+Simple Kconfig recursive issue
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Read: Documentation/kbuild/Kconfig.recursion-issue-01
+
+Test with::
+
+  make KBUILD_KCONFIG=Documentation/kbuild/Kconfig.recursion-issue-01 allnoconfig
+
+Cumulative Kconfig recursive issue
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Read: Documentation/kbuild/Kconfig.recursion-issue-02
+
+Test with::
+
+  make KBUILD_KCONFIG=Documentation/kbuild/Kconfig.recursion-issue-02 allnoconfig
+
+Practical solutions to kconfig recursive issue
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Developers who run into the recursive Kconfig issue have two options
+at their disposal. We document them below and also provide a list of
+historical issues resolved through these different solutions.
+
+  a) Remove any superfluous "select FOO" or "depends on FOO"
+  b) Match dependency semantics:
+
+	b1) Swap all "select FOO" to "depends on FOO" or,
+
+	b2) Swap all "depends on FOO" to "select FOO"
+
+The resolution to a) can be tested with the sample Kconfig file
+Documentation/kbuild/Kconfig.recursion-issue-01 through the removal
+of the "select CORE" from CORE_BELL_A_ADVANCED as that is implicit already
+since CORE_BELL_A depends on CORE. At times it may not be possible to remove
+some dependency criteria, for such cases you can work with solution b).
+
+The two different resolutions for b) can be tested in the sample Kconfig file
+Documentation/kbuild/Kconfig.recursion-issue-02.
+
+Below is a list of examples of prior fixes for these types of recursive issues;
+all errors appear to involve one or more select's and one or more "depends on".
+
+============    ===================================
+commit          fix
+============    ===================================
+06b718c01208    select A -> depends on A
+c22eacfe82f9    depends on A -> depends on B
+6a91e854442c    select A -> depends on A
+118c565a8f2e    select A -> select B
+f004e5594705    select A -> depends on A
+c7861f37b4c6    depends on A -> (null)
+80c69915e5fb    select A -> (null)              (1)
+c2218e26c0d0    select A -> depends on A        (1)
+d6ae99d04e1c    select A -> depends on A
+95ca19cf8cbf    select A -> depends on A
+8f057d7bca54    depends on A -> (null)
+8f057d7bca54    depends on A -> select A
+a0701f04846e    select A -> depends on A
+0c8b92f7f259    depends on A -> (null)
+e4e9e0540928    select A -> depends on A        (2)
+7453ea886e87    depends on A > (null)           (1)
+7b1fff7e4fdf    select A -> depends on A
+86c747d2a4f0    select A -> depends on A
+d9f9ab51e55e    select A -> depends on A
+0c51a4d8abd6    depends on A -> select A        (3)
+e98062ed6dc4    select A -> depends on A        (3)
+91e5d284a7f1    select A -> (null)
+============    ===================================
+
+(1) Partial (or no) quote of error.
+(2) That seems to be the gist of that fix.
+(3) Same error.
+
+Future kconfig work
+~~~~~~~~~~~~~~~~~~~
+
+Work on kconfig is welcomed on both areas of clarifying semantics and on
+evaluating the use of a full SAT solver for it. A full SAT solver can be
+desirable to enable more complex dependency mappings and / or queries,
+for instance on possible use case for a SAT solver could be that of handling
+the current known recursive dependency issues. It is not known if this would
+address such issues but such evaluation is desirable. If support for a full SAT
+solver proves too complex or that it cannot address recursive dependency issues
+Kconfig should have at least clear and well defined semantics which also
+addresses and documents limitations or requirements such as the ones dealing
+with recursive dependencies.
+
+Further work on both of these areas is welcomed on Kconfig. We elaborate
+on both of these in the next two subsections.
+
+Semantics of Kconfig
+~~~~~~~~~~~~~~~~~~~~
+
+The use of Kconfig is broad, Linux is now only one of Kconfig's users:
+one study has completed a broad analysis of Kconfig use in 12 projects [0]_.
+Despite its widespread use, and although this document does a reasonable job
+in documenting basic Kconfig syntax a more precise definition of Kconfig
+semantics is welcomed. One project deduced Kconfig semantics through
+the use of the xconfig configurator [1]_. Work should be done to confirm if
+the deduced semantics matches our intended Kconfig design goals.
+
+Having well defined semantics can be useful for tools for practical
+evaluation of depenencies, for instance one such use known case was work to
+express in boolean abstraction of the inferred semantics of Kconfig to
+translate Kconfig logic into boolean formulas and run a SAT solver on this to
+find dead code / features (always inactive), 114 dead features were found in
+Linux using this methodology [1]_ (Section 8: Threats to validity).
+
+Confirming this could prove useful as Kconfig stands as one of the the leading
+industrial variability modeling languages [1]_ [2]_. Its study would help
+evaluate practical uses of such languages, their use was only theoretical
+and real world requirements were not well understood. As it stands though
+only reverse engineering techniques have been used to deduce semantics from
+variability modeling languages such as Kconfig [3]_.
+
+.. [0] http://www.eng.uwaterloo.ca/~shshe/kconfig_semantics.pdf
+.. [1] http://gsd.uwaterloo.ca/sites/default/files/vm-2013-berger.pdf
+.. [2] http://gsd.uwaterloo.ca/sites/default/files/ase241-berger_0.pdf
+.. [3] http://gsd.uwaterloo.ca/sites/default/files/icse2011.pdf
+
+Full SAT solver for Kconfig
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Although SAT solvers [4]_ haven't yet been used by Kconfig directly, as noted
+in the previous subsection, work has been done however to express in boolean
+abstraction the inferred semantics of Kconfig to translate Kconfig logic into
+boolean formulas and run a SAT solver on it [5]_. Another known related project
+is CADOS [6]_ (former VAMOS [7]_) and the tools, mainly undertaker [8]_, which
+has been introduced first with [9]_.  The basic concept of undertaker is to
+exract variability models from Kconfig, and put them together with a
+propositional formula extracted from CPP #ifdefs and build-rules into a SAT
+solver in order to find dead code, dead files, and dead symbols. If using a SAT
+solver is desirable on Kconfig one approach would be to evaluate repurposing
+such efforts somehow on Kconfig. There is enough interest from mentors of
+existing projects to not only help advise how to integrate this work upstream
+but also help maintain it long term. Interested developers should visit:
+
+http://kernelnewbies.org/KernelProjects/kconfig-sat
+
+.. [4] http://www.cs.cornell.edu/~sabhar/chapters/SATSolvers-KR-Handbook.pdf
+.. [5] http://gsd.uwaterloo.ca/sites/default/files/vm-2013-berger.pdf
+.. [6] https://cados.cs.fau.de
+.. [7] https://vamos.cs.fau.de
+.. [8] https://undertaker.cs.fau.de
+.. [9] https://www4.cs.fau.de/Publications/2011/tartler_11_eurosys.pdf
diff --git a/docs/misc/kconfig-language.txt b/docs/misc/kconfig-language.txt
deleted file mode 100644
index 350f733bf2c7..000000000000
--- a/docs/misc/kconfig-language.txt
+++ /dev/null
@@ -1,395 +0,0 @@ 
-Introduction
-------------
-
-The configuration database is a collection of configuration options
-organized in a tree structure:
-
-	+- Code maturity level options
-	|  +- Prompt for development and/or incomplete code/drivers
-	+- General setup
-	|  +- Networking support
-	|  +- System V IPC
-	|  +- BSD Process Accounting
-	|  +- Sysctl support
-	+- Loadable module support
-	|  +- Enable loadable module support
-	|     +- Set version information on all module symbols
-	|     +- Kernel module loader
-	+- ...
-
-Every entry has its own dependencies. These dependencies are used
-to determine the visibility of an entry. Any child entry is only
-visible if its parent entry is also visible.
-
-Menu entries
-------------
-
-Most entries define a config option; all other entries help to organize
-them. A single configuration option is defined like this:
-
-config MODVERSIONS
-	bool "Set version information on all module symbols"
-	depends on MODULES
-	help
-	  Usually, modules have to be recompiled whenever you switch to a new
-	  kernel.  ...
-
-Every line starts with a key word and can be followed by multiple
-arguments.  "config" starts a new config entry. The following lines
-define attributes for this config option. Attributes can be the type of
-the config option, input prompt, dependencies, help text and default
-values. A config option can be defined multiple times with the same
-name, but every definition can have only a single input prompt and the
-type must not conflict.
-
-Menu attributes
----------------
-
-A menu entry can have a number of attributes. Not all of them are
-applicable everywhere (see syntax).
-
-- type definition: "bool"/"tristate"/"string"/"hex"/"int"
-  Every config option must have a type. There are only two basic types:
-  tristate and string; the other types are based on these two. The type
-  definition optionally accepts an input prompt, so these two examples
-  are equivalent:
-
-	bool "Networking support"
-  and
-	bool
-	prompt "Networking support"
-
-- input prompt: "prompt" <prompt> ["if" <expr>]
-  Every menu entry can have at most one prompt, which is used to display
-  to the user. Optionally dependencies only for this prompt can be added
-  with "if".
-
-- default value: "default" <expr> ["if" <expr>]
-  A config option can have any number of default values. If multiple
-  default values are visible, only the first defined one is active.
-  Default values are not limited to the menu entry where they are
-  defined. This means the default can be defined somewhere else or be
-  overridden by an earlier definition.
-  The default value is only assigned to the config symbol if no other
-  value was set by the user (via the input prompt above). If an input
-  prompt is visible the default value is presented to the user and can
-  be overridden by him.
-  Optionally, dependencies only for this default value can be added with
-  "if".
-
-- type definition + default value:
-	"def_bool"/"def_tristate" <expr> ["if" <expr>]
-  This is a shorthand notation for a type definition plus a value.
-  Optionally dependencies for this default value can be added with "if".
-
-- dependencies: "depends on" <expr>
-  This defines a dependency for this menu entry. If multiple
-  dependencies are defined, they are connected with '&&'. Dependencies
-  are applied to all other options within this menu entry (which also
-  accept an "if" expression), so these two examples are equivalent:
-
-	bool "foo" if BAR
-	default y if BAR
-  and
-	depends on BAR
-	bool "foo"
-	default y
-
-- reverse dependencies: "select" <symbol> ["if" <expr>]
-  While normal dependencies reduce the upper limit of a symbol (see
-  below), reverse dependencies can be used to force a lower limit of
-  another symbol. The value of the current menu symbol is used as the
-  minimal value <symbol> can be set to. If <symbol> is selected multiple
-  times, the limit is set to the largest selection.
-  Reverse dependencies can only be used with boolean or tristate
-  symbols.
-  Note:
-	select should be used with care. select will force
-	a symbol to a value without visiting the dependencies.
-	By abusing select you are able to select a symbol FOO even
-	if FOO depends on BAR that is not set.
-	In general use select only for non-visible symbols
-	(no prompts anywhere) and for symbols with no dependencies.
-	That will limit the usefulness but on the other hand avoid
-	the illegal configurations all over.
-
-- limiting menu display: "visible if" <expr>
-  This attribute is only applicable to menu blocks, if the condition is
-  false, the menu block is not displayed to the user (the symbols
-  contained there can still be selected by other symbols, though). It is
-  similar to a conditional "prompt" attribute for individual menu
-  entries. Default value of "visible" is true.
-
-- numerical ranges: "range" <symbol> <symbol> ["if" <expr>]
-  This allows to limit the range of possible input values for int
-  and hex symbols. The user can only input a value which is larger than
-  or equal to the first symbol and smaller than or equal to the second
-  symbol.
-
-- help text: "help" or "---help---"
-  This defines a help text. The end of the help text is determined by
-  the indentation level, this means it ends at the first line which has
-  a smaller indentation than the first line of the help text.
-  "---help---" and "help" do not differ in behaviour, "---help---" is
-  used to help visually separate configuration logic from help within
-  the file as an aid to developers.
-
-- misc options: "option" <symbol>[=<value>]
-  Various less common options can be defined via this option syntax,
-  which can modify the behaviour of the menu entry and its config
-  symbol. These options are currently possible:
-
-  - "defconfig_list"
-    This declares a list of default entries which can be used when
-    looking for the default configuration (which is used when the main
-    .config doesn't exists yet.)
-
-  - "modules"
-    This declares the symbol to be used as the MODULES symbol, which
-    enables the third modular state for all config symbols.
-    At most one symbol may have the "modules" option set.
-
-  - "env"=<value>
-    This imports the environment variable into Kconfig. It behaves like
-    a default, except that the value comes from the environment, this
-    also means that the behaviour when mixing it with normal defaults is
-    undefined at this point. The symbol is currently not exported back
-    to the build environment (if this is desired, it can be done via
-    another symbol).
-
-  - "allnoconfig_y"
-    This declares the symbol as one that should have the value y when
-    using "allnoconfig". Used for symbols that hide other symbols.
-
-Menu dependencies
------------------
-
-Dependencies define the visibility of a menu entry and can also reduce
-the input range of tristate symbols. The tristate logic used in the
-expressions uses one more state than normal boolean logic to express the
-module state. Dependency expressions have the following syntax:
-
-<expr> ::= <symbol>                             (1)
-           <symbol> '=' <symbol>                (2)
-           <symbol> '!=' <symbol>               (3)
-           '(' <expr> ')'                       (4)
-           '!' <expr>                           (5)
-           <expr> '&&' <expr>                   (6)
-           <expr> '||' <expr>                   (7)
-
-Expressions are listed in decreasing order of precedence. 
-
-(1) Convert the symbol into an expression. Boolean and tristate symbols
-    are simply converted into the respective expression values. All
-    other symbol types result in 'n'.
-(2) If the values of both symbols are equal, it returns 'y',
-    otherwise 'n'.
-(3) If the values of both symbols are equal, it returns 'n',
-    otherwise 'y'.
-(4) Returns the value of the expression. Used to override precedence.
-(5) Returns the result of (2-/expr/).
-(6) Returns the result of min(/expr/, /expr/).
-(7) Returns the result of max(/expr/, /expr/).
-
-An expression can have a value of 'n', 'm' or 'y' (or 0, 1, 2
-respectively for calculations). A menu entry becomes visible when its
-expression evaluates to 'm' or 'y'.
-
-There are two types of symbols: constant and non-constant symbols.
-Non-constant symbols are the most common ones and are defined with the
-'config' statement. Non-constant symbols consist entirely of alphanumeric
-characters or underscores.
-Constant symbols are only part of expressions. Constant symbols are
-always surrounded by single or double quotes. Within the quote, any
-other character is allowed and the quotes can be escaped using '\'.
-
-Menu structure
---------------
-
-The position of a menu entry in the tree is determined in two ways. First
-it can be specified explicitly:
-
-menu "Network device support"
-	depends on NET
-
-config NETDEVICES
-	...
-
-endmenu
-
-All entries within the "menu" ... "endmenu" block become a submenu of
-"Network device support". All subentries inherit the dependencies from
-the menu entry, e.g. this means the dependency "NET" is added to the
-dependency list of the config option NETDEVICES.
-
-The other way to generate the menu structure is done by analyzing the
-dependencies. If a menu entry somehow depends on the previous entry, it
-can be made a submenu of it. First, the previous (parent) symbol must
-be part of the dependency list and then one of these two conditions
-must be true:
-- the child entry must become invisible, if the parent is set to 'n'
-- the child entry must only be visible, if the parent is visible
-
-config MODULES
-	bool "Enable loadable module support"
-
-config MODVERSIONS
-	bool "Set version information on all module symbols"
-	depends on MODULES
-
-comment "module support disabled"
-	depends on !MODULES
-
-MODVERSIONS directly depends on MODULES, this means it's only visible if
-MODULES is different from 'n'. The comment on the other hand is always
-visible when MODULES is visible (the (empty) dependency of MODULES is
-also part of the comment dependencies).
-
-
-Kconfig syntax
---------------
-
-The configuration file describes a series of menu entries, where every
-line starts with a keyword (except help texts). The following keywords
-end a menu entry:
-- config
-- menuconfig
-- choice/endchoice
-- comment
-- menu/endmenu
-- if/endif
-- source
-The first five also start the definition of a menu entry.
-
-config:
-
-	"config" <symbol>
-	<config options>
-
-This defines a config symbol <symbol> and accepts any of above
-attributes as options.
-
-menuconfig:
-	"menuconfig" <symbol>
-	<config options>
-
-This is similar to the simple config entry above, but it also gives a
-hint to front ends, that all suboptions should be displayed as a
-separate list of options.
-
-choices:
-
-	"choice" [symbol]
-	<choice options>
-	<choice block>
-	"endchoice"
-
-This defines a choice group and accepts any of the above attributes as
-options. A choice can only be of type bool or tristate, while a boolean
-choice only allows a single config entry to be selected, a tristate
-choice also allows any number of config entries to be set to 'm'. This
-can be used if multiple drivers for a single hardware exists and only a
-single driver can be compiled/loaded into the kernel, but all drivers
-can be compiled as modules.
-A choice accepts another option "optional", which allows to set the
-choice to 'n' and no entry needs to be selected.
-If no [symbol] is associated with a choice, then you can not have multiple
-definitions of that choice. If a [symbol] is associated to the choice,
-then you may define the same choice (ie. with the same entries) in another
-place.
-
-comment:
-
-	"comment" <prompt>
-	<comment options>
-
-This defines a comment which is displayed to the user during the
-configuration process and is also echoed to the output files. The only
-possible options are dependencies.
-
-menu:
-
-	"menu" <prompt>
-	<menu options>
-	<menu block>
-	"endmenu"
-
-This defines a menu block, see "Menu structure" above for more
-information. The only possible options are dependencies and "visible"
-attributes.
-
-if:
-
-	"if" <expr>
-	<if block>
-	"endif"
-
-This defines an if block. The dependency expression <expr> is appended
-to all enclosed menu entries.
-
-source:
-
-	"source" <prompt>
-
-This reads the specified configuration file. This file is always parsed.
-
-mainmenu:
-
-	"mainmenu" <prompt>
-
-This sets the config program's title bar if the config program chooses
-to use it. It should be placed at the top of the configuration, before any
-other statement.
-
-
-Kconfig hints
--------------
-This is a collection of Kconfig tips, most of which aren't obvious at
-first glance and most of which have become idioms in several Kconfig
-files.
-
-Adding common features and make the usage configurable
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-It is a common idiom to implement a feature/functionality that are
-relevant for some architectures but not all.
-The recommended way to do so is to use a config variable named HAVE_*
-that is defined in a common Kconfig file and selected by the relevant
-architectures.
-An example is the generic IOMAP functionality.
-
-We would in lib/Kconfig see:
-
-# Generic IOMAP is used to ...
-config HAVE_GENERIC_IOMAP
-
-config GENERIC_IOMAP
-	depends on HAVE_GENERIC_IOMAP && FOO
-
-And in lib/Makefile we would see:
-obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
-
-For each architecture using the generic IOMAP functionality we would see:
-
-config X86
-	select ...
-	select HAVE_GENERIC_IOMAP
-	select ...
-
-Note: we use the existing config option and avoid creating a new
-config variable to select HAVE_GENERIC_IOMAP.
-
-Note: the use of the internal config variable HAVE_GENERIC_IOMAP, it is
-introduced to overcome the limitation of select which will force a
-config option to 'y' no matter the dependencies.
-The dependencies are moved to the symbol GENERIC_IOMAP and we avoid the
-situation where select forces a symbol equals to 'y'.
-
-Build as module only
-~~~~~~~~~~~~~~~~~~~~
-To restrict a component build to module-only, qualify its config symbol
-with "depends on m".  E.g.:
-
-config FOO
-	depends on BAR && m
-
-limits FOO to module (=m) or disabled (=n).
diff --git a/docs/misc/kconfig-macro-language.rst b/docs/misc/kconfig-macro-language.rst
new file mode 100644
index 000000000000..35b3263b7e40
--- /dev/null
+++ b/docs/misc/kconfig-macro-language.rst
@@ -0,0 +1,247 @@ 
+======================
+Kconfig macro language
+======================
+
+Concept
+-------
+
+The basic idea was inspired by Make. When we look at Make, we notice sort of
+two languages in one. One language describes dependency graphs consisting of
+targets and prerequisites. The other is a macro language for performing textual
+substitution.
+
+There is clear distinction between the two language stages. For example, you
+can write a makefile like follows::
+
+    APP := foo
+    SRC := foo.c
+    CC := gcc
+
+    $(APP): $(SRC)
+            $(CC) -o $(APP) $(SRC)
+
+The macro language replaces the variable references with their expanded form,
+and handles as if the source file were input like follows::
+
+    foo: foo.c
+            gcc -o foo foo.c
+
+Then, Make analyzes the dependency graph and determines the targets to be
+updated.
+
+The idea is quite similar in Kconfig - it is possible to describe a Kconfig
+file like this::
+
+    CC := gcc
+
+    config CC_HAS_FOO
+            def_bool $(shell, $(srctree)/scripts/gcc-check-foo.sh $(CC))
+
+The macro language in Kconfig processes the source file into the following
+intermediate::
+
+    config CC_HAS_FOO
+            def_bool y
+
+Then, Kconfig moves onto the evaluation stage to resolve inter-symbol
+dependency as explained in kconfig-language.txt.
+
+
+Variables
+---------
+
+Like in Make, a variable in Kconfig works as a macro variable.  A macro
+variable is expanded "in place" to yield a text string that may then be
+expanded further. To get the value of a variable, enclose the variable name in
+$( ). The parentheses are required even for single-letter variable names; $X is
+a syntax error. The curly brace form as in ${CC} is not supported either.
+
+There are two types of variables: simply expanded variables and recursively
+expanded variables.
+
+A simply expanded variable is defined using the := assignment operator. Its
+righthand side is expanded immediately upon reading the line from the Kconfig
+file.
+
+A recursively expanded variable is defined using the = assignment operator.
+Its righthand side is simply stored as the value of the variable without
+expanding it in any way. Instead, the expansion is performed when the variable
+is used.
+
+There is another type of assignment operator; += is used to append text to a
+variable. The righthand side of += is expanded immediately if the lefthand
+side was originally defined as a simple variable. Otherwise, its evaluation is
+deferred.
+
+The variable reference can take parameters, in the following form::
+
+  $(name,arg1,arg2,arg3)
+
+You can consider the parameterized reference as a function. (more precisely,
+"user-defined function" in contrast to "built-in function" listed below).
+
+Useful functions must be expanded when they are used since the same function is
+expanded differently if different parameters are passed. Hence, a user-defined
+function is defined using the = assignment operator. The parameters are
+referenced within the body definition with $(1), $(2), etc.
+
+In fact, recursively expanded variables and user-defined functions are the same
+internally. (In other words, "variable" is "function with zero argument".)
+When we say "variable" in a broad sense, it includes "user-defined function".
+
+
+Built-in functions
+------------------
+
+Like Make, Kconfig provides several built-in functions. Every function takes a
+particular number of arguments.
+
+In Make, every built-in function takes at least one argument. Kconfig allows
+zero argument for built-in functions, such as $(fileno), $(lineno). You could
+consider those as "built-in variable", but it is just a matter of how we call
+it after all. Let's say "built-in function" here to refer to natively supported
+functionality.
+
+Kconfig currently supports the following built-in functions.
+
+ - $(shell,command)
+
+  The "shell" function accepts a single argument that is expanded and passed
+  to a subshell for execution. The standard output of the command is then read
+  and returned as the value of the function. Every newline in the output is
+  replaced with a space. Any trailing newlines are deleted. The standard error
+  is not returned, nor is any program exit status.
+
+ - $(info,text)
+
+  The "info" function takes a single argument and prints it to stdout.
+  It evaluates to an empty string.
+
+ - $(warning-if,condition,text)
+
+  The "warning-if" function takes two arguments. If the condition part is "y",
+  the text part is sent to stderr. The text is prefixed with the name of the
+  current Kconfig file and the current line number.
+
+ - $(error-if,condition,text)
+
+  The "error-if" function is similar to "warning-if", but it terminates the
+  parsing immediately if the condition part is "y".
+
+ - $(filename)
+
+  The 'filename' takes no argument, and $(filename) is expanded to the file
+  name being parsed.
+
+ - $(lineno)
+
+  The 'lineno' takes no argument, and $(lineno) is expanded to the line number
+  being parsed.
+
+
+Make vs Kconfig
+---------------
+
+Kconfig adopts Make-like macro language, but the function call syntax is
+slightly different.
+
+A function call in Make looks like this::
+
+  $(func-name arg1,arg2,arg3)
+
+The function name and the first argument are separated by at least one
+whitespace. Then, leading whitespaces are trimmed from the first argument,
+while whitespaces in the other arguments are kept. You need to use a kind of
+trick to start the first parameter with spaces. For example, if you want
+to make "info" function print "  hello", you can write like follows::
+
+  empty :=
+  space := $(empty) $(empty)
+  $(info $(space)$(space)hello)
+
+Kconfig uses only commas for delimiters, and keeps all whitespaces in the
+function call. Some people prefer putting a space after each comma delimiter::
+
+  $(func-name, arg1, arg2, arg3)
+
+In this case, "func-name" will receive " arg1", " arg2", " arg3". The presence
+of leading spaces may matter depending on the function. The same applies to
+Make - for example, $(subst .c, .o, $(sources)) is a typical mistake; it
+replaces ".c" with " .o".
+
+In Make, a user-defined function is referenced by using a built-in function,
+'call', like this::
+
+    $(call my-func,arg1,arg2,arg3)
+
+Kconfig invokes user-defined functions and built-in functions in the same way.
+The omission of 'call' makes the syntax shorter.
+
+In Make, some functions treat commas verbatim instead of argument separators.
+For example, $(shell echo hello, world) runs the command "echo hello, world".
+Likewise, $(info hello, world) prints "hello, world" to stdout. You could say
+this is _useful_ inconsistency.
+
+In Kconfig, for simpler implementation and grammatical consistency, commas that
+appear in the $( ) context are always delimiters. It means::
+
+  $(shell, echo hello, world)
+
+is an error because it is passing two parameters where the 'shell' function
+accepts only one. To pass commas in arguments, you can use the following trick::
+
+  comma := ,
+  $(shell, echo hello$(comma) world)
+
+
+Caveats
+-------
+
+A variable (or function) cannot be expanded across tokens. So, you cannot use
+a variable as a shorthand for an expression that consists of multiple tokens.
+The following works::
+
+    RANGE_MIN := 1
+    RANGE_MAX := 3
+
+    config FOO
+            int "foo"
+            range $(RANGE_MIN) $(RANGE_MAX)
+
+But, the following does not work::
+
+    RANGES := 1 3
+
+    config FOO
+            int "foo"
+            range $(RANGES)
+
+A variable cannot be expanded to any keyword in Kconfig.  The following does
+not work::
+
+    MY_TYPE := tristate
+
+    config FOO
+            $(MY_TYPE) "foo"
+            default y
+
+Obviously from the design, $(shell command) is expanded in the textual
+substitution phase. You cannot pass symbols to the 'shell' function.
+
+The following does not work as expected::
+
+    config ENDIAN_FLAG
+            string
+            default "-mbig-endian" if CPU_BIG_ENDIAN
+            default "-mlittle-endian" if CPU_LITTLE_ENDIAN
+
+    config CC_HAS_ENDIAN_FLAG
+            def_bool $(shell $(srctree)/scripts/gcc-check-flag ENDIAN_FLAG)
+
+Instead, you can do like follows so that any function call is statically
+expanded::
+
+    config CC_HAS_ENDIAN_FLAG
+            bool
+            default $(shell $(srctree)/scripts/gcc-check-flag -mbig-endian) if CPU_BIG_ENDIAN
+            default $(shell $(srctree)/scripts/gcc-check-flag -mlittle-endian) if CPU_LITTLE_ENDIAN
diff --git a/docs/misc/kconfig.txt b/docs/misc/kconfig.rst
similarity index 70%
rename from docs/misc/kconfig.txt
rename to docs/misc/kconfig.rst
index bbc99c0c1094..a9a855f894b3 100644
--- a/docs/misc/kconfig.txt
+++ b/docs/misc/kconfig.rst
@@ -1,14 +1,17 @@ 
-This file contains some assistance for using "make *config".
+===================
+Kconfig make config
+===================
+
+This file contains some assistance for using `make *config`.
 
 Use "make help" to list all of the possible configuration targets.
 
-The xconfig ('qconf') and menuconfig ('mconf') programs also
-have embedded help text.  Be sure to check it for navigation,
-search, and other general help text.
+The xconfig ('qconf'), menuconfig ('mconf'), and nconfig ('nconf')
+programs also have embedded help text.  Be sure to check that for
+navigation, search, and other general help text.
 
-======================================================================
 General
---------------------------------------------------
+-------
 
 New kernel releases often introduce new config symbols.  Often more
 important, new kernel releases may rename config symbols.  When
@@ -17,48 +20,55 @@  this happens, using a previously working .config file and running
 for you, so you may find that you need to see what NEW kernel
 symbols have been introduced.
 
-To see a list of new config symbols when using "make oldconfig", use
+To see a list of new config symbols, use::
 
 	cp user/some/old.config .config
 	make listnewconfig
 
 and the config program will list any new symbols, one per line.
 
+Alternatively, you can use the brute force method::
+
+	make oldconfig
 	scripts/diffconfig .config.old .config | less
 
-______________________________________________________________________
-Environment variables for '*config'
+----------------------------------------------------------------------
+
+Environment variables for `*config`
 
 KCONFIG_CONFIG
---------------------------------------------------
+--------------
 This environment variable can be used to specify a default kernel config
 file name to override the default name of ".config".
 
 KCONFIG_OVERWRITECONFIG
---------------------------------------------------
+-----------------------
 If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not
 break symlinks when .config is a symlink to somewhere else.
 
-CONFIG_
---------------------------------------------------
-If you set CONFIG_ in the environment, Kconfig will prefix all symbols
+`CONFIG_`
+---------
+If you set `CONFIG_` in the environment, Kconfig will prefix all symbols
 with its value when saving the configuration, instead of using the default,
-"CONFIG_".
+`CONFIG_`.
+
+----------------------------------------------------------------------
 
-______________________________________________________________________
 Environment variables for '{allyes/allmod/allno/rand}config'
 
 KCONFIG_ALLCONFIG
---------------------------------------------------
+-----------------
 (partially based on lkml email from/by Rob Landley, re: miniconfig)
+
 --------------------------------------------------
+
 The allyesconfig/allmodconfig/allnoconfig/randconfig variants can also
 use the environment variable KCONFIG_ALLCONFIG as a flag or a filename
 that contains config symbols that the user requires to be set to a
 specific value.  If KCONFIG_ALLCONFIG is used without a filename where
-KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", "make *config"
+KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", `make *config`
 checks for a file named "all{yes/mod/no/def/random}.config"
-(corresponding to the *config command that was used) for symbol values
+(corresponding to the `*config` command that was used) for symbol values
 that are to be forced.  If this file is not found, it checks for a
 file named "all.config" to contain forced values.
 
@@ -71,43 +81,55 @@  This 'KCONFIG_ALLCONFIG' file is a config file which contains
 (usually a subset of all) preset config symbols.  These variable
 settings are still subject to normal dependency checks.
 
-Examples:
+Examples::
+
 	KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig
-or
+
+or::
+
 	KCONFIG_ALLCONFIG=mini.config make allnoconfig
-or
+
+or::
+
 	make KCONFIG_ALLCONFIG=mini.config allnoconfig
 
 These examples will disable most options (allnoconfig) but enable or
 disable the options that are explicitly listed in the specified
 mini-config files.
 
-______________________________________________________________________
+----------------------------------------------------------------------
+
 Environment variables for 'randconfig'
 
 KCONFIG_SEED
---------------------------------------------------
+------------
 You can set this to the integer value used to seed the RNG, if you want
 to somehow debug the behaviour of the kconfig parser/frontends.
 If not set, the current time will be used.
 
 KCONFIG_PROBABILITY
---------------------------------------------------
+-------------------
 This variable can be used to skew the probabilities. This variable can
 be unset or empty, or set to three different formats:
+
+    =======================     ==================  =====================
 	KCONFIG_PROBABILITY     y:n split           y:m:n split
-	-----------------------------------------------------------------
+    =======================     ==================  =====================
 	unset or empty          50  : 50            33  : 33  : 34
 	N                        N  : 100-N         N/2 : N/2 : 100-N
     [1] N:M                     N+M : 100-(N+M)      N  :  M  : 100-(N+M)
     [2] N:M:L                    N  : 100-N          M  :  L  : 100-(M+L)
+    =======================     ==================  =====================
 
 where N, M and L are integers (in base 10) in the range [0,100], and so
 that:
+
     [1] N+M is in the range [0,100]
+
     [2] M+L is in the range [0,100]
 
-Examples:
+Examples::
+
 	KCONFIG_PROBABILITY=10
 		10% of booleans will be set to 'y', 90% to 'n'
 		5% of tristates will be set to 'y', 5% to 'm', 90% to 'n'
@@ -118,34 +140,36 @@  Examples:
 		10% of booleans will be set to 'y', 90% to 'n'
 		15% of tristates will be set to 'y', 15% to 'm', 70% to 'n'
 
-______________________________________________________________________
-Environment variables for 'silentoldconfig'
+----------------------------------------------------------------------
+
+Environment variables for 'syncconfig'
 
 KCONFIG_NOSILENTUPDATE
---------------------------------------------------
+----------------------
 If this variable has a non-blank value, it prevents silent kernel
 config updates (requires explicit updates).
 
 KCONFIG_AUTOCONFIG
---------------------------------------------------
+------------------
 This environment variable can be set to specify the path & name of the
 "auto.conf" file.  Its default value is "include/config/auto.conf".
 
 KCONFIG_TRISTATE
---------------------------------------------------
+----------------
 This environment variable can be set to specify the path & name of the
 "tristate.conf" file.  Its default value is "include/config/tristate.conf".
 
 KCONFIG_AUTOHEADER
---------------------------------------------------
+------------------
 This environment variable can be set to specify the path & name of the
 "autoconf.h" (header) file.
 Its default value is "include/generated/autoconf.h".
 
 
-======================================================================
+----------------------------------------------------------------------
+
 menuconfig
---------------------------------------------------
+----------
 
 SEARCHING for CONFIG symbols
 
@@ -155,56 +179,98 @@  Searching in menuconfig:
 	names, so you have to know something close to what you are
 	looking for.
 
-	Example:
+	Example::
+
 		/hotplug
 		This lists all config symbols that contain "hotplug",
 		e.g., HOTPLUG_CPU, MEMORY_HOTPLUG.
 
-	For search help, enter / followed TAB-TAB-TAB (to highlight
+	For search help, enter / followed by TAB-TAB (to highlight
 	<Help>) and Enter.  This will tell you that you can also use
 	regular expressions (regexes) in the search string, so if you
-	are not interested in MEMORY_HOTPLUG, you could try
+	are not interested in MEMORY_HOTPLUG, you could try::
 
 		/^hotplug
 
 	When searching, symbols are sorted thus:
+
 	  - first, exact matches, sorted alphabetically (an exact match
 	    is when the search matches the complete symbol name);
 	  - then, other matches, sorted alphabetically.
+
 	For example: ^ATH.K matches:
+
 	    ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG
 	    [...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...]
+
 	of which only ATH5K and ATH9K match exactly and so are sorted
 	first (and in alphabetical order), then come all other symbols,
 	sorted in alphabetical order.
 
-______________________________________________________________________
+----------------------------------------------------------------------
+
 User interface options for 'menuconfig'
 
 MENUCONFIG_COLOR
---------------------------------------------------
+----------------
 It is possible to select different color themes using the variable
-MENUCONFIG_COLOR.  To select a theme use:
+MENUCONFIG_COLOR.  To select a theme use::
 
 	make MENUCONFIG_COLOR=<theme> menuconfig
 
-Available themes are:
-  mono       => selects colors suitable for monochrome displays
-  blackbg    => selects a color scheme with black background
-  classic    => theme with blue background. The classic look
-  bluetitle  => a LCD friendly version of classic. (default)
+Available themes are::
+
+  - mono       => selects colors suitable for monochrome displays
+  - blackbg    => selects a color scheme with black background
+  - classic    => theme with blue background. The classic look
+  - bluetitle  => a LCD friendly version of classic. (default)
 
 MENUCONFIG_MODE
---------------------------------------------------
+---------------
 This mode shows all sub-menus in one large tree.
 
-Example:
+Example::
+
 	make MENUCONFIG_MODE=single_menu menuconfig
 
+----------------------------------------------------------------------
+
+nconfig
+-------
+
+nconfig is an alternate text-based configurator.  It lists function
+keys across the bottom of the terminal (window) that execute commands.
+You can also just use the corresponding numeric key to execute the
+commands unless you are in a data entry window.  E.g., instead of F6
+for Save, you can just press 6.
+
+Use F1 for Global help or F3 for the Short help menu.
+
+Searching in nconfig:
+
+	You can search either in the menu entry "prompt" strings
+	or in the configuration symbols.
+
+	Use / to begin a search through the menu entries.  This does
+	not support regular expressions.  Use <Down> or <Up> for
+	Next hit and Previous hit, respectively.  Use <Esc> to
+	terminate the search mode.
+
+	F8 (SymSearch) searches the configuration symbols for the
+	given string or regular expression (regex).
+
+NCONFIG_MODE
+------------
+This mode shows all sub-menus in one large tree.
+
+Example::
+
+	make NCONFIG_MODE=single_menu nconfig
+
+----------------------------------------------------------------------
 
-======================================================================
 xconfig
---------------------------------------------------
+-------
 
 Searching in xconfig:
 
@@ -212,9 +278,12 @@  Searching in xconfig:
 	names, so you have to know something close to what you are
 	looking for.
 
-	Example:
+	Example::
+
 		Ctrl-F hotplug
-	or
+
+	or::
+
 		Menu: File, Search, hotplug
 
 	lists all config symbol entries that contain "hotplug" in
@@ -224,14 +293,12 @@  Searching in xconfig:
 	to return to the main menu.
 
 
-======================================================================
+----------------------------------------------------------------------
+
 gconfig
---------------------------------------------------
+-------
 
 Searching in gconfig:
 
-	None (gconfig isn't maintained as well as xconfig or menuconfig);
-	however, gconfig does have a few more viewing choices than
-	xconfig does.
-
-###
+	There is no search command in gconfig.  However, gconfig does
+	have several different viewing choices, modes, and options.
diff --git a/xen/.gitignore b/xen/.gitignore
new file mode 100644
index 000000000000..9fef41a09b47
--- /dev/null
+++ b/xen/.gitignore
@@ -0,0 +1,2 @@ 
+*.lex.c
+*.tab.[ch]
diff --git a/xen/Kconfig b/xen/Kconfig
index 4a207e4553aa..01067326b4e7 100644
--- a/xen/Kconfig
+++ b/xen/Kconfig
@@ -2,24 +2,12 @@ 
 # For a description of the syntax of this configuration file,
 # see docs/misc/kconfig-language.txt
 #
-mainmenu "Xen/$SRCARCH $XEN_FULLVERSION Configuration"
-
-config SRCARCH
-	string
-	option env="SRCARCH"
-
-config ARCH
-	string
-	option env="ARCH"
+mainmenu "Xen/$(SRCARCH) $(XEN_FULLVERSION) Configuration"
 
 config BROKEN
 	bool
 
-source "arch/$SRCARCH/Kconfig"
-
-config XEN_FULLVERSION
-	string
-	option env="XEN_FULLVERSION"
+source "arch/$(SRCARCH)/Kconfig"
 
 config DEFCONFIG_LIST
 	string
@@ -28,7 +16,7 @@  config DEFCONFIG_LIST
 
 config EXPERT
 	string
-	option env="XEN_CONFIG_EXPERT"
+	default y if "$(XEN_CONFIG_EXPERT)" = "y"
 
 config LTO
 	bool "Link Time Optimisation"
diff --git a/xen/Makefile b/xen/Makefile
index f36a5bc6c06e..efbe9605e52b 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -267,7 +267,7 @@  $(foreach base,arch/x86/mm/guest_walk_% \
                arch/x86/mm/shadow/guest_%, \
     $(foreach ext,o i s,$(call build-intermediate,$(base).$(ext))))
 
-kconfig := silentoldconfig oldconfig config menuconfig defconfig \
+kconfig := oldconfig config menuconfig defconfig \
 	nconfig xconfig gconfig savedefconfig listnewconfig olddefconfig \
 	randconfig $(notdir $(wildcard arch/$(SRCARCH)/configs/*_defconfig))
 .PHONY: $(kconfig)
@@ -275,7 +275,7 @@  $(kconfig):
 	$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) SRCARCH=$(SRCARCH) HOSTCC="$(HOSTCC)" HOSTCXX="$(HOSTCXX)" $@
 
 include/config/%.conf: include/config/auto.conf.cmd $(KCONFIG_CONFIG)
-	$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) SRCARCH=$(SRCARCH) HOSTCC="$(HOSTCC)" HOSTCXX="$(HOSTCXX)" silentoldconfig
+	$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) SRCARCH=$(SRCARCH) HOSTCC="$(HOSTCC)" HOSTCXX="$(HOSTCXX)" syncconfig
 
 # Allow people to just run `make` as before and not force them to configure
 $(KCONFIG_CONFIG):
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index a51aa7bfa8fc..d51f66072e2e 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -1,6 +1,6 @@ 
 config 64BIT
 	bool
-	default ARCH != "arm32"
+	default "$(ARCH)" != "arm32"
 	help
 	  Say yes to build a 64-bit Xen
 	  Say no to build a 32-bit Xen
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index 2f516da10128..4cf6be3c0556 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -72,14 +72,6 @@  config NEEDS_LIBELF
 config NEEDS_LIST_SORT
 	bool
 
-config HAS_BUILD_ID
-	string
-	option env="XEN_HAS_BUILD_ID"
-
-config HAS_CHECKPOLICY
-	string
-	option env="XEN_HAS_CHECKPOLICY"
-
 menu "Speculative hardening"
 
 config SPECULATIVE_HARDEN_ARRAY
@@ -198,7 +190,7 @@  config XSM_FLASK_AVC_STATS
 
 config XSM_FLASK_POLICY
 	bool "Compile Xen with a built-in FLASK security policy"
-	default y if HAS_CHECKPOLICY = "y"
+	default y if "$(XEN_HAS_CHECKPOLICY)" = "y"
 	depends on XSM_FLASK
 	---help---
 	  This includes a default XSM policy in the hypervisor so that the
@@ -350,7 +342,7 @@  config CRYPTO
 config LIVEPATCH
 	bool "Live patching support"
 	default X86
-	depends on HAS_BUILD_ID = "y"
+	depends on "$(XEN_HAS_BUILD_ID)" = "y"
 	---help---
 	  Allows a running Xen hypervisor to be dynamically patched using
 	  binary patches without rebooting. This is primarily used to binarily
diff --git a/xen/tools/kconfig/.gitignore b/xen/tools/kconfig/.gitignore
index ca38e983d698..b5bf92f66d11 100644
--- a/xen/tools/kconfig/.gitignore
+++ b/xen/tools/kconfig/.gitignore
@@ -1,12 +1,8 @@ 
 #
 # Generated files
 #
-config*
-*.lex.c
-*.tab.c
-*.tab.h
-zconf.hash.c
 *.moc
+*conf-cfg
 
 #
 # configuration programs
diff --git a/xen/tools/kconfig/Makefile b/xen/tools/kconfig/Makefile
index c8ad69501c06..ef2f2336c469 100644
--- a/xen/tools/kconfig/Makefile
+++ b/xen/tools/kconfig/Makefile
@@ -1,9 +1,10 @@ 
+# SPDX-License-Identifier: GPL-2.0
 # ===========================================================================
 # Kernel configuration targets
 # These targets are used from top-level makefile
 
-PHONY += xconfig gconfig menuconfig config silentoldconfig \
-	localmodconfig localyesconfig
+PHONY += xconfig gconfig menuconfig config localmodconfig localyesconfig \
+	build_menuconfig build_nconfig build_gconfig build_xconfig
 
 ifdef KBUILD_KCONFIG
 Kconfig := $(KBUILD_KCONFIG)
@@ -11,6 +12,10 @@  else
 Kconfig := Kconfig
 endif
 
+ifndef KBUILD_DEFCONFIG
+KBUILD_DEFCONFIG := defconfig
+endif
+
 ifeq ($(quiet),silent_)
 silent := -s
 endif
@@ -33,49 +38,52 @@  config: $(obj)/conf
 nconfig: $(obj)/nconf
 	$< $(silent) $(Kconfig)
 
-silentoldconfig: $(obj)/conf
-	$(Q)mkdir -p include/config include/generated
-	$< $(silent) --$@ $(Kconfig)
+build_menuconfig: $(obj)/mconf
+
+build_nconfig: $(obj)/nconf
 
-localyesconfig localmodconfig: $(obj)/streamline_config.pl $(obj)/conf
-	$(Q)mkdir -p include/config include/generated
-	$(Q)perl $< --$@ $(srctree) $(Kconfig) > .tmp.config
+build_gconfig: $(obj)/gconf
+
+build_xconfig: $(obj)/qconf
+
+localyesconfig localmodconfig: $(obj)/conf
+	$(Q)perl $(srctree)/$(src)/streamline_config.pl --$@ $(srctree) $(Kconfig) > .tmp.config
 	$(Q)if [ -f .config ]; then 					\
 			cmp -s .tmp.config .config ||			\
 			(mv -f .config .config.old.1;			\
 			 mv -f .tmp.config .config;			\
-			 $(obj)/conf $(silent) --silentoldconfig $(Kconfig); \
+			 $< $(silent) --oldconfig $(Kconfig);		\
 			 mv -f .config.old.1 .config.old)		\
 	else								\
 			mv -f .tmp.config .config;			\
-			$(obj)/conf $(silent) --silentoldconfig $(Kconfig); \
+			$< $(silent) --oldconfig $(Kconfig);		\
 	fi
 	$(Q)rm -f .tmp.config
 
 # These targets map 1:1 to the commandline options of 'conf'
+#
+# Note:
+#  syncconfig has become an internal implementation detail and is now
+#  deprecated for external use
 simple-targets := oldconfig allnoconfig allyesconfig allmodconfig \
-	alldefconfig randconfig listnewconfig olddefconfig
+	alldefconfig randconfig listnewconfig olddefconfig syncconfig
 PHONY += $(simple-targets)
 
 $(simple-targets): $(obj)/conf
 	$< $(silent) --$@ $(Kconfig)
 
-PHONY += oldnoconfig savedefconfig defconfig
-
-# oldnoconfig is an alias of olddefconfig, because people already are dependent
-# on its behavior (sets new symbols to their default value but not 'n') with the
-# counter-intuitive name.
-oldnoconfig: olddefconfig
+PHONY += savedefconfig defconfig
 
 savedefconfig: $(obj)/conf
 	$< $(silent) --$@=defconfig $(Kconfig)
 
 defconfig: $(obj)/conf
-ifeq ($(KBUILD_DEFCONFIG),)
-	$< $(silent) --defconfig $(Kconfig)
-else
+ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
 	@$(kecho) "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
 	$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG) $(Kconfig)
+else
+	@$(kecho) "*** Default configuration is based on target '$(KBUILD_DEFCONFIG)'"
+	$(Q)$(MAKE) -f $(srctree)/Makefile $(KBUILD_DEFCONFIG)
 endif
 
 %_defconfig: $(obj)/conf
@@ -86,7 +94,7 @@  configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/c
 %.config: $(obj)/conf
 	$(if $(call configfiles),, $(error No configuration exists for this target on this architecture))
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(configfiles)
-	+$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
+	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 
 PHONY += kvmconfig
 kvmconfig: kvm_guest.config
@@ -100,18 +108,24 @@  PHONY += tinyconfig
 tinyconfig:
 	$(Q)$(MAKE) -f $(srctree)/Makefile allnoconfig tiny.config
 
+# CHECK: -o cache_dir=<path> working?
+PHONY += testconfig
+testconfig: $(obj)/conf
+	$(PYTHON3) -B -m pytest $(srctree)/$(src)/tests \
+	-o cache_dir=$(abspath $(obj)/tests/.cache) \
+	$(if $(findstring 1,$(KBUILD_VERBOSE)),--capture=no)
+clean-files += tests/.cache
+
 # Help text used by make help
 help:
 	@echo  '  config	  - Update current config utilising a line-oriented program'
-	@echo  '  nconfig         - Update current config utilising a ncurses menu based'
-	@echo  '                    program'
+	@echo  '  nconfig         - Update current config utilising a ncurses menu based program'
 	@echo  '  menuconfig	  - Update current config utilising a menu based program'
 	@echo  '  xconfig	  - Update current config utilising a Qt based front-end'
 	@echo  '  gconfig	  - Update current config utilising a GTK+ based front-end'
 	@echo  '  oldconfig	  - Update current config utilising a provided .config as base'
 	@echo  '  localmodconfig  - Update current config disabling modules not loaded'
 	@echo  '  localyesconfig  - Update current config converting local mods to core'
-	@echo  '  silentoldconfig - Same as oldconfig, but quietly, additionally update deps'
 	@echo  '  defconfig	  - New config with default from ARCH supplied defconfig'
 	@echo  '  savedefconfig   - Save current config as ./defconfig (minimal config)'
 	@echo  '  allnoconfig	  - New config where all options are answered with no'
@@ -120,165 +134,77 @@  help:
 	@echo  '  alldefconfig    - New config with all symbols set to default'
 	@echo  '  randconfig	  - New config with random answer to all options'
 	@echo  '  listnewconfig   - List new options'
-	@echo  '  olddefconfig	  - Same as silentoldconfig but sets new symbols to their'
-	@echo  '                    default value'
+	@echo  '  olddefconfig	  - Same as oldconfig but sets new symbols to their'
+	@echo  '                    default value without prompting'
 	@echo  '  kvmconfig	  - Enable additional options for kvm guest kernel support'
 	@echo  '  xenconfig       - Enable additional options for xen dom0 and guest kernel support'
 	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
-
-# lxdialog stuff
-check-lxdialog  := $(srctree)/$(src)/lxdialog/check-lxdialog.sh
-
-# Use recursively expanded variables so we do not call gcc unless
-# we really need to do so. (Do not call gcc as part of make mrproper)
-HOST_EXTRACFLAGS += $(shell $(CONFIG_SHELL) $(check-lxdialog) -ccflags) \
-                    -DLOCALE
+	@echo  '  testconfig	  - Run Kconfig unit tests (requires python3 and pytest)'
 
 # ===========================================================================
-# Shared Makefile for the various kconfig executables:
-# conf:	  Used for defconfig, oldconfig and related targets
-# nconf:  Used for the nconfig target.
-#         Utilizes ncurses
-# mconf:  Used for the menuconfig target
-#         Utilizes the lxdialog package
-# qconf:  Used for the xconfig target
-#         Based on Qt which needs to be installed to compile it
-# gconf:  Used for the gconfig target
-#         Based on GTK+ which needs to be installed to compile it
 # object files used by all kconfig flavours
+common-objs	:= confdata.o expr.o lexer.lex.o parser.tab.o preprocess.o \
+		   symbol.o
 
-lxdialog := lxdialog/checklist.o lxdialog/util.o lxdialog/inputbox.o
-lxdialog += lxdialog/textbox.o lxdialog/yesno.o lxdialog/menubox.o
+$(obj)/lexer.lex.o: $(obj)/parser.tab.h
+HOSTCFLAGS_lexer.lex.o	:= -I $(srctree)/$(src)
+HOSTCFLAGS_parser.tab.o	:= -I $(srctree)/$(src)
 
-conf-objs	:= conf.o  zconf.tab.o
-mconf-objs     := mconf.o zconf.tab.o $(lxdialog)
-nconf-objs     := nconf.o zconf.tab.o nconf.gui.o
-qconf-cxxobjs	:= qconf.o
-qconf-objs	:= zconf.tab.o
-gconf-objs	:= gconf.o zconf.tab.o
-
-hostprogs-y := conf nconf mconf qconf gconf
-
-clean-files	:= qconf.moc .tmp_qtcheck .tmp_gtkcheck
-clean-files	+= zconf.tab.c zconf.lex.c zconf.hash.c
-
-# Check that we have the required ncurses stuff installed for lxdialog (menuconfig)
-PHONY += $(obj)/dochecklxdialog
-$(addprefix $(obj)/,$(lxdialog)): $(obj)/dochecklxdialog
-$(obj)/dochecklxdialog:
-	$(Q)$(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTLOADLIBES_mconf)
-
-always := dochecklxdialog
-
-# generated files seem to need this to find local include files
-HOSTCFLAGS_zconf.lex.o	:= -I$(src)
-HOSTCFLAGS_zconf.tab.o	:= -I$(src)
-
-LEX_PREFIX_zconf	:= zconf
-YACC_PREFIX_zconf	:= zconf
-
-HOSTLOADLIBES_qconf	= $(KC_QT_LIBS)
-HOSTCXXFLAGS_qconf.o	= $(KC_QT_CFLAGS)
-
-HOSTLOADLIBES_gconf	= `pkg-config --libs gtk+-2.0 gmodule-2.0 libglade-2.0`
-HOSTCFLAGS_gconf.o	= `pkg-config --cflags gtk+-2.0 gmodule-2.0 libglade-2.0` \
-                          -Wno-missing-prototypes
-
-HOSTLOADLIBES_mconf   = $(shell $(CONFIG_SHELL) $(check-lxdialog) -ldflags $(HOSTCC))
-
-HOSTLOADLIBES_nconf	= $(shell \
-				pkg-config --libs menuw panelw ncursesw 2>/dev/null \
-				|| pkg-config --libs menu panel ncurses 2>/dev/null \
-				|| echo "-lmenu -lpanel -lncurses"  )
-$(obj)/qconf.o: $(obj)/.tmp_qtcheck
-
-ifeq ($(MAKECMDGOALS),xconfig)
-$(obj)/.tmp_qtcheck: $(src)/Makefile
--include $(obj)/.tmp_qtcheck
-
-# Qt needs some extra effort...
-$(obj)/.tmp_qtcheck:
-	@set -e; $(kecho) "  CHECK   qt"; dir=""; pkg=""; \
-	if ! pkg-config --exists QtCore 2> /dev/null; then \
-	    echo "* Unable to find the Qt4 tool qmake. Trying to use Qt3"; \
-	    pkg-config --exists qt 2> /dev/null && pkg=qt; \
-	    pkg-config --exists qt-mt 2> /dev/null && pkg=qt-mt; \
-	    if [ -n "$$pkg" ]; then \
-	      cflags="\$$(shell pkg-config $$pkg --cflags)"; \
-	      libs="\$$(shell pkg-config $$pkg --libs)"; \
-	      moc="\$$(shell pkg-config $$pkg --variable=prefix)/bin/moc"; \
-	      dir="$$(pkg-config $$pkg --variable=prefix)"; \
-	    else \
-	      for d in $$QTDIR /usr/share/qt* /usr/lib/qt*; do \
-	        if [ -f $$d/include/qconfig.h ]; then dir=$$d; break; fi; \
-	      done; \
-	      if [ -z "$$dir" ]; then \
-	        echo >&2 "*"; \
-	        echo >&2 "* Unable to find any Qt installation. Please make sure that"; \
-	        echo >&2 "* the Qt4 or Qt3 development package is correctly installed and"; \
-	        echo >&2 "* either qmake can be found or install pkg-config or set"; \
-	        echo >&2 "* the QTDIR environment variable to the correct location."; \
-	        echo >&2 "*"; \
-	        false; \
-	      fi; \
-	      libpath=$$dir/lib; lib=qt; osdir=""; \
-	      $(HOSTCXX) -print-multi-os-directory > /dev/null 2>&1 && \
-	        osdir=x$$($(HOSTCXX) -print-multi-os-directory); \
-	      test -d $$libpath/$$osdir && libpath=$$libpath/$$osdir; \
-	      test -f $$libpath/libqt-mt.so && lib=qt-mt; \
-	      cflags="-I$$dir/include"; \
-	      libs="-L$$libpath -Wl,-rpath,$$libpath -l$$lib"; \
-	      moc="$$dir/bin/moc"; \
-	    fi; \
-	    if [ ! -x $$dir/bin/moc -a -x /usr/bin/moc ]; then \
-	      echo "*"; \
-	      echo "* Unable to find $$dir/bin/moc, using /usr/bin/moc instead."; \
-	      echo "*"; \
-	      moc="/usr/bin/moc"; \
-	    fi; \
-	else \
-	  cflags="\$$(shell pkg-config QtCore QtGui Qt3Support --cflags)"; \
-	  libs="\$$(shell pkg-config QtCore QtGui Qt3Support --libs)"; \
-	  moc="\$$(shell pkg-config QtCore --variable=moc_location)"; \
-	  [ -n "$$moc" ] || moc="\$$(shell pkg-config QtCore --variable=prefix)/bin/moc"; \
-	fi; \
-	echo "KC_QT_CFLAGS=$$cflags" > $@; \
-	echo "KC_QT_LIBS=$$libs" >> $@; \
-	echo "KC_QT_MOC=$$moc" >> $@
-endif
+# conf: Used for defconfig, oldconfig and related targets
+hostprogs-y	+= conf
+conf-objs	:= conf.o $(common-objs)
 
-$(obj)/gconf.o: $(obj)/.tmp_gtkcheck
-
-ifeq ($(MAKECMDGOALS),gconfig)
--include $(obj)/.tmp_gtkcheck
-
-# GTK+ needs some extra effort, too...
-$(obj)/.tmp_gtkcheck:
-	@if `pkg-config --exists gtk+-2.0 gmodule-2.0 libglade-2.0`; then		\
-		if `pkg-config --atleast-version=2.0.0 gtk+-2.0`; then			\
-			touch $@;								\
-		else									\
-			echo >&2 "*"; 							\
-			echo >&2 "* GTK+ is present but version >= 2.0.0 is required.";	\
-			echo >&2 "*";							\
-			false;								\
-		fi									\
-	else										\
-		echo >&2 "*"; 								\
-		echo >&2 "* Unable to find the GTK+ installation. Please make sure that"; 	\
-		echo >&2 "* the GTK+ 2.0 development package is correctly installed..."; 	\
-		echo >&2 "* You need gtk+-2.0, glib-2.0 and libglade-2.0."; 		\
-		echo >&2 "*"; 								\
-		false;									\
-	fi
-endif
+# nconf: Used for the nconfig target based on ncurses
+hostprogs-y	+= nconf
+nconf-objs	:= nconf.o nconf.gui.o $(common-objs)
+
+HOSTLDLIBS_nconf	= $(shell . $(obj)/nconf-cfg && echo $$libs)
+HOSTCFLAGS_nconf.o	= $(shell . $(obj)/nconf-cfg && echo $$cflags)
+HOSTCFLAGS_nconf.gui.o	= $(shell . $(obj)/nconf-cfg && echo $$cflags)
+
+$(obj)/nconf.o $(obj)/nconf.gui.o: $(obj)/nconf-cfg
+
+# mconf: Used for the menuconfig target based on lxdialog
+hostprogs-y	+= mconf
+lxdialog	:= $(addprefix lxdialog/, \
+		     checklist.o inputbox.o menubox.o textbox.o util.o yesno.o)
+mconf-objs	:= mconf.o $(lxdialog) $(common-objs)
+
+HOSTLDLIBS_mconf = $(shell . $(obj)/mconf-cfg && echo $$libs)
+$(foreach f, mconf.o $(lxdialog), \
+  $(eval HOSTCFLAGS_$f = $$(shell . $(obj)/mconf-cfg && echo $$$$cflags)))
+
+$(addprefix $(obj)/, mconf.o $(lxdialog)): $(obj)/mconf-cfg
+
+# qconf: Used for the xconfig target based on Qt
+hostprogs-y	+= qconf
+qconf-cxxobjs	:= qconf.o
+qconf-objs	:= images.o $(common-objs)
 
-$(obj)/zconf.tab.o: $(obj)/zconf.lex.c $(obj)/zconf.hash.c
+HOSTLDLIBS_qconf	= $(shell . $(obj)/qconf-cfg && echo $$libs)
+HOSTCXXFLAGS_qconf.o	= $(shell . $(obj)/qconf-cfg && echo $$cflags)
 
-$(obj)/qconf.o: $(obj)/qconf.moc
+$(obj)/qconf.o: $(obj)/qconf-cfg $(obj)/qconf.moc
 
 quiet_cmd_moc = MOC     $@
-      cmd_moc = $(KC_QT_MOC) -i $< -o $@
+      cmd_moc = $(shell . $(obj)/qconf-cfg && echo $$moc) -i $< -o $@
 
-$(obj)/%.moc: $(src)/%.h $(obj)/.tmp_qtcheck
+$(obj)/%.moc: $(src)/%.h $(obj)/qconf-cfg
 	$(call cmd,moc)
+
+# gconf: Used for the gconfig target based on GTK+
+hostprogs-y	+= gconf
+gconf-objs	:= gconf.o images.o $(common-objs)
+
+HOSTLDLIBS_gconf    = $(shell . $(obj)/gconf-cfg && echo $$libs)
+HOSTCFLAGS_gconf.o  = $(shell . $(obj)/gconf-cfg && echo $$cflags)
+
+$(obj)/gconf.o: $(obj)/gconf-cfg
+
+# check if necessary packages are available, and configure build flags
+filechk_conf_cfg = $(CONFIG_SHELL) $<
+
+$(obj)/%conf-cfg: $(src)/%conf-cfg.sh FORCE
+	$(call filechk,conf_cfg)
+
+clean-files += *conf-cfg
diff --git a/xen/tools/kconfig/Makefile.host b/xen/tools/kconfig/Makefile.host
index 133edfae5b8a..4c51c95d40f4 100644
--- a/xen/tools/kconfig/Makefile.host
+++ b/xen/tools/kconfig/Makefile.host
@@ -1,3 +1,21 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+# LEX
+# ---------------------------------------------------------------------------
+quiet_cmd_flex = LEX     $@
+      cmd_flex = $(LEX) -o$@ -L $<
+
+$(obj)/%.lex.c: $(src)/%.l FORCE
+	$(call if_changed,flex)
+
+# YACC
+# ---------------------------------------------------------------------------
+quiet_cmd_bison = YACC    $(basename $@).[ch]
+      cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
+
+$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
+	$(call if_changed,bison)
+
 # ==========================================================================
 # Building binaries on the host system
 # Binaries are used during the compilation of the kernel, for example
@@ -5,7 +23,7 @@ 
 #
 # Both C and C++ are supported, but preferred language is C for such utilities.
 #
-# Sample syntax (see Documentation/kbuild/makefiles.txt for reference)
+# Sample syntax (see Documentation/kbuild/makefiles.rst for reference)
 # hostprogs-y := bin2hex
 # Will compile bin2hex.c and create an executable named bin2hex
 #
@@ -21,6 +39,8 @@ 
 # They are linked as C++ code to the executable qconf
 
 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
+host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
+host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
 
 # C code
 # Executables compiled from a single .c file
@@ -42,42 +62,38 @@  host-cxxmulti	:= $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
 # C++ Object (.o) files compiled from .cc files
 host-cxxobjs	:= $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
 
-# output directory for programs/.o files
-# hostprogs-y := tools/build may have been specified.
-# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
-host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
-
-host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
+# Object (.o) files used by the shared libaries
+host-cshobjs	:= $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
+host-cxxshobjs	:= $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
 
-
-__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
 host-csingle	:= $(addprefix $(obj)/,$(host-csingle))
 host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))
 host-cobjs	:= $(addprefix $(obj)/,$(host-cobjs))
 host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))
 host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))
-host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
-
-obj-dirs += $(host-objdirs)
+host-cshlib	:= $(addprefix $(obj)/,$(host-cshlib))
+host-cxxshlib	:= $(addprefix $(obj)/,$(host-cxxshlib))
+host-cshobjs	:= $(addprefix $(obj)/,$(host-cshobjs))
+host-cxxshobjs	:= $(addprefix $(obj)/,$(host-cxxshobjs))
 
 #####
 # Handle options to gcc. Support building with separate output directory
 
-_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
-                 $(HOSTCFLAGS_$(basetarget).o)
-_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
-                 $(HOSTCXXFLAGS_$(basetarget).o)
-
-ifeq ($(KBUILD_SRC),)
-__hostc_flags	= $(_hostc_flags)
-__hostcxx_flags	= $(_hostcxx_flags)
-else
-__hostc_flags	= -I$(obj) $(call flags,_hostc_flags)
-__hostcxx_flags	= -I$(obj) $(call flags,_hostcxx_flags)
+_hostc_flags   = $(KBUILD_HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
+                 $(HOSTCFLAGS_$(target-stem).o)
+_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
+                 $(HOSTCXXFLAGS_$(target-stem).o)
+
+# $(objtree)/$(obj) for including generated headers from checkin source files
+ifeq ($(KBUILD_EXTMOD),)
+ifdef building_out_of_srctree
+_hostc_flags   += -I $(objtree)/$(obj)
+_hostcxx_flags += -I $(objtree)/$(obj)
+endif
 endif
 
-hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
-hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
+hostc_flags    = -Wp,-MD,$(depfile) $(_hostc_flags)
+hostcxx_flags  = -Wp,-MD,$(depfile) $(_hostcxx_flags)
 
 #####
 # Compile programs on the host
@@ -85,17 +101,17 @@  hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
 # Create executable from a single .c file
 # host-csingle -> Executable
 quiet_cmd_host-csingle 	= HOSTCC  $@
-      cmd_host-csingle	= $(HOSTCC) $(hostc_flags) -o $@ $< \
-	  	$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+      cmd_host-csingle	= $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
+		$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
 	$(call if_changed_dep,host-csingle)
 
 # Link an executable based on list of .o files, all plain c
 # host-cmulti -> executable
 quiet_cmd_host-cmulti	= HOSTLD  $@
-      cmd_host-cmulti	= $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
-			  $(addprefix $(obj)/,$($(@F)-objs)) \
-			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+      cmd_host-cmulti	= $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
+			  $(addprefix $(obj)/, $($(target-stem)-objs)) \
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 $(host-cmulti): FORCE
 	$(call if_changed,host-cmulti)
 $(call multi_depend, $(host-cmulti), , -objs)
@@ -110,10 +126,10 @@  $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 # Link an executable based on list of .o files, a mixture of .c and .cc
 # host-cxxmulti -> executable
 quiet_cmd_host-cxxmulti	= HOSTLD  $@
-      cmd_host-cxxmulti	= $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
+      cmd_host-cxxmulti	= $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
 			  $(foreach o,objs cxxobjs,\
-			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
-			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+			  $(addprefix $(obj)/, $($(target-stem)-$(o)))) \
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 $(host-cxxmulti): FORCE
 	$(call if_changed,host-cxxmulti)
 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
@@ -124,5 +140,42 @@  quiet_cmd_host-cxxobjs	= HOSTCXX $@
 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 	$(call if_changed_dep,host-cxxobjs)
 
+# Compile .c file, create position independent .o file
+# host-cshobjs -> .o
+quiet_cmd_host-cshobjs	= HOSTCC  -fPIC $@
+      cmd_host-cshobjs	= $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
+$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
+	$(call if_changed_dep,host-cshobjs)
+
+# Compile .c file, create position independent .o file
+# Note that plugin capable gcc versions can be either C or C++ based
+# therefore plugin source files have to be compilable in both C and C++ mode.
+# This is why a C++ compiler is invoked on a .c file.
+# host-cxxshobjs -> .o
+quiet_cmd_host-cxxshobjs	= HOSTCXX -fPIC $@
+      cmd_host-cxxshobjs	= $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
+$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
+	$(call if_changed_dep,host-cxxshobjs)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cshlib)
+quiet_cmd_host-cshlib	= HOSTLLD -shared $@
+      cmd_host-cshlib	= $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
+			  $(addprefix $(obj)/, $($(target-stem)-objs)) \
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem).so)
+$(host-cshlib): FORCE
+	$(call if_changed,host-cshlib)
+$(call multi_depend, $(host-cshlib), .so, -objs)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cxxshlib)
+quiet_cmd_host-cxxshlib	= HOSTLLD -shared $@
+      cmd_host-cxxshlib	= $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
+			  $(addprefix $(obj)/, $($(target-stem)-objs)) \
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem).so)
+$(host-cxxshlib): FORCE
+	$(call if_changed,host-cxxshlib)
+$(call multi_depend, $(host-cxxshlib), .so, -objs)
+
 targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
-	   $(host-cxxmulti) $(host-cxxobjs)
+	   $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
diff --git a/xen/tools/kconfig/Makefile.kconfig b/xen/tools/kconfig/Makefile.kconfig
index dbd89120154d..065f4b84716f 100644
--- a/xen/tools/kconfig/Makefile.kconfig
+++ b/xen/tools/kconfig/Makefile.kconfig
@@ -4,8 +4,8 @@ 
 all:
 
 # Xen doesn't have a silent build flag
-quiet := silent_
-Q := @
+quiet :=
+Q :=
 kecho := :
 
 # eventually you'll want to do out of tree builds
@@ -13,16 +13,44 @@  srctree := $(XEN_ROOT)/xen
 objtree := $(srctree)
 src := tools/kconfig
 obj := $(src)
-KBUILD_SRC :=
 
 # handle functions (most of these lifted from different Linux makefiles
 dot-target = $(dir $@).$(notdir $@)
 depfile = $(subst $(comma),,$(dot-target).d)
 basetarget = $(basename $(notdir $@))
+# target with $(obj)/ and its suffix stripped
+target-stem = $(basename $(patsubst $(obj)/%,%,$@))
 cmd = $(cmd_$(1))
 if_changed = $(cmd_$(1))
 if_changed_dep = $(cmd_$(1))
 
+###
+# filechk is used to check if the content of a generated file is updated.
+# Sample usage:
+#
+# filechk_sample = echo $(KERNELRELEASE)
+# version.h: FORCE
+#	$(call filechk,sample)
+#
+# The rule defined shall write to stdout the content of the new file.
+# The existing file will be compared with the new one.
+# - If no file exist it is created
+# - If the content differ the new file is used
+# - If they are equal no change, and no timestamp update
+# - stdin is piped in from the first prerequisite ($<) so one has
+#   to specify a valid file as first prerequisite (often the kbuild file)
+define filechk
+	$(Q)set -e;				\
+	mkdir -p $(dir $@);			\
+	{ $(filechk_$(1)); } > $@.tmp;		\
+	if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
+		rm -f $@.tmp;			\
+	else					\
+		$(kecho) '  UPD     $@';	\
+		mv -f $@.tmp $@;		\
+	fi
+endef
+
 define multi_depend
 $(foreach m, $(notdir $1), \
 	$(eval $(obj)/$m: \
@@ -38,6 +66,8 @@  CONFIG_SHELL := $(SHELL)
 # provide the host compiler
 HOSTCC ?= gcc
 HOSTCXX ?= g++
+YACC = $(if $(BISON),$(BISON),bison)
+LEX = $(if $(FLEX),$(FLEX),flex)
 
 # force target
 PHONY += FORCE
@@ -48,6 +78,18 @@  FORCE:
 include $(src)/Makefile
 include $(src)/Makefile.host
 
+# Add intermediate targets:
+# When building objects with specific suffix patterns, add intermediate
+# targets that the final targets are derived from.
+intermediate_targets = $(foreach sfx, $(2), \
+				$(patsubst %$(strip $(1)),%$(sfx), \
+					$(filter %$(strip $(1)), $(targets))))
+
+# %.lex.o <- %.lex.c <- %.l
+# %.tab.o <- %.tab.[ch] <- %.y
+targets += $(call intermediate_targets, .lex.o, .lex.c) \
+	   $(call intermediate_targets, .tab.o, .tab.c .tab.h)
+
 # clean up rule
 clean-deps = $(foreach f,$(host-cobjs) $(host-cxxobjs),$(dir $f).$(notdir $f).d)
 clean-shipped = $(patsubst %_shipped,%,$(wildcard $(obj)/*_shipped))
@@ -59,4 +101,6 @@  clean:
 	rm -rf $(clean-shipped)
 
 $(obj)/zconf%: $(src)/zconf%_shipped
-	@cp -f $< $@
+	cp -f $< $@
+
+.PHONY: $(PHONY)
diff --git a/xen/tools/kconfig/conf.c b/xen/tools/kconfig/conf.c
index d986f44098f9..40e16e871ae2 100644
--- a/xen/tools/kconfig/conf.c
+++ b/xen/tools/kconfig/conf.c
@@ -1,9 +1,10 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <ctype.h>
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -18,11 +19,10 @@ 
 
 static void conf(struct menu *menu);
 static void check_conf(struct menu *menu);
-static void xfgets(char *str, int size, FILE *in);
 
 enum input_mode {
 	oldaskconfig,
-	silentoldconfig,
+	syncconfig,
 	oldconfig,
 	allnoconfig,
 	allyesconfig,
@@ -33,14 +33,14 @@  enum input_mode {
 	savedefconfig,
 	listnewconfig,
 	olddefconfig,
-} input_mode = oldaskconfig;
+};
+static enum input_mode input_mode = oldaskconfig;
 
 static int indent = 1;
 static int tty_stdio;
-static int valid_stdin = 1;
 static int sync_kconfig;
 static int conf_cnt;
-static char line[128];
+static char line[PATH_MAX];
 static struct menu *rootEntry;
 
 static void print_help(struct menu *menu)
@@ -70,14 +70,14 @@  static void strip(char *str)
 		*p-- = 0;
 }
 
-static void check_stdin(void)
+/* Helper function to facilitate fgets() by Jean Sacren. */
+static void xfgets(char *str, int size, FILE *in)
 {
-	if (!valid_stdin) {
-		printf("aborted!\n\n");
-		printf("Console input/output is redirected. ");
-		printf("Run 'make oldconfig' to update configuration.\n\n");
-		exit(1);
-	}
+	if (!fgets(str, size, in))
+		fprintf(stderr, "\nError in reading or end of file.\n");
+
+	if (!tty_stdio)
+		printf("%s", str);
 }
 
 static int conf_askvalue(struct symbol *sym, const char *def)
@@ -90,7 +90,7 @@  static int conf_askvalue(struct symbol *sym, const char *def)
 	line[0] = '\n';
 	line[1] = 0;
 
-	if (!sym_is_changable(sym)) {
+	if (!sym_is_changeable(sym)) {
 		printf("%s\n", def);
 		line[0] = '\n';
 		line[1] = 0;
@@ -99,18 +99,15 @@  static int conf_askvalue(struct symbol *sym, const char *def)
 
 	switch (input_mode) {
 	case oldconfig:
-	case silentoldconfig:
+	case syncconfig:
 		if (sym_has_value(sym)) {
 			printf("%s\n", def);
 			return 0;
 		}
-		check_stdin();
 		/* fall through */
 	case oldaskconfig:
 		fflush(stdout);
-		xfgets(line, 128, stdin);
-		if (!tty_stdio)
-			printf("\n");
+		xfgets(line, sizeof(line), stdin);
 		return 1;
 	default:
 		break;
@@ -190,9 +187,7 @@  static int conf_sym(struct menu *menu)
 			printf("/m");
 		if (oldval != yes && sym_tristate_within_range(sym, yes))
 			printf("/y");
-		if (menu_has_help(menu))
-			printf("/?");
-		printf("] ");
+		printf("/?] ");
 		if (!conf_askvalue(sym, sym_get_string_value(sym)))
 			return 0;
 		strip(line);
@@ -239,7 +234,7 @@  static int conf_choice(struct menu *menu)
 
 	sym = menu->sym;
 	is_new = !sym_has_value(sym);
-	if (sym_is_changable(sym)) {
+	if (sym_is_changeable(sym)) {
 		conf_sym(menu);
 		sym_calc_value(sym);
 		switch (sym_get_tristate_value(sym)) {
@@ -294,23 +289,19 @@  static int conf_choice(struct menu *menu)
 			printf("[1]: 1\n");
 			goto conf_childs;
 		}
-		printf("[1-%d", cnt);
-		if (menu_has_help(menu))
-			printf("?");
-		printf("]: ");
+		printf("[1-%d?]: ", cnt);
 		switch (input_mode) {
 		case oldconfig:
-		case silentoldconfig:
+		case syncconfig:
 			if (!is_new) {
 				cnt = def;
 				printf("%d\n", cnt);
 				break;
 			}
-			check_stdin();
 			/* fall through */
 		case oldaskconfig:
 			fflush(stdout);
-			xfgets(line, 128, stdin);
+			xfgets(line, sizeof(line), stdin);
 			strip(line);
 			if (line[0] == '?') {
 				print_help(menu);
@@ -366,10 +357,11 @@  static void conf(struct menu *menu)
 
 		switch (prop->type) {
 		case P_MENU:
-			if ((input_mode == silentoldconfig ||
-			     input_mode == listnewconfig ||
-			     input_mode == olddefconfig) &&
-			    rootEntry != menu) {
+			/*
+			 * Except in oldaskconfig mode, we show only menus that
+			 * contain new symbols.
+			 */
+			if (input_mode != oldaskconfig && rootEntry != menu) {
 				check_conf(menu);
 				return;
 			}
@@ -426,13 +418,23 @@  static void check_conf(struct menu *menu)
 
 	sym = menu->sym;
 	if (sym && !sym_has_value(sym)) {
-		if (sym_is_changable(sym) ||
+		if (sym_is_changeable(sym) ||
 		    (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes)) {
 			if (input_mode == listnewconfig) {
-				if (sym->name && !sym_is_choice_value(sym)) {
-					printf("%s%s\n", CONFIG_, sym->name);
+				if (sym->name) {
+					const char *str;
+
+					if (sym->type == S_STRING) {
+						str = sym_get_string_value(sym);
+						str = sym_escape_string_value(str);
+						printf("%s%s=%s\n", CONFIG_, sym->name, str);
+						free((void *)str);
+					} else {
+						str = sym_get_string_value(sym);
+						printf("%s%s=%s\n", CONFIG_, sym->name, str);
+					}
 				}
-			} else if (input_mode != olddefconfig) {
+			} else {
 				if (!conf_cnt++)
 					printf("*\n* Restart config...\n*\n");
 				rootEntry = menu_get_parent_menu(menu);
@@ -448,8 +450,8 @@  static void check_conf(struct menu *menu)
 static struct option long_opts[] = {
 	{"oldaskconfig",    no_argument,       NULL, oldaskconfig},
 	{"oldconfig",       no_argument,       NULL, oldconfig},
-	{"silentoldconfig", no_argument,       NULL, silentoldconfig},
-	{"defconfig",       optional_argument, NULL, defconfig},
+	{"syncconfig",      no_argument,       NULL, syncconfig},
+	{"defconfig",       required_argument, NULL, defconfig},
 	{"savedefconfig",   required_argument, NULL, savedefconfig},
 	{"allnoconfig",     no_argument,       NULL, allnoconfig},
 	{"allyesconfig",    no_argument,       NULL, allyesconfig},
@@ -458,12 +460,6 @@  static struct option long_opts[] = {
 	{"randconfig",      no_argument,       NULL, randconfig},
 	{"listnewconfig",   no_argument,       NULL, listnewconfig},
 	{"olddefconfig",    no_argument,       NULL, olddefconfig},
-	/*
-	 * oldnoconfig is an alias of olddefconfig, because people already
-	 * are dependent on its behavior(sets new symbols to their default
-	 * value but not 'n') with the counter-intuitive name.
-	 */
-	{"oldnoconfig",     no_argument,       NULL, olddefconfig},
 	{NULL, 0, NULL, 0}
 };
 
@@ -475,9 +471,9 @@  static void conf_usage(const char *progname)
 	printf("  --listnewconfig         List new options\n");
 	printf("  --oldaskconfig          Start a new configuration using a line-oriented program\n");
 	printf("  --oldconfig             Update a configuration using a provided .config as base\n");
-	printf("  --silentoldconfig       Same as oldconfig, but quietly, additionally update deps\n");
-	printf("  --olddefconfig          Same as silentoldconfig but sets new symbols to their default value\n");
-	printf("  --oldnoconfig           An alias of olddefconfig\n");
+	printf("  --syncconfig            Similar to oldconfig but generates configuration in\n"
+	       "                          include/{generated/,config/}\n");
+	printf("  --olddefconfig          Same as oldconfig but sets new symbols to their default value\n");
 	printf("  --defconfig <file>      New config with default defined in <file>\n");
 	printf("  --savedefconfig <file>  Save the minimal current configuration to <file>\n");
 	printf("  --allnoconfig           New config where all options are answered with no\n");
@@ -492,9 +488,9 @@  int main(int ac, char **av)
 	const char *progname = av[0];
 	int opt;
 	const char *name, *defconfig_file = NULL /* gcc uninit */;
-	struct stat tmpstat;
+	int no_conf_write = 0;
 
-	tty_stdio = isatty(0) && isatty(1) && isatty(2);
+	tty_stdio = isatty(0) && isatty(1);
 
 	while ((opt = getopt_long(ac, av, "s", long_opts, NULL)) != -1) {
 		if (opt == 's') {
@@ -503,7 +499,12 @@  int main(int ac, char **av)
 		}
 		input_mode = (enum input_mode)opt;
 		switch (opt) {
-		case silentoldconfig:
+		case syncconfig:
+			/*
+			 * syncconfig is invoked during the build stage.
+			 * Suppress distracting "configuration written to ..."
+			 */
+			conf_set_message_callback(NULL);
 			sync_kconfig = 1;
 			break;
 		case defconfig:
@@ -551,39 +552,27 @@  int main(int ac, char **av)
 		}
 	}
 	if (ac == optind) {
-		printf("%s: Kconfig file missing\n", av[0]);
+		fprintf(stderr, "%s: Kconfig file missing\n", av[0]);
 		conf_usage(progname);
 		exit(1);
 	}
 	name = av[optind];
 	conf_parse(name);
 	//zconfdump(stdout);
-	if (sync_kconfig) {
-		name = conf_get_configname();
-		if (stat(name, &tmpstat)) {
-			fprintf(stderr, "***\n"
-				"*** Configuration file \"%s\" not found!\n"
-				"***\n"
-				"*** Please run some configurator (e.g. \"make oldconfig\" or\n"
-				"*** \"make menuconfig\" or \"make xconfig\").\n"
-				"***\n", name);
-			exit(1);
-		}
-	}
 
 	switch (input_mode) {
 	case defconfig:
-		if (!defconfig_file)
-			defconfig_file = conf_get_default_confname();
 		if (conf_read(defconfig_file)) {
-			printf("***\n"
-				"*** Can't find default configuration \"%s\"!\n"
-				"***\n", defconfig_file);
+			fprintf(stderr,
+				"***\n"
+				  "*** Can't find default configuration \"%s\"!\n"
+				  "***\n",
+				defconfig_file);
 			exit(1);
 		}
 		break;
 	case savedefconfig:
-	case silentoldconfig:
+	case syncconfig:
 	case oldaskconfig:
 	case oldconfig:
 	case listnewconfig:
@@ -628,15 +617,15 @@  int main(int ac, char **av)
 	}
 
 	if (sync_kconfig) {
-		if (conf_get_changed()) {
-			name = getenv("KCONFIG_NOSILENTUPDATE");
-			if (name && *name) {
+		name = getenv("KCONFIG_NOSILENTUPDATE");
+		if (name && *name) {
+			if (conf_get_changed()) {
 				fprintf(stderr,
 					"\n*** The configuration requires explicit update.\n\n");
 				return 1;
 			}
+			no_conf_write = 1;
 		}
-		valid_stdin = tty_stdio;
 	}
 
 	switch (input_mode) {
@@ -664,54 +653,48 @@  int main(int ac, char **av)
 	case oldaskconfig:
 		rootEntry = &rootmenu;
 		conf(&rootmenu);
-		input_mode = silentoldconfig;
+		input_mode = oldconfig;
 		/* fall through */
 	case oldconfig:
 	case listnewconfig:
-	case olddefconfig:
-	case silentoldconfig:
+	case syncconfig:
 		/* Update until a loop caused no more changes */
 		do {
 			conf_cnt = 0;
 			check_conf(&rootmenu);
-		} while (conf_cnt &&
-			 (input_mode != listnewconfig &&
-			  input_mode != olddefconfig));
+		} while (conf_cnt);
+		break;
+	case olddefconfig:
+	default:
 		break;
 	}
 
-	if (sync_kconfig) {
-		/* silentoldconfig is used during the build so we shall update autoconf.
-		 * All other commands are only used to generate a config.
-		 */
-		if (conf_get_changed() && conf_write(NULL)) {
-			fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
-			exit(1);
-		}
-		if (conf_write_autoconf()) {
-			fprintf(stderr, "\n*** Error during update of the configuration.\n\n");
-			return 1;
-		}
-	} else if (input_mode == savedefconfig) {
+	if (input_mode == savedefconfig) {
 		if (conf_write_defconfig(defconfig_file)) {
 			fprintf(stderr, "n*** Error while saving defconfig to: %s\n\n",
 				defconfig_file);
 			return 1;
 		}
 	} else if (input_mode != listnewconfig) {
-		if (conf_write(NULL)) {
+		if (!no_conf_write && conf_write(NULL)) {
 			fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
 			exit(1);
 		}
+
+		/*
+		 * Create auto.conf if it does not exist.
+		 * This prevents GNU Make 4.1 or older from emitting
+		 * "include/config/auto.conf: No such file or directory"
+		 * in the top-level Makefile
+		 *
+		 * syncconfig always creates or updates auto.conf because it is
+		 * used during the build.
+		 */
+		if (conf_write_autoconf(sync_kconfig) && sync_kconfig) {
+			fprintf(stderr,
+				"\n*** Error during sync of the configuration.\n\n");
+			return 1;
+		}
 	}
 	return 0;
 }
-
-/*
- * Helper function to facilitate fgets() by Jean Sacren.
- */
-void xfgets(char *str, int size, FILE *in)
-{
-	if (fgets(str, size, in) == NULL)
-		fprintf(stderr, "\nError in reading or end of file.\n");
-}
diff --git a/xen/tools/kconfig/confdata.c b/xen/tools/kconfig/confdata.c
index 7d38d87a2e97..3569d2dec37c 100644
--- a/xen/tools/kconfig/confdata.c
+++ b/xen/tools/kconfig/confdata.c
@@ -1,12 +1,14 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
+#include <sys/mman.h>
 #include <sys/stat.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -16,6 +18,151 @@ 
 
 #include "lkc.h"
 
+/* return true if 'path' exists, false otherwise */
+static bool is_present(const char *path)
+{
+	struct stat st;
+
+	return !stat(path, &st);
+}
+
+/* return true if 'path' exists and it is a directory, false otherwise */
+static bool is_dir(const char *path)
+{
+	struct stat st;
+
+	if (stat(path, &st))
+		return 0;
+
+	return S_ISDIR(st.st_mode);
+}
+
+/* return true if the given two files are the same, false otherwise */
+static bool is_same(const char *file1, const char *file2)
+{
+	int fd1, fd2;
+	struct stat st1, st2;
+	void *map1, *map2;
+	bool ret = false;
+
+	fd1 = open(file1, O_RDONLY);
+	if (fd1 < 0)
+		return ret;
+
+	fd2 = open(file2, O_RDONLY);
+	if (fd2 < 0)
+		goto close1;
+
+	ret = fstat(fd1, &st1);
+	if (ret)
+		goto close2;
+	ret = fstat(fd2, &st2);
+	if (ret)
+		goto close2;
+
+	if (st1.st_size != st2.st_size)
+		goto close2;
+
+	map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
+	if (map1 == MAP_FAILED)
+		goto close2;
+
+	map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
+	if (map2 == MAP_FAILED)
+		goto close2;
+
+	if (bcmp(map1, map2, st1.st_size))
+		goto close2;
+
+	ret = true;
+close2:
+	close(fd2);
+close1:
+	close(fd1);
+
+	return ret;
+}
+
+/*
+ * Create the parent directory of the given path.
+ *
+ * For example, if 'include/config/auto.conf' is given, create 'include/config'.
+ */
+static int make_parent_dir(const char *path)
+{
+	char tmp[PATH_MAX + 1];
+	char *p;
+
+	strncpy(tmp, path, sizeof(tmp));
+	tmp[sizeof(tmp) - 1] = 0;
+
+	/* Remove the base name. Just return if nothing is left */
+	p = strrchr(tmp, '/');
+	if (!p)
+		return 0;
+	*(p + 1) = 0;
+
+	/* Just in case it is an absolute path */
+	p = tmp;
+	while (*p == '/')
+		p++;
+
+	while ((p = strchr(p, '/'))) {
+		*p = 0;
+
+		/* skip if the directory exists */
+		if (!is_dir(tmp) && mkdir(tmp, 0755))
+			return -1;
+
+		*p = '/';
+		while (*p == '/')
+			p++;
+	}
+
+	return 0;
+}
+
+static char depfile_path[PATH_MAX];
+static size_t depfile_prefix_len;
+
+/* touch depfile for symbol 'name' */
+static int conf_touch_dep(const char *name)
+{
+	int fd, ret;
+	const char *s;
+	char *d, c;
+
+	/* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
+	if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
+		return -1;
+
+	d = depfile_path + depfile_prefix_len;
+	s = name;
+
+	while ((c = *s++))
+		*d++ = (c == '_') ? '/' : tolower(c);
+	strcpy(d, ".h");
+
+	/* Assume directory path already exists. */
+	fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (fd == -1) {
+		if (errno != ENOENT)
+			return -1;
+
+		ret = make_parent_dir(depfile_path);
+		if (ret)
+			return ret;
+
+		/* Try it again. */
+		fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+		if (fd == -1)
+			return -1;
+	}
+	close(fd);
+
+	return 0;
+}
+
 struct conf_printer {
 	void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
 	void (*print_comment)(FILE *, const char *, void *);
@@ -28,9 +175,7 @@  static void conf_message(const char *fmt, ...)
 	__attribute__ ((format (printf, 1, 2)));
 
 static const char *conf_filename;
-static int conf_lineno, conf_warnings, conf_unsaved;
-
-const char conf_defname[] = "arch/$ARCH/defconfig";
+static int conf_lineno, conf_warnings;
 
 static void conf_warning(const char *fmt, ...)
 {
@@ -43,16 +188,16 @@  static void conf_warning(const char *fmt, ...)
 	conf_warnings++;
 }
 
-static void conf_default_message_callback(const char *fmt, va_list ap)
+static void conf_default_message_callback(const char *s)
 {
 	printf("#\n# ");
-	vprintf(fmt, ap);
+	printf("%s", s);
 	printf("\n#\n");
 }
 
-static void (*conf_message_callback) (const char *fmt, va_list ap) =
+static void (*conf_message_callback)(const char *s) =
 	conf_default_message_callback;
-void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
+void conf_set_message_callback(void (*fn)(const char *s))
 {
 	conf_message_callback = fn;
 }
@@ -60,10 +205,15 @@  void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
 static void conf_message(const char *fmt, ...)
 {
 	va_list ap;
+	char buf[4096];
+
+	if (!conf_message_callback)
+		return;
 
 	va_start(ap, fmt);
-	if (conf_message_callback)
-		conf_message_callback(fmt, ap);
+
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	conf_message_callback(buf);
 	va_end(ap);
 }
 
@@ -74,55 +224,13 @@  const char *conf_get_configname(void)
 	return name ? name : ".config";
 }
 
-const char *conf_get_autoconfig_name(void)
+static const char *conf_get_autoconfig_name(void)
 {
 	char *name = getenv("KCONFIG_AUTOCONFIG");
 
 	return name ? name : "include/config/auto.conf";
 }
 
-static char *conf_expand_value(const char *in)
-{
-	struct symbol *sym;
-	const char *src;
-	static char res_value[SYMBOL_MAXLENGTH];
-	char *dst, name[SYMBOL_MAXLENGTH];
-
-	res_value[0] = 0;
-	dst = name;
-	while ((src = strchr(in, '$'))) {
-		strncat(res_value, in, src - in);
-		src++;
-		dst = name;
-		while (isalnum(*src) || *src == '_')
-			*dst++ = *src++;
-		*dst = 0;
-		sym = sym_lookup(name, 0);
-		sym_calc_value(sym);
-		strcat(res_value, sym_get_string_value(sym));
-		in = src;
-	}
-	strcat(res_value, in);
-
-	return res_value;
-}
-
-char *conf_get_default_confname(void)
-{
-	struct stat buf;
-	static char fullname[PATH_MAX+1];
-	char *env, *name;
-
-	name = conf_expand_value(conf_defname);
-	env = getenv(SRCTREE);
-	if (env) {
-		sprintf(fullname, "%s/%s", env, name);
-		if (!stat(fullname, &buf))
-			return fullname;
-	}
-	return name;
-}
-
 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 {
 	char *p2;
@@ -150,14 +258,6 @@  static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 			conf_warning("symbol value '%s' invalid for %s",
 				     p, sym->name);
 		return 1;
-	case S_OTHER:
-		if (*p != '"') {
-			for (p2 = p; *p2 && !isspace(*p2); p2++)
-				;
-			sym->type = S_STRING;
-			goto done;
-		}
-		/* fall through */
 	case S_STRING:
 		if (*p++ != '"')
 			break;
@@ -176,9 +276,8 @@  static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
 		/* fall through */
 	case S_INT:
 	case S_HEX:
-	done:
 		if (sym_string_valid(sym, p)) {
-			sym->def[def].val = strdup(p);
+			sym->def[def].val = xstrdup(p);
 			sym->flags |= def_flags;
 		} else {
 			if (def != S_DEF_AUTO)
@@ -201,7 +300,7 @@  static int add_byte(int c, char **lineptr, size_t slen, size_t *n)
 	if (new_size > *n) {
 		new_size += LINE_GROWTH - 1;
 		new_size *= 2;
-		nline = realloc(*lineptr, new_size);
+		nline = xrealloc(*lineptr, new_size);
 		if (!nline)
 			return -1;
 
@@ -267,16 +366,15 @@  int conf_read_simple(const char *name, int def)
 		if (in)
 			goto load;
 		sym_add_change_count(1);
-		if (!sym_defconfig_list) {
-			sym_calc_value(modules_sym);
+		if (!sym_defconfig_list)
 			return 1;
-		}
 
 		for_all_defaults(sym_defconfig_list, prop) {
 			if (expr_calc_value(prop->visible.expr) == no ||
 			    prop->expr->type != E_SYMBOL)
 				continue;
-			name = conf_expand_value(prop->expr->left.sym->name);
+			sym_calc_value(prop->expr->left.sym);
+			name = sym_get_string_value(prop->expr->left.sym);
 			in = zconf_fopen(name);
 			if (in) {
 				conf_message("using defaults found in %s",
@@ -292,7 +390,6 @@  int conf_read_simple(const char *name, int def)
 	conf_filename = name;
 	conf_lineno = 0;
 	conf_warnings = 0;
-	conf_unsaved = 0;
 
 	def_flags = SYMBOL_DEF << def;
 	for_all_symbols(i, sym) {
@@ -329,7 +426,7 @@  int conf_read_simple(const char *name, int def)
 				sym = sym_find(line + 2 + strlen(CONFIG_));
 				if (!sym) {
 					sym_add_change_count(1);
-					goto setsym;
+					continue;
 				}
 			} else {
 				sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
@@ -359,17 +456,22 @@  int conf_read_simple(const char *name, int def)
 				if (*p2 == '\r')
 					*p2 = 0;
 			}
-			if (def == S_DEF_USER) {
-				sym = sym_find(line + strlen(CONFIG_));
-				if (!sym) {
+
+			sym = sym_find(line + strlen(CONFIG_));
+			if (!sym) {
+				if (def == S_DEF_AUTO)
+					/*
+					 * Reading from include/config/auto.conf
+					 * If CONFIG_FOO previously existed in
+					 * auto.conf but it is missing now,
+					 * include/config/foo.h must be touched.
+					 */
+					conf_touch_dep(line + strlen(CONFIG_));
+				else
 					sym_add_change_count(1);
-					goto setsym;
-				}
-			} else {
-				sym = sym_lookup(line + strlen(CONFIG_), 0);
-				if (sym->type == S_UNKNOWN)
-					sym->type = S_OTHER;
+				continue;
 			}
+
 			if (sym->flags & def_flags) {
 				conf_warning("override: reassigning to symbol %s", sym->name);
 			}
@@ -377,10 +479,12 @@  int conf_read_simple(const char *name, int def)
 				continue;
 		} else {
 			if (line[0] != '\r' && line[0] != '\n')
-				conf_warning("unexpected data");
+				conf_warning("unexpected data: %.*s",
+					     (int)strcspn(line, "\r\n"), line);
+
 			continue;
 		}
-setsym:
+
 		if (sym && sym_is_choice_value(sym)) {
 			struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 			switch (sym->def[def].tri) {
@@ -403,34 +507,36 @@  int conf_read_simple(const char *name, int def)
 	}
 	free(line);
 	fclose(in);
-	sym_calc_value(modules_sym);
 	return 0;
 }
 
 int conf_read(const char *name)
 {
 	struct symbol *sym;
+	int conf_unsaved = 0;
 	int i;
 
 	sym_set_change_count(0);
 
-	if (conf_read_simple(name, S_DEF_USER))
+	if (conf_read_simple(name, S_DEF_USER)) {
+		sym_calc_value(modules_sym);
 		return 1;
+	}
+
+	sym_calc_value(modules_sym);
 
 	for_all_symbols(i, sym) {
 		sym_calc_value(sym);
-		if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
+		if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
 			continue;
 		if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 			/* check that calculated value agrees with saved value */
 			switch (sym->type) {
 			case S_BOOLEAN:
 			case S_TRISTATE:
-				if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
-					break;
-				if (!sym_is_choice(sym))
+				if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
 					continue;
-				/* fall through */
+				break;
 			default:
 				if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 					continue;
@@ -629,7 +735,6 @@  static void conf_write_symbol(FILE *fp, struct symbol *sym,
 	const char *str;
 
 	switch (sym->type) {
-	case S_OTHER:
 	case S_UNKNOWN:
 		break;
 	case S_STRING:
@@ -689,7 +794,7 @@  int conf_write_defconfig(const char *filename)
 				goto next_menu;
 			sym->flags &= ~SYMBOL_WRITE;
 			/* If we cannot change the symbol - skip */
-			if (!sym_is_changable(sym))
+			if (!sym_is_changeable(sym))
 				goto next_menu;
 			/* If symbol equals to default value - skip */
 			if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
@@ -740,41 +845,36 @@  int conf_write(const char *name)
 	FILE *out;
 	struct symbol *sym;
 	struct menu *menu;
-	const char *basename;
 	const char *str;
-	char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
+	char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
 	char *env;
+	int i;
+	bool need_newline = false;
+
+	if (!name)
+		name = conf_get_configname();
+
+	if (!*name) {
+		fprintf(stderr, "config name is empty\n");
+		return -1;
+	}
+
+	if (is_dir(name)) {
+		fprintf(stderr, "%s: Is a directory\n", name);
+		return -1;
+	}
+
+	if (make_parent_dir(name))
+		return -1;
 
-	dirname[0] = 0;
-	if (name && name[0]) {
-		struct stat st;
-		char *slash;
-
-		if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
-			strcpy(dirname, name);
-			strcat(dirname, "/");
-			basename = conf_get_configname();
-		} else if ((slash = strrchr(name, '/'))) {
-			int size = slash - name + 1;
-			memcpy(dirname, name, size);
-			dirname[size] = 0;
-			if (slash[1])
-				basename = slash + 1;
-			else
-				basename = conf_get_configname();
-		} else
-			basename = name;
-	} else
-		basename = conf_get_configname();
-
-	sprintf(newname, "%s%s", dirname, basename);
 	env = getenv("KCONFIG_OVERWRITECONFIG");
-	if (!env || !*env) {
-		sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
-		out = fopen(tmpname, "w");
-	} else {
+	if (env && *env) {
 		*tmpname = 0;
-		out = fopen(newname, "w");
+		out = fopen(name, "w");
+	} else {
+		snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
+			 name, (int)getpid());
+		out = fopen(tmpname, "w");
 	}
 	if (!out)
 		return 1;
@@ -795,12 +895,17 @@  int conf_write(const char *name)
 				     "#\n"
 				     "# %s\n"
 				     "#\n", str);
-		} else if (!(sym->flags & SYMBOL_CHOICE)) {
+			need_newline = false;
+		} else if (!(sym->flags & SYMBOL_CHOICE) &&
+			   !(sym->flags & SYMBOL_WRITTEN)) {
 			sym_calc_value(sym);
 			if (!(sym->flags & SYMBOL_WRITE))
 				goto next;
-			sym->flags &= ~SYMBOL_WRITE;
-
+			if (need_newline) {
+				fprintf(out, "\n");
+				need_newline = false;
+			}
+			sym->flags |= SYMBOL_WRITTEN;
 			conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 		}
 
@@ -812,6 +917,12 @@  int conf_write(const char *name)
 		if (menu->next)
 			menu = menu->next;
 		else while ((menu = menu->parent)) {
+			if (!menu->sym && menu_is_visible(menu) &&
+			    menu != &rootmenu) {
+				str = menu_get_prompt(menu);
+				fprintf(out, "# end of %s\n", str);
+				need_newline = true;
+			}
 			if (menu->next) {
 				menu = menu->next;
 				break;
@@ -820,40 +931,76 @@  int conf_write(const char *name)
 	}
 	fclose(out);
 
+	for_all_symbols(i, sym)
+		sym->flags &= ~SYMBOL_WRITTEN;
+
 	if (*tmpname) {
-		strcat(dirname, basename);
-		strcat(dirname, ".old");
-		rename(newname, dirname);
-		if (rename(tmpname, newname))
+		if (is_same(name, tmpname)) {
+			conf_message("No change to %s", name);
+			unlink(tmpname);
+			sym_set_change_count(0);
+			return 0;
+		}
+
+		snprintf(oldname, sizeof(oldname), "%s.old", name);
+		rename(name, oldname);
+		if (rename(tmpname, name))
 			return 1;
 	}
 
-	conf_message("configuration written to %s", newname);
+	conf_message("configuration written to %s", name);
 
 	sym_set_change_count(0);
 
 	return 0;
 }
 
-static int conf_split_config(void)
+/* write a dependency file as used by kbuild to track dependencies */
+static int conf_write_dep(const char *name)
+{
+	struct file *file;
+	FILE *out;
+
+	out = fopen("..config.tmp", "w");
+	if (!out)
+		return 1;
+	fprintf(out, "deps_config := \\\n");
+	for (file = file_list; file; file = file->next) {
+		if (file->next)
+			fprintf(out, "\t%s \\\n", file->name);
+		else
+			fprintf(out, "\t%s\n", file->name);
+	}
+	fprintf(out, "\n%s: \\\n"
+		     "\t$(deps_config)\n\n", conf_get_autoconfig_name());
+
+	env_write_dep(out, conf_get_autoconfig_name());
+
+	fprintf(out, "\n$(deps_config): ;\n");
+	fclose(out);
+
+	if (make_parent_dir(name))
+		return 1;
+	rename("..config.tmp", name);
+	return 0;
+}
+
+static int conf_touch_deps(void)
 {
 	const char *name;
-	char path[PATH_MAX+1];
-	char *s, *d, c;
 	struct symbol *sym;
-	struct stat sb;
-	int res, i, fd;
+	int res, i;
+
+	strcpy(depfile_path, "include/config/");
+	depfile_prefix_len = strlen(depfile_path);
 
 	name = conf_get_autoconfig_name();
 	conf_read_simple(name, S_DEF_AUTO);
+	sym_calc_value(modules_sym);
 
-	if (chdir("include/config"))
-		return 1;
-
-	res = 0;
 	for_all_symbols(i, sym) {
 		sym_calc_value(sym);
-		if ((sym->flags & SYMBOL_AUTO) || !sym->name)
+		if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
 			continue;
 		if (sym->flags & SYMBOL_WRITE) {
 			if (sym->flags & SYMBOL_DEF_AUTO) {
@@ -902,63 +1049,28 @@  static int conf_split_config(void)
 		 *	different from 'no').
 		 */
 
-		/* Replace all '_' and append ".h" */
-		s = sym->name;
-		d = path;
-		while ((c = *s++)) {
-			c = tolower(c);
-			*d++ = (c == '_') ? '/' : c;
-		}
-		strcpy(d, ".h");
-
-		/* Assume directory path already exists. */
-		fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-		if (fd == -1) {
-			if (errno != ENOENT) {
-				res = 1;
-				break;
-			}
-			/*
-			 * Create directory components,
-			 * unless they exist already.
-			 */
-			d = path;
-			while ((d = strchr(d, '/'))) {
-				*d = 0;
-				if (stat(path, &sb) && mkdir(path, 0755)) {
-					res = 1;
-					goto out;
-				}
-				*d++ = '/';
-			}
-			/* Try it again. */
-			fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-			if (fd == -1) {
-				res = 1;
-				break;
-			}
-		}
-		close(fd);
+		res = conf_touch_dep(sym->name);
+		if (res)
+			return res;
 	}
-out:
-	if (chdir("../.."))
-		return 1;
 
-	return res;
+	return 0;
 }
 
-int conf_write_autoconf(void)
+int conf_write_autoconf(int overwrite)
 {
 	struct symbol *sym;
 	const char *name;
+	const char *autoconf_name = conf_get_autoconfig_name();
 	FILE *out, *tristate, *out_h;
 	int i;
 
-	sym_clear_all_valid();
+	if (!overwrite && is_present(autoconf_name))
+		return 0;
 
-	file_write_dep("include/config/auto.conf.cmd");
+	conf_write_dep("include/config/auto.conf.cmd");
 
-	if (conf_split_config())
+	if (conf_touch_deps())
 		return 1;
 
 	out = fopen(".tmpconfig", "w");
@@ -1003,19 +1115,26 @@  int conf_write_autoconf(void)
 	name = getenv("KCONFIG_AUTOHEADER");
 	if (!name)
 		name = "include/generated/autoconf.h";
+	if (make_parent_dir(name))
+		return 1;
 	if (rename(".tmpconfig.h", name))
 		return 1;
+
 	name = getenv("KCONFIG_TRISTATE");
 	if (!name)
 		name = "include/config/tristate.conf";
+	if (make_parent_dir(name))
+		return 1;
 	if (rename(".tmpconfig_tristate", name))
 		return 1;
-	name = conf_get_autoconfig_name();
+
+	if (make_parent_dir(autoconf_name))
+		return 1;
 	/*
 	 * This must be the last step, kbuild has a dependency on auto.conf
 	 * and this marks the successful completion of the previous steps.
 	 */
-	if (rename(".tmpconfig", name))
+	if (rename(".tmpconfig", autoconf_name))
 		return 1;
 
 	return 0;
@@ -1119,7 +1238,7 @@  void set_all_choice_values(struct symbol *csym)
 bool conf_set_all_new_symbols(enum conf_def_mode mode)
 {
 	struct symbol *sym, *csym;
-	int i, cnt, pby, pty, ptm;	/* pby: probability of boolean  = y
+	int i, cnt, pby, pty, ptm;	/* pby: probability of bool     = y
 					 * pty: probability of tristate = y
 					 * ptm: probability of tristate = m
 					 */
diff --git a/xen/tools/kconfig/expr.c b/xen/tools/kconfig/expr.c
index 667d1aa23711..77ffff3a053c 100644
--- a/xen/tools/kconfig/expr.c
+++ b/xen/tools/kconfig/expr.c
@@ -1,8 +1,10 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
+#include <ctype.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -94,7 +96,7 @@  struct expr *expr_copy(const struct expr *org)
 		e->right.expr = expr_copy(org->right.expr);
 		break;
 	default:
-		printf("can't copy type %d\n", e->type);
+		fprintf(stderr, "can't copy type %d\n", e->type);
 		free(e);
 		e = NULL;
 		break;
@@ -113,7 +115,7 @@  void expr_free(struct expr *e)
 		break;
 	case E_NOT:
 		expr_free(e->left.expr);
-		return;
+		break;
 	case E_EQUAL:
 	case E_GEQ:
 	case E_GTH:
@@ -127,7 +129,7 @@  void expr_free(struct expr *e)
 		expr_free(e->right.expr);
 		break;
 	default:
-		printf("how to free type %d?\n", e->type);
+		fprintf(stderr, "how to free type %d?\n", e->type);
 		break;
 	}
 	free(e);
@@ -138,8 +140,18 @@  static int trans_count;
 #define e1 (*ep1)
 #define e2 (*ep2)
 
+/*
+ * expr_eliminate_eq() helper.
+ *
+ * Walks the two expression trees given in 'ep1' and 'ep2'. Any node that does
+ * not have type 'type' (E_OR/E_AND) is considered a leaf, and is compared
+ * against all other leaves. Two equal leaves are both replaced with either 'y'
+ * or 'n' as appropriate for 'type', to be eliminated later.
+ */
 static void __expr_eliminate_eq(enum expr_type type, struct expr **ep1, struct expr **ep2)
 {
+	/* Recurse down to leaves */
+
 	if (e1->type == type) {
 		__expr_eliminate_eq(type, &e1->left.expr, &e2);
 		__expr_eliminate_eq(type, &e1->right.expr, &e2);
@@ -150,12 +162,18 @@  static void __expr_eliminate_eq(enum expr_type type, struct expr **ep1, struct e
 		__expr_eliminate_eq(type, &e1, &e2->right.expr);
 		return;
 	}
+
+	/* e1 and e2 are leaves. Compare them. */
+
 	if (e1->type == E_SYMBOL && e2->type == E_SYMBOL &&
 	    e1->left.sym == e2->left.sym &&
 	    (e1->left.sym == &symbol_yes || e1->left.sym == &symbol_no))
 		return;
 	if (!expr_eq(e1, e2))
 		return;
+
+	/* e1 and e2 are equal leaves. Prepare them for elimination. */
+
 	trans_count++;
 	expr_free(e1); expr_free(e2);
 	switch (type) {
@@ -172,6 +190,35 @@  static void __expr_eliminate_eq(enum expr_type type, struct expr **ep1, struct e
 	}
 }
 
+/*
+ * Rewrites the expressions 'ep1' and 'ep2' to remove operands common to both.
+ * Example reductions:
+ *
+ *	ep1: A && B           ->  ep1: y
+ *	ep2: A && B && C      ->  ep2: C
+ *
+ *	ep1: A || B           ->  ep1: n
+ *	ep2: A || B || C      ->  ep2: C
+ *
+ *	ep1: A && (B && FOO)  ->  ep1: FOO
+ *	ep2: (BAR && B) && A  ->  ep2: BAR
+ *
+ *	ep1: A && (B || C)    ->  ep1: y
+ *	ep2: (C || B) && A    ->  ep2: y
+ *
+ * Comparisons are done between all operands at the same "level" of && or ||.
+ * For example, in the expression 'e1 && (e2 || e3) && (e4 || e5)', the
+ * following operands will be compared:
+ *
+ *	- 'e1', 'e2 || e3', and 'e4 || e5', against each other
+ *	- e2 against e3
+ *	- e4 against e5
+ *
+ * Parentheses are irrelevant within a single level. 'e1 && (e2 && e3)' and
+ * '(e1 && e2) && e3' are both a single level.
+ *
+ * See __expr_eliminate_eq() as well.
+ */
 void expr_eliminate_eq(struct expr **ep1, struct expr **ep2)
 {
 	if (!e1 || !e2)
@@ -197,6 +244,12 @@  void expr_eliminate_eq(struct expr **ep1, struct expr **ep2)
 #undef e1
 #undef e2
 
+/*
+ * Returns true if 'e1' and 'e2' are equal, after minor simplification. Two
+ * &&/|| expressions are considered equal if every operand in one expression
+ * equals some operand in the other (operands do not need to appear in the same
+ * order), recursively.
+ */
 static int expr_eq(struct expr *e1, struct expr *e2)
 {
 	int res, old_count;
@@ -243,6 +296,17 @@  static int expr_eq(struct expr *e1, struct expr *e2)
 	return 0;
 }
 
+/*
+ * Recursively performs the following simplifications in-place (as well as the
+ * corresponding simplifications with swapped operands):
+ *
+ *	expr && n  ->  n
+ *	expr && y  ->  expr
+ *	expr || n  ->  expr
+ *	expr || y  ->  y
+ *
+ * Returns the optimized expression.
+ */
 static struct expr *expr_eliminate_yn(struct expr *e)
 {
 	struct expr *tmp;
@@ -516,12 +580,21 @@  static struct expr *expr_join_and(struct expr *e1, struct expr *e2)
 	return NULL;
 }
 
+/*
+ * expr_eliminate_dups() helper.
+ *
+ * Walks the two expression trees given in 'ep1' and 'ep2'. Any node that does
+ * not have type 'type' (E_OR/E_AND) is considered a leaf, and is compared
+ * against all other leaves to look for simplifications.
+ */
 static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct expr **ep2)
 {
 #define e1 (*ep1)
 #define e2 (*ep2)
 	struct expr *tmp;
 
+	/* Recurse down to leaves */
+
 	if (e1->type == type) {
 		expr_eliminate_dups1(type, &e1->left.expr, &e2);
 		expr_eliminate_dups1(type, &e1->right.expr, &e2);
@@ -532,6 +605,9 @@  static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct
 		expr_eliminate_dups1(type, &e1, &e2->right.expr);
 		return;
 	}
+
+	/* e1 and e2 are leaves. Compare and process them. */
+
 	if (e1 == e2)
 		return;
 
@@ -568,6 +644,17 @@  static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct
 #undef e2
 }
 
+/*
+ * Rewrites 'e' in-place to remove ("join") duplicate and other redundant
+ * operands.
+ *
+ * Example simplifications:
+ *
+ *	A || B || A    ->  A || B
+ *	A && B && A=y  ->  A=y && B
+ *
+ * Returns the deduplicated expression.
+ */
 struct expr *expr_eliminate_dups(struct expr *e)
 {
 	int oldcount;
@@ -584,6 +671,7 @@  struct expr *expr_eliminate_dups(struct expr *e)
 			;
 		}
 		if (!trans_count)
+			/* No simplifications done in this pass. We're done */
 			break;
 		e = expr_eliminate_yn(e);
 	}
@@ -591,6 +679,12 @@  struct expr *expr_eliminate_dups(struct expr *e)
 	return e;
 }
 
+/*
+ * Performs various simplifications involving logical operators and
+ * comparisons.
+ *
+ * Allocates and returns a new expression.
+ */
 struct expr *expr_transform(struct expr *e)
 {
 	struct expr *tmp;
@@ -805,6 +899,20 @@  bool expr_depends_symbol(struct expr *dep, struct symbol *sym)
  	return false;
 }
 
+/*
+ * Inserts explicit comparisons of type 'type' to symbol 'sym' into the
+ * expression 'e'.
+ *
+ * Examples transformations for type == E_UNEQUAL, sym == &symbol_no:
+ *
+ *	A              ->  A!=n
+ *	!A             ->  A=n
+ *	A && B         ->  !(A=n || B=n)
+ *	A || B         ->  !(A=n && B=n)
+ *	A && (B || C)  ->  !(A=n || (B=n && C=n))
+ *
+ * Allocates and returns a new expression.
+ */
 struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym)
 {
 	struct expr *e1, *e2;
@@ -874,7 +982,6 @@  enum string_value_kind {
 	k_string,
 	k_signed,
 	k_unsigned,
-	k_invalid
 };
 
 union string_value {
@@ -893,7 +1000,10 @@  static enum string_value_kind expr_parse_string(const char *str,
 	switch (type) {
 	case S_BOOLEAN:
 	case S_TRISTATE:
-		return k_string;
+		val->s = !strcmp(str, "n") ? 0 :
+			 !strcmp(str, "m") ? 1 :
+			 !strcmp(str, "y") ? 2 : -1;
+		return k_signed;
 	case S_INT:
 		val->s = strtoll(str, &tail, 10);
 		kind = k_signed;
@@ -902,13 +1012,10 @@  static enum string_value_kind expr_parse_string(const char *str,
 		val->u = strtoull(str, &tail, 16);
 		kind = k_unsigned;
 		break;
-	case S_STRING:
-	case S_UNKNOWN:
+	default:
 		val->s = strtoll(str, &tail, 0);
 		kind = k_signed;
 		break;
-	default:
-		return k_invalid;
 	}
 	return !errno && !*tail && tail > str && isxdigit(tail[-1])
 	       ? kind : k_string;
@@ -964,13 +1071,7 @@  tristate expr_calc_value(struct expr *e)
 
 	if (k1 == k_string || k2 == k_string)
 		res = strcmp(str1, str2);
-	else if (k1 == k_invalid || k2 == k_invalid) {
-		if (e->type != E_EQUAL && e->type != E_UNEQUAL) {
-			printf("Cannot compare \"%s\" and \"%s\"\n", str1, str2);
-			return no;
-		}
-		res = strcmp(str1, str2);
-	} else if (k1 == k_unsigned || k2 == k_unsigned)
+	else if (k1 == k_unsigned || k2 == k_unsigned)
 		res = (lval.u > rval.u) - (lval.u < rval.u);
 	else /* if (k1 == k_signed && k2 == k_signed) */
 		res = (lval.s > rval.s) - (lval.s < rval.s);
@@ -1028,49 +1129,9 @@  static int expr_compare_type(enum expr_type t1, enum expr_type t2)
 	return 0;
 }
 
-static inline struct expr *
-expr_get_leftmost_symbol(const struct expr *e)
-{
-
-	if (e == NULL)
-		return NULL;
-
-	while (e->type != E_SYMBOL)
-		e = e->left.expr;
-
-	return expr_copy(e);
-}
-
-/*
- * Given expression `e1' and `e2', returns the leaf of the longest
- * sub-expression of `e1' not containing 'e2.
- */
-struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2)
-{
-	struct expr *ret;
-
-	switch (e1->type) {
-	case E_OR:
-		return expr_alloc_and(
-		    expr_simplify_unmet_dep(e1->left.expr, e2),
-		    expr_simplify_unmet_dep(e1->right.expr, e2));
-	case E_AND: {
-		struct expr *e;
-		e = expr_alloc_and(expr_copy(e1), expr_copy(e2));
-		e = expr_eliminate_dups(e);
-		ret = (!expr_eq(e, e1)) ? e1 : NULL;
-		expr_free(e);
-		break;
-		}
-	default:
-		ret = e1;
-		break;
-	}
-
-	return expr_get_leftmost_symbol(ret);
-}
-
-void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken)
+void expr_print(struct expr *e,
+		void (*fn)(void *, struct symbol *, const char *),
+		void *data, int prevtoken)
 {
 	if (!e) {
 		fn(data, NULL, "y");
@@ -1113,7 +1174,7 @@  void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *
 			fn(data, e->left.sym, e->left.sym->name);
 		else
 			fn(data, NULL, "<choice>");
-		fn(data, NULL, e->type == E_LEQ ? ">=" : ">");
+		fn(data, NULL, e->type == E_GEQ ? ">=" : ">");
 		fn(data, e->right.sym, e->right.sym->name);
 		break;
 	case E_UNEQUAL:
@@ -1204,3 +1265,33 @@  void expr_gstr_print(struct expr *e, struct gstr *gs)
 {
 	expr_print(e, expr_print_gstr_helper, gs, E_NONE);
 }
+
+/*
+ * Transform the top level "||" tokens into newlines and prepend each
+ * line with a minus. This makes expressions much easier to read.
+ * Suitable for reverse dependency expressions.
+ */
+static void expr_print_revdep(struct expr *e,
+			      void (*fn)(void *, struct symbol *, const char *),
+			      void *data, tristate pr_type, const char **title)
+{
+	if (e->type == E_OR) {
+		expr_print_revdep(e->left.expr, fn, data, pr_type, title);
+		expr_print_revdep(e->right.expr, fn, data, pr_type, title);
+	} else if (expr_calc_value(e) == pr_type) {
+		if (*title) {
+			fn(data, NULL, *title);
+			*title = NULL;
+		}
+
+		fn(data, NULL, "  - ");
+		expr_print(e, fn, data, E_NONE);
+		fn(data, NULL, "\n");
+	}
+}
+
+void expr_gstr_print_revdep(struct expr *e, struct gstr *gs,
+			    tristate pr_type, const char *title)
+{
+	expr_print_revdep(e, expr_print_gstr_helper, gs, pr_type, &title);
+}
diff --git a/xen/tools/kconfig/expr.h b/xen/tools/kconfig/expr.h
index 973b6f733368..017843c9a4f4 100644
--- a/xen/tools/kconfig/expr.h
+++ b/xen/tools/kconfig/expr.h
@@ -1,6 +1,6 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #ifndef EXPR_H
@@ -62,7 +62,7 @@  struct symbol_value {
 };
 
 enum symbol_type {
-	S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
+	S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING
 };
 
 /* enum values are used as index to symbol.def[] */
@@ -74,20 +74,64 @@  enum {
 	S_DEF_COUNT
 };
 
+/*
+ * Represents a configuration symbol.
+ *
+ * Choices are represented as a special kind of symbol and have the
+ * SYMBOL_CHOICE bit set in 'flags'.
+ */
 struct symbol {
+	/* The next symbol in the same bucket in the symbol hash table */
 	struct symbol *next;
+
+	/* The name of the symbol, e.g. "FOO" for 'config FOO' */
 	char *name;
+
+	/* S_BOOLEAN, S_TRISTATE, ... */
 	enum symbol_type type;
+
+	/*
+	 * The calculated value of the symbol. The SYMBOL_VALID bit is set in
+	 * 'flags' when this is up to date. Note that this value might differ
+	 * from the user value set in e.g. a .config file, due to visibility.
+	 */
 	struct symbol_value curr;
+
+	/*
+	 * Values for the symbol provided from outside. def[S_DEF_USER] holds
+	 * the .config value.
+	 */
 	struct symbol_value def[S_DEF_COUNT];
+
+	/*
+	 * An upper bound on the tristate value the user can set for the symbol
+	 * if it is a boolean or tristate. Calculated from prompt dependencies,
+	 * which also inherit dependencies from enclosing menus, choices, and
+	 * ifs. If 'n', the user value will be ignored.
+	 *
+	 * Symbols lacking prompts always have visibility 'n'.
+	 */
 	tristate visible;
+
+	/* SYMBOL_* flags */
 	int flags;
+
+	/* List of properties. See prop_type. */
 	struct property *prop;
+
+	/* Dependencies from enclosing menus, choices, and ifs */
 	struct expr_value dir_dep;
+
+	/* Reverse dependencies through being selected by other symbols */
 	struct expr_value rev_dep;
+
+	/*
+	 * "Weak" reverse dependencies through being implied by other symbols
+	 */
+	struct expr_value implied;
 };
 
-#define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next) if (sym->type != S_OTHER)
+#define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next)
 
 #define SYMBOL_CONST      0x0001  /* symbol is const */
 #define SYMBOL_CHECK      0x0008  /* used during dependency checking */
@@ -97,7 +141,8 @@  struct symbol {
 #define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
 #define SYMBOL_WRITE      0x0200  /* write symbol to file (KCONFIG_CONFIG) */
 #define SYMBOL_CHANGED    0x0400  /* ? */
-#define SYMBOL_AUTO       0x1000  /* value from environment variable */
+#define SYMBOL_WRITTEN    0x0800  /* track info to avoid double-write to .config */
+#define SYMBOL_NO_WRITE   0x1000  /* Symbol for internal use only; it will not be written */
 #define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
 #define SYMBOL_WARNED     0x8000  /* warning has been issued */
 
@@ -127,17 +172,20 @@  struct symbol {
  * config BAZ
  *         int "BAZ Value"
  *         range 1..255
+ *
+ * Please, also check parser.y:print_symbol() when modifying the
+ * list of property types!
  */
 enum prop_type {
 	P_UNKNOWN,
 	P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */
 	P_COMMENT,  /* text associated with a comment */
-	P_MENU,     /* prompt associated with a menuconfig option */
+	P_MENU,     /* prompt associated with a menu or menuconfig symbol */
 	P_DEFAULT,  /* default y */
 	P_CHOICE,   /* choice value */
 	P_SELECT,   /* select BAR */
+	P_IMPLY,    /* imply BAR */
 	P_RANGE,    /* range 7..100 (for a symbol) */
-	P_ENV,      /* value from environment variable */
 	P_SYMBOL,   /* where a symbol is defined */
 };
 
@@ -164,22 +212,67 @@  struct property {
 	for (st = sym->prop; st; st = st->next) \
 		if (st->text)
 
+/*
+ * Represents a node in the menu tree, as seen in e.g. menuconfig (though used
+ * for all front ends). Each symbol, menu, etc. defined in the Kconfig files
+ * gets a node. A symbol defined in multiple locations gets one node at each
+ * location.
+ */
 struct menu {
+	/* The next menu node at the same level */
 	struct menu *next;
+
+	/* The parent menu node, corresponding to e.g. a menu or choice */
 	struct menu *parent;
+
+	/* The first child menu node, for e.g. menus and choices */
 	struct menu *list;
+
+	/*
+	 * The symbol associated with the menu node. Choices are implemented as
+	 * a special kind of symbol. NULL for menus, comments, and ifs.
+	 */
 	struct symbol *sym;
+
+	/*
+	 * The prompt associated with the node. This holds the prompt for a
+	 * symbol as well as the text for a menu or comment, along with the
+	 * type (P_PROMPT, P_MENU, etc.)
+	 */
 	struct property *prompt;
+
+	/*
+	 * 'visible if' dependencies. If more than one is given, they will be
+	 * ANDed together.
+	 */
 	struct expr *visibility;
+
+	/*
+	 * Ordinary dependencies from e.g. 'depends on' and 'if', ANDed
+	 * together
+	 */
 	struct expr *dep;
+
+	/* MENU_* flags */
 	unsigned int flags;
+
+	/* Any help text associated with the node */
 	char *help;
+
+	/* The location where the menu node appears in the Kconfig files */
 	struct file *file;
 	int lineno;
+
+	/* For use by front ends that need to store auxiliary data */
 	void *data;
 };
 
+/*
+ * Set on a menu node when the corresponding symbol changes state in some way.
+ * Can be checked by front ends.
+ */
 #define MENU_CHANGED		0x0001
+
 #define MENU_ROOT		0x0002
 
 struct jump_key {
@@ -215,11 +308,12 @@  struct expr *expr_transform(struct expr *e);
 int expr_contains_symbol(struct expr *dep, struct symbol *sym);
 bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
 struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
-struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2);
 
 void expr_fprint(struct expr *e, FILE *out);
 struct gstr; /* forward */
 void expr_gstr_print(struct expr *e, struct gstr *gs);
+void expr_gstr_print_revdep(struct expr *e, struct gstr *gs,
+			    tristate pr_type, const char *title);
 
 static inline int expr_is_yes(struct expr *e)
 {
diff --git a/xen/tools/kconfig/gconf-cfg.sh b/xen/tools/kconfig/gconf-cfg.sh
new file mode 100755
index 000000000000..480ecd8b9f41
--- /dev/null
+++ b/xen/tools/kconfig/gconf-cfg.sh
@@ -0,0 +1,30 @@ 
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+PKG="gtk+-2.0 gmodule-2.0 libglade-2.0"
+
+if [ -z "$(command -v pkg-config)" ]; then
+	echo >&2 "*"
+	echo >&2 "* 'make gconfig' requires 'pkg-config'. Please install it."
+	echo >&2 "*"
+	exit 1
+fi
+
+if ! pkg-config --exists $PKG; then
+	echo >&2 "*"
+	echo >&2 "* Unable to find the GTK+ installation. Please make sure that"
+	echo >&2 "* the GTK+ 2.0 development package is correctly installed."
+	echo >&2 "* You need $PKG"
+	echo >&2 "*"
+	exit 1
+fi
+
+if ! pkg-config --atleast-version=2.0.0 gtk+-2.0; then
+	echo >&2 "*"
+	echo >&2 "* GTK+ is present but version >= 2.0.0 is required."
+	echo >&2 "*"
+	exit 1
+fi
+
+echo cflags=\"$(pkg-config --cflags $PKG)\"
+echo libs=\"$(pkg-config --libs $PKG)\"
diff --git a/xen/tools/kconfig/gconf.c b/xen/tools/kconfig/gconf.c
index 405178769103..e36b342f1065 100644
--- a/xen/tools/kconfig/gconf.c
+++ b/xen/tools/kconfig/gconf.c
@@ -1,9 +1,6 @@ 
-/* Hey EMACS -*- linux-c -*- */
+// SPDX-License-Identifier: GPL-2.0
 /*
- *
  * Copyright (C) 2002-2003 Romain Lievin <roms@tilp.info>
- * Released under the terms of the GNU GPL v2.0.
- *
  */
 
 #ifdef HAVE_CONFIG_H
@@ -12,7 +9,7 @@ 
 
 #include <stdlib.h>
 #include "lkc.h"
-#include "images.c"
+#include "images.h"
 
 #include <glade/glade.h>
 #include <gtk/gtk.h>
@@ -78,8 +75,8 @@  static gchar **fill_row(struct menu *menu);
 static void conf_changed(void);
 
 /* Helping/Debugging Functions */
-
-const char *dbg_sym_flags(int val)
+#ifdef DEBUG
+static const char *dbg_sym_flags(int val)
 {
 	static char buf[256];
 
@@ -101,16 +98,17 @@  const char *dbg_sym_flags(int val)
 		strcat(buf, "write/");
 	if (val & SYMBOL_CHANGED)
 		strcat(buf, "changed/");
-	if (val & SYMBOL_AUTO)
-		strcat(buf, "auto/");
+	if (val & SYMBOL_NO_WRITE)
+		strcat(buf, "no_write/");
 
 	buf[strlen(buf) - 1] = '\0';
 
 	return buf;
 }
+#endif
 
-void replace_button_icon(GladeXML * xml, GdkDrawable * window,
-			 GtkStyle * style, gchar * btn_name, gchar ** xpm)
+static void replace_button_icon(GladeXML *xml, GdkDrawable *window,
+				GtkStyle *style, gchar *btn_name, gchar **xpm)
 {
 	GdkPixmap *pixmap;
 	GdkBitmap *mask;
@@ -128,7 +126,7 @@  void replace_button_icon(GladeXML * xml, GdkDrawable * window,
 }
 
 /* Main Window Initialization */
-void init_main_window(const gchar * glade_file)
+static void init_main_window(const gchar *glade_file)
 {
 	GladeXML *xml;
 	GtkWidget *widget;
@@ -190,7 +188,7 @@  void init_main_window(const gchar * glade_file)
 	gtk_widget_show(main_wnd);
 }
 
-void init_tree_model(void)
+static void init_tree_model(void)
 {
 	gint i;
 
@@ -220,7 +218,7 @@  void init_tree_model(void)
 	model1 = GTK_TREE_MODEL(tree1);
 }
 
-void init_left_tree(void)
+static void init_left_tree(void)
 {
 	GtkTreeView *view = GTK_TREE_VIEW(tree1_w);
 	GtkCellRenderer *renderer;
@@ -262,7 +260,7 @@  static void renderer_edited(GtkCellRendererText * cell,
 			    const gchar * path_string,
 			    const gchar * new_text, gpointer user_data);
 
-void init_right_tree(void)
+static void init_right_tree(void)
 {
 	GtkTreeView *view = GTK_TREE_VIEW(tree2_w);
 	GtkCellRenderer *renderer;
@@ -525,6 +523,7 @@  void on_save_activate(GtkMenuItem * menuitem, gpointer user_data)
 {
 	if (conf_write(NULL))
 		text_insert_msg("Error", "Unable to save configuration !");
+	conf_write_autoconf(0);
 }
 
 
@@ -639,7 +638,7 @@  on_set_option_mode3_activate(GtkMenuItem *menuitem, gpointer user_data)
 void on_introduction1_activate(GtkMenuItem * menuitem, gpointer user_data)
 {
 	GtkWidget *dialog;
-	const gchar *intro_text = 
+	const gchar *intro_text =
 	    "Welcome to gkc, the GTK+ graphical configuration tool\n"
 	    "For each option, a blank box indicates the feature is disabled, a\n"
 	    "check indicates it is enabled, and a dot indicates that it is to\n"
@@ -914,7 +913,7 @@  on_treeview2_button_press_event(GtkWidget * widget,
 			current = menu;
 			display_tree_part();
 			gtk_widget_set_sensitive(back_btn, TRUE);
-		} else if ((col == COL_OPTION)) {
+		} else if (col == COL_OPTION) {
 			toggle_sym_value(menu);
 			gtk_tree_view_expand_row(view, path, TRUE);
 		}
@@ -1211,8 +1210,8 @@  static GtkTreeIter found;
 /*
  * Find a menu in the GtkTree starting at parent.
  */
-GtkTreeIter *gtktree_iter_find_node(GtkTreeIter * parent,
-				    struct menu *tofind)
+static GtkTreeIter *gtktree_iter_find_node(GtkTreeIter *parent,
+					   struct menu *tofind)
 {
 	GtkTreeIter iter;
 	GtkTreeIter *child = &iter;
@@ -1423,7 +1422,7 @@  static void display_list(void)
 	tree = tree2;
 }
 
-void fixup_rootmenu(struct menu *menu)
+static void fixup_rootmenu(struct menu *menu)
 {
 	struct menu *child;
 	static int menu_cnt = 0;
diff --git a/xen/tools/kconfig/images.c b/xen/tools/kconfig/images.c
index d4f84bd4a96b..b4fa0e4a63a5 100644
--- a/xen/tools/kconfig/images.c
+++ b/xen/tools/kconfig/images.c
@@ -1,9 +1,11 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
-static const char *xpm_load[] = {
+#include "images.h"
+
+const char *xpm_load[] = {
 "22 22 5 1",
 ". c None",
 "# c #000000",
@@ -33,7 +35,7 @@  static const char *xpm_load[] = {
 "###############.......",
 "......................"};
 
-static const char *xpm_save[] = {
+const char *xpm_save[] = {
 "22 22 5 1",
 ". c None",
 "# c #000000",
@@ -63,7 +65,7 @@  static const char *xpm_save[] = {
 "..##################..",
 "......................"};
 
-static const char *xpm_back[] = {
+const char *xpm_back[] = {
 "22 22 3 1",
 ". c None",
 "# c #000083",
@@ -91,7 +93,7 @@  static const char *xpm_back[] = {
 "......................",
 "......................"};
 
-static const char *xpm_tree_view[] = {
+const char *xpm_tree_view[] = {
 "22 22 2 1",
 ". c None",
 "# c #000000",
@@ -118,7 +120,7 @@  static const char *xpm_tree_view[] = {
 "......................",
 "......................"};
 
-static const char *xpm_single_view[] = {
+const char *xpm_single_view[] = {
 "22 22 2 1",
 ". c None",
 "# c #000000",
@@ -145,7 +147,7 @@  static const char *xpm_single_view[] = {
 "......................",
 "......................"};
 
-static const char *xpm_split_view[] = {
+const char *xpm_split_view[] = {
 "22 22 2 1",
 ". c None",
 "# c #000000",
@@ -172,7 +174,7 @@  static const char *xpm_split_view[] = {
 "......................",
 "......................"};
 
-static const char *xpm_symbol_no[] = {
+const char *xpm_symbol_no[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -189,7 +191,7 @@  static const char *xpm_symbol_no[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_symbol_mod[] = {
+const char *xpm_symbol_mod[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -206,7 +208,7 @@  static const char *xpm_symbol_mod[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_symbol_yes[] = {
+const char *xpm_symbol_yes[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -223,7 +225,7 @@  static const char *xpm_symbol_yes[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_choice_no[] = {
+const char *xpm_choice_no[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -240,7 +242,7 @@  static const char *xpm_choice_no[] = {
 "    ....    ",
 "            "};
 
-static const char *xpm_choice_yes[] = {
+const char *xpm_choice_yes[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -257,7 +259,7 @@  static const char *xpm_choice_yes[] = {
 "    ....    ",
 "            "};
 
-static const char *xpm_menu[] = {
+const char *xpm_menu[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -274,7 +276,7 @@  static const char *xpm_menu[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_menu_inv[] = {
+const char *xpm_menu_inv[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -291,7 +293,7 @@  static const char *xpm_menu_inv[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_menuback[] = {
+const char *xpm_menuback[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -308,7 +310,7 @@  static const char *xpm_menuback[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_void[] = {
+const char *xpm_void[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
diff --git a/xen/tools/kconfig/images.h b/xen/tools/kconfig/images.h
new file mode 100644
index 000000000000..d8ff614bd087
--- /dev/null
+++ b/xen/tools/kconfig/images.h
@@ -0,0 +1,33 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+
+#ifndef IMAGES_H
+#define IMAGES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const char *xpm_load[];
+extern const char *xpm_save[];
+extern const char *xpm_back[];
+extern const char *xpm_tree_view[];
+extern const char *xpm_single_view[];
+extern const char *xpm_split_view[];
+extern const char *xpm_symbol_no[];
+extern const char *xpm_symbol_mod[];
+extern const char *xpm_symbol_yes[];
+extern const char *xpm_choice_no[];
+extern const char *xpm_choice_yes[];
+extern const char *xpm_menu[];
+extern const char *xpm_menu_inv[];
+extern const char *xpm_menuback[];
+extern const char *xpm_void[];
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IMAGES_H */
diff --git a/xen/tools/kconfig/lexer.l b/xen/tools/kconfig/lexer.l
new file mode 100644
index 000000000000..6354c905b006
--- /dev/null
+++ b/xen/tools/kconfig/lexer.l
@@ -0,0 +1,471 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+%option nostdinit noyywrap never-interactive full ecs
+%option 8bit nodefault yylineno
+%x ASSIGN_VAL HELP STRING
+%{
+
+#include <assert.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "lkc.h"
+#include "parser.tab.h"
+
+#define YY_DECL		static int yylex1(void)
+
+#define START_STRSIZE	16
+
+static struct {
+	struct file *file;
+	int lineno;
+} current_pos;
+
+static int prev_prev_token = T_EOL;
+static int prev_token = T_EOL;
+static char *text;
+static int text_size, text_asize;
+
+struct buffer {
+	struct buffer *parent;
+	YY_BUFFER_STATE state;
+};
+
+struct buffer *current_buf;
+
+static int last_ts, first_ts;
+
+static char *expand_token(const char *in, size_t n);
+static void append_expanded_string(const char *in);
+static void zconf_endhelp(void);
+static void zconf_endfile(void);
+
+static void new_string(void)
+{
+	text = xmalloc(START_STRSIZE);
+	text_asize = START_STRSIZE;
+	text_size = 0;
+	*text = 0;
+}
+
+static void append_string(const char *str, int size)
+{
+	int new_size = text_size + size + 1;
+	if (new_size > text_asize) {
+		new_size += START_STRSIZE - 1;
+		new_size &= -START_STRSIZE;
+		text = xrealloc(text, new_size);
+		text_asize = new_size;
+	}
+	memcpy(text + text_size, str, size);
+	text_size += size;
+	text[text_size] = 0;
+}
+
+static void alloc_string(const char *str, int size)
+{
+	text = xmalloc(size + 1);
+	memcpy(text, str, size);
+	text[size] = 0;
+}
+
+static void warn_ignored_character(char chr)
+{
+	fprintf(stderr,
+	        "%s:%d:warning: ignoring unsupported character '%c'\n",
+	        current_file->name, yylineno, chr);
+}
+%}
+
+n	[A-Za-z0-9_-]
+
+%%
+	int str = 0;
+	int ts, i;
+
+#.*			/* ignore comment */
+[ \t]*			/* whitespaces */
+\\\n			/* escaped new line */
+\n			return T_EOL;
+"allnoconfig_y"		return T_ALLNOCONFIG_Y;
+"bool"			return T_BOOL;
+"choice"		return T_CHOICE;
+"comment"		return T_COMMENT;
+"config"		return T_CONFIG;
+"def_bool"		return T_DEF_BOOL;
+"def_tristate"		return T_DEF_TRISTATE;
+"default"		return T_DEFAULT;
+"defconfig_list"	return T_DEFCONFIG_LIST;
+"depends"		return T_DEPENDS;
+"endchoice"		return T_ENDCHOICE;
+"endif"			return T_ENDIF;
+"endmenu"		return T_ENDMENU;
+"help"|"---help---"	return T_HELP;
+"hex"			return T_HEX;
+"if"			return T_IF;
+"imply"			return T_IMPLY;
+"int"			return T_INT;
+"mainmenu"		return T_MAINMENU;
+"menu"			return T_MENU;
+"menuconfig"		return T_MENUCONFIG;
+"modules"		return T_MODULES;
+"on"			return T_ON;
+"option"		return T_OPTION;
+"optional"		return T_OPTIONAL;
+"prompt"		return T_PROMPT;
+"range"			return T_RANGE;
+"select"		return T_SELECT;
+"source"		return T_SOURCE;
+"string"		return T_STRING;
+"tristate"		return T_TRISTATE;
+"visible"		return T_VISIBLE;
+"||"			return T_OR;
+"&&"			return T_AND;
+"="			return T_EQUAL;
+"!="			return T_UNEQUAL;
+"<"			return T_LESS;
+"<="			return T_LESS_EQUAL;
+">"			return T_GREATER;
+">="			return T_GREATER_EQUAL;
+"!"			return T_NOT;
+"("			return T_OPEN_PAREN;
+")"			return T_CLOSE_PAREN;
+":="			return T_COLON_EQUAL;
+"+="			return T_PLUS_EQUAL;
+\"|\'			{
+				str = yytext[0];
+				new_string();
+				BEGIN(STRING);
+			}
+{n}+			{
+				alloc_string(yytext, yyleng);
+				yylval.string = text;
+				return T_WORD;
+			}
+({n}|$)+		{
+				/* this token includes at least one '$' */
+				yylval.string = expand_token(yytext, yyleng);
+				if (strlen(yylval.string))
+					return T_WORD;
+				free(yylval.string);
+			}
+.			warn_ignored_character(*yytext);
+
+<ASSIGN_VAL>{
+	[^[:blank:]\n]+.*	{
+		alloc_string(yytext, yyleng);
+		yylval.string = text;
+		return T_ASSIGN_VAL;
+	}
+	\n	{ BEGIN(INITIAL); return T_EOL; }
+	.
+}
+
+<STRING>{
+	"$".*	append_expanded_string(yytext);
+	[^$'"\\\n]+	{
+		append_string(yytext, yyleng);
+	}
+	\\.?	{
+		append_string(yytext + 1, yyleng - 1);
+	}
+	\'|\"	{
+		if (str == yytext[0]) {
+			BEGIN(INITIAL);
+			yylval.string = text;
+			return T_WORD_QUOTE;
+		} else
+			append_string(yytext, 1);
+	}
+	\n	{
+		fprintf(stderr,
+			"%s:%d:warning: multi-line strings not supported\n",
+			zconf_curname(), zconf_lineno());
+		unput('\n');
+		BEGIN(INITIAL);
+		yylval.string = text;
+		return T_WORD_QUOTE;
+	}
+	<<EOF>>	{
+		BEGIN(INITIAL);
+		yylval.string = text;
+		return T_WORD_QUOTE;
+	}
+}
+
+<HELP>{
+	[ \t]+	{
+		ts = 0;
+		for (i = 0; i < yyleng; i++) {
+			if (yytext[i] == '\t')
+				ts = (ts & ~7) + 8;
+			else
+				ts++;
+		}
+		last_ts = ts;
+		if (first_ts) {
+			if (ts < first_ts) {
+				zconf_endhelp();
+				return T_HELPTEXT;
+			}
+			ts -= first_ts;
+			while (ts > 8) {
+				append_string("        ", 8);
+				ts -= 8;
+			}
+			append_string("        ", ts);
+		}
+	}
+	[ \t]*\n/[^ \t\n] {
+		zconf_endhelp();
+		return T_HELPTEXT;
+	}
+	[ \t]*\n	{
+		append_string("\n", 1);
+	}
+	[^ \t\n].* {
+		while (yyleng) {
+			if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
+				break;
+			yyleng--;
+		}
+		append_string(yytext, yyleng);
+		if (!first_ts)
+			first_ts = last_ts;
+	}
+	<<EOF>>	{
+		zconf_endhelp();
+		return T_HELPTEXT;
+	}
+}
+
+<<EOF>>	{
+	BEGIN(INITIAL);
+
+	if (prev_token != T_EOL && prev_token != T_HELPTEXT)
+		fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
+			current_file->name, yylineno);
+
+	if (current_file) {
+		zconf_endfile();
+		return T_EOL;
+	}
+	fclose(yyin);
+	yyterminate();
+}
+
+%%
+
+/* second stage lexer */
+int yylex(void)
+{
+	int token;
+
+repeat:
+	token = yylex1();
+
+	if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
+		if (token == T_EOL) {
+			/* Do not pass unneeded T_EOL to the parser. */
+			goto repeat;
+		} else {
+			/*
+			 * For the parser, update file/lineno at the first token
+			 * of each statement. Generally, \n is a statement
+			 * terminator in Kconfig, but it is not always true
+			 * because \n could be escaped by a backslash.
+			 */
+			current_pos.file = current_file;
+			current_pos.lineno = yylineno;
+		}
+	}
+
+	if (prev_prev_token == T_EOL && prev_token == T_WORD &&
+	    (token == T_EQUAL || token == T_COLON_EQUAL || token == T_PLUS_EQUAL))
+		BEGIN(ASSIGN_VAL);
+
+	prev_prev_token = prev_token;
+	prev_token = token;
+
+	return token;
+}
+
+static char *expand_token(const char *in, size_t n)
+{
+	char *out;
+	int c;
+	char c2;
+	const char *rest, *end;
+
+	new_string();
+	append_string(in, n);
+
+	/* get the whole line because we do not know the end of token. */
+	while ((c = input()) != EOF) {
+		if (c == '\n') {
+			unput(c);
+			break;
+		}
+		c2 = c;
+		append_string(&c2, 1);
+	}
+
+	rest = text;
+	out = expand_one_token(&rest);
+
+	/* push back unused characters to the input stream */
+	end = rest + strlen(rest);
+	while (end > rest)
+		unput(*--end);
+
+	free(text);
+
+	return out;
+}
+
+static void append_expanded_string(const char *str)
+{
+	const char *end;
+	char *res;
+
+	str++;
+
+	res = expand_dollar(&str);
+
+	/* push back unused characters to the input stream */
+	end = str + strlen(str);
+	while (end > str)
+		unput(*--end);
+
+	append_string(res, strlen(res));
+
+	free(res);
+}
+
+void zconf_starthelp(void)
+{
+	new_string();
+	last_ts = first_ts = 0;
+	BEGIN(HELP);
+}
+
+static void zconf_endhelp(void)
+{
+	yylval.string = text;
+	BEGIN(INITIAL);
+}
+
+
+/*
+ * Try to open specified file with following names:
+ * ./name
+ * $(srctree)/name
+ * The latter is used when srctree is separate from objtree
+ * when compiling the kernel.
+ * Return NULL if file is not found.
+ */
+FILE *zconf_fopen(const char *name)
+{
+	char *env, fullname[PATH_MAX+1];
+	FILE *f;
+
+	f = fopen(name, "r");
+	if (!f && name != NULL && name[0] != '/') {
+		env = getenv(SRCTREE);
+		if (env) {
+			snprintf(fullname, sizeof(fullname),
+				 "%s/%s", env, name);
+			f = fopen(fullname, "r");
+		}
+	}
+	return f;
+}
+
+void zconf_initscan(const char *name)
+{
+	yyin = zconf_fopen(name);
+	if (!yyin) {
+		fprintf(stderr, "can't find file %s\n", name);
+		exit(1);
+	}
+
+	current_buf = xmalloc(sizeof(*current_buf));
+	memset(current_buf, 0, sizeof(*current_buf));
+
+	current_file = file_lookup(name);
+	yylineno = 1;
+}
+
+void zconf_nextfile(const char *name)
+{
+	struct file *iter;
+	struct file *file = file_lookup(name);
+	struct buffer *buf = xmalloc(sizeof(*buf));
+	memset(buf, 0, sizeof(*buf));
+
+	current_buf->state = YY_CURRENT_BUFFER;
+	yyin = zconf_fopen(file->name);
+	if (!yyin) {
+		fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
+			zconf_curname(), zconf_lineno(), file->name);
+		exit(1);
+	}
+	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
+	buf->parent = current_buf;
+	current_buf = buf;
+
+	current_file->lineno = yylineno;
+	file->parent = current_file;
+
+	for (iter = current_file; iter; iter = iter->parent) {
+		if (!strcmp(iter->name, file->name)) {
+			fprintf(stderr,
+				"Recursive inclusion detected.\n"
+				"Inclusion path:\n"
+				"  current file : %s\n", file->name);
+			iter = file;
+			do {
+				iter = iter->parent;
+				fprintf(stderr, "  included from: %s:%d\n",
+					iter->name, iter->lineno - 1);
+			} while (strcmp(iter->name, file->name));
+			exit(1);
+		}
+	}
+
+	yylineno = 1;
+	current_file = file;
+}
+
+static void zconf_endfile(void)
+{
+	struct buffer *parent;
+
+	current_file = current_file->parent;
+	if (current_file)
+		yylineno = current_file->lineno;
+
+	parent = current_buf->parent;
+	if (parent) {
+		fclose(yyin);
+		yy_delete_buffer(YY_CURRENT_BUFFER);
+		yy_switch_to_buffer(parent->state);
+	}
+	free(current_buf);
+	current_buf = parent;
+}
+
+int zconf_lineno(void)
+{
+	return current_pos.lineno;
+}
+
+const char *zconf_curname(void)
+{
+	return current_pos.file ? current_pos.file->name : "<none>";
+}
diff --git a/xen/tools/kconfig/list.h b/xen/tools/kconfig/list.h
index 2cf23f002d3f..45cb237ab7ef 100644
--- a/xen/tools/kconfig/list.h
+++ b/xen/tools/kconfig/list.h
@@ -1,3 +1,4 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef LIST_H
 #define LIST_H
 
diff --git a/xen/tools/kconfig/lkc.h b/xen/tools/kconfig/lkc.h
index bbc850cee12e..4fb16f316626 100644
--- a/xen/tools/kconfig/lkc.h
+++ b/xen/tools/kconfig/lkc.h
@@ -1,6 +1,6 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #ifndef LKC_H
@@ -30,10 +30,6 @@  static inline const char *CONFIG_prefix(void)
 #undef CONFIG_
 #define CONFIG_ CONFIG_prefix()
 
-#define TF_COMMAND	0x0001
-#define TF_PARAM	0x0002
-#define TF_OPTION	0x0004
-
 enum conf_def_mode {
 	def_default,
 	def_yes,
@@ -42,18 +38,7 @@  enum conf_def_mode {
 	def_random
 };
 
-#define T_OPT_MODULES		1
-#define T_OPT_DEFCONFIG_LIST	2
-#define T_OPT_ENV		3
-#define T_OPT_ALLNOCONFIG_Y	4
-
-struct kconf_id {
-	int name;
-	int token;
-	unsigned int flags;
-	enum symbol_type stype;
-};
-
+extern int yylineno;
 void zconfdump(FILE *out);
 void zconf_starthelp(void);
 FILE *zconf_fopen(const char *name);
@@ -64,8 +49,6 @@  const char *zconf_curname(void);
 
 /* confdata.c */
 const char *conf_get_configname(void);
-const char *conf_get_autoconfig_name(void);
-char *conf_get_default_confname(void);
 void sym_set_change_count(int count);
 void sym_add_change_count(int count);
 bool conf_set_all_new_symbols(enum conf_def_mode mode);
@@ -86,21 +69,27 @@  void menu_warn(struct menu *menu, const char *fmt, ...);
 struct menu *menu_add_menu(void);
 void menu_end_menu(void);
 void menu_add_entry(struct symbol *sym);
-void menu_end_entry(void);
 void menu_add_dep(struct expr *dep);
 void menu_add_visibility(struct expr *dep);
 struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep);
 void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep);
 void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep);
-void menu_add_option(int token, char *arg);
+void menu_add_option_modules(void);
+void menu_add_option_defconfig_list(void);
+void menu_add_option_allnoconfig_y(void);
 void menu_finalize(struct menu *parent);
 void menu_set_type(int type);
 
 /* util.c */
 struct file *file_lookup(const char *name);
-int file_write_dep(const char *name);
 void *xmalloc(size_t size);
 void *xcalloc(size_t nmemb, size_t size);
+void *xrealloc(void *p, size_t size);
+char *xstrdup(const char *s);
+char *xstrndup(const char *s, size_t n);
+
+/* lexer.l */
+int yylex(void);
 
 struct gstr {
 	size_t len;
@@ -118,16 +107,13 @@  void str_printf(struct gstr *gs, const char *fmt, ...);
 const char *str_get(struct gstr *gs);
 
 /* symbol.c */
-extern struct expr *sym_env_list;
-
-void sym_init(void);
 void sym_clear_all_valid(void);
 struct symbol *sym_choice_default(struct symbol *sym);
+struct property *sym_get_range_prop(struct symbol *sym);
 const char *sym_get_string_default(struct symbol *sym);
 struct symbol *sym_check_deps(struct symbol *sym);
 struct property *prop_alloc(enum prop_type type, struct symbol *sym);
 struct symbol *prop_get_symbol(struct property *prop);
-struct property *sym_get_env_prop(struct symbol *sym);
 
 static inline tristate sym_get_tristate_value(struct symbol *sym)
 {
diff --git a/xen/tools/kconfig/lkc_proto.h b/xen/tools/kconfig/lkc_proto.h
index d5398718ec2a..f9ab98238aef 100644
--- a/xen/tools/kconfig/lkc_proto.h
+++ b/xen/tools/kconfig/lkc_proto.h
@@ -1,3 +1,4 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
 #include <stdarg.h>
 
 /* confdata.c */
@@ -6,10 +7,10 @@  int conf_read(const char *name);
 int conf_read_simple(const char *name, int);
 int conf_write_defconfig(const char *name);
 int conf_write(const char *name);
-int conf_write_autoconf(void);
+int conf_write_autoconf(int overwrite);
 bool conf_get_changed(void);
 void conf_set_changed_callback(void (*fn)(void));
-void conf_set_message_callback(void (*fn)(const char *fmt, va_list ap));
+void conf_set_message_callback(void (*fn)(const char *s));
 
 /* menu.c */
 extern struct menu rootmenu;
@@ -30,7 +31,6 @@  extern struct symbol * symbol_hash[SYMBOL_HASHSIZE];
 
 struct symbol * sym_lookup(const char *name, int flags);
 struct symbol * sym_find(const char *name);
-const char * sym_expand_string_value(const char *in);
 const char * sym_escape_string_value(const char *in);
 struct symbol ** sym_re_search(const char *pattern);
 const char * sym_type_name(enum symbol_type type);
@@ -42,11 +42,24 @@  tristate sym_toggle_tristate_value(struct symbol *sym);
 bool sym_string_valid(struct symbol *sym, const char *newval);
 bool sym_string_within_range(struct symbol *sym, const char *str);
 bool sym_set_string_value(struct symbol *sym, const char *newval);
-bool sym_is_changable(struct symbol *sym);
+bool sym_is_changeable(struct symbol *sym);
 struct property * sym_get_choice_prop(struct symbol *sym);
 const char * sym_get_string_value(struct symbol *sym);
 
 const char * prop_get_type_name(enum prop_type type);
 
+/* preprocess.c */
+enum variable_flavor {
+	VAR_SIMPLE,
+	VAR_RECURSIVE,
+	VAR_APPEND,
+};
+void env_write_dep(FILE *f, const char *auto_conf_name);
+void variable_add(const char *name, const char *value,
+		  enum variable_flavor flavor);
+void variable_all_del(void);
+char *expand_dollar(const char **str);
+char *expand_one_token(const char **str);
+
 /* expr.c */
 void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken);
diff --git a/xen/tools/kconfig/lxdialog/.gitignore b/xen/tools/kconfig/lxdialog/.gitignore
deleted file mode 100644
index 90b08ff025a6..000000000000
--- a/xen/tools/kconfig/lxdialog/.gitignore
+++ /dev/null
@@ -1,4 +0,0 @@ 
-#
-# Generated files
-#
-lxdialog
diff --git a/xen/tools/kconfig/lxdialog/BIG.FAT.WARNING b/xen/tools/kconfig/lxdialog/BIG.FAT.WARNING
index a8999d82bdb3..7cb5a7ec93d2 100644
--- a/xen/tools/kconfig/lxdialog/BIG.FAT.WARNING
+++ b/xen/tools/kconfig/lxdialog/BIG.FAT.WARNING
@@ -1,4 +1,4 @@ 
 This is NOT the official version of dialog.  This version has been
 significantly modified from the original.  It is for use by the Linux
-kernel configuration script.  Please do not bother Savio Lam with 
+kernel configuration script.  Please do not bother Savio Lam with
 questions about this program.
diff --git a/xen/tools/kconfig/lxdialog/check-lxdialog.sh b/xen/tools/kconfig/lxdialog/check-lxdialog.sh
deleted file mode 100755
index 5075ebf2d3b9..000000000000
--- a/xen/tools/kconfig/lxdialog/check-lxdialog.sh
+++ /dev/null
@@ -1,91 +0,0 @@ 
-#!/bin/sh
-# Check ncurses compatibility
-
-# What library to link
-ldflags()
-{
-	pkg-config --libs ncursesw 2>/dev/null && exit
-	pkg-config --libs ncurses 2>/dev/null && exit
-	for ext in so a dll.a dylib ; do
-		for lib in ncursesw ncurses curses ; do
-			$cc -print-file-name=lib${lib}.${ext} | grep -q /
-			if [ $? -eq 0 ]; then
-				echo "-l${lib}"
-				exit
-			fi
-		done
-	done
-	exit 1
-}
-
-# Where is ncurses.h?
-ccflags()
-{
-	if pkg-config --cflags ncursesw 2>/dev/null; then
-		echo '-DCURSES_LOC="<ncurses.h>" -DNCURSES_WIDECHAR=1'
-	elif pkg-config --cflags ncurses 2>/dev/null; then
-		echo '-DCURSES_LOC="<ncurses.h>"'
-	elif [ -f /usr/include/ncursesw/curses.h ]; then
-		echo '-I/usr/include/ncursesw -DCURSES_LOC="<curses.h>"'
-		echo ' -DNCURSES_WIDECHAR=1'
-	elif [ -f /usr/include/ncurses/ncurses.h ]; then
-		echo '-I/usr/include/ncurses -DCURSES_LOC="<ncurses.h>"'
-	elif [ -f /usr/include/ncurses/curses.h ]; then
-		echo '-I/usr/include/ncurses -DCURSES_LOC="<curses.h>"'
-	elif [ -f /usr/include/ncurses.h ]; then
-		echo '-DCURSES_LOC="<ncurses.h>"'
-	else
-		echo '-DCURSES_LOC="<curses.h>"'
-	fi
-}
-
-# Temp file, try to clean up after us
-tmp=.lxdialog.tmp
-trap "rm -f $tmp" 0 1 2 3 15
-
-# Check if we can link to ncurses
-check() {
-        $cc -x c - -o $tmp 2>/dev/null <<'EOF'
-#include CURSES_LOC
-main() {}
-EOF
-	if [ $? != 0 ]; then
-	    echo " *** Unable to find the ncurses libraries or the"       1>&2
-	    echo " *** required header files."                            1>&2
-	    echo " *** 'make menuconfig' requires the ncurses libraries." 1>&2
-	    echo " *** "                                                  1>&2
-	    echo " *** Install ncurses (ncurses-devel) and try again."    1>&2
-	    echo " *** "                                                  1>&2
-	    exit 1
-	fi
-}
-
-usage() {
-	printf "Usage: $0 [-check compiler options|-ccflags|-ldflags compiler options]\n"
-}
-
-if [ $# -eq 0 ]; then
-	usage
-	exit 1
-fi
-
-cc=""
-case "$1" in
-	"-check")
-		shift
-		cc="$@"
-		check
-		;;
-	"-ccflags")
-		ccflags
-		;;
-	"-ldflags")
-		shift
-		cc="$@"
-		ldflags
-		;;
-	"*")
-		usage
-		exit 1
-		;;
-esac
diff --git a/xen/tools/kconfig/lxdialog/checklist.c b/xen/tools/kconfig/lxdialog/checklist.c
index 2e96323ad11b..fd161cfff121 100644
--- a/xen/tools/kconfig/lxdialog/checklist.c
+++ b/xen/tools/kconfig/lxdialog/checklist.c
@@ -1,3 +1,4 @@ 
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  checklist.c -- implements the checklist box
  *
@@ -5,20 +6,6 @@ 
  *     Stuart Herbert - S.Herbert@sheffield.ac.uk: radiolist extension
  *     Alessandro Rubini - rubini@ipvvis.unipv.it: merged the two
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
diff --git a/xen/tools/kconfig/lxdialog/dialog.h b/xen/tools/kconfig/lxdialog/dialog.h
index cc22e5a90e7e..68b565e3c495 100644
--- a/xen/tools/kconfig/lxdialog/dialog.h
+++ b/xen/tools/kconfig/lxdialog/dialog.h
@@ -1,21 +1,8 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  *  dialog.h -- common declarations for all dialog modules
  *
  *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <sys/types.h>
@@ -29,7 +16,7 @@ 
 #ifdef __sun__
 #define CURS_MACROS
 #endif
-#include CURSES_LOC
+#include <ncurses.h>
 
 /*
  * Colors in ncurses 1.9.9e do not work properly since foreground and
diff --git a/xen/tools/kconfig/lxdialog/inputbox.c b/xen/tools/kconfig/lxdialog/inputbox.c
index fe82ff6d744e..1dcfb288ee63 100644
--- a/xen/tools/kconfig/lxdialog/inputbox.c
+++ b/xen/tools/kconfig/lxdialog/inputbox.c
@@ -1,22 +1,9 @@ 
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  inputbox.c -- implements the input box
  *
  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
@@ -126,7 +113,8 @@  int dialog_inputbox(const char *title, const char *prompt, int height, int width
 			case KEY_DOWN:
 				break;
 			case KEY_BACKSPACE:
-			case 127:
+			case 8:   /* ^H */
+			case 127: /* ^? */
 				if (pos) {
 					wattrset(dialog, dlg.inputbox.atr);
 					if (input_x == 0) {
diff --git a/xen/tools/kconfig/lxdialog/menubox.c b/xen/tools/kconfig/lxdialog/menubox.c
index d70cab36137e..58c2f8afe59b 100644
--- a/xen/tools/kconfig/lxdialog/menubox.c
+++ b/xen/tools/kconfig/lxdialog/menubox.c
@@ -1,22 +1,9 @@ 
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  menubox.c -- implements the menu box
  *
  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 /*
diff --git a/xen/tools/kconfig/lxdialog/textbox.c b/xen/tools/kconfig/lxdialog/textbox.c
index 88d2818ed956..4e339b12664e 100644
--- a/xen/tools/kconfig/lxdialog/textbox.c
+++ b/xen/tools/kconfig/lxdialog/textbox.c
@@ -1,22 +1,9 @@ 
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  textbox.c -- implements the text box
  *
  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
diff --git a/xen/tools/kconfig/lxdialog/util.c b/xen/tools/kconfig/lxdialog/util.c
index f7abdeb92af0..1b490d4af0d3 100644
--- a/xen/tools/kconfig/lxdialog/util.c
+++ b/xen/tools/kconfig/lxdialog/util.c
@@ -1,22 +1,9 @@ 
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  util.c
  *
  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <stdarg.h>
diff --git a/xen/tools/kconfig/lxdialog/yesno.c b/xen/tools/kconfig/lxdialog/yesno.c
index cd1223c903d1..bcaac9b7bab2 100644
--- a/xen/tools/kconfig/lxdialog/yesno.c
+++ b/xen/tools/kconfig/lxdialog/yesno.c
@@ -1,22 +1,9 @@ 
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  yesno.c -- implements the yes/no box
  *
  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
diff --git a/xen/tools/kconfig/mconf-cfg.sh b/xen/tools/kconfig/mconf-cfg.sh
new file mode 100755
index 000000000000..c812872d7f9d
--- /dev/null
+++ b/xen/tools/kconfig/mconf-cfg.sh
@@ -0,0 +1,47 @@ 
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+PKG="ncursesw"
+PKG2="ncurses"
+
+if [ -n "$(command -v pkg-config)" ]; then
+	if pkg-config --exists $PKG; then
+		echo cflags=\"$(pkg-config --cflags $PKG)\"
+		echo libs=\"$(pkg-config --libs $PKG)\"
+		exit 0
+	fi
+
+	if pkg-config --exists $PKG2; then
+		echo cflags=\"$(pkg-config --cflags $PKG2)\"
+		echo libs=\"$(pkg-config --libs $PKG2)\"
+		exit 0
+	fi
+fi
+
+# Check the default paths in case pkg-config is not installed.
+# (Even if it is installed, some distributions such as openSUSE cannot
+# find ncurses by pkg-config.)
+if [ -f /usr/include/ncursesw/ncurses.h ]; then
+	echo cflags=\"-D_GNU_SOURCE -I/usr/include/ncursesw\"
+	echo libs=\"-lncursesw\"
+	exit 0
+fi
+
+if [ -f /usr/include/ncurses/ncurses.h ]; then
+	echo cflags=\"-D_GNU_SOURCE -I/usr/include/ncurses\"
+	echo libs=\"-lncurses\"
+	exit 0
+fi
+
+if [ -f /usr/include/ncurses.h ]; then
+	echo cflags=\"-D_GNU_SOURCE\"
+	echo libs=\"-lncurses\"
+	exit 0
+fi
+
+echo >&2 "*"
+echo >&2 "* Unable to find the ncurses package."
+echo >&2 "* Install ncurses (ncurses-devel or libncurses-dev"
+echo >&2 "* depending on your distribution)."
+echo >&2 "*"
+exit 1
diff --git a/xen/tools/kconfig/mconf.c b/xen/tools/kconfig/mconf.c
index 2489af60b929..49c26ea9dd98 100644
--- a/xen/tools/kconfig/mconf.c
+++ b/xen/tools/kconfig/mconf.c
@@ -1,6 +1,6 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  *
  * Introduced single menu mode (show all sub-menus in one large tree).
  * 2002-11-06 Petr Baudis <pasky@ucw.cz>
@@ -245,7 +245,7 @@  search_help[] =
 	"  Selected by: BAR [=n]\n"
 	"-----------------------------------------------------------------\n"
 	"o The line 'Type:' shows the type of the configuration option for\n"
-	"  this symbol (boolean, tristate, string, ...)\n"
+	"  this symbol (bool, tristate, string, ...)\n"
 	"o The line 'Prompt:' shows the text used in the menu structure for\n"
 	"  this symbol\n"
 	"o The 'Defined at' line tells at what file / line number the symbol\n"
@@ -490,7 +490,6 @@  static void build_conf(struct menu *menu)
 			switch (prop->type) {
 			case P_MENU:
 				child_count++;
-				prompt = prompt;
 				if (single_menu_mode) {
 					item_make("%s%*c%s",
 						  menu->data ? "-->" : "++>",
@@ -537,7 +536,7 @@  static void build_conf(struct menu *menu)
 		}
 
 		val = sym_get_tristate_value(sym);
-		if (sym_is_changable(sym)) {
+		if (sym_is_changeable(sym)) {
 			switch (type) {
 			case S_BOOLEAN:
 				item_make("[%c]", val == no ? ' ' : '*');
@@ -588,7 +587,7 @@  static void build_conf(struct menu *menu)
 		} else {
 			switch (type) {
 			case S_BOOLEAN:
-				if (sym_is_changable(sym))
+				if (sym_is_changeable(sym))
 					item_make("[%c]", val == no ? ' ' : '*');
 				else
 					item_make("-%c-", val == no ? ' ' : '*');
@@ -601,7 +600,7 @@  static void build_conf(struct menu *menu)
 				case mod: ch = 'M'; break;
 				default:  ch = ' '; break;
 				}
-				if (sym_is_changable(sym)) {
+				if (sym_is_changeable(sym)) {
 					if (sym->rev_dep.tri == mod)
 						item_make("{%c}", ch);
 					else
@@ -618,7 +617,7 @@  static void build_conf(struct menu *menu)
 				if (tmp < 0)
 					tmp = 0;
 				item_add_str("%*c%s%s", tmp, ' ', menu_get_prompt(menu),
-					     (sym_has_value(sym) || !sym_is_changable(sym)) ?
+					     (sym_has_value(sym) || !sym_is_changeable(sym)) ?
 					     "" : " (NEW)");
 				item_set_tag('s');
 				item_set_data(menu);
@@ -626,7 +625,7 @@  static void build_conf(struct menu *menu)
 			}
 		}
 		item_add_str("%*c%s%s", indent + 1, ' ', menu_get_prompt(menu),
-			  (sym_has_value(sym) || !sym_is_changable(sym)) ?
+			  (sym_has_value(sym) || !sym_is_changeable(sym)) ?
 			  "" : " (NEW)");
 		if (menu->prompt->type == P_MENU) {
 			item_add_str("  %s", menu_is_empty(menu) ? "----" : "--->");
@@ -772,16 +771,13 @@  static void show_helptext(const char *title, const char *text)
 	show_textbox(title, text, 0, 0);
 }
 
-static void conf_message_callback(const char *fmt, va_list ap)
+static void conf_message_callback(const char *s)
 {
-	char buf[PATH_MAX+1];
-
-	vsnprintf(buf, sizeof(buf), fmt, ap);
 	if (save_and_exit) {
 		if (!silent)
-			printf("%s", buf);
+			printf("%s", s);
 	} else {
-		show_textbox(NULL, buf, 6, 60);
+		show_textbox(NULL, s, 6, 60);
 	}
 }
 
@@ -940,7 +936,7 @@  static void conf_save(void)
 				set_config_filename(dialog_input_result);
 				return;
 			}
-			show_textbox(NULL, "Can't create file!  Probably a nonexistent directory.", 5, 60);
+			show_textbox(NULL, "Can't create file!", 5, 60);
 			break;
 		case 1:
 			show_helptext("Save Alternate Configuration", save_config_help);
@@ -977,6 +973,7 @@  static int handle_exit(void)
 					  "\n\n");
 			return 1;
 		}
+		conf_write_autoconf(0);
 		/* fall through */
 	case -1:
 		if (!silent)
diff --git a/xen/tools/kconfig/menu.c b/xen/tools/kconfig/menu.c
index 71d31f2bf619..d9d16469859a 100644
--- a/xen/tools/kconfig/menu.c
+++ b/xen/tools/kconfig/menu.c
@@ -1,6 +1,6 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <ctype.h>
@@ -62,13 +62,8 @@  void menu_add_entry(struct symbol *sym)
 		menu_add_symbol(P_SYMBOL, sym, NULL);
 }
 
-void menu_end_entry(void)
-{
-}
-
 struct menu *menu_add_menu(void)
 {
-	menu_end_entry();
 	last_entry_ptr = &current_entry->list;
 	return current_menu = current_entry;
 }
@@ -79,19 +74,23 @@  void menu_end_menu(void)
 	current_menu = current_menu->parent;
 }
 
-static struct expr *menu_check_dep(struct expr *e)
+/*
+ * Rewrites 'm' to 'm' && MODULES, so that it evaluates to 'n' when running
+ * without modules
+ */
+static struct expr *rewrite_m(struct expr *e)
 {
 	if (!e)
 		return e;
 
 	switch (e->type) {
 	case E_NOT:
-		e->left.expr = menu_check_dep(e->left.expr);
+		e->left.expr = rewrite_m(e->left.expr);
 		break;
 	case E_OR:
 	case E_AND:
-		e->left.expr = menu_check_dep(e->left.expr);
-		e->right.expr = menu_check_dep(e->right.expr);
+		e->left.expr = rewrite_m(e->left.expr);
+		e->right.expr = rewrite_m(e->right.expr);
 		break;
 	case E_SYMBOL:
 		/* change 'm' into 'm' && MODULES */
@@ -106,7 +105,7 @@  static struct expr *menu_check_dep(struct expr *e)
 
 void menu_add_dep(struct expr *dep)
 {
-	current_entry->dep = expr_alloc_and(current_entry->dep, menu_check_dep(dep));
+	current_entry->dep = expr_alloc_and(current_entry->dep, dep);
 }
 
 void menu_set_type(int type)
@@ -131,7 +130,7 @@  static struct property *menu_add_prop(enum prop_type type, char *prompt, struct
 
 	prop->menu = current_entry;
 	prop->expr = expr;
-	prop->visible.expr = menu_check_dep(dep);
+	prop->visible.expr = dep;
 
 	if (prompt) {
 		if (isspace(*prompt)) {
@@ -196,31 +195,26 @@  void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep)
 	menu_add_prop(type, NULL, expr_alloc_symbol(sym), dep);
 }
 
-void menu_add_option(int token, char *arg)
+void menu_add_option_modules(void)
 {
-	switch (token) {
-	case T_OPT_MODULES:
-		if (modules_sym)
-			zconf_error("symbol '%s' redefines option 'modules'"
-				    " already defined by symbol '%s'",
-				    current_entry->sym->name,
-				    modules_sym->name
-				    );
-		modules_sym = current_entry->sym;
-		break;
-	case T_OPT_DEFCONFIG_LIST:
-		if (!sym_defconfig_list)
-			sym_defconfig_list = current_entry->sym;
-		else if (sym_defconfig_list != current_entry->sym)
-			zconf_error("trying to redefine defconfig symbol");
-		break;
-	case T_OPT_ENV:
-		prop_add_env(arg);
-		break;
-	case T_OPT_ALLNOCONFIG_Y:
-		current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
-		break;
-	}
+	if (modules_sym)
+		zconf_error("symbol '%s' redefines option 'modules' already defined by symbol '%s'",
+			    current_entry->sym->name, modules_sym->name);
+	modules_sym = current_entry->sym;
+}
+
+void menu_add_option_defconfig_list(void)
+{
+	if (!sym_defconfig_list)
+		sym_defconfig_list = current_entry->sym;
+	else if (sym_defconfig_list != current_entry->sym)
+		zconf_error("trying to redefine defconfig symbol");
+	sym_defconfig_list->flags |= SYMBOL_NO_WRITE;
+}
+
+void menu_add_option_allnoconfig_y(void)
+{
+	current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
 }
 
 static int menu_validate_number(struct symbol *sym, struct symbol *sym2)
@@ -233,6 +227,8 @@  static void sym_check_prop(struct symbol *sym)
 {
 	struct property *prop;
 	struct symbol *sym2;
+	char *use;
+
 	for (prop = sym->prop; prop; prop = prop->next) {
 		switch (prop->type) {
 		case P_DEFAULT:
@@ -250,20 +246,32 @@  static void sym_check_prop(struct symbol *sym)
 					    "'%s': number is invalid",
 					    sym->name);
 			}
+			if (sym_is_choice(sym)) {
+				struct property *choice_prop =
+					sym_get_choice_prop(sym2);
+
+				if (!choice_prop ||
+				    prop_get_symbol(choice_prop) != sym)
+					prop_warn(prop,
+						  "choice default symbol '%s' is not contained in the choice",
+						  sym2->name);
+			}
 			break;
 		case P_SELECT:
+		case P_IMPLY:
+			use = prop->type == P_SELECT ? "select" : "imply";
 			sym2 = prop_get_symbol(prop);
 			if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE)
 				prop_warn(prop,
-				    "config symbol '%s' uses select, but is "
-				    "not boolean or tristate", sym->name);
+				    "config symbol '%s' uses %s, but is "
+				    "not bool or tristate", sym->name, use);
 			else if (sym2->type != S_UNKNOWN &&
 				 sym2->type != S_BOOLEAN &&
 				 sym2->type != S_TRISTATE)
 				prop_warn(prop,
-				    "'%s' has wrong type. 'select' only "
-				    "accept arguments of boolean and "
-				    "tristate type", sym2->name);
+				    "'%s' has wrong type. '%s' only "
+				    "accept arguments of bool and "
+				    "tristate type", sym2->name, use);
 			break;
 		case P_RANGE:
 			if (sym->type != S_INT && sym->type != S_HEX)
@@ -288,6 +296,11 @@  void menu_finalize(struct menu *parent)
 
 	sym = parent->sym;
 	if (parent->list) {
+		/*
+		 * This menu node has children. We (recursively) process them
+		 * and propagate parent dependencies before moving on.
+		 */
+
 		if (sym && sym_is_choice(sym)) {
 			if (sym->type == S_UNKNOWN) {
 				/* find the first choice value to find out choice type */
@@ -305,65 +318,169 @@  void menu_finalize(struct menu *parent)
 				if (menu->sym && menu->sym->type == S_UNKNOWN)
 					menu_set_type(sym->type);
 			}
+
+			/*
+			 * Use the choice itself as the parent dependency of
+			 * the contained items. This turns the mode of the
+			 * choice into an upper bound on the visibility of the
+			 * choice value symbols.
+			 */
 			parentdep = expr_alloc_symbol(sym);
 		} else if (parent->prompt)
+			/* Menu node for 'menu' */
 			parentdep = parent->prompt->visible.expr;
 		else
+			/* Menu node for 'if' */
 			parentdep = parent->dep;
 
+		/* For each child menu node... */
 		for (menu = parent->list; menu; menu = menu->next) {
-			basedep = expr_transform(menu->dep);
+			/*
+			 * Propagate parent dependencies to the child menu
+			 * node, also rewriting and simplifying expressions
+			 */
+			basedep = rewrite_m(menu->dep);
+			basedep = expr_transform(basedep);
 			basedep = expr_alloc_and(expr_copy(parentdep), basedep);
 			basedep = expr_eliminate_dups(basedep);
 			menu->dep = basedep;
+
 			if (menu->sym)
+				/*
+				 * Note: For symbols, all prompts are included
+				 * too in the symbol's own property list
+				 */
 				prop = menu->sym->prop;
 			else
+				/*
+				 * For non-symbol menu nodes, we just need to
+				 * handle the prompt
+				 */
 				prop = menu->prompt;
+
+			/* For each property... */
 			for (; prop; prop = prop->next) {
 				if (prop->menu != menu)
+					/*
+					 * Two possibilities:
+					 *
+					 * 1. The property lacks dependencies
+					 *    and so isn't location-specific,
+					 *    e.g. an 'option'
+					 *
+					 * 2. The property belongs to a symbol
+					 *    defined in multiple locations and
+					 *    is from some other location. It
+					 *    will be handled there in that
+					 *    case.
+					 *
+					 * Skip the property.
+					 */
 					continue;
-				dep = expr_transform(prop->visible.expr);
+
+				/*
+				 * Propagate parent dependencies to the
+				 * property's condition, rewriting and
+				 * simplifying expressions at the same time
+				 */
+				dep = rewrite_m(prop->visible.expr);
+				dep = expr_transform(dep);
 				dep = expr_alloc_and(expr_copy(basedep), dep);
 				dep = expr_eliminate_dups(dep);
 				if (menu->sym && menu->sym->type != S_TRISTATE)
 					dep = expr_trans_bool(dep);
 				prop->visible.expr = dep;
+
+				/*
+				 * Handle selects and implies, which modify the
+				 * dependencies of the selected/implied symbol
+				 */
 				if (prop->type == P_SELECT) {
 					struct symbol *es = prop_get_symbol(prop);
 					es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
 							expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
+				} else if (prop->type == P_IMPLY) {
+					struct symbol *es = prop_get_symbol(prop);
+					es->implied.expr = expr_alloc_or(es->implied.expr,
+							expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
 				}
 			}
 		}
+
+		if (sym && sym_is_choice(sym))
+			expr_free(parentdep);
+
+		/*
+		 * Recursively process children in the same fashion before
+		 * moving on
+		 */
 		for (menu = parent->list; menu; menu = menu->next)
 			menu_finalize(menu);
 	} else if (sym) {
+		/*
+		 * Automatic submenu creation. If sym is a symbol and A, B, C,
+		 * ... are consecutive items (symbols, menus, ifs, etc.) that
+		 * all depend on sym, then the following menu structure is
+		 * created:
+		 *
+		 *	sym
+		 *	 +-A
+		 *	 +-B
+		 *	 +-C
+		 *	 ...
+		 *
+		 * This also works recursively, giving the following structure
+		 * if A is a symbol and B depends on A:
+		 *
+		 *	sym
+		 *	 +-A
+		 *	 | +-B
+		 *	 +-C
+		 *	 ...
+		 */
+
 		basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
 		basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
 		basedep = expr_eliminate_dups(expr_transform(basedep));
+
+		/* Examine consecutive elements after sym */
 		last_menu = NULL;
 		for (menu = parent->next; menu; menu = menu->next) {
 			dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
 			if (!expr_contains_symbol(dep, sym))
+				/* No dependency, quit */
 				break;
 			if (expr_depends_symbol(dep, sym))
+				/* Absolute dependency, put in submenu */
 				goto next;
+
+			/*
+			 * Also consider it a dependency on sym if our
+			 * dependencies contain sym and are a "superset" of
+			 * sym's dependencies, e.g. '(sym || Q) && R' when sym
+			 * depends on R.
+			 *
+			 * Note that 'R' might be from an enclosing menu or if,
+			 * making this a more common case than it might seem.
+			 */
 			dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
 			dep = expr_eliminate_dups(expr_transform(dep));
 			dep2 = expr_copy(basedep);
 			expr_eliminate_eq(&dep, &dep2);
 			expr_free(dep);
 			if (!expr_is_yes(dep2)) {
+				/* Not superset, quit */
 				expr_free(dep2);
 				break;
 			}
+			/* Superset, put in submenu */
 			expr_free(dep2);
 		next:
 			menu_finalize(menu);
 			menu->parent = parent;
 			last_menu = menu;
 		}
+		expr_free(basedep);
 		if (last_menu) {
 			parent->list = parent->next;
 			parent->next = last_menu->next;
@@ -412,6 +529,35 @@  void menu_finalize(struct menu *parent)
 			*ep = expr_alloc_one(E_LIST, NULL);
 			(*ep)->right.sym = menu->sym;
 		}
+
+		/*
+		 * This code serves two purposes:
+		 *
+		 * (1) Flattening 'if' blocks, which do not specify a submenu
+		 *     and only add dependencies.
+		 *
+		 *     (Automatic submenu creation might still create a submenu
+		 *     from an 'if' before this code runs.)
+		 *
+		 * (2) "Undoing" any automatic submenus created earlier below
+		 *     promptless symbols.
+		 *
+		 * Before:
+		 *
+		 *	A
+		 *	if ... (or promptless symbol)
+		 *	 +-B
+		 *	 +-C
+		 *	D
+		 *
+		 * After:
+		 *
+		 *	A
+		 *	if ... (or promptless symbol)
+		 *	B
+		 *	C
+		 *	D
+		 */
 		if (menu->list && (!menu->prompt || !menu->prompt->text)) {
 			for (last_menu = menu->list; ; last_menu = last_menu->next) {
 				last_menu->parent = parent;
@@ -436,6 +582,15 @@  void menu_finalize(struct menu *parent)
 		sym->flags |= SYMBOL_WARNED;
 	}
 
+	/*
+	 * For non-optional choices, add a reverse dependency (corresponding to
+	 * a select) of '<visibility> && m'. This prevents the user from
+	 * setting the choice mode to 'n' when the choice is visible.
+	 *
+	 * This would also work for non-choice symbols, but only non-optional
+	 * choices clear SYMBOL_OPTIONAL as of writing. Choices are implemented
+	 * as a type of symbol.
+	 */
 	if (sym && !sym_is_optional(sym) && parent->prompt) {
 		sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
 				expr_alloc_and(parent->prompt->visible.expr,
@@ -477,7 +632,7 @@  bool menu_is_visible(struct menu *menu)
 
 	if (menu->visibility) {
 		if (expr_calc_value(menu->visibility) == no)
-			return no;
+			return false;
 	}
 
 	sym = menu->sym;
@@ -612,13 +767,30 @@  static struct property *get_symbol_prop(struct symbol *sym)
 	return prop;
 }
 
+static void get_symbol_props_str(struct gstr *r, struct symbol *sym,
+				 enum prop_type tok, const char *prefix)
+{
+	bool hit = false;
+	struct property *prop;
+
+	for_all_properties(sym, prop, tok) {
+		if (!hit) {
+			str_append(r, prefix);
+			hit = true;
+		} else
+			str_printf(r, " && ");
+		expr_gstr_print(prop->expr, r);
+	}
+	if (hit)
+		str_append(r, "\n");
+}
+
 /*
  * head is optional and may be NULL
  */
 static void get_symbol_str(struct gstr *r, struct symbol *sym,
 		    struct list_head *head)
 {
-	bool hit;
 	struct property *prop;
 
 	if (sym && sym->name) {
@@ -648,22 +820,20 @@  static void get_symbol_str(struct gstr *r, struct symbol *sym,
 		}
 	}
 
-	hit = false;
-	for_all_properties(sym, prop, P_SELECT) {
-		if (!hit) {
-			str_append(r, "  Selects: ");
-			hit = true;
-		} else
-			str_printf(r, " && ");
-		expr_gstr_print(prop->expr, r);
-	}
-	if (hit)
-		str_append(r, "\n");
+	get_symbol_props_str(r, sym, P_SELECT, "  Selects: ");
 	if (sym->rev_dep.expr) {
-		str_append(r, "  Selected by: ");
-		expr_gstr_print(sym->rev_dep.expr, r);
-		str_append(r, "\n");
+		expr_gstr_print_revdep(sym->rev_dep.expr, r, yes, "  Selected by [y]:\n");
+		expr_gstr_print_revdep(sym->rev_dep.expr, r, mod, "  Selected by [m]:\n");
+		expr_gstr_print_revdep(sym->rev_dep.expr, r, no, "  Selected by [n]:\n");
+	}
+
+	get_symbol_props_str(r, sym, P_IMPLY, "  Implies: ");
+	if (sym->implied.expr) {
+		expr_gstr_print_revdep(sym->implied.expr, r, yes, "  Implied by [y]:\n");
+		expr_gstr_print_revdep(sym->implied.expr, r, mod, "  Implied by [m]:\n");
+		expr_gstr_print_revdep(sym->implied.expr, r, no, "  Implied by [n]:\n");
 	}
+
 	str_append(r, "\n\n");
 }
 
diff --git a/xen/tools/kconfig/merge_config.sh b/xen/tools/kconfig/merge_config.sh
index 0d883b37882a..63c8565206a4 100755
--- a/xen/tools/kconfig/merge_config.sh
+++ b/xen/tools/kconfig/merge_config.sh
@@ -1,4 +1,6 @@ 
 #!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
 #  merge_config.sh - Takes a list of config fragment values, and merges
 #  them one by one. Provides warnings on overridden values, and specified
 #  values that did not make it to the resulting .config file (due to missed
@@ -10,21 +12,13 @@ 
 #
 #  Copyright (c) 2009-2010 Wind River Systems, Inc.
 #  Copyright 2011 Linaro
-#
-#  This program is free software; you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License version 2 as
-#  published by the Free Software Foundation.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-#  See the GNU General Public License for more details.
+
+set -e
 
 clean_up() {
 	rm -f $TMP_FILE
-	exit
+	rm -f $MERGE_FILE
 }
-trap clean_up HUP INT TERM
 
 usage() {
 	echo "Usage: $0 [OPTIONS] [CONFIG [...]]"
@@ -32,13 +26,18 @@  usage() {
 	echo "  -m    only merge the fragments, do not execute the make command"
 	echo "  -n    use allnoconfig instead of alldefconfig"
 	echo "  -r    list redundant entries when merging fragments"
-	echo "  -O    dir to put generated output files"
+	echo "  -y    make builtin have precedence over modules"
+	echo "  -O    dir to put generated output files.  Consider setting \$KCONFIG_CONFIG instead."
+	echo
+	echo "Used prefix: '$CONFIG_PREFIX'. You can redefine it with \$CONFIG_ environment variable."
 }
 
 RUNMAKE=true
 ALLTARGET=alldefconfig
 WARNREDUN=false
+BUILTIN=false
 OUTPUT=.
+CONFIG_PREFIX=${CONFIG_-CONFIG_}
 
 while true; do
 	case $1 in
@@ -61,6 +60,11 @@  while true; do
 		shift
 		continue
 		;;
+	"-y")
+		BUILTIN=true
+		shift
+		continue
+		;;
 	"-O")
 		if [ -d $2 ];then
 			OUTPUT=$(echo $2 | sed 's/\/*$//')
@@ -77,11 +81,19 @@  while true; do
 	esac
 done
 
-if [ "$#" -lt 2 ] ; then
+if [ "$#" -lt 1 ] ; then
 	usage
 	exit
 fi
 
+if [ -z "$KCONFIG_CONFIG" ]; then
+	if [ "$OUTPUT" != . ]; then
+		KCONFIG_CONFIG=$(readlink -m -- "$OUTPUT/.config")
+	else
+		KCONFIG_CONFIG=.config
+	fi
+fi
+
 INITFILE=$1
 shift;
 
@@ -91,44 +103,61 @@  if [ ! -r "$INITFILE" ]; then
 fi
 
 MERGE_LIST=$*
-SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
+SED_CONFIG_EXP1="s/^\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)=.*/\1/p"
+SED_CONFIG_EXP2="s/^# \(${CONFIG_PREFIX}[a-zA-Z0-9_]*\) is not set$/\1/p"
+
 TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
+MERGE_FILE=$(mktemp ./.merge_tmp.config.XXXXXXXXXX)
 
 echo "Using $INITFILE as base"
+
+trap clean_up EXIT
+
 cat $INITFILE > $TMP_FILE
 
 # Merge files, printing warnings on overridden values
-for MERGE_FILE in $MERGE_LIST ; do
-	echo "Merging $MERGE_FILE"
-	if [ ! -r "$MERGE_FILE" ]; then
-		echo "The merge file '$MERGE_FILE' does not exist.  Exit." >&2
+for ORIG_MERGE_FILE in $MERGE_LIST ; do
+	echo "Merging $ORIG_MERGE_FILE"
+	if [ ! -r "$ORIG_MERGE_FILE" ]; then
+		echo "The merge file '$ORIG_MERGE_FILE' does not exist.  Exit." >&2
 		exit 1
 	fi
-	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
+	cat $ORIG_MERGE_FILE > $MERGE_FILE
+	CFG_LIST=$(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $MERGE_FILE)
 
 	for CFG in $CFG_LIST ; do
 		grep -q -w $CFG $TMP_FILE || continue
 		PREV_VAL=$(grep -w $CFG $TMP_FILE)
 		NEW_VAL=$(grep -w $CFG $MERGE_FILE)
-		if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
-			echo Value of $CFG is redefined by fragment $MERGE_FILE:
+		BUILTIN_FLAG=false
+		if [ "$BUILTIN" = "true" ] && [ "${NEW_VAL#CONFIG_*=}" = "m" ] && [ "${PREV_VAL#CONFIG_*=}" = "y" ]; then
+			echo Previous  value: $PREV_VAL
+			echo New value:       $NEW_VAL
+			echo -y passed, will not demote y to m
+			echo
+			BUILTIN_FLAG=true
+		elif [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
+			echo Value of $CFG is redefined by fragment $ORIG_MERGE_FILE:
 			echo Previous  value: $PREV_VAL
 			echo New value:       $NEW_VAL
 			echo
 		elif [ "$WARNREDUN" = "true" ]; then
-			echo Value of $CFG is redundant by fragment $MERGE_FILE:
+			echo Value of $CFG is redundant by fragment $ORIG_MERGE_FILE:
+		fi
+		if [ "$BUILTIN_FLAG" = "false" ]; then
+			sed -i "/$CFG[ =]/d" $TMP_FILE
+		else
+			sed -i "/$CFG[ =]/d" $MERGE_FILE
 		fi
-		sed -i "/$CFG[ =]/d" $TMP_FILE
 	done
 	cat $MERGE_FILE >> $TMP_FILE
 done
 
 if [ "$RUNMAKE" = "false" ]; then
-	cp $TMP_FILE $OUTPUT/.config
+	cp -T -- "$TMP_FILE" "$KCONFIG_CONFIG"
 	echo "#"
-	echo "# merged configuration written to $OUTPUT/.config (needs make)"
+	echo "# merged configuration written to $KCONFIG_CONFIG (needs make)"
 	echo "#"
-	clean_up
 	exit
 fi
 
@@ -147,10 +176,10 @@  make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
 
 
 # Check all specified config values took (might have missed-dependency issues)
-for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
+for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
 
 	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
-	ACTUAL_VAL=$(grep -w -e "$CFG" $OUTPUT/.config)
+	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG" || true)
 	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
 		echo "Value requested for $CFG not in final .config"
 		echo "Requested value:  $REQUESTED_VAL"
@@ -158,5 +187,3 @@  for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
 		echo ""
 	fi
 done
-
-clean_up
diff --git a/xen/tools/kconfig/nconf-cfg.sh b/xen/tools/kconfig/nconf-cfg.sh
new file mode 100755
index 000000000000..001559ef0a60
--- /dev/null
+++ b/xen/tools/kconfig/nconf-cfg.sh
@@ -0,0 +1,47 @@ 
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+PKG="ncursesw menuw panelw"
+PKG2="ncurses menu panel"
+
+if [ -n "$(command -v pkg-config)" ]; then
+	if pkg-config --exists $PKG; then
+		echo cflags=\"$(pkg-config --cflags $PKG)\"
+		echo libs=\"$(pkg-config --libs $PKG)\"
+		exit 0
+	fi
+
+	if pkg-config --exists $PKG2; then
+		echo cflags=\"$(pkg-config --cflags $PKG2)\"
+		echo libs=\"$(pkg-config --libs $PKG2)\"
+		exit 0
+	fi
+fi
+
+# Check the default paths in case pkg-config is not installed.
+# (Even if it is installed, some distributions such as openSUSE cannot
+# find ncurses by pkg-config.)
+if [ -f /usr/include/ncursesw/ncurses.h ]; then
+	echo cflags=\"-D_GNU_SOURCE -I/usr/include/ncursesw\"
+	echo libs=\"-lncursesw -lmenuw -lpanelw\"
+	exit 0
+fi
+
+if [ -f /usr/include/ncurses/ncurses.h ]; then
+	echo cflags=\"-D_GNU_SOURCE -I/usr/include/ncurses\"
+	echo libs=\"-lncurses -lmenu -lpanel\"
+	exit 0
+fi
+
+if [ -f /usr/include/ncurses.h ]; then
+	echo cflags=\"-D_GNU_SOURCE\"
+	echo libs=\"-lncurses -lmenu -lpanel\"
+	exit 0
+fi
+
+echo >&2 "*"
+echo >&2 "* Unable to find the ncurses package."
+echo >&2 "* Install ncurses (ncurses-devel or libncurses-dev"
+echo >&2 "* depending on your distribution)."
+echo >&2 "*"
+exit 1
diff --git a/xen/tools/kconfig/nconf.c b/xen/tools/kconfig/nconf.c
index b6e44cbe5929..b7c1ef757178 100644
--- a/xen/tools/kconfig/nconf.c
+++ b/xen/tools/kconfig/nconf.c
@@ -1,11 +1,12 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com?
- * Released under the terms of the GNU GPL v2.0.
+ * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com>
  *
  * Derived from menuconfig.
- *
  */
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <string.h>
 #include <stdlib.h>
 
@@ -269,7 +270,7 @@  static struct mitem k_menu_items[MAX_MENU_ITEMS];
 static int items_num;
 static int global_exit;
 /* the currently selected button */
-const char *current_instructions = menu_instructions;
+static const char *current_instructions = menu_instructions;
 
 static char *dialog_input_result;
 static int dialog_input_result_len;
@@ -303,7 +304,7 @@  struct function_keys {
 };
 
 static const int function_keys_num = 9;
-struct function_keys function_keys[] = {
+static struct function_keys function_keys[] = {
 	{
 		.key_str = "F1",
 		.func = "Help",
@@ -506,7 +507,7 @@  static int get_mext_match(const char *match_str, match_f flag)
 	index = (index + items_num) % items_num;
 	while (true) {
 		char *str = k_menu_items[index].str;
-		if (strcasestr(str, match_str) != 0)
+		if (strcasestr(str, match_str) != NULL)
 			return index;
 		if (flag == FIND_NEXT_MATCH_UP ||
 		    flag == MATCH_TINKER_PATTERN_UP)
@@ -672,6 +673,7 @@  static int do_exit(void)
 				  "Your configuration changes were NOT saved.",
 				  1,
 				  "<OK>");
+		conf_write_autoconf(0);
 		break;
 	default:
 		btn_dialog(
@@ -801,7 +803,7 @@  static void build_conf(struct menu *menu)
 		}
 
 		val = sym_get_tristate_value(sym);
-		if (sym_is_changable(sym)) {
+		if (sym_is_changeable(sym)) {
 			switch (type) {
 			case S_BOOLEAN:
 				item_make(menu, 't', "[%c]",
@@ -855,7 +857,7 @@  static void build_conf(struct menu *menu)
 		} else {
 			switch (type) {
 			case S_BOOLEAN:
-				if (sym_is_changable(sym))
+				if (sym_is_changeable(sym))
 					item_make(menu, 't', "[%c]",
 						val == no ? ' ' : '*');
 				else
@@ -874,7 +876,7 @@  static void build_conf(struct menu *menu)
 					ch = ' ';
 					break;
 				}
-				if (sym_is_changable(sym)) {
+				if (sym_is_changeable(sym)) {
 					if (sym->rev_dep.tri == mod)
 						item_make(menu,
 							't', "{%c}", ch);
@@ -894,14 +896,14 @@  static void build_conf(struct menu *menu)
 				item_add_str("%*c%s%s", tmp, ' ',
 						menu_get_prompt(menu),
 						(sym_has_value(sym) ||
-						 !sym_is_changable(sym)) ? "" :
+						 !sym_is_changeable(sym)) ? "" :
 						" (NEW)");
 				goto conf_childs;
 			}
 		}
 		item_add_str("%*c%s%s", indent + 1, ' ',
 				menu_get_prompt(menu),
-				(sym_has_value(sym) || !sym_is_changable(sym)) ?
+				(sym_has_value(sym) || !sym_is_changeable(sym)) ?
 				"" : " (NEW)");
 		if (menu->prompt && menu->prompt->type == P_MENU) {
 			item_add_str("  %s", menu_is_empty(menu) ? "----" : "--->");
@@ -1046,7 +1048,7 @@  static int do_match(int key, struct match_state *state, int *ans)
 		state->match_direction = FIND_NEXT_MATCH_UP;
 		*ans = get_mext_match(state->pattern,
 				state->match_direction);
-	} else if (key == KEY_BACKSPACE || key == 127) {
+	} else if (key == KEY_BACKSPACE || key == 8 || key == 127) {
 		state->pattern[strlen(state->pattern)-1] = '\0';
 		adj_match_dir(&state->match_direction);
 	} else
@@ -1065,7 +1067,7 @@  static int do_match(int key, struct match_state *state, int *ans)
 
 static void conf(struct menu *menu)
 {
-	struct menu *submenu = 0;
+	struct menu *submenu = NULL;
 	const char *prompt = menu_get_prompt(menu);
 	struct symbol *sym;
 	int res;
@@ -1208,12 +1210,9 @@  static void conf(struct menu *menu)
 	}
 }
 
-static void conf_message_callback(const char *fmt, va_list ap)
+static void conf_message_callback(const char *s)
 {
-	char buf[1024];
-
-	vsnprintf(buf, sizeof(buf), fmt, ap);
-	btn_dialog(main_window, buf, 1, "<OK>");
+	btn_dialog(main_window, s, 1, "<OK>");
 }
 
 static void show_help(struct menu *menu)
@@ -1232,7 +1231,7 @@  static void show_help(struct menu *menu)
 static void conf_choice(struct menu *menu)
 {
 	const char *prompt = menu_get_prompt(menu);
-	struct menu *child = 0;
+	struct menu *child = NULL;
 	struct symbol *active;
 	int selected_index = 0;
 	int last_top_row = 0;
@@ -1439,8 +1438,7 @@  static void conf_save(void)
 				set_config_filename(dialog_input_result);
 				return;
 			}
-			btn_dialog(main_window, "Can't create file! "
-				"Probably a nonexistent directory.",
+			btn_dialog(main_window, "Can't create file!",
 				1, "<OK>");
 			break;
 		case 1:
@@ -1454,7 +1452,7 @@  static void conf_save(void)
 	}
 }
 
-void setup_windows(void)
+static void setup_windows(void)
 {
 	int lines, columns;
 
diff --git a/xen/tools/kconfig/nconf.gui.c b/xen/tools/kconfig/nconf.gui.c
index 8275f0e55106..77f525a8617c 100644
--- a/xen/tools/kconfig/nconf.gui.c
+++ b/xen/tools/kconfig/nconf.gui.c
@@ -1,11 +1,11 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com?
- * Released under the terms of the GNU GPL v2.0.
+ * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com>
  *
  * Derived from menuconfig.
- *
  */
 #include "nconf.h"
+#include "lkc.h"
 
 /* a list of all the different widgets we use */
 attributes_t attributes[ATTR_MAX+1] = {0};
@@ -129,7 +129,7 @@  static void no_colors_theme(void)
 	mkattrn(FUNCTION_TEXT, A_REVERSE);
 }
 
-void set_colors()
+void set_colors(void)
 {
 	start_color();
 	use_default_colors();
@@ -192,7 +192,7 @@  const char *get_line(const char *text, int line_no)
 	int lines = 0;
 
 	if (!text)
-		return 0;
+		return NULL;
 
 	for (i = 0; text[i] != '\0' && lines < line_no; i++)
 		if (text[i] == '\n')
@@ -364,15 +364,17 @@  int dialog_inputbox(WINDOW *main_window,
 	WINDOW *prompt_win;
 	WINDOW *form_win;
 	PANEL *panel;
-	int i, x, y;
+	int i, x, y, lines, columns, win_lines, win_cols;
 	int res = -1;
 	int cursor_position = strlen(init);
 	int cursor_form_win;
 	char *result = *resultp;
 
+	getmaxyx(stdscr, lines, columns);
+
 	if (strlen(init)+1 > *result_len) {
 		*result_len = strlen(init)+1;
-		*resultp = result = realloc(result, *result_len);
+		*resultp = result = xrealloc(result, *result_len);
 	}
 
 	/* find the widest line of msg: */
@@ -386,14 +388,19 @@  int dialog_inputbox(WINDOW *main_window,
 	if (title)
 		prompt_width = max(prompt_width, strlen(title));
 
+	win_lines = min(prompt_lines+6, lines-2);
+	win_cols = min(prompt_width+7, columns-2);
+	prompt_lines = max(win_lines-6, 0);
+	prompt_width = max(win_cols-7, 0);
+
 	/* place dialog in middle of screen */
-	y = (getmaxy(stdscr)-(prompt_lines+4))/2;
-	x = (getmaxx(stdscr)-(prompt_width+4))/2;
+	y = (lines-win_lines)/2;
+	x = (columns-win_cols)/2;
 
 	strncpy(result, init, *result_len);
 
 	/* create the windows */
-	win = newwin(prompt_lines+6, prompt_width+7, y, x);
+	win = newwin(win_lines, win_cols, y, x);
 	prompt_win = derwin(win, prompt_lines+1, prompt_width, 2, 2);
 	form_win = derwin(win, 1, prompt_width, prompt_lines+3, 2);
 	keypad(form_win, TRUE);
@@ -432,7 +439,8 @@  int dialog_inputbox(WINDOW *main_window,
 		case KEY_F(F_EXIT):
 		case KEY_F(F_BACK):
 			break;
-		case 127:
+		case 8:   /* ^H */
+		case 127: /* ^? */
 		case KEY_BACKSPACE:
 			if (cursor_position > 0) {
 				memmove(&result[cursor_position-1],
diff --git a/xen/tools/kconfig/nconf.h b/xen/tools/kconfig/nconf.h
index 5e968163a41c..fa5245eb93a7 100644
--- a/xen/tools/kconfig/nconf.h
+++ b/xen/tools/kconfig/nconf.h
@@ -1,9 +1,8 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com?
- * Released under the terms of the GNU GPL v2.0.
+ * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com>
  *
  * Derived from menuconfig.
- *
  */
 
 #include <ctype.h>
@@ -14,7 +13,7 @@ 
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <curses.h>
+#include <ncurses.h>
 #include <menu.h>
 #include <panel.h>
 #include <form.h>
@@ -23,8 +22,6 @@ 
 #include <time.h>
 #include <sys/time.h>
 
-#include "ncurses.h"
-
 #define max(a, b) ({\
 		typeof(a) _a = a;\
 		typeof(b) _b = b;\
diff --git a/xen/tools/kconfig/zconf.y b/xen/tools/kconfig/parser.y
similarity index 66%
rename from xen/tools/kconfig/zconf.y
rename to xen/tools/kconfig/parser.y
index 6efcd5a36309..60936c76865b 100644
--- a/xen/tools/kconfig/zconf.y
+++ b/xen/tools/kconfig/parser.y
@@ -1,8 +1,8 @@ 
-%{
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
+%{
 
 #include <ctype.h>
 #include <stdarg.h>
@@ -20,62 +20,69 @@ 
 
 int cdebug = PRINTD;
 
-extern int zconflex(void);
+static void yyerror(const char *err);
 static void zconfprint(const char *err, ...);
 static void zconf_error(const char *err, ...);
-static void zconferror(const char *err);
-static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int endtoken);
+static bool zconf_endtoken(const char *tokenname,
+			   const char *expected_tokenname);
 
 struct symbol *symbol_hash[SYMBOL_HASHSIZE];
 
 static struct menu *current_menu, *current_entry;
 
 %}
-%expect 30
 
 %union
 {
 	char *string;
-	struct file *file;
 	struct symbol *symbol;
 	struct expr *expr;
 	struct menu *menu;
-	const struct kconf_id *id;
+	enum symbol_type type;
+	enum variable_flavor flavor;
 }
 
-%token <id>T_MAINMENU
-%token <id>T_MENU
-%token <id>T_ENDMENU
-%token <id>T_SOURCE
-%token <id>T_CHOICE
-%token <id>T_ENDCHOICE
-%token <id>T_COMMENT
-%token <id>T_CONFIG
-%token <id>T_MENUCONFIG
-%token <id>T_HELP
 %token <string> T_HELPTEXT
-%token <id>T_IF
-%token <id>T_ENDIF
-%token <id>T_DEPENDS
-%token <id>T_OPTIONAL
-%token <id>T_PROMPT
-%token <id>T_TYPE
-%token <id>T_DEFAULT
-%token <id>T_SELECT
-%token <id>T_RANGE
-%token <id>T_VISIBLE
-%token <id>T_OPTION
-%token <id>T_ON
 %token <string> T_WORD
 %token <string> T_WORD_QUOTE
-%token T_UNEQUAL
-%token T_LESS
-%token T_LESS_EQUAL
-%token T_GREATER
-%token T_GREATER_EQUAL
+%token T_ALLNOCONFIG_Y
+%token T_BOOL
+%token T_CHOICE
 %token T_CLOSE_PAREN
+%token T_COLON_EQUAL
+%token T_COMMENT
+%token T_CONFIG
+%token T_DEFAULT
+%token T_DEFCONFIG_LIST
+%token T_DEF_BOOL
+%token T_DEF_TRISTATE
+%token T_DEPENDS
+%token T_ENDCHOICE
+%token T_ENDIF
+%token T_ENDMENU
+%token T_HELP
+%token T_HEX
+%token T_IF
+%token T_IMPLY
+%token T_INT
+%token T_MAINMENU
+%token T_MENU
+%token T_MENUCONFIG
+%token T_MODULES
+%token T_ON
 %token T_OPEN_PAREN
+%token T_OPTION
+%token T_OPTIONAL
+%token T_PLUS_EQUAL
+%token T_PROMPT
+%token T_RANGE
+%token T_SELECT
+%token T_SOURCE
+%token T_STRING
+%token T_TRISTATE
+%token T_VISIBLE
 %token T_EOL
+%token <string> T_ASSIGN_VAL
 
 %left T_OR
 %left T_AND
@@ -84,13 +91,15 @@  static struct menu *current_menu, *current_entry;
 %nonassoc T_NOT
 
 %type <string> prompt
+%type <symbol> nonconst_symbol
 %type <symbol> symbol
+%type <type> type logic_type default
 %type <expr> expr
 %type <expr> if_expr
-%type <id> end
-%type <id> option_name
+%type <string> end
 %type <menu> if_entry menu_entry choice_entry
-%type <string> symbol_option_arg word_opt
+%type <string> word_opt assign_val
+%type <flavor> assign_op
 
 %destructor {
 	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
@@ -99,71 +108,53 @@  static struct menu *current_menu, *current_entry;
 		menu_end_menu();
 } if_entry menu_entry choice_entry
 
-%{
-/* Include zconf.hash.c here so it can see the token constants. */
-#include "zconf.hash.c"
-%}
-
 %%
-input: nl start | start;
+input: mainmenu_stmt stmt_list | stmt_list;
 
-start: mainmenu_stmt stmt_list | stmt_list;
+/* mainmenu entry */
+
+mainmenu_stmt: T_MAINMENU prompt T_EOL
+{
+	menu_add_prompt(P_MENU, $2, NULL);
+};
 
 stmt_list:
 	  /* empty */
 	| stmt_list common_stmt
 	| stmt_list choice_stmt
 	| stmt_list menu_stmt
-	| stmt_list end			{ zconf_error("unexpected end statement"); }
 	| stmt_list T_WORD error T_EOL	{ zconf_error("unknown statement \"%s\"", $2); }
-	| stmt_list option_name error T_EOL
-{
-	zconf_error("unexpected option \"%s\"", kconf_id_strings + $2->name);
-}
 	| stmt_list error T_EOL		{ zconf_error("invalid statement"); }
 ;
 
-option_name:
-	T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_OPTIONAL | T_RANGE | T_DEFAULT | T_VISIBLE
-;
-
 common_stmt:
-	  T_EOL
-	| if_stmt
+	  if_stmt
 	| comment_stmt
 	| config_stmt
 	| menuconfig_stmt
 	| source_stmt
+	| assignment_stmt
 ;
 
-option_error:
-	  T_WORD error T_EOL		{ zconf_error("unknown option \"%s\"", $1); }
-	| error T_EOL			{ zconf_error("invalid option"); }
-;
-
-
 /* config/menuconfig entry */
 
-config_entry_start: T_CONFIG T_WORD T_EOL
+config_entry_start: T_CONFIG nonconst_symbol T_EOL
 {
-	struct symbol *sym = sym_lookup($2, 0);
-	sym->flags |= SYMBOL_OPTIONAL;
-	menu_add_entry(sym);
-	printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), $2);
+	$2->flags |= SYMBOL_OPTIONAL;
+	menu_add_entry($2);
+	printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), $2->name);
 };
 
 config_stmt: config_entry_start config_option_list
 {
-	menu_end_entry();
 	printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
 };
 
-menuconfig_entry_start: T_MENUCONFIG T_WORD T_EOL
+menuconfig_entry_start: T_MENUCONFIG nonconst_symbol T_EOL
 {
-	struct symbol *sym = sym_lookup($2, 0);
-	sym->flags |= SYMBOL_OPTIONAL;
-	menu_add_entry(sym);
-	printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", zconf_curname(), zconf_lineno(), $2);
+	$2->flags |= SYMBOL_OPTIONAL;
+	menu_add_entry($2);
+	printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", zconf_curname(), zconf_lineno(), $2->name);
 };
 
 menuconfig_stmt: menuconfig_entry_start config_option_list
@@ -172,26 +163,22 @@  menuconfig_stmt: menuconfig_entry_start config_option_list
 		current_entry->prompt->type = P_MENU;
 	else
 		zconfprint("warning: menuconfig statement without prompt");
-	menu_end_entry();
 	printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
 };
 
 config_option_list:
 	  /* empty */
 	| config_option_list config_option
-	| config_option_list symbol_option
 	| config_option_list depends
 	| config_option_list help
-	| config_option_list option_error
-	| config_option_list T_EOL
 ;
 
-config_option: T_TYPE prompt_stmt_opt T_EOL
+config_option: type prompt_stmt_opt T_EOL
 {
-	menu_set_type($1->stype);
+	menu_set_type($1);
 	printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
 		zconf_curname(), zconf_lineno(),
-		$1->stype);
+		$1);
 };
 
 config_option: T_PROMPT prompt if_expr T_EOL
@@ -200,56 +187,58 @@  config_option: T_PROMPT prompt if_expr T_EOL
 	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
 };
 
-config_option: T_DEFAULT expr if_expr T_EOL
+config_option: default expr if_expr T_EOL
 {
 	menu_add_expr(P_DEFAULT, $2, $3);
-	if ($1->stype != S_UNKNOWN)
-		menu_set_type($1->stype);
+	if ($1 != S_UNKNOWN)
+		menu_set_type($1);
 	printd(DEBUG_PARSE, "%s:%d:default(%u)\n",
 		zconf_curname(), zconf_lineno(),
-		$1->stype);
+		$1);
 };
 
-config_option: T_SELECT T_WORD if_expr T_EOL
+config_option: T_SELECT nonconst_symbol if_expr T_EOL
 {
-	menu_add_symbol(P_SELECT, sym_lookup($2, 0), $3);
+	menu_add_symbol(P_SELECT, $2, $3);
 	printd(DEBUG_PARSE, "%s:%d:select\n", zconf_curname(), zconf_lineno());
 };
 
+config_option: T_IMPLY nonconst_symbol if_expr T_EOL
+{
+	menu_add_symbol(P_IMPLY, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:imply\n", zconf_curname(), zconf_lineno());
+};
+
 config_option: T_RANGE symbol symbol if_expr T_EOL
 {
 	menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,$2, $3), $4);
 	printd(DEBUG_PARSE, "%s:%d:range\n", zconf_curname(), zconf_lineno());
 };
 
-symbol_option: T_OPTION symbol_option_list T_EOL
-;
+config_option: T_OPTION T_MODULES T_EOL
+{
+	menu_add_option_modules();
+};
 
-symbol_option_list:
-	  /* empty */
-	| symbol_option_list T_WORD symbol_option_arg
+config_option: T_OPTION T_DEFCONFIG_LIST T_EOL
 {
-	const struct kconf_id *id = kconf_id_lookup($2, strlen($2));
-	if (id && id->flags & TF_OPTION)
-		menu_add_option(id->token, $3);
-	else
-		zconfprint("warning: ignoring unknown option %s", $2);
-	free($2);
+	menu_add_option_defconfig_list();
 };
 
-symbol_option_arg:
-	  /* empty */		{ $$ = NULL; }
-	| T_EQUAL prompt	{ $$ = $2; }
-;
+config_option: T_OPTION T_ALLNOCONFIG_Y T_EOL
+{
+	menu_add_option_allnoconfig_y();
+};
 
 /* choice entry */
 
 choice: T_CHOICE word_opt T_EOL
 {
 	struct symbol *sym = sym_lookup($2, SYMBOL_CHOICE);
-	sym->flags |= SYMBOL_AUTO;
+	sym->flags |= SYMBOL_NO_WRITE;
 	menu_add_entry(sym);
 	menu_add_expr(P_CHOICE, NULL, NULL);
+	free($2);
 	printd(DEBUG_PARSE, "%s:%d:choice\n", zconf_curname(), zconf_lineno());
 };
 
@@ -260,7 +249,7 @@  choice_entry: choice choice_option_list
 
 choice_end: end
 {
-	if (zconf_endtoken($1, T_CHOICE, T_ENDCHOICE)) {
+	if (zconf_endtoken($1, "choice")) {
 		menu_end_menu();
 		printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
 	}
@@ -274,8 +263,6 @@  choice_option_list:
 	| choice_option_list choice_option
 	| choice_option_list depends
 	| choice_option_list help
-	| choice_option_list T_EOL
-	| choice_option_list option_error
 ;
 
 choice_option: T_PROMPT prompt if_expr T_EOL
@@ -284,15 +271,11 @@  choice_option: T_PROMPT prompt if_expr T_EOL
 	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
 };
 
-choice_option: T_TYPE prompt_stmt_opt T_EOL
+choice_option: logic_type prompt_stmt_opt T_EOL
 {
-	if ($1->stype == S_BOOLEAN || $1->stype == S_TRISTATE) {
-		menu_set_type($1->stype);
-		printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
-			zconf_curname(), zconf_lineno(),
-			$1->stype);
-	} else
-		YYERROR;
+	menu_set_type($1);
+	printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
+	       zconf_curname(), zconf_lineno(), $1);
 };
 
 choice_option: T_OPTIONAL T_EOL
@@ -301,16 +284,28 @@  choice_option: T_OPTIONAL T_EOL
 	printd(DEBUG_PARSE, "%s:%d:optional\n", zconf_curname(), zconf_lineno());
 };
 
-choice_option: T_DEFAULT T_WORD if_expr T_EOL
+choice_option: T_DEFAULT nonconst_symbol if_expr T_EOL
 {
-	if ($1->stype == S_UNKNOWN) {
-		menu_add_symbol(P_DEFAULT, sym_lookup($2, 0), $3);
-		printd(DEBUG_PARSE, "%s:%d:default\n",
-			zconf_curname(), zconf_lineno());
-	} else
-		YYERROR;
+	menu_add_symbol(P_DEFAULT, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:default\n",
+	       zconf_curname(), zconf_lineno());
 };
 
+type:
+	  logic_type
+	| T_INT			{ $$ = S_INT; }
+	| T_HEX			{ $$ = S_HEX; }
+	| T_STRING		{ $$ = S_STRING; }
+
+logic_type:
+	  T_BOOL		{ $$ = S_BOOLEAN; }
+	| T_TRISTATE		{ $$ = S_TRISTATE; }
+
+default:
+	  T_DEFAULT		{ $$ = S_UNKNOWN; }
+	| T_DEF_BOOL		{ $$ = S_BOOLEAN; }
+	| T_DEF_TRISTATE	{ $$ = S_TRISTATE; }
+
 choice_block:
 	  /* empty */
 	| choice_block common_stmt
@@ -318,7 +313,7 @@  choice_block:
 
 /* if entry */
 
-if_entry: T_IF expr nl
+if_entry: T_IF expr T_EOL
 {
 	printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
 	menu_add_entry(NULL);
@@ -328,29 +323,15 @@  if_entry: T_IF expr nl
 
 if_end: end
 {
-	if (zconf_endtoken($1, T_IF, T_ENDIF)) {
+	if (zconf_endtoken($1, "if")) {
 		menu_end_menu();
 		printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
 	}
 };
 
-if_stmt: if_entry if_block if_end
+if_stmt: if_entry stmt_list if_end
 ;
 
-if_block:
-	  /* empty */
-	| if_block common_stmt
-	| if_block menu_stmt
-	| if_block choice_stmt
-;
-
-/* mainmenu entry */
-
-mainmenu_stmt: T_MAINMENU prompt nl
-{
-	menu_add_prompt(P_MENU, $2, NULL);
-};
-
 /* menu entry */
 
 menu: T_MENU prompt T_EOL
@@ -360,33 +341,33 @@  menu: T_MENU prompt T_EOL
 	printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
 };
 
-menu_entry: menu visibility_list depends_list
+menu_entry: menu menu_option_list
 {
 	$$ = menu_add_menu();
 };
 
 menu_end: end
 {
-	if (zconf_endtoken($1, T_MENU, T_ENDMENU)) {
+	if (zconf_endtoken($1, "menu")) {
 		menu_end_menu();
 		printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
 	}
 };
 
-menu_stmt: menu_entry menu_block menu_end
+menu_stmt: menu_entry stmt_list menu_end
 ;
 
-menu_block:
+menu_option_list:
 	  /* empty */
-	| menu_block common_stmt
-	| menu_block menu_stmt
-	| menu_block choice_stmt
+	| menu_option_list visible
+	| menu_option_list depends
 ;
 
 source_stmt: T_SOURCE prompt T_EOL
 {
 	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
 	zconf_nextfile($2);
+	free($2);
 };
 
 /* comment entry */
@@ -398,10 +379,13 @@  comment: T_COMMENT prompt T_EOL
 	printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
 };
 
-comment_stmt: comment depends_list
-{
-	menu_end_entry();
-};
+comment_stmt: comment comment_option_list
+;
+
+comment_option_list:
+	  /* empty */
+	| comment_option_list depends
+;
 
 /* help option */
 
@@ -413,18 +397,22 @@  help_start: T_HELP T_EOL
 
 help: help_start T_HELPTEXT
 {
+	if (current_entry->help) {
+		free(current_entry->help);
+		zconfprint("warning: '%s' defined with more than one help text -- only the last one will be used",
+			   current_entry->sym->name ?: "<choice>");
+	}
+
+	/* Is the help text empty or all whitespace? */
+	if ($2[strspn($2, " \f\n\r\t\v")] == '\0')
+		zconfprint("warning: '%s' defined with blank help text",
+			   current_entry->sym->name ?: "<choice>");
+
 	current_entry->help = $2;
 };
 
 /* depends option */
 
-depends_list:
-	  /* empty */
-	| depends_list depends
-	| depends_list T_EOL
-	| depends_list option_error
-;
-
 depends: T_DEPENDS T_ON expr T_EOL
 {
 	menu_add_dep($3);
@@ -432,14 +420,7 @@  depends: T_DEPENDS T_ON expr T_EOL
 };
 
 /* visibility option */
-
-visibility_list:
-	  /* empty */
-	| visibility_list visible
-	| visibility_list T_EOL
-;
-
-visible: T_VISIBLE if_expr
+visible: T_VISIBLE if_expr T_EOL
 {
 	menu_add_visibility($2);
 };
@@ -457,14 +438,9 @@  prompt:	  T_WORD
 	| T_WORD_QUOTE
 ;
 
-end:	  T_ENDMENU T_EOL	{ $$ = $1; }
-	| T_ENDCHOICE T_EOL	{ $$ = $1; }
-	| T_ENDIF T_EOL		{ $$ = $1; }
-;
-
-nl:
-	  T_EOL
-	| nl T_EOL
+end:	  T_ENDMENU T_EOL	{ $$ = "menu"; }
+	| T_ENDCHOICE T_EOL	{ $$ = "choice"; }
+	| T_ENDIF T_EOL		{ $$ = "if"; }
 ;
 
 if_expr:  /* empty */			{ $$ = NULL; }
@@ -484,13 +460,31 @@  expr:	  symbol				{ $$ = expr_alloc_symbol($1); }
 	| expr T_AND expr			{ $$ = expr_alloc_two(E_AND, $1, $3); }
 ;
 
-symbol:	  T_WORD	{ $$ = sym_lookup($1, 0); free($1); }
+/* For symbol definitions, selects, etc., where quotes are not accepted */
+nonconst_symbol: T_WORD { $$ = sym_lookup($1, 0); free($1); };
+
+symbol:	  nonconst_symbol
 	| T_WORD_QUOTE	{ $$ = sym_lookup($1, SYMBOL_CONST); free($1); }
 ;
 
 word_opt: /* empty */			{ $$ = NULL; }
 	| T_WORD
 
+/* assignment statement */
+
+assignment_stmt:  T_WORD assign_op assign_val T_EOL	{ variable_add($1, $3, $2); free($1); free($3); }
+
+assign_op:
+	  T_EQUAL	{ $$ = VAR_RECURSIVE; }
+	| T_COLON_EQUAL	{ $$ = VAR_SIMPLE; }
+	| T_PLUS_EQUAL	{ $$ = VAR_APPEND; }
+;
+
+assign_val:
+	/* empty */		{ $$ = xstrdup(""); };
+	| T_ASSIGN_VAL
+;
+
 %%
 
 void conf_parse(const char *name)
@@ -500,61 +494,51 @@  void conf_parse(const char *name)
 
 	zconf_initscan(name);
 
-	sym_init();
 	_menu_init();
-	rootmenu.prompt = menu_add_prompt(P_MENU, "Linux Kernel Configuration", NULL);
 
 	if (getenv("ZCONF_DEBUG"))
-		zconfdebug = 1;
-	zconfparse();
-	if (zconfnerrs)
+		yydebug = 1;
+	yyparse();
+
+	/* Variables are expanded in the parse phase. We can free them here. */
+	variable_all_del();
+
+	if (yynerrs)
 		exit(1);
 	if (!modules_sym)
 		modules_sym = sym_find( "n" );
 
-	rootmenu.prompt->text = rootmenu.prompt->text;
-	rootmenu.prompt->text = sym_expand_string_value(rootmenu.prompt->text);
+	if (!menu_has_prompt(&rootmenu)) {
+		current_entry = &rootmenu;
+		menu_add_prompt(P_MENU, "Main menu", NULL);
+	}
 
 	menu_finalize(&rootmenu);
 	for_all_symbols(i, sym) {
 		if (sym_check_deps(sym))
-			zconfnerrs++;
+			yynerrs++;
 	}
-	if (zconfnerrs)
+	if (yynerrs)
 		exit(1);
 	sym_set_change_count(1);
 }
 
-static const char *zconf_tokenname(int token)
-{
-	switch (token) {
-	case T_MENU:		return "menu";
-	case T_ENDMENU:		return "endmenu";
-	case T_CHOICE:		return "choice";
-	case T_ENDCHOICE:	return "endchoice";
-	case T_IF:		return "if";
-	case T_ENDIF:		return "endif";
-	case T_DEPENDS:		return "depends";
-	case T_VISIBLE:		return "visible";
-	}
-	return "<token>";
-}
-
-static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int endtoken)
+static bool zconf_endtoken(const char *tokenname,
+			   const char *expected_tokenname)
 {
-	if (id->token != endtoken) {
+	if (strcmp(tokenname, expected_tokenname)) {
 		zconf_error("unexpected '%s' within %s block",
-			kconf_id_strings + id->name, zconf_tokenname(starttoken));
-		zconfnerrs++;
+			    tokenname, expected_tokenname);
+		yynerrs++;
 		return false;
 	}
 	if (current_menu->file != current_file) {
 		zconf_error("'%s' in different file than '%s'",
-			kconf_id_strings + id->name, zconf_tokenname(starttoken));
+			    tokenname, expected_tokenname);
 		fprintf(stderr, "%s:%d: location of the '%s'\n",
 			current_menu->file->name, current_menu->lineno,
-			zconf_tokenname(starttoken));
-		zconfnerrs++;
+			expected_tokenname);
+		yynerrs++;
 		return false;
 	}
 	return true;
@@ -575,7 +559,7 @@  static void zconf_error(const char *err, ...)
 {
 	va_list ap;
 
-	zconfnerrs++;
+	yynerrs++;
 	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
 	va_start(ap, err);
 	vfprintf(stderr, err, ap);
@@ -583,7 +567,7 @@  static void zconf_error(const char *err, ...)
 	fprintf(stderr, "\n");
 }
 
-static void zconferror(const char *err)
+static void yyerror(const char *err)
 {
 	fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
 }
@@ -616,7 +600,7 @@  static void print_symbol(FILE *out, struct menu *menu)
 		fprintf(out, "\nconfig %s\n", sym->name);
 	switch (sym->type) {
 	case S_BOOLEAN:
-		fputs("  boolean\n", out);
+		fputs("  bool\n", out);
 		break;
 	case S_TRISTATE:
 		fputs("  tristate\n", out);
@@ -664,6 +648,11 @@  static void print_symbol(FILE *out, struct menu *menu)
 			expr_fprint(prop->expr, out);
 			fputc('\n', out);
 			break;
+		case P_IMPLY:
+			fputs( "  imply ", out);
+			expr_fprint(prop->expr, out);
+			fputc('\n', out);
+			break;
 		case P_RANGE:
 			fputs( "  range ", out);
 			expr_fprint(prop->expr, out);
@@ -674,6 +663,10 @@  static void print_symbol(FILE *out, struct menu *menu)
 			print_quoted_string(out, prop->text);
 			fputc('\n', out);
 			break;
+		case P_SYMBOL:
+			fputs( "  symbol ", out);
+			fprintf(out, "%s\n", prop->sym->name);
+			break;
 		default:
 			fprintf(out, "  unknown prop %d!\n", prop->type);
 			break;
@@ -734,9 +727,5 @@  void zconfdump(FILE *out)
 	}
 }
 
-#include "zconf.lex.c"
 #include "util.c"
-#include "confdata.c"
-#include "expr.c"
-#include "symbol.c"
 #include "menu.c"
diff --git a/xen/tools/kconfig/preprocess.c b/xen/tools/kconfig/preprocess.c
new file mode 100644
index 000000000000..0243086fb168
--- /dev/null
+++ b/xen/tools/kconfig/preprocess.c
@@ -0,0 +1,574 @@ 
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "list.h"
+#include "lkc.h"
+
+#define ARRAY_SIZE(arr)		(sizeof(arr) / sizeof((arr)[0]))
+
+static char *expand_string_with_args(const char *in, int argc, char *argv[]);
+static char *expand_string(const char *in);
+
+static void __attribute__((noreturn)) pperror(const char *format, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, "%s:%d: ", current_file->name, yylineno);
+	va_start(ap, format);
+	vfprintf(stderr, format, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+
+	exit(1);
+}
+
+/*
+ * Environment variables
+ */
+static LIST_HEAD(env_list);
+
+struct env {
+	char *name;
+	char *value;
+	struct list_head node;
+};
+
+static void env_add(const char *name, const char *value)
+{
+	struct env *e;
+
+	e = xmalloc(sizeof(*e));
+	e->name = xstrdup(name);
+	e->value = xstrdup(value);
+
+	list_add_tail(&e->node, &env_list);
+}
+
+static void env_del(struct env *e)
+{
+	list_del(&e->node);
+	free(e->name);
+	free(e->value);
+	free(e);
+}
+
+/* The returned pointer must be freed when done */
+static char *env_expand(const char *name)
+{
+	struct env *e;
+	const char *value;
+
+	if (!*name)
+		return NULL;
+
+	list_for_each_entry(e, &env_list, node) {
+		if (!strcmp(name, e->name))
+			return xstrdup(e->value);
+	}
+
+	value = getenv(name);
+	if (!value)
+		return NULL;
+
+	/*
+	 * We need to remember all referenced environment variables.
+	 * They will be written out to include/config/auto.conf.cmd
+	 */
+	env_add(name, value);
+
+	return xstrdup(value);
+}
+
+void env_write_dep(FILE *f, const char *autoconfig_name)
+{
+	struct env *e, *tmp;
+
+	list_for_each_entry_safe(e, tmp, &env_list, node) {
+		fprintf(f, "ifneq \"$(%s)\" \"%s\"\n", e->name, e->value);
+		fprintf(f, "%s: FORCE\n", autoconfig_name);
+		fprintf(f, "endif\n");
+		env_del(e);
+	}
+}
+
+/*
+ * Built-in functions
+ */
+struct function {
+	const char *name;
+	unsigned int min_args;
+	unsigned int max_args;
+	char *(*func)(int argc, char *argv[]);
+};
+
+static char *do_error_if(int argc, char *argv[])
+{
+	if (!strcmp(argv[0], "y"))
+		pperror("%s", argv[1]);
+
+	return NULL;
+}
+
+static char *do_filename(int argc, char *argv[])
+{
+	return xstrdup(current_file->name);
+}
+
+static char *do_info(int argc, char *argv[])
+{
+	printf("%s\n", argv[0]);
+
+	return xstrdup("");
+}
+
+static char *do_lineno(int argc, char *argv[])
+{
+	char buf[16];
+
+	sprintf(buf, "%d", yylineno);
+
+	return xstrdup(buf);
+}
+
+static char *do_shell(int argc, char *argv[])
+{
+	FILE *p;
+	char buf[256];
+	char *cmd;
+	size_t nread;
+	int i;
+
+	cmd = argv[0];
+
+	p = popen(cmd, "r");
+	if (!p) {
+		perror(cmd);
+		exit(1);
+	}
+
+	nread = fread(buf, 1, sizeof(buf), p);
+	if (nread == sizeof(buf))
+		nread--;
+
+	/* remove trailing new lines */
+	while (nread > 0 && buf[nread - 1] == '\n')
+		nread--;
+
+	buf[nread] = 0;
+
+	/* replace a new line with a space */
+	for (i = 0; i < nread; i++) {
+		if (buf[i] == '\n')
+			buf[i] = ' ';
+	}
+
+	if (pclose(p) == -1) {
+		perror(cmd);
+		exit(1);
+	}
+
+	return xstrdup(buf);
+}
+
+static char *do_warning_if(int argc, char *argv[])
+{
+	if (!strcmp(argv[0], "y"))
+		fprintf(stderr, "%s:%d: %s\n",
+			current_file->name, yylineno, argv[1]);
+
+	return xstrdup("");
+}
+
+static const struct function function_table[] = {
+	/* Name		MIN	MAX	Function */
+	{ "error-if",	2,	2,	do_error_if },
+	{ "filename",	0,	0,	do_filename },
+	{ "info",	1,	1,	do_info },
+	{ "lineno",	0,	0,	do_lineno },
+	{ "shell",	1,	1,	do_shell },
+	{ "warning-if",	2,	2,	do_warning_if },
+};
+
+#define FUNCTION_MAX_ARGS		16
+
+static char *function_expand(const char *name, int argc, char *argv[])
+{
+	const struct function *f;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(function_table); i++) {
+		f = &function_table[i];
+		if (strcmp(f->name, name))
+			continue;
+
+		if (argc < f->min_args)
+			pperror("too few function arguments passed to '%s'",
+				name);
+
+		if (argc > f->max_args)
+			pperror("too many function arguments passed to '%s'",
+				name);
+
+		return f->func(argc, argv);
+	}
+
+	return NULL;
+}
+
+/*
+ * Variables (and user-defined functions)
+ */
+static LIST_HEAD(variable_list);
+
+struct variable {
+	char *name;
+	char *value;
+	enum variable_flavor flavor;
+	int exp_count;
+	struct list_head node;
+};
+
+static struct variable *variable_lookup(const char *name)
+{
+	struct variable *v;
+
+	list_for_each_entry(v, &variable_list, node) {
+		if (!strcmp(name, v->name))
+			return v;
+	}
+
+	return NULL;
+}
+
+static char *variable_expand(const char *name, int argc, char *argv[])
+{
+	struct variable *v;
+	char *res;
+
+	v = variable_lookup(name);
+	if (!v)
+		return NULL;
+
+	if (argc == 0 && v->exp_count)
+		pperror("Recursive variable '%s' references itself (eventually)",
+			name);
+
+	if (v->exp_count > 1000)
+		pperror("Too deep recursive expansion");
+
+	v->exp_count++;
+
+	if (v->flavor == VAR_RECURSIVE)
+		res = expand_string_with_args(v->value, argc, argv);
+	else
+		res = xstrdup(v->value);
+
+	v->exp_count--;
+
+	return res;
+}
+
+void variable_add(const char *name, const char *value,
+		  enum variable_flavor flavor)
+{
+	struct variable *v;
+	char *new_value;
+	bool append = false;
+
+	v = variable_lookup(name);
+	if (v) {
+		/* For defined variables, += inherits the existing flavor */
+		if (flavor == VAR_APPEND) {
+			flavor = v->flavor;
+			append = true;
+		} else {
+			free(v->value);
+		}
+	} else {
+		/* For undefined variables, += assumes the recursive flavor */
+		if (flavor == VAR_APPEND)
+			flavor = VAR_RECURSIVE;
+
+		v = xmalloc(sizeof(*v));
+		v->name = xstrdup(name);
+		v->exp_count = 0;
+		list_add_tail(&v->node, &variable_list);
+	}
+
+	v->flavor = flavor;
+
+	if (flavor == VAR_SIMPLE)
+		new_value = expand_string(value);
+	else
+		new_value = xstrdup(value);
+
+	if (append) {
+		v->value = xrealloc(v->value,
+				    strlen(v->value) + strlen(new_value) + 2);
+		strcat(v->value, " ");
+		strcat(v->value, new_value);
+		free(new_value);
+	} else {
+		v->value = new_value;
+	}
+}
+
+static void variable_del(struct variable *v)
+{
+	list_del(&v->node);
+	free(v->name);
+	free(v->value);
+	free(v);
+}
+
+void variable_all_del(void)
+{
+	struct variable *v, *tmp;
+
+	list_for_each_entry_safe(v, tmp, &variable_list, node)
+		variable_del(v);
+}
+
+/*
+ * Evaluate a clause with arguments.  argc/argv are arguments from the upper
+ * function call.
+ *
+ * Returned string must be freed when done
+ */
+static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
+{
+	char *tmp, *name, *res, *endptr, *prev, *p;
+	int new_argc = 0;
+	char *new_argv[FUNCTION_MAX_ARGS];
+	int nest = 0;
+	int i;
+	unsigned long n;
+
+	tmp = xstrndup(str, len);
+
+	/*
+	 * If variable name is '1', '2', etc.  It is generally an argument
+	 * from a user-function call (i.e. local-scope variable).  If not
+	 * available, then look-up global-scope variables.
+	 */
+	n = strtoul(tmp, &endptr, 10);
+	if (!*endptr && n > 0 && n <= argc) {
+		res = xstrdup(argv[n - 1]);
+		goto free_tmp;
+	}
+
+	prev = p = tmp;
+
+	/*
+	 * Split into tokens
+	 * The function name and arguments are separated by a comma.
+	 * For example, if the function call is like this:
+	 *   $(foo,$(x),$(y))
+	 *
+	 * The input string for this helper should be:
+	 *   foo,$(x),$(y)
+	 *
+	 * and split into:
+	 *   new_argv[0] = 'foo'
+	 *   new_argv[1] = '$(x)'
+	 *   new_argv[2] = '$(y)'
+	 */
+	while (*p) {
+		if (nest == 0 && *p == ',') {
+			*p = 0;
+			if (new_argc >= FUNCTION_MAX_ARGS)
+				pperror("too many function arguments");
+			new_argv[new_argc++] = prev;
+			prev = p + 1;
+		} else if (*p == '(') {
+			nest++;
+		} else if (*p == ')') {
+			nest--;
+		}
+
+		p++;
+	}
+	new_argv[new_argc++] = prev;
+
+	/*
+	 * Shift arguments
+	 * new_argv[0] represents a function name or a variable name.  Put it
+	 * into 'name', then shift the rest of the arguments.  This simplifies
+	 * 'const' handling.
+	 */
+	name = expand_string_with_args(new_argv[0], argc, argv);
+	new_argc--;
+	for (i = 0; i < new_argc; i++)
+		new_argv[i] = expand_string_with_args(new_argv[i + 1],
+						      argc, argv);
+
+	/* Search for variables */
+	res = variable_expand(name, new_argc, new_argv);
+	if (res)
+		goto free;
+
+	/* Look for built-in functions */
+	res = function_expand(name, new_argc, new_argv);
+	if (res)
+		goto free;
+
+	/* Last, try environment variable */
+	if (new_argc == 0) {
+		res = env_expand(name);
+		if (res)
+			goto free;
+	}
+
+	res = xstrdup("");
+free:
+	for (i = 0; i < new_argc; i++)
+		free(new_argv[i]);
+	free(name);
+free_tmp:
+	free(tmp);
+
+	return res;
+}
+
+/*
+ * Expand a string that follows '$'
+ *
+ * For example, if the input string is
+ *     ($(FOO)$($(BAR)))$(BAZ)
+ * this helper evaluates
+ *     $($(FOO)$($(BAR)))
+ * and returns a new string containing the expansion (note that the string is
+ * recursively expanded), also advancing 'str' to point to the next character
+ * after the corresponding closing parenthesis, in this case, *str will be
+ *     $(BAR)
+ */
+static char *expand_dollar_with_args(const char **str, int argc, char *argv[])
+{
+	const char *p = *str;
+	const char *q;
+	int nest = 0;
+
+	/*
+	 * In Kconfig, variable/function references always start with "$(".
+	 * Neither single-letter variables as in $A nor curly braces as in ${CC}
+	 * are supported.  '$' not followed by '(' loses its special meaning.
+	 */
+	if (*p != '(') {
+		*str = p;
+		return xstrdup("$");
+	}
+
+	p++;
+	q = p;
+	while (*q) {
+		if (*q == '(') {
+			nest++;
+		} else if (*q == ')') {
+			if (nest-- == 0)
+				break;
+		}
+		q++;
+	}
+
+	if (!*q)
+		pperror("unterminated reference to '%s': missing ')'", p);
+
+	/* Advance 'str' to after the expanded initial portion of the string */
+	*str = q + 1;
+
+	return eval_clause(p, q - p, argc, argv);
+}
+
+char *expand_dollar(const char **str)
+{
+	return expand_dollar_with_args(str, 0, NULL);
+}
+
+static char *__expand_string(const char **str, bool (*is_end)(char c),
+			     int argc, char *argv[])
+{
+	const char *in, *p;
+	char *expansion, *out;
+	size_t in_len, out_len;
+
+	out = xmalloc(1);
+	*out = 0;
+	out_len = 1;
+
+	p = in = *str;
+
+	while (1) {
+		if (*p == '$') {
+			in_len = p - in;
+			p++;
+			expansion = expand_dollar_with_args(&p, argc, argv);
+			out_len += in_len + strlen(expansion);
+			out = xrealloc(out, out_len);
+			strncat(out, in, in_len);
+			strcat(out, expansion);
+			free(expansion);
+			in = p;
+			continue;
+		}
+
+		if (is_end(*p))
+			break;
+
+		p++;
+	}
+
+	in_len = p - in;
+	out_len += in_len;
+	out = xrealloc(out, out_len);
+	strncat(out, in, in_len);
+
+	/* Advance 'str' to the end character */
+	*str = p;
+
+	return out;
+}
+
+static bool is_end_of_str(char c)
+{
+	return !c;
+}
+
+/*
+ * Expand variables and functions in the given string.  Undefined variables
+ * expand to an empty string.
+ * The returned string must be freed when done.
+ */
+static char *expand_string_with_args(const char *in, int argc, char *argv[])
+{
+	return __expand_string(&in, is_end_of_str, argc, argv);
+}
+
+static char *expand_string(const char *in)
+{
+	return expand_string_with_args(in, 0, NULL);
+}
+
+static bool is_end_of_token(char c)
+{
+	return !(isalnum(c) || c == '_' || c == '-');
+}
+
+/*
+ * Expand variables in a token.  The parsing stops when a token separater
+ * (in most cases, it is a whitespace) is encountered.  'str' is updated to
+ * point to the next character.
+ *
+ * The returned string must be freed when done.
+ */
+char *expand_one_token(const char **str)
+{
+	return __expand_string(str, is_end_of_token, 0, NULL);
+}
diff --git a/xen/tools/kconfig/qconf-cfg.sh b/xen/tools/kconfig/qconf-cfg.sh
new file mode 100755
index 000000000000..02ccc0ae1031
--- /dev/null
+++ b/xen/tools/kconfig/qconf-cfg.sh
@@ -0,0 +1,32 @@ 
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+PKG="Qt5Core Qt5Gui Qt5Widgets"
+PKG2="QtCore QtGui"
+
+if [ -z "$(command -v pkg-config)" ]; then
+	echo >&2 "*"
+	echo >&2 "* 'make xconfig' requires 'pkg-config'. Please install it."
+	echo >&2 "*"
+	exit 1
+fi
+
+if pkg-config --exists $PKG; then
+	echo cflags=\"-std=c++11 -fPIC $(pkg-config --cflags Qt5Core Qt5Gui Qt5Widgets)\"
+	echo libs=\"$(pkg-config --libs $PKG)\"
+	echo moc=\"$(pkg-config --variable=host_bins Qt5Core)/moc\"
+	exit 0
+fi
+
+if pkg-config --exists $PKG2; then
+	echo cflags=\"$(pkg-config --cflags $PKG2)\"
+	echo libs=\"$(pkg-config --libs $PKG2)\"
+	echo moc=\"$(pkg-config --variable=moc_location QtCore)\"
+	exit 0
+fi
+
+echo >&2 "*"
+echo >&2 "* Could not find Qt via pkg-config."
+echo >&2 "* Please install either Qt 4.8 or 5.x. and make sure it's in PKG_CONFIG_PATH"
+echo >&2 "*"
+exit 1
diff --git a/xen/tools/kconfig/qconf.cc b/xen/tools/kconfig/qconf.cc
index e140ab00abcf..82773cc35d35 100644
--- a/xen/tools/kconfig/qconf.cc
+++ b/xen/tools/kconfig/qconf.cc
@@ -1,32 +1,17 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
+ * Copyright (C) 2015 Boris Barbulovski <bbarbulovski@gmail.com>
  */
 
 #include <qglobal.h>
 
-#if QT_VERSION < 0x040000
-#include <stddef.h>
-#include <qmainwindow.h>
-#include <qvbox.h>
-#include <qvaluelist.h>
+#include <QMainWindow>
+#include <QList>
 #include <qtextbrowser.h>
-#include <qaction.h>
-#include <qheader.h>
-#include <qfiledialog.h>
-#include <qdragobject.h>
-#include <qpopupmenu.h>
-#else
-#include <q3mainwindow.h>
-#include <q3vbox.h>
-#include <q3valuelist.h>
-#include <q3textbrowser.h>
-#include <q3action.h>
-#include <q3header.h>
-#include <q3filedialog.h>
-#include <q3dragobject.h>
-#include <q3popupmenu.h>
-#endif
+#include <QAction>
+#include <QFileDialog>
+#include <QMenu>
 
 #include <qapplication.h>
 #include <qdesktopwidget.h>
@@ -47,13 +32,13 @@ 
 #include "qconf.h"
 
 #include "qconf.moc"
-#include "images.c"
+#include "images.h"
 
 
 static QApplication *configApp;
 static ConfigSettings *configSettings;
 
-Q3Action *ConfigMainWindow::saveAction;
+QAction *ConfigMainWindow::saveAction;
 
 static inline QString qgettext(const char* str)
 {
@@ -68,14 +53,22 @@  ConfigSettings::ConfigSettings()
 /**
  * Reads a list of integer values from the application settings.
  */
-Q3ValueList<int> ConfigSettings::readSizes(const QString& key, bool *ok)
+QList<int> ConfigSettings::readSizes(const QString& key, bool *ok)
 {
-	Q3ValueList<int> result;
-	QStringList entryList = readListEntry(key, ok);
-	QStringList::Iterator it;
+	QList<int> result;
 
-	for (it = entryList.begin(); it != entryList.end(); ++it)
-		result.push_back((*it).toInt());
+	if (contains(key))
+	{
+		QStringList entryList = value(key).toStringList();
+		QStringList::Iterator it;
+
+		for (it = entryList.begin(); it != entryList.end(); ++it)
+			result.push_back((*it).toInt());
+
+		*ok = true;
+	}
+	else
+		*ok = false;
 
 	return result;
 }
@@ -83,14 +76,16 @@  Q3ValueList<int> ConfigSettings::readSizes(const QString& key, bool *ok)
 /**
  * Writes a list of integer values to the application settings.
  */
-bool ConfigSettings::writeSizes(const QString& key, const Q3ValueList<int>& value)
+bool ConfigSettings::writeSizes(const QString& key, const QList<int>& value)
 {
 	QStringList stringList;
-	Q3ValueList<int>::ConstIterator it;
+	QList<int>::ConstIterator it;
 
 	for (it = value.begin(); it != value.end(); ++it)
 		stringList.push_back(QString::number(*it));
-	return writeEntry(key, stringList);
+	setValue(key, stringList);
+
+	return true;
 }
 
 
@@ -100,9 +95,6 @@  bool ConfigSettings::writeSizes(const QString& key, const Q3ValueList<int>& valu
  */
 void ConfigItem::okRename(int col)
 {
-	Parent::okRename(col);
-	sym_set_string_value(menu->sym, text(dataColIdx).latin1());
-	listView()->updateList(this);
 }
 
 /*
@@ -140,11 +132,11 @@  void ConfigItem::updateMenu(void)
 		} else {
 			if (sym)
 				break;
-			setPixmap(promptColIdx, 0);
+			setPixmap(promptColIdx, QIcon());
 		}
 		goto set_prompt;
 	case P_COMMENT:
-		setPixmap(promptColIdx, 0);
+		setPixmap(promptColIdx, QIcon());
 		goto set_prompt;
 	default:
 		;
@@ -160,8 +152,8 @@  void ConfigItem::updateMenu(void)
 	case S_TRISTATE:
 		char ch;
 
-		if (!sym_is_changable(sym) && list->optMode == normalOpt) {
-			setPixmap(promptColIdx, 0);
+		if (!sym_is_changeable(sym) && list->optMode == normalOpt) {
+			setPixmap(promptColIdx, QIcon());
 			setText(noColIdx, QString::null);
 			setText(modColIdx, QString::null);
 			setText(yesColIdx, QString::null);
@@ -207,9 +199,6 @@  void ConfigItem::updateMenu(void)
 
 		data = sym_get_string_value(sym);
 
-		int i = list->mapIdx(dataColIdx);
-		if (i >= 0)
-			setRenameEnabled(i, TRUE);
 		setText(dataColIdx, data);
 		if (type == S_STRING)
 			prompt = QString("%1: %2").arg(prompt).arg(data);
@@ -241,18 +230,6 @@  void ConfigItem::testUpdateMenu(bool v)
 		updateMenu();
 }
 
-void ConfigItem::paintCell(QPainter* p, const QColorGroup& cg, int column, int width, int align)
-{
-	ConfigList* list = listView();
-
-	if (visible) {
-		if (isSelected() && !list->hasFocus() && list->mode == menuMode)
-			Parent::paintCell(p, list->inactivedColorGroup, column, width, align);
-		else
-			Parent::paintCell(p, cg, column, width, align);
-	} else
-		Parent::paintCell(p, list->disabledColorGroup, column, width, align);
-}
 
 /*
  * construct a menu entry
@@ -265,7 +242,7 @@  void ConfigItem::init(void)
 		menu->data = this;
 
 		if (list->mode != fullMode)
-			setOpen(TRUE);
+			setExpanded(true);
 		sym_calc_value(menu->sym);
 	}
 	updateMenu();
@@ -290,7 +267,7 @@  ConfigItem::~ConfigItem(void)
 ConfigLineEdit::ConfigLineEdit(ConfigView* parent)
 	: Parent(parent)
 {
-	connect(this, SIGNAL(lostFocus()), SLOT(hide()));
+	connect(this, SIGNAL(editingFinished()), SLOT(hide()));
 }
 
 void ConfigLineEdit::show(ConfigItem* i)
@@ -311,7 +288,7 @@  void ConfigLineEdit::keyPressEvent(QKeyEvent* e)
 		break;
 	case Qt::Key_Return:
 	case Qt::Key_Enter:
-		sym_set_string_value(item->menu->sym, text().latin1());
+		sym_set_string_value(item->menu->sym, text().toLatin1());
 		parent()->updateList(item);
 		break;
 	default:
@@ -324,39 +301,39 @@  void ConfigLineEdit::keyPressEvent(QKeyEvent* e)
 }
 
 ConfigList::ConfigList(ConfigView* p, const char *name)
-	: Parent(p, name),
+	: Parent(p),
 	  updateAll(false),
 	  symbolYesPix(xpm_symbol_yes), symbolModPix(xpm_symbol_mod), symbolNoPix(xpm_symbol_no),
 	  choiceYesPix(xpm_choice_yes), choiceNoPix(xpm_choice_no),
 	  menuPix(xpm_menu), menuInvPix(xpm_menu_inv), menuBackPix(xpm_menuback), voidPix(xpm_void),
-	  showName(false), showRange(false), showData(false), optMode(normalOpt),
+	  showName(false), showRange(false), showData(false), mode(singleMode), optMode(normalOpt),
 	  rootEntry(0), headerPopup(0)
 {
 	int i;
 
-	setSorting(-1);
-	setRootIsDecorated(TRUE);
-	disabledColorGroup = palette().active();
-	disabledColorGroup.setColor(QColorGroup::Text, palette().disabled().text());
-	inactivedColorGroup = palette().active();
-	inactivedColorGroup.setColor(QColorGroup::Highlight, palette().disabled().highlight());
+	setObjectName(name);
+	setSortingEnabled(false);
+	setRootIsDecorated(true);
+
+	setVerticalScrollMode(ScrollPerPixel);
+	setHorizontalScrollMode(ScrollPerPixel);
 
-	connect(this, SIGNAL(selectionChanged(void)),
+	setHeaderLabels(QStringList() << "Option" << "Name" << "N" << "M" << "Y" << "Value");
+
+	connect(this, SIGNAL(itemSelectionChanged(void)),
 		SLOT(updateSelection(void)));
 
 	if (name) {
 		configSettings->beginGroup(name);
-		showName = configSettings->readBoolEntry("/showName", false);
-		showRange = configSettings->readBoolEntry("/showRange", false);
-		showData = configSettings->readBoolEntry("/showData", false);
-		optMode = (enum optionMode)configSettings->readNumEntry("/optionMode", false);
+		showName = configSettings->value("/showName", false).toBool();
+		showRange = configSettings->value("/showRange", false).toBool();
+		showData = configSettings->value("/showData", false).toBool();
+		optMode = (enum optionMode)configSettings->value("/optionMode", 0).toInt();
 		configSettings->endGroup();
 		connect(configApp, SIGNAL(aboutToQuit()), SLOT(saveSettings()));
 	}
 
-	for (i = 0; i < colNr; i++)
-		colMap[i] = colRevMap[i] = -1;
-	addColumn(promptColIdx, "Option");
+	addColumn(promptColIdx);
 
 	reinit();
 }
@@ -381,26 +358,26 @@  void ConfigList::reinit(void)
 	removeColumn(nameColIdx);
 
 	if (showName)
-		addColumn(nameColIdx, "Name");
+		addColumn(nameColIdx);
 	if (showRange) {
-		addColumn(noColIdx, "N");
-		addColumn(modColIdx, "M");
-		addColumn(yesColIdx, "Y");
+		addColumn(noColIdx);
+		addColumn(modColIdx);
+		addColumn(yesColIdx);
 	}
 	if (showData)
-		addColumn(dataColIdx, "Value");
+		addColumn(dataColIdx);
 
 	updateListAll();
 }
 
 void ConfigList::saveSettings(void)
 {
-	if (name()) {
-		configSettings->beginGroup(name());
-		configSettings->writeEntry("/showName", showName);
-		configSettings->writeEntry("/showRange", showRange);
-		configSettings->writeEntry("/showData", showData);
-		configSettings->writeEntry("/optionMode", (int)optMode);
+	if (!objectName().isEmpty()) {
+		configSettings->beginGroup(objectName());
+		configSettings->setValue("/showName", showName);
+		configSettings->setValue("/showRange", showRange);
+		configSettings->setValue("/showData", showData);
+		configSettings->setValue("/optionMode", (int)optMode);
 		configSettings->endGroup();
 	}
 }
@@ -422,7 +399,10 @@  void ConfigList::updateSelection(void)
 	struct menu *menu;
 	enum prop_type type;
 
-	ConfigItem* item = (ConfigItem*)selectedItem();
+	if (selectedItems().count() == 0)
+		return;
+
+	ConfigItem* item = (ConfigItem*)selectedItems().first();
 	if (!item)
 		return;
 
@@ -442,21 +422,23 @@  void ConfigList::updateList(ConfigItem* item)
 	if (!rootEntry) {
 		if (mode != listMode)
 			goto update;
-		Q3ListViewItemIterator it(this);
+		QTreeWidgetItemIterator it(this);
 		ConfigItem* item;
 
-		for (; it.current(); ++it) {
-			item = (ConfigItem*)it.current();
+		while (*it) {
+			item = (ConfigItem*)(*it);
 			if (!item->menu)
 				continue;
 			item->testUpdateMenu(menu_is_visible(item->menu));
+
+			++it;
 		}
 		return;
 	}
 
 	if (rootEntry != &rootmenu && (mode == singleMode ||
 	    (mode == symbolMode && rootEntry->parent != &rootmenu))) {
-		item = firstChild();
+		item = (ConfigItem *)topLevelItem(0);
 		if (!item)
 			item = new ConfigItem(this, 0, true);
 		last = item;
@@ -470,12 +452,14 @@  void ConfigList::updateList(ConfigItem* item)
 			item->testUpdateMenu(true);
 
 		updateMenuList(item, rootEntry);
-		triggerUpdate();
+		update();
+		resizeColumnToContents(0);
 		return;
 	}
 update:
 	updateMenuList(this, rootEntry);
-	triggerUpdate();
+	update();
+	resizeColumnToContents(0);
 }
 
 void ConfigList::setValue(ConfigItem* item, tristate val)
@@ -497,7 +481,7 @@  void ConfigList::setValue(ConfigItem* item, tristate val)
 		if (!sym_set_tristate_value(sym, val))
 			return;
 		if (oldval == no && item->menu->list)
-			item->setOpen(TRUE);
+			item->setExpanded(true);
 		parent()->updateList(item);
 		break;
 	}
@@ -515,7 +499,7 @@  void ConfigList::changeValue(ConfigItem* item)
 	sym = menu->sym;
 	if (!sym) {
 		if (item->menu->list)
-			item->setOpen(!item->isOpen());
+			item->setExpanded(!item->isExpanded());
 		return;
 	}
 
@@ -527,9 +511,9 @@  void ConfigList::changeValue(ConfigItem* item)
 		newexpr = sym_toggle_tristate_value(sym);
 		if (item->menu->list) {
 			if (oldexpr == newexpr)
-				item->setOpen(!item->isOpen());
+				item->setExpanded(!item->isExpanded());
 			else if (oldexpr == no)
-				item->setOpen(TRUE);
+				item->setExpanded(true);
 		}
 		if (oldexpr != newexpr)
 			parent()->updateList(item);
@@ -537,10 +521,7 @@  void ConfigList::changeValue(ConfigItem* item)
 	case S_INT:
 	case S_HEX:
 	case S_STRING:
-		if (colMap[dataColIdx] >= 0)
-			item->startRename(colMap[dataColIdx]);
-		else
-			parent()->lineEdit->show(item);
+		parent()->lineEdit->show(item);
 		break;
 	}
 }
@@ -557,8 +538,10 @@  void ConfigList::setRootMenu(struct menu *menu)
 	updateMenuList(this, 0);
 	rootEntry = menu;
 	updateListAll();
-	setSelected(currentItem(), hasFocus());
-	ensureItemVisible(currentItem());
+	if (currentItem()) {
+		currentItem()->setSelected(hasFocus());
+		scrollToItem(currentItem());
+	}
 }
 
 void ConfigList::setParentMenu(void)
@@ -571,13 +554,16 @@  void ConfigList::setParentMenu(void)
 		return;
 	setRootMenu(menu_get_parent_menu(rootEntry->parent));
 
-	Q3ListViewItemIterator it(this);
-	for (; (item = (ConfigItem*)it.current()); it++) {
+	QTreeWidgetItemIterator it(this);
+	while (*it) {
+		item = (ConfigItem *)(*it);
 		if (item->menu == oldroot) {
 			setCurrentItem(item);
-			ensureItemVisible(item);
+			scrollToItem(item);
 			break;
 		}
+
+		++it;
 	}
 }
 
@@ -588,8 +574,7 @@  void ConfigList::setParentMenu(void)
  * parent: either the menu list widget or a menu entry widget
  * menu: entry to be updated
  */
-template <class P>
-void ConfigList::updateMenuList(P* parent, struct menu* menu)
+void ConfigList::updateMenuList(ConfigItem *parent, struct menu* menu)
 {
 	struct menu* child;
 	ConfigItem* item;
@@ -598,8 +583,11 @@  void ConfigList::updateMenuList(P* parent, struct menu* menu)
 	enum prop_type type;
 
 	if (!menu) {
-		while ((item = parent->firstChild()))
-			delete item;
+		while (parent->childCount() > 0)
+		{
+			delete parent->takeChild(0);
+		}
+
 		return;
 	}
 
@@ -651,9 +639,74 @@  void ConfigList::updateMenuList(P* parent, struct menu* menu)
 	}
 }
 
+void ConfigList::updateMenuList(ConfigList *parent, struct menu* menu)
+{
+	struct menu* child;
+	ConfigItem* item;
+	ConfigItem* last;
+	bool visible;
+	enum prop_type type;
+
+	if (!menu) {
+		while (parent->topLevelItemCount() > 0)
+		{
+			delete parent->takeTopLevelItem(0);
+		}
+
+		return;
+	}
+
+	last = (ConfigItem*)parent->topLevelItem(0);
+	if (last && !last->goParent)
+		last = 0;
+	for (child = menu->list; child; child = child->next) {
+		item = last ? last->nextSibling() : (ConfigItem*)parent->topLevelItem(0);
+		type = child->prompt ? child->prompt->type : P_UNKNOWN;
+
+		switch (mode) {
+		case menuMode:
+			if (!(child->flags & MENU_ROOT))
+				goto hide;
+			break;
+		case symbolMode:
+			if (child->flags & MENU_ROOT)
+				goto hide;
+			break;
+		default:
+			break;
+		}
+
+		visible = menu_is_visible(child);
+		if (!menuSkip(child)) {
+			if (!child->sym && !child->list && !child->prompt)
+				continue;
+			if (!item || item->menu != child)
+				item = new ConfigItem(parent, last, child, visible);
+			else
+				item->testUpdateMenu(visible);
+
+			if (mode == fullMode || mode == menuMode || type != P_MENU)
+				updateMenuList(item, child);
+			else
+				updateMenuList(item, 0);
+			last = item;
+			continue;
+		}
+	hide:
+		if (item && item->menu == child) {
+			last = (ConfigItem*)parent->topLevelItem(0);
+			if (last == item)
+				last = 0;
+			else while (last->nextSibling() != item)
+				last = last->nextSibling();
+			delete item;
+		}
+	}
+}
+
 void ConfigList::keyPressEvent(QKeyEvent* ev)
 {
-	Q3ListViewItem* i = currentItem();
+	QTreeWidgetItem* i = currentItem();
 	ConfigItem* item;
 	struct menu *menu;
 	enum prop_type type;
@@ -705,20 +758,20 @@  void ConfigList::keyPressEvent(QKeyEvent* ev)
 	ev->accept();
 }
 
-void ConfigList::contentsMousePressEvent(QMouseEvent* e)
+void ConfigList::mousePressEvent(QMouseEvent* e)
 {
 	//QPoint p(contentsToViewport(e->pos()));
 	//printf("contentsMousePressEvent: %d,%d\n", p.x(), p.y());
-	Parent::contentsMousePressEvent(e);
+	Parent::mousePressEvent(e);
 }
 
-void ConfigList::contentsMouseReleaseEvent(QMouseEvent* e)
+void ConfigList::mouseReleaseEvent(QMouseEvent* e)
 {
-	QPoint p(contentsToViewport(e->pos()));
+	QPoint p = e->pos();
 	ConfigItem* item = (ConfigItem*)itemAt(p);
 	struct menu *menu;
 	enum prop_type ptype;
-	const QPixmap* pm;
+	QIcon icon;
 	int idx, x;
 
 	if (!item)
@@ -726,14 +779,13 @@  void ConfigList::contentsMouseReleaseEvent(QMouseEvent* e)
 
 	menu = item->menu;
 	x = header()->offset() + p.x();
-	idx = colRevMap[header()->sectionAt(x)];
+	idx = header()->logicalIndexAt(x);
 	switch (idx) {
 	case promptColIdx:
-		pm = item->pixmap(promptColIdx);
-		if (pm) {
-			int off = header()->sectionPos(0) + itemMargin() +
-				treeStepSize() * (item->depth() + (rootIsDecorated() ? 1 : 0));
-			if (x >= off && x < off + pm->width()) {
+		icon = item->pixmap(promptColIdx);
+		if (!icon.isNull()) {
+			int off = header()->sectionPosition(0) + visualRect(indexAt(p)).x() + 4; // 4 is Hardcoded image offset. There might be a way to do it properly.
+			if (x >= off && x < off + icon.availableSizes().first().width()) {
 				if (item->goParent) {
 					emit parentSelected();
 					break;
@@ -764,19 +816,19 @@  void ConfigList::contentsMouseReleaseEvent(QMouseEvent* e)
 
 skip:
 	//printf("contentsMouseReleaseEvent: %d,%d\n", p.x(), p.y());
-	Parent::contentsMouseReleaseEvent(e);
+	Parent::mouseReleaseEvent(e);
 }
 
-void ConfigList::contentsMouseMoveEvent(QMouseEvent* e)
+void ConfigList::mouseMoveEvent(QMouseEvent* e)
 {
 	//QPoint p(contentsToViewport(e->pos()));
 	//printf("contentsMouseMoveEvent: %d,%d\n", p.x(), p.y());
-	Parent::contentsMouseMoveEvent(e);
+	Parent::mouseMoveEvent(e);
 }
 
-void ConfigList::contentsMouseDoubleClickEvent(QMouseEvent* e)
+void ConfigList::mouseDoubleClickEvent(QMouseEvent* e)
 {
-	QPoint p(contentsToViewport(e->pos()));
+	QPoint p = e->pos(); // TODO: Check if this works(was contentsToViewport).
 	ConfigItem* item = (ConfigItem*)itemAt(p);
 	struct menu *menu;
 	enum prop_type ptype;
@@ -798,7 +850,7 @@  void ConfigList::contentsMouseDoubleClickEvent(QMouseEvent* e)
 
 skip:
 	//printf("contentsMouseDoubleClickEvent: %d,%d\n", p.x(), p.y());
-	Parent::contentsMouseDoubleClickEvent(e);
+	Parent::mouseDoubleClickEvent(e);
 }
 
 void ConfigList::focusInEvent(QFocusEvent *e)
@@ -809,7 +861,7 @@  void ConfigList::focusInEvent(QFocusEvent *e)
 
 	ConfigItem* item = (ConfigItem *)currentItem();
 	if (item) {
-		setSelected(item, TRUE);
+		item->setSelected(true);
 		menu = item->menu;
 	}
 	emit gotFocus(menu);
@@ -819,33 +871,33 @@  void ConfigList::contextMenuEvent(QContextMenuEvent *e)
 {
 	if (e->y() <= header()->geometry().bottom()) {
 		if (!headerPopup) {
-			Q3Action *action;
+			QAction *action;
 
-			headerPopup = new Q3PopupMenu(this);
-			action = new Q3Action(NULL, "Show Name", 0, this);
-			  action->setToggleAction(TRUE);
+			headerPopup = new QMenu(this);
+			action = new QAction("Show Name", this);
+			  action->setCheckable(true);
 			  connect(action, SIGNAL(toggled(bool)),
 				  parent(), SLOT(setShowName(bool)));
 			  connect(parent(), SIGNAL(showNameChanged(bool)),
 				  action, SLOT(setOn(bool)));
-			  action->setOn(showName);
-			  action->addTo(headerPopup);
-			action = new Q3Action(NULL, "Show Range", 0, this);
-			  action->setToggleAction(TRUE);
+			  action->setChecked(showName);
+			  headerPopup->addAction(action);
+			action = new QAction("Show Range", this);
+			  action->setCheckable(true);
 			  connect(action, SIGNAL(toggled(bool)),
 				  parent(), SLOT(setShowRange(bool)));
 			  connect(parent(), SIGNAL(showRangeChanged(bool)),
 				  action, SLOT(setOn(bool)));
-			  action->setOn(showRange);
-			  action->addTo(headerPopup);
-			action = new Q3Action(NULL, "Show Data", 0, this);
-			  action->setToggleAction(TRUE);
+			  action->setChecked(showRange);
+			  headerPopup->addAction(action);
+			action = new QAction("Show Data", this);
+			  action->setCheckable(true);
 			  connect(action, SIGNAL(toggled(bool)),
 				  parent(), SLOT(setShowData(bool)));
 			  connect(parent(), SIGNAL(showDataChanged(bool)),
 				  action, SLOT(setOn(bool)));
-			  action->setOn(showData);
-			  action->addTo(headerPopup);
+			  action->setChecked(showData);
+			  headerPopup->addAction(action);
 		}
 		headerPopup->exec(e->globalPos());
 		e->accept();
@@ -859,11 +911,17 @@  QAction *ConfigView::showAllAction;
 QAction *ConfigView::showPromptAction;
 
 ConfigView::ConfigView(QWidget* parent, const char *name)
-	: Parent(parent, name)
+	: Parent(parent)
 {
-	list = new ConfigList(this, name);
+	setObjectName(name);
+	QVBoxLayout *verticalLayout = new QVBoxLayout(this);
+	verticalLayout->setContentsMargins(0, 0, 0, 0);
+
+	list = new ConfigList(this);
+	verticalLayout->addWidget(list);
 	lineEdit = new ConfigLineEdit(this);
 	lineEdit->hide();
+	verticalLayout->addWidget(lineEdit);
 
 	this->nextView = viewList;
 	viewList = this;
@@ -922,10 +980,13 @@  void ConfigView::setShowData(bool b)
 
 void ConfigList::setAllOpen(bool open)
 {
-	Q3ListViewItemIterator it(this);
+	QTreeWidgetItemIterator it(this);
 
-	for (; it.current(); it++)
-		it.current()->setOpen(open);
+	while (*it) {
+		(*it)->setExpanded(open);
+
+		++it;
+	}
 }
 
 void ConfigView::updateList(ConfigItem* item)
@@ -945,11 +1006,14 @@  void ConfigView::updateListAll(void)
 }
 
 ConfigInfoView::ConfigInfoView(QWidget* parent, const char *name)
-	: Parent(parent, name), sym(0), _menu(0)
+	: Parent(parent), sym(0), _menu(0)
 {
-	if (name) {
-		configSettings->beginGroup(name);
-		_showDebug = configSettings->readBoolEntry("/showDebug", false);
+	setObjectName(name);
+
+
+	if (!objectName().isEmpty()) {
+		configSettings->beginGroup(objectName());
+		setShowDebug(configSettings->value("/showDebug", false).toBool());
 		configSettings->endGroup();
 		connect(configApp, SIGNAL(aboutToQuit()), SLOT(saveSettings()));
 	}
@@ -957,9 +1021,9 @@  ConfigInfoView::ConfigInfoView(QWidget* parent, const char *name)
 
 void ConfigInfoView::saveSettings(void)
 {
-	if (name()) {
-		configSettings->beginGroup(name());
-		configSettings->writeEntry("/showDebug", showDebug());
+	if (!objectName().isEmpty()) {
+		configSettings->beginGroup(objectName());
+		configSettings->setValue("/showDebug", showDebug());
 		configSettings->endGroup();
 	}
 }
@@ -1085,7 +1149,6 @@  QString ConfigInfoView::debug_info(struct symbol *sym)
 		case P_DEFAULT:
 		case P_SELECT:
 		case P_RANGE:
-		case P_ENV:
 			debug += prop_get_type_name(prop->type);
 			debug += ": ";
 			expr_print(prop->expr, expr_print_help, &debug, E_NONE);
@@ -1118,8 +1181,8 @@  QString ConfigInfoView::print_filter(const QString &str)
 {
 	QRegExp re("[<>&\"\\n]");
 	QString res = str;
-	for (int i = 0; (i = res.find(re, i)) >= 0;) {
-		switch (res[i].latin1()) {
+	for (int i = 0; (i = res.indexOf(re, i)) >= 0;) {
+		switch (res[i].toLatin1()) {
 		case '<':
 			res.replace(i, 1, "&lt;");
 			i += 4;
@@ -1158,37 +1221,42 @@  void ConfigInfoView::expr_print_help(void *data, struct symbol *sym, const char
 		*text += str2;
 }
 
-Q3PopupMenu* ConfigInfoView::createPopupMenu(const QPoint& pos)
+QMenu* ConfigInfoView::createStandardContextMenu(const QPoint & pos)
 {
-	Q3PopupMenu* popup = Parent::createPopupMenu(pos);
-	Q3Action* action = new Q3Action(NULL, "Show Debug Info", 0, popup);
-	  action->setToggleAction(TRUE);
+	QMenu* popup = Parent::createStandardContextMenu(pos);
+	QAction* action = new QAction("Show Debug Info", popup);
+	  action->setCheckable(true);
 	  connect(action, SIGNAL(toggled(bool)), SLOT(setShowDebug(bool)));
 	  connect(this, SIGNAL(showDebugChanged(bool)), action, SLOT(setOn(bool)));
-	  action->setOn(showDebug());
-	popup->insertSeparator();
-	action->addTo(popup);
+	  action->setChecked(showDebug());
+	popup->addSeparator();
+	popup->addAction(action);
 	return popup;
 }
 
-void ConfigInfoView::contentsContextMenuEvent(QContextMenuEvent *e)
+void ConfigInfoView::contextMenuEvent(QContextMenuEvent *e)
 {
-	Parent::contentsContextMenuEvent(e);
+	Parent::contextMenuEvent(e);
 }
 
 ConfigSearchWindow::ConfigSearchWindow(ConfigMainWindow* parent, const char *name)
-	: Parent(parent, name), result(NULL)
+	: Parent(parent), result(NULL)
 {
-	setCaption("Search Config");
+	setObjectName(name);
+	setWindowTitle("Search Config");
 
-	QVBoxLayout* layout1 = new QVBoxLayout(this, 11, 6);
-	QHBoxLayout* layout2 = new QHBoxLayout(0, 0, 6);
+	QVBoxLayout* layout1 = new QVBoxLayout(this);
+	layout1->setContentsMargins(11, 11, 11, 11);
+	layout1->setSpacing(6);
+	QHBoxLayout* layout2 = new QHBoxLayout(0);
+	layout2->setContentsMargins(0, 0, 0, 0);
+	layout2->setSpacing(6);
 	layout2->addWidget(new QLabel("Find:", this));
 	editField = new QLineEdit(this);
 	connect(editField, SIGNAL(returnPressed()), SLOT(search()));
 	layout2->addWidget(editField);
 	searchButton = new QPushButton("Search", this);
-	searchButton->setAutoDefault(FALSE);
+	searchButton->setAutoDefault(false);
 	connect(searchButton, SIGNAL(clicked()), SLOT(search()));
 	layout2->addWidget(searchButton);
 	layout1->addLayout(layout2);
@@ -1206,19 +1274,19 @@  ConfigSearchWindow::ConfigSearchWindow(ConfigMainWindow* parent, const char *nam
 	layout1->addWidget(split);
 
 	if (name) {
-		int x, y, width, height;
+		QVariant x, y;
+		int width, height;
 		bool ok;
 
 		configSettings->beginGroup(name);
-		width = configSettings->readNumEntry("/window width", parent->width() / 2);
-		height = configSettings->readNumEntry("/window height", parent->height() / 2);
+		width = configSettings->value("/window width", parent->width() / 2).toInt();
+		height = configSettings->value("/window height", parent->height() / 2).toInt();
 		resize(width, height);
-		x = configSettings->readNumEntry("/window x", 0, &ok);
-		if (ok)
-			y = configSettings->readNumEntry("/window y", 0, &ok);
-		if (ok)
-			move(x, y);
-		Q3ValueList<int> sizes = configSettings->readSizes("/split", &ok);
+		x = configSettings->value("/window x");
+		y = configSettings->value("/window y");
+		if ((x.isValid())&&(y.isValid()))
+			move(x.toInt(), y.toInt());
+		QList<int> sizes = configSettings->readSizes("/split", &ok);
 		if (ok)
 			split->setSizes(sizes);
 		configSettings->endGroup();
@@ -1228,12 +1296,12 @@  ConfigSearchWindow::ConfigSearchWindow(ConfigMainWindow* parent, const char *nam
 
 void ConfigSearchWindow::saveSettings(void)
 {
-	if (name()) {
-		configSettings->beginGroup(name());
-		configSettings->writeEntry("/window x", pos().x());
-		configSettings->writeEntry("/window y", pos().y());
-		configSettings->writeEntry("/window width", size().width());
-		configSettings->writeEntry("/window height", size().height());
+	if (!objectName().isEmpty()) {
+		configSettings->beginGroup(objectName());
+		configSettings->setValue("/window x", pos().x());
+		configSettings->setValue("/window y", pos().y());
+		configSettings->setValue("/window width", size().width());
+		configSettings->setValue("/window height", size().height());
 		configSettings->writeSizes("/split", split->sizes());
 		configSettings->endGroup();
 	}
@@ -1249,7 +1317,7 @@  void ConfigSearchWindow::search(void)
 	list->list->clear();
 	info->clear();
 
-	result = sym_re_search(editField->text().latin1());
+	result = sym_re_search(editField->text().toLatin1());
 	if (!result)
 		return;
 	for (p = result; *p; p++) {
@@ -1266,29 +1334,25 @@  ConfigMainWindow::ConfigMainWindow(void)
 	: searchWindow(0)
 {
 	QMenuBar* menu;
-	bool ok;
-	int x, y, width, height;
+	bool ok = true;
+	QVariant x, y;
+	int width, height;
 	char title[256];
 
 	QDesktopWidget *d = configApp->desktop();
 	snprintf(title, sizeof(title), "%s%s",
 		rootmenu.prompt->text,
-#if QT_VERSION < 0x040000
-		" (Qt3)"
-#else
 		""
-#endif
 		);
-	setCaption(title);
+	setWindowTitle(title);
 
-	width = configSettings->readNumEntry("/window width", d->width() - 64);
-	height = configSettings->readNumEntry("/window height", d->height() - 64);
+	width = configSettings->value("/window width", d->width() - 64).toInt();
+	height = configSettings->value("/window height", d->height() - 64).toInt();
 	resize(width, height);
-	x = configSettings->readNumEntry("/window x", 0, &ok);
-	if (ok)
-		y = configSettings->readNumEntry("/window y", 0, &ok);
-	if (ok)
-		move(x, y);
+	x = configSettings->value("/window x");
+	y = configSettings->value("/window y");
+	if ((x.isValid())&&(y.isValid()))
+		move(x.toInt(), y.toInt());
 
 	split1 = new QSplitter(this);
 	split1->setOrientation(Qt::Horizontal);
@@ -1305,127 +1369,118 @@  ConfigMainWindow::ConfigMainWindow(void)
 	configList = configView->list;
 
 	helpText = new ConfigInfoView(split2, "help");
-	helpText->setTextFormat(Qt::RichText);
 
 	setTabOrder(configList, helpText);
 	configList->setFocus();
 
 	menu = menuBar();
-	toolBar = new Q3ToolBar("Tools", this);
-
-	backAction = new Q3Action("Back", QPixmap(xpm_back), "Back", 0, this);
-	  connect(backAction, SIGNAL(activated()), SLOT(goBack()));
-	  backAction->setEnabled(FALSE);
-	Q3Action *quitAction = new Q3Action("Quit", "&Quit", Qt::CTRL + Qt::Key_Q, this);
-	  connect(quitAction, SIGNAL(activated()), SLOT(close()));
-	Q3Action *loadAction = new Q3Action("Load", QPixmap(xpm_load), "&Load", Qt::CTRL + Qt::Key_L, this);
-	  connect(loadAction, SIGNAL(activated()), SLOT(loadConfig()));
-	saveAction = new Q3Action("Save", QPixmap(xpm_save), "&Save", Qt::CTRL + Qt::Key_S, this);
-	  connect(saveAction, SIGNAL(activated()), SLOT(saveConfig()));
+	toolBar = new QToolBar("Tools", this);
+	addToolBar(toolBar);
+
+	backAction = new QAction(QPixmap(xpm_back), "Back", this);
+	  connect(backAction, SIGNAL(triggered(bool)), SLOT(goBack()));
+	  backAction->setEnabled(false);
+	QAction *quitAction = new QAction("&Quit", this);
+	quitAction->setShortcut(Qt::CTRL + Qt::Key_Q);
+	  connect(quitAction, SIGNAL(triggered(bool)), SLOT(close()));
+	QAction *loadAction = new QAction(QPixmap(xpm_load), "&Load", this);
+	loadAction->setShortcut(Qt::CTRL + Qt::Key_L);
+	  connect(loadAction, SIGNAL(triggered(bool)), SLOT(loadConfig()));
+	saveAction = new QAction(QPixmap(xpm_save), "&Save", this);
+	saveAction->setShortcut(Qt::CTRL + Qt::Key_S);
+	  connect(saveAction, SIGNAL(triggered(bool)), SLOT(saveConfig()));
 	conf_set_changed_callback(conf_changed);
 	// Set saveAction's initial state
 	conf_changed();
-	Q3Action *saveAsAction = new Q3Action("Save As...", "Save &As...", 0, this);
-	  connect(saveAsAction, SIGNAL(activated()), SLOT(saveConfigAs()));
-	Q3Action *searchAction = new Q3Action("Find", "&Find", Qt::CTRL + Qt::Key_F, this);
-	  connect(searchAction, SIGNAL(activated()), SLOT(searchConfig()));
-	Q3Action *singleViewAction = new Q3Action("Single View", QPixmap(xpm_single_view), "Single View", 0, this);
-	  connect(singleViewAction, SIGNAL(activated()), SLOT(showSingleView()));
-	Q3Action *splitViewAction = new Q3Action("Split View", QPixmap(xpm_split_view), "Split View", 0, this);
-	  connect(splitViewAction, SIGNAL(activated()), SLOT(showSplitView()));
-	Q3Action *fullViewAction = new Q3Action("Full View", QPixmap(xpm_tree_view), "Full View", 0, this);
-	  connect(fullViewAction, SIGNAL(activated()), SLOT(showFullView()));
-
-	Q3Action *showNameAction = new Q3Action(NULL, "Show Name", 0, this);
-	  showNameAction->setToggleAction(TRUE);
+	configname = xstrdup(conf_get_configname());
+
+	QAction *saveAsAction = new QAction("Save &As...", this);
+	  connect(saveAsAction, SIGNAL(triggered(bool)), SLOT(saveConfigAs()));
+	QAction *searchAction = new QAction("&Find", this);
+	searchAction->setShortcut(Qt::CTRL + Qt::Key_F);
+	  connect(searchAction, SIGNAL(triggered(bool)), SLOT(searchConfig()));
+	singleViewAction = new QAction(QPixmap(xpm_single_view), "Single View", this);
+	singleViewAction->setCheckable(true);
+	  connect(singleViewAction, SIGNAL(triggered(bool)), SLOT(showSingleView()));
+	splitViewAction = new QAction(QPixmap(xpm_split_view), "Split View", this);
+	splitViewAction->setCheckable(true);
+	  connect(splitViewAction, SIGNAL(triggered(bool)), SLOT(showSplitView()));
+	fullViewAction = new QAction(QPixmap(xpm_tree_view), "Full View", this);
+	fullViewAction->setCheckable(true);
+	  connect(fullViewAction, SIGNAL(triggered(bool)), SLOT(showFullView()));
+
+	QAction *showNameAction = new QAction("Show Name", this);
+	  showNameAction->setCheckable(true);
 	  connect(showNameAction, SIGNAL(toggled(bool)), configView, SLOT(setShowName(bool)));
-	  connect(configView, SIGNAL(showNameChanged(bool)), showNameAction, SLOT(setOn(bool)));
-	  showNameAction->setOn(configView->showName());
-	Q3Action *showRangeAction = new Q3Action(NULL, "Show Range", 0, this);
-	  showRangeAction->setToggleAction(TRUE);
+	  showNameAction->setChecked(configView->showName());
+	QAction *showRangeAction = new QAction("Show Range", this);
+	  showRangeAction->setCheckable(true);
 	  connect(showRangeAction, SIGNAL(toggled(bool)), configView, SLOT(setShowRange(bool)));
-	  connect(configView, SIGNAL(showRangeChanged(bool)), showRangeAction, SLOT(setOn(bool)));
-	  showRangeAction->setOn(configList->showRange);
-	Q3Action *showDataAction = new Q3Action(NULL, "Show Data", 0, this);
-	  showDataAction->setToggleAction(TRUE);
+	QAction *showDataAction = new QAction("Show Data", this);
+	  showDataAction->setCheckable(true);
 	  connect(showDataAction, SIGNAL(toggled(bool)), configView, SLOT(setShowData(bool)));
-	  connect(configView, SIGNAL(showDataChanged(bool)), showDataAction, SLOT(setOn(bool)));
-	  showDataAction->setOn(configList->showData);
 
 	QActionGroup *optGroup = new QActionGroup(this);
-	optGroup->setExclusive(TRUE);
-	connect(optGroup, SIGNAL(selected(QAction *)), configView,
+	optGroup->setExclusive(true);
+	connect(optGroup, SIGNAL(triggered(QAction*)), configView,
 		SLOT(setOptionMode(QAction *)));
-	connect(optGroup, SIGNAL(selected(QAction *)), menuView,
+	connect(optGroup, SIGNAL(triggered(QAction *)), menuView,
 		SLOT(setOptionMode(QAction *)));
 
-#if QT_VERSION >= 0x040000
 	configView->showNormalAction = new QAction("Show Normal Options", optGroup);
 	configView->showAllAction = new QAction("Show All Options", optGroup);
 	configView->showPromptAction = new QAction("Show Prompt Options", optGroup);
-#else
-	configView->showNormalAction = new QAction("Show Normal Options", 0, optGroup);
-	configView->showAllAction = new QAction("Show All Options", 0, optGroup);
-	configView->showPromptAction = new QAction("Show Prompt Options", 0, optGroup);
-#endif
-	configView->showNormalAction->setToggleAction(TRUE);
-	configView->showNormalAction->setOn(configList->optMode == normalOpt);
-	configView->showAllAction->setToggleAction(TRUE);
-	configView->showAllAction->setOn(configList->optMode == allOpt);
-	configView->showPromptAction->setToggleAction(TRUE);
-	configView->showPromptAction->setOn(configList->optMode == promptOpt);
-
-	Q3Action *showDebugAction = new Q3Action(NULL, "Show Debug Info", 0, this);
-	  showDebugAction->setToggleAction(TRUE);
+	configView->showNormalAction->setCheckable(true);
+	configView->showAllAction->setCheckable(true);
+	configView->showPromptAction->setCheckable(true);
+
+	QAction *showDebugAction = new QAction("Show Debug Info", this);
+	  showDebugAction->setCheckable(true);
 	  connect(showDebugAction, SIGNAL(toggled(bool)), helpText, SLOT(setShowDebug(bool)));
-	  connect(helpText, SIGNAL(showDebugChanged(bool)), showDebugAction, SLOT(setOn(bool)));
-	  showDebugAction->setOn(helpText->showDebug());
+	  showDebugAction->setChecked(helpText->showDebug());
 
-	Q3Action *showIntroAction = new Q3Action(NULL, "Introduction", 0, this);
-	  connect(showIntroAction, SIGNAL(activated()), SLOT(showIntro()));
-	Q3Action *showAboutAction = new Q3Action(NULL, "About", 0, this);
-	  connect(showAboutAction, SIGNAL(activated()), SLOT(showAbout()));
+	QAction *showIntroAction = new QAction("Introduction", this);
+	  connect(showIntroAction, SIGNAL(triggered(bool)), SLOT(showIntro()));
+	QAction *showAboutAction = new QAction("About", this);
+	  connect(showAboutAction, SIGNAL(triggered(bool)), SLOT(showAbout()));
 
 	// init tool bar
-	backAction->addTo(toolBar);
+	toolBar->addAction(backAction);
 	toolBar->addSeparator();
-	loadAction->addTo(toolBar);
-	saveAction->addTo(toolBar);
+	toolBar->addAction(loadAction);
+	toolBar->addAction(saveAction);
 	toolBar->addSeparator();
-	singleViewAction->addTo(toolBar);
-	splitViewAction->addTo(toolBar);
-	fullViewAction->addTo(toolBar);
+	toolBar->addAction(singleViewAction);
+	toolBar->addAction(splitViewAction);
+	toolBar->addAction(fullViewAction);
 
 	// create config menu
-	Q3PopupMenu* config = new Q3PopupMenu(this);
-	menu->insertItem("&File", config);
-	loadAction->addTo(config);
-	saveAction->addTo(config);
-	saveAsAction->addTo(config);
-	config->insertSeparator();
-	quitAction->addTo(config);
+	QMenu* config = menu->addMenu("&File");
+	config->addAction(loadAction);
+	config->addAction(saveAction);
+	config->addAction(saveAsAction);
+	config->addSeparator();
+	config->addAction(quitAction);
 
 	// create edit menu
-	Q3PopupMenu* editMenu = new Q3PopupMenu(this);
-	menu->insertItem("&Edit", editMenu);
-	searchAction->addTo(editMenu);
+	QMenu* editMenu = menu->addMenu("&Edit");
+	editMenu->addAction(searchAction);
 
 	// create options menu
-	Q3PopupMenu* optionMenu = new Q3PopupMenu(this);
-	menu->insertItem("&Option", optionMenu);
-	showNameAction->addTo(optionMenu);
-	showRangeAction->addTo(optionMenu);
-	showDataAction->addTo(optionMenu);
-	optionMenu->insertSeparator();
-	optGroup->addTo(optionMenu);
-	optionMenu->insertSeparator();
+	QMenu* optionMenu = menu->addMenu("&Option");
+	optionMenu->addAction(showNameAction);
+	optionMenu->addAction(showRangeAction);
+	optionMenu->addAction(showDataAction);
+	optionMenu->addSeparator();
+	optionMenu->addActions(optGroup->actions());
+	optionMenu->addSeparator();
+	optionMenu->addAction(showDebugAction);
 
 	// create help menu
-	Q3PopupMenu* helpMenu = new Q3PopupMenu(this);
-	menu->insertSeparator();
-	menu->insertItem("&Help", helpMenu);
-	showIntroAction->addTo(helpMenu);
-	showAboutAction->addTo(helpMenu);
+	menu->addSeparator();
+	QMenu* helpMenu = menu->addMenu("&Help");
+	helpMenu->addAction(showIntroAction);
+	helpMenu->addAction(showAboutAction);
 
 	connect(configList, SIGNAL(menuChanged(struct menu *)),
 		helpText, SLOT(setInfo(struct menu *)));
@@ -1447,7 +1502,7 @@  ConfigMainWindow::ConfigMainWindow(void)
 	connect(helpText, SIGNAL(menuSelected(struct menu *)),
 		SLOT(setMenuLink(struct menu *)));
 
-	QString listMode = configSettings->readEntry("/listMode", "symbol");
+	QString listMode = configSettings->value("/listMode", "symbol").toString();
 	if (listMode == "single")
 		showSingleView();
 	else if (listMode == "full")
@@ -1456,7 +1511,7 @@  ConfigMainWindow::ConfigMainWindow(void)
 		showSplitView();
 
 	// UI setup done, restore splitter positions
-	Q3ValueList<int> sizes = configSettings->readSizes("/split1", &ok);
+	QList<int> sizes = configSettings->readSizes("/split1", &ok);
 	if (ok)
 		split1->setSizes(sizes);
 
@@ -1467,29 +1522,57 @@  ConfigMainWindow::ConfigMainWindow(void)
 
 void ConfigMainWindow::loadConfig(void)
 {
-	QString s = Q3FileDialog::getOpenFileName(conf_get_configname(), NULL, this);
-	if (s.isNull())
+	QString str;
+	QByteArray ba;
+	const char *name;
+
+	str = QFileDialog::getOpenFileName(this, "", configname);
+	if (str.isNull())
 		return;
-	if (conf_read(QFile::encodeName(s)))
+
+	ba = str.toLocal8Bit();
+	name = ba.data();
+
+	if (conf_read(name))
 		QMessageBox::information(this, "qconf", "Unable to load configuration!");
+
+	free(configname);
+	configname = xstrdup(name);
+
 	ConfigView::updateListAll();
 }
 
 bool ConfigMainWindow::saveConfig(void)
 {
-	if (conf_write(NULL)) {
+	if (conf_write(configname)) {
 		QMessageBox::information(this, "qconf", "Unable to save configuration!");
 		return false;
 	}
+	conf_write_autoconf(0);
+
 	return true;
 }
 
 void ConfigMainWindow::saveConfigAs(void)
 {
-	QString s = Q3FileDialog::getSaveFileName(conf_get_configname(), NULL, this);
-	if (s.isNull())
+	QString str;
+	QByteArray ba;
+	const char *name;
+
+	str = QFileDialog::getSaveFileName(this, "", configname);
+	if (str.isNull())
 		return;
-	saveConfig();
+
+	ba = str.toLocal8Bit();
+	name = ba.data();
+
+	if (conf_write(name)) {
+		QMessageBox::information(this, "qconf", "Unable to save configuration!");
+	}
+	conf_write_autoconf(0);
+
+	free(configname);
+	configname = xstrdup(name);
 }
 
 void ConfigMainWindow::searchConfig(void)
@@ -1503,9 +1586,9 @@  void ConfigMainWindow::changeMenu(struct menu *menu)
 {
 	configList->setRootMenu(menu);
 	if (configList->rootEntry->parent == &rootmenu)
-		backAction->setEnabled(FALSE);
+		backAction->setEnabled(false);
 	else
-		backAction->setEnabled(TRUE);
+		backAction->setEnabled(true);
 }
 
 void ConfigMainWindow::setMenuLink(struct menu *menu)
@@ -1537,8 +1620,8 @@  void ConfigMainWindow::setMenuLink(struct menu *menu)
 				return;
 			item = menuList->findConfigItem(parent);
 			if (item) {
-				menuList->setSelected(item, TRUE);
-				menuList->ensureItemVisible(item);
+				item->setSelected(true);
+				menuList->scrollToItem(item);
 			}
 			list->setRootMenu(parent);
 		}
@@ -1553,8 +1636,8 @@  void ConfigMainWindow::setMenuLink(struct menu *menu)
 	if (list) {
 		item = list->findConfigItem(menu);
 		if (item) {
-			list->setSelected(item, TRUE);
-			list->ensureItemVisible(item);
+			item->setSelected(true);
+			list->scrollToItem(item);
 			list->setFocus();
 		}
 	}
@@ -1568,15 +1651,21 @@  void ConfigMainWindow::listFocusChanged(void)
 
 void ConfigMainWindow::goBack(void)
 {
-	ConfigItem* item;
+	ConfigItem* item, *oldSelection;
 
 	configList->setParentMenu();
 	if (configList->rootEntry == &rootmenu)
-		backAction->setEnabled(FALSE);
-	item = (ConfigItem*)menuList->selectedItem();
+		backAction->setEnabled(false);
+
+	if (menuList->selectedItems().count() == 0)
+		return;
+
+	item = (ConfigItem*)menuList->selectedItems().first();
+	oldSelection = item;
 	while (item) {
 		if (item->menu == configList->rootEntry) {
-			menuList->setSelected(item, TRUE);
+			oldSelection->setSelected(false);
+			item->setSelected(true);
 			break;
 		}
 		item = (ConfigItem*)item->parent();
@@ -1585,6 +1674,13 @@  void ConfigMainWindow::goBack(void)
 
 void ConfigMainWindow::showSingleView(void)
 {
+	singleViewAction->setEnabled(false);
+	singleViewAction->setChecked(true);
+	splitViewAction->setEnabled(true);
+	splitViewAction->setChecked(false);
+	fullViewAction->setEnabled(true);
+	fullViewAction->setChecked(false);
+
 	menuView->hide();
 	menuList->setRootMenu(0);
 	configList->mode = singleMode;
@@ -1592,28 +1688,41 @@  void ConfigMainWindow::showSingleView(void)
 		configList->updateListAll();
 	else
 		configList->setRootMenu(&rootmenu);
-	configList->setAllOpen(TRUE);
 	configList->setFocus();
 }
 
 void ConfigMainWindow::showSplitView(void)
 {
+	singleViewAction->setEnabled(true);
+	singleViewAction->setChecked(false);
+	splitViewAction->setEnabled(false);
+	splitViewAction->setChecked(true);
+	fullViewAction->setEnabled(true);
+	fullViewAction->setChecked(false);
+
 	configList->mode = symbolMode;
 	if (configList->rootEntry == &rootmenu)
 		configList->updateListAll();
 	else
 		configList->setRootMenu(&rootmenu);
-	configList->setAllOpen(TRUE);
+	configList->setAllOpen(true);
 	configApp->processEvents();
 	menuList->mode = menuMode;
 	menuList->setRootMenu(&rootmenu);
-	menuList->setAllOpen(TRUE);
+	menuList->setAllOpen(true);
 	menuView->show();
 	menuList->setFocus();
 }
 
 void ConfigMainWindow::showFullView(void)
 {
+	singleViewAction->setEnabled(true);
+	singleViewAction->setChecked(false);
+	splitViewAction->setEnabled(true);
+	splitViewAction->setChecked(false);
+	fullViewAction->setEnabled(false);
+	fullViewAction->setChecked(true);
+
 	menuView->hide();
 	menuList->setRootMenu(0);
 	configList->mode = fullMode;
@@ -1621,7 +1730,6 @@  void ConfigMainWindow::showFullView(void)
 		configList->updateListAll();
 	else
 		configList->setRootMenu(&rootmenu);
-	configList->setAllOpen(FALSE);
 	configList->setFocus();
 }
 
@@ -1668,14 +1776,15 @@  void ConfigMainWindow::showIntro(void)
 		"options must be enabled to support the option you are interested in, you can\n"
 		"still view the help of a grayed-out option.\n\n"
 		"Toggling Show Debug Info under the Options menu will show the dependencies,\n"
-		"which you can then match by examining other options.\n\n");
+		"which you can then match by examining other options.\n\n";
 
 	QMessageBox::information(this, "qconf", str);
 }
 
 void ConfigMainWindow::showAbout(void)
 {
-	static const QString str = "qconf is Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>.\n\n"
+	static const QString str = "qconf is Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>.\n"
+		"Copyright (C) 2015 Boris Barbulovski <bbarbulovski@gmail.com>.\n\n"
 		"Bug reports and feature request can also be entered at http://bugzilla.kernel.org/\n";
 
 	QMessageBox::information(this, "qconf", str);
@@ -1683,10 +1792,10 @@  void ConfigMainWindow::showAbout(void)
 
 void ConfigMainWindow::saveSettings(void)
 {
-	configSettings->writeEntry("/window x", pos().x());
-	configSettings->writeEntry("/window y", pos().y());
-	configSettings->writeEntry("/window width", size().width());
-	configSettings->writeEntry("/window height", size().height());
+	configSettings->setValue("/window x", pos().x());
+	configSettings->setValue("/window y", pos().y());
+	configSettings->setValue("/window width", size().width());
+	configSettings->setValue("/window height", size().height());
 
 	QString entry;
 	switch(configList->mode) {
@@ -1705,7 +1814,7 @@  void ConfigMainWindow::saveSettings(void)
 	default:
 		break;
 	}
-	configSettings->writeEntry("/listMode", entry);
+	configSettings->setValue("/listMode", entry);
 
 	configSettings->writeSizes("/split1", split1->sizes());
 	configSettings->writeSizes("/split2", split2->sizes());
@@ -1773,7 +1882,6 @@  int main(int ac, char** av)
 	v = new ConfigMainWindow();
 
 	//zconfdump(stdout);
-	configApp->setMainWidget(v);
 	configApp->connect(configApp, SIGNAL(lastWindowClosed()), SLOT(quit()));
 	configApp->connect(configApp, SIGNAL(aboutToQuit()), v, SLOT(saveSettings()));
 	v->show();
@@ -1781,6 +1889,8 @@  int main(int ac, char** av)
 
 	configSettings->endGroup();
 	delete configSettings;
+	delete v;
+	delete configApp;
 
 	return 0;
 }
diff --git a/xen/tools/kconfig/qconf.h b/xen/tools/kconfig/qconf.h
index bde0c6b6f9e8..45bfe9b2b966 100644
--- a/xen/tools/kconfig/qconf.h
+++ b/xen/tools/kconfig/qconf.h
@@ -1,28 +1,20 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
-#if QT_VERSION < 0x040000
-#include <qlistview.h>
-#else
-#include <q3listview.h>
-#endif
+#include <QTextBrowser>
+#include <QTreeWidget>
+#include <QMainWindow>
+#include <QHeaderView>
 #include <qsettings.h>
-
-#if QT_VERSION < 0x040000
-#define Q3ValueList             QValueList
-#define Q3PopupMenu             QPopupMenu
-#define Q3ListView              QListView
-#define Q3ListViewItem          QListViewItem
-#define Q3VBox                  QVBox
-#define Q3TextBrowser           QTextBrowser
-#define Q3MainWindow            QMainWindow
-#define Q3Action                QAction
-#define Q3ToolBar               QToolBar
-#define Q3ListViewItemIterator  QListViewItemIterator
-#define Q3FileDialog            QFileDialog
-#endif
+#include <QPushButton>
+#include <QSettings>
+#include <QLineEdit>
+#include <QSplitter>
+#include <QCheckBox>
+#include <QDialog>
+#include "expr.h"
 
 class ConfigView;
 class ConfigList;
@@ -33,8 +25,8 @@  class ConfigMainWindow;
 class ConfigSettings : public QSettings {
 public:
 	ConfigSettings();
-	Q3ValueList<int> readSizes(const QString& key, bool *ok);
-	bool writeSizes(const QString& key, const Q3ValueList<int>& value);
+	QList<int> readSizes(const QString& key, bool *ok);
+	bool writeSizes(const QString& key, const QList<int>& value);
 };
 
 enum colIdx {
@@ -47,9 +39,9 @@  enum optionMode {
 	normalOpt = 0, allOpt, promptOpt
 };
 
-class ConfigList : public Q3ListView {
+class ConfigList : public QTreeWidget {
 	Q_OBJECT
-	typedef class Q3ListView Parent;
+	typedef class QTreeWidget Parent;
 public:
 	ConfigList(ConfigView* p, const char *name = 0);
 	void reinit(void);
@@ -61,10 +53,10 @@  class ConfigList : public Q3ListView {
 
 protected:
 	void keyPressEvent(QKeyEvent *e);
-	void contentsMousePressEvent(QMouseEvent *e);
-	void contentsMouseReleaseEvent(QMouseEvent *e);
-	void contentsMouseMoveEvent(QMouseEvent *e);
-	void contentsMouseDoubleClickEvent(QMouseEvent *e);
+	void mousePressEvent(QMouseEvent *e);
+	void mouseReleaseEvent(QMouseEvent *e);
+	void mouseMoveEvent(QMouseEvent *e);
+	void mouseDoubleClickEvent(QMouseEvent *e);
 	void focusInEvent(QFocusEvent *e);
 	void contextMenuEvent(QContextMenuEvent *e);
 
@@ -95,32 +87,23 @@  public slots:
 	}
 	ConfigItem* firstChild() const
 	{
-		return (ConfigItem *)Parent::firstChild();
-	}
-	int mapIdx(colIdx idx)
-	{
-		return colMap[idx];
+		return (ConfigItem *)children().first();
 	}
-	void addColumn(colIdx idx, const QString& label)
+	void addColumn(colIdx idx)
 	{
-		colMap[idx] = Parent::addColumn(label);
-		colRevMap[colMap[idx]] = idx;
+		showColumn(idx);
 	}
 	void removeColumn(colIdx idx)
 	{
-		int col = colMap[idx];
-		if (col >= 0) {
-			Parent::removeColumn(col);
-			colRevMap[col] = colMap[idx] = -1;
-		}
+		hideColumn(idx);
 	}
 	void setAllOpen(bool open);
 	void setParentMenu(void);
 
 	bool menuSkip(struct menu *);
 
-	template <class P>
-	void updateMenuList(P*, struct menu*);
+	void updateMenuList(ConfigItem *parent, struct menu*);
+	void updateMenuList(ConfigList *parent, struct menu*);
 
 	bool updateAll;
 
@@ -132,30 +115,26 @@  public slots:
 	enum listMode mode;
 	enum optionMode optMode;
 	struct menu *rootEntry;
-	QColorGroup disabledColorGroup;
-	QColorGroup inactivedColorGroup;
-	Q3PopupMenu* headerPopup;
-
-private:
-	int colMap[colNr];
-	int colRevMap[colNr];
+	QPalette disabledColorGroup;
+	QPalette inactivedColorGroup;
+	QMenu* headerPopup;
 };
 
-class ConfigItem : public Q3ListViewItem {
-	typedef class Q3ListViewItem Parent;
+class ConfigItem : public QTreeWidgetItem {
+	typedef class QTreeWidgetItem Parent;
 public:
-	ConfigItem(Q3ListView *parent, ConfigItem *after, struct menu *m, bool v)
-	: Parent(parent, after), menu(m), visible(v), goParent(false)
+	ConfigItem(ConfigList *parent, ConfigItem *after, struct menu *m, bool v)
+	: Parent(parent, after), nextItem(0), menu(m), visible(v), goParent(false)
 	{
 		init();
 	}
 	ConfigItem(ConfigItem *parent, ConfigItem *after, struct menu *m, bool v)
-	: Parent(parent, after), menu(m), visible(v), goParent(false)
+	: Parent(parent, after), nextItem(0), menu(m), visible(v), goParent(false)
 	{
 		init();
 	}
-	ConfigItem(Q3ListView *parent, ConfigItem *after, bool v)
-	: Parent(parent, after), menu(0), visible(v), goParent(true)
+	ConfigItem(ConfigList *parent, ConfigItem *after, bool v)
+	: Parent(parent, after), nextItem(0), menu(0), visible(v), goParent(true)
 	{
 		init();
 	}
@@ -166,33 +145,43 @@  class ConfigItem : public Q3ListViewItem {
 	void testUpdateMenu(bool v);
 	ConfigList* listView() const
 	{
-		return (ConfigList*)Parent::listView();
+		return (ConfigList*)Parent::treeWidget();
 	}
 	ConfigItem* firstChild() const
 	{
-		return (ConfigItem *)Parent::firstChild();
+		return (ConfigItem *)Parent::child(0);
 	}
-	ConfigItem* nextSibling() const
+	ConfigItem* nextSibling()
 	{
-		return (ConfigItem *)Parent::nextSibling();
+		ConfigItem *ret = NULL;
+		ConfigItem *_parent = (ConfigItem *)parent();
+
+		if(_parent) {
+			ret = (ConfigItem *)_parent->child(_parent->indexOfChild(this)+1);
+		} else {
+			QTreeWidget *_treeWidget = treeWidget();
+			ret = (ConfigItem *)_treeWidget->topLevelItem(_treeWidget->indexOfTopLevelItem(this)+1);
+		}
+
+		return ret;
 	}
 	void setText(colIdx idx, const QString& text)
 	{
-		Parent::setText(listView()->mapIdx(idx), text);
+		Parent::setText(idx, text);
 	}
 	QString text(colIdx idx) const
 	{
-		return Parent::text(listView()->mapIdx(idx));
+		return Parent::text(idx);
 	}
-	void setPixmap(colIdx idx, const QPixmap& pm)
+	void setPixmap(colIdx idx, const QIcon &icon)
 	{
-		Parent::setPixmap(listView()->mapIdx(idx), pm);
+		Parent::setIcon(idx, icon);
 	}
-	const QPixmap* pixmap(colIdx idx) const
+	const QIcon pixmap(colIdx idx) const
 	{
-		return Parent::pixmap(listView()->mapIdx(idx));
+		return icon(idx);
 	}
-	void paintCell(QPainter* p, const QColorGroup& cg, int column, int width, int align);
+	// TODO: Implement paintCell
 
 	ConfigItem* nextItem;
 	struct menu *menu;
@@ -216,9 +205,9 @@  class ConfigLineEdit : public QLineEdit {
 	ConfigItem *item;
 };
 
-class ConfigView : public Q3VBox {
+class ConfigView : public QWidget {
 	Q_OBJECT
-	typedef class Q3VBox Parent;
+	typedef class QWidget Parent;
 public:
 	ConfigView(QWidget* parent, const char *name = 0);
 	~ConfigView(void);
@@ -249,9 +238,9 @@  public slots:
 	static QAction *showPromptAction;
 };
 
-class ConfigInfoView : public Q3TextBrowser {
+class ConfigInfoView : public QTextBrowser {
 	Q_OBJECT
-	typedef class Q3TextBrowser Parent;
+	typedef class QTextBrowser Parent;
 public:
 	ConfigInfoView(QWidget* parent, const char *name = 0);
 	bool showDebug(void) const { return _showDebug; }
@@ -271,8 +260,8 @@  public slots:
 	QString debug_info(struct symbol *sym);
 	static QString print_filter(const QString &str);
 	static void expr_print_help(void *data, struct symbol *sym, const char *str);
-	Q3PopupMenu* createPopupMenu(const QPoint& pos);
-	void contentsContextMenuEvent(QContextMenuEvent *e);
+	QMenu *createStandardContextMenu(const QPoint & pos);
+	void contextMenuEvent(QContextMenuEvent *e);
 
 	struct symbol *sym;
 	struct menu *_menu;
@@ -299,10 +288,11 @@  public slots:
 	struct symbol **result;
 };
 
-class ConfigMainWindow : public Q3MainWindow {
+class ConfigMainWindow : public QMainWindow {
 	Q_OBJECT
 
-	static Q3Action *saveAction;
+	char *configname;
+	static QAction *saveAction;
 	static void conf_changed(void);
 public:
 	ConfigMainWindow(void);
@@ -331,8 +321,11 @@  public slots:
 	ConfigView *configView;
 	ConfigList *configList;
 	ConfigInfoView *helpText;
-	Q3ToolBar *toolBar;
-	Q3Action *backAction;
-	QSplitter* split1;
-	QSplitter* split2;
+	QToolBar *toolBar;
+	QAction *backAction;
+	QAction *singleViewAction;
+	QAction *splitViewAction;
+	QAction *fullViewAction;
+	QSplitter *split1;
+	QSplitter *split2;
 };
diff --git a/xen/tools/kconfig/streamline_config.pl b/xen/tools/kconfig/streamline_config.pl
index f3d3fb42b873..08d76d7b3b81 100755
--- a/xen/tools/kconfig/streamline_config.pl
+++ b/xen/tools/kconfig/streamline_config.pl
@@ -1,7 +1,7 @@ 
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0
 #
 # Copyright 2005-2009 - Steven Rostedt
-# Licensed under the terms of the GNU GPL License version 2
 #
 #  It's simple enough to figure out how this works.
 #  If not, then you can ask me at stripconfig@goodmis.org
@@ -42,6 +42,7 @@ 
 #    mv config_strip .config
 #    make oldconfig
 #
+use warnings;
 use strict;
 use Getopt::Long;
 
@@ -164,10 +165,10 @@  sub read_kconfig {
     my $last_source = "";
 
     # Check for any environment variables used
-    while ($source =~ /\$(\w+)/ && $last_source ne $source) {
+    while ($source =~ /\$\((\w+)\)/ && $last_source ne $source) {
 	my $env = $1;
 	$last_source = $source;
-	$source =~ s/\$$env/$ENV{$env}/;
+	$source =~ s/\$\($env\)/$ENV{$env}/;
     }
 
     open(my $kinfile, '<', $source) || die "Can't open $kconfig";
@@ -188,7 +189,7 @@  sub read_kconfig {
 	$cont = 0;
 
 	# collect any Kconfig sources
-	if (/^source\s*"(.*)"/) {
+	if (/^source\s+"?([^"]+)/) {
 	    my $kconfig = $1;
 	    # prevent reading twice.
 	    if (!defined($read_kconfigs{$kconfig})) {
@@ -237,7 +238,7 @@  sub read_kconfig {
 	    }
 
 	# configs without prompts must be selected
-	} elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
+	} elsif ($state ne "NONE" && /^\s*(tristate\s+\S|prompt\b)/) {
 	    # note if the config has a prompt
 	    $prompts{$config} = 1;
 
@@ -256,8 +257,8 @@  sub read_kconfig {
 
 	    $iflevel-- if ($iflevel);
 
-	# stop on "help"
-	} elsif (/^\s*help\s*$/) {
+	# stop on "help" and keywords that end a menu entry
+	} elsif (/^\s*(---)?help(---)?\s*$/ || /^(comment|choice|menu)\b/) {
 	    $state = "NONE";
 	}
     }
@@ -454,7 +455,7 @@  sub parse_config_depends
 	    $p =~ s/^[^$valid]*[$valid]+//;
 
 	    # We only need to process if the depend config is a module
-	    if (!defined($orig_configs{$conf}) || !$orig_configs{conf} eq "m") {
+	    if (!defined($orig_configs{$conf}) || $orig_configs{$conf} eq "y") {
 		next;
 	    }
 
@@ -610,6 +611,40 @@  foreach my $line (@config_file) {
 	next;
     }
 
+    if (/CONFIG_MODULE_SIG_KEY="(.+)"/) {
+        my $orig_cert = $1;
+        my $default_cert = "certs/signing_key.pem";
+
+        # Check that the logic in this script still matches the one in Kconfig
+        if (!defined($depends{"MODULE_SIG_KEY"}) ||
+            $depends{"MODULE_SIG_KEY"} !~ /"\Q$default_cert\E"/) {
+            print STDERR "WARNING: MODULE_SIG_KEY assertion failure, ",
+                "update needed to ", __FILE__, " line ", __LINE__, "\n";
+            print;
+        } elsif ($orig_cert ne $default_cert && ! -f $orig_cert) {
+            print STDERR "Module signature verification enabled but ",
+                "module signing key \"$orig_cert\" not found. Resetting ",
+                "signing key to default value.\n";
+            print "CONFIG_MODULE_SIG_KEY=\"$default_cert\"\n";
+        } else {
+            print;
+        }
+        next;
+    }
+
+    if (/CONFIG_SYSTEM_TRUSTED_KEYS="(.+)"/) {
+        my $orig_keys = $1;
+
+        if (! -f $orig_keys) {
+            print STDERR "System keyring enabled but keys \"$orig_keys\" ",
+                "not found. Resetting keys to default value.\n";
+            print "CONFIG_SYSTEM_TRUSTED_KEYS=\"\"\n";
+        } else {
+            print;
+        }
+        next;
+    }
+
     if (/^(CONFIG.*)=(m|y)/) {
 	if (defined($configs{$1})) {
 	    if ($localyesconfig) {
diff --git a/xen/tools/kconfig/symbol.c b/xen/tools/kconfig/symbol.c
index 50878dc025a5..f56eec5ea4c7 100644
--- a/xen/tools/kconfig/symbol.c
+++ b/xen/tools/kconfig/symbol.c
@@ -1,6 +1,6 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <ctype.h>
@@ -33,33 +33,6 @@  struct symbol *sym_defconfig_list;
 struct symbol *modules_sym;
 tristate modules_val;
 
-struct expr *sym_env_list;
-
-static void sym_add_default(struct symbol *sym, const char *def)
-{
-	struct property *prop = prop_alloc(P_DEFAULT, sym);
-
-	prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));
-}
-
-void sym_init(void)
-{
-	struct symbol *sym;
-	struct utsname uts;
-	static bool inited = false;
-
-	if (inited)
-		return;
-	inited = true;
-
-	uname(&uts);
-
-	sym = sym_lookup("UNAME_RELEASE", 0);
-	sym->type = S_STRING;
-	sym->flags |= SYMBOL_AUTO;
-	sym_add_default(sym, uts.release);
-}
-
 enum symbol_type sym_get_type(struct symbol *sym)
 {
 	enum symbol_type type = sym->type;
@@ -77,7 +50,7 @@  const char *sym_type_name(enum symbol_type type)
 {
 	switch (type) {
 	case S_BOOLEAN:
-		return "boolean";
+		return "bool";
 	case S_TRISTATE:
 		return "tristate";
 	case S_INT:
@@ -88,8 +61,6 @@  const char *sym_type_name(enum symbol_type type)
 		return "string";
 	case S_UNKNOWN:
 		return "unknown";
-	case S_OTHER:
-		break;
 	}
 	return "???";
 }
@@ -103,15 +74,6 @@  struct property *sym_get_choice_prop(struct symbol *sym)
 	return NULL;
 }
 
-struct property *sym_get_env_prop(struct symbol *sym)
-{
-	struct property *prop;
-
-	for_all_properties(sym, prop, P_ENV)
-		return prop;
-	return NULL;
-}
-
 static struct property *sym_get_default_prop(struct symbol *sym)
 {
 	struct property *prop;
@@ -124,7 +86,7 @@  static struct property *sym_get_default_prop(struct symbol *sym)
 	return NULL;
 }
 
-static struct property *sym_get_range_prop(struct symbol *sym)
+struct property *sym_get_range_prop(struct symbol *sym)
 {
 	struct property *prop;
 
@@ -183,7 +145,7 @@  static void sym_validate_range(struct symbol *sym)
 		sprintf(str, "%lld", val2);
 	else
 		sprintf(str, "0x%llx", val2);
-	sym->curr.val = strdup(str);
+	sym->curr.val = xstrdup(str);
 }
 
 static void sym_set_changed(struct symbol *sym)
@@ -209,12 +171,26 @@  static void sym_set_all_changed(void)
 static void sym_calc_visibility(struct symbol *sym)
 {
 	struct property *prop;
+	struct symbol *choice_sym = NULL;
 	tristate tri;
 
 	/* any prompt visible? */
 	tri = no;
+
+	if (sym_is_choice_value(sym))
+		choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
+
 	for_all_prompts(sym, prop) {
 		prop->visible.tri = expr_calc_value(prop->visible.expr);
+		/*
+		 * Tristate choice_values with visibility 'mod' are
+		 * not visible if the corresponding choice's value is
+		 * 'yes'.
+		 */
+		if (choice_sym && sym->type == S_TRISTATE &&
+		    prop->visible.tri == mod && choice_sym->curr.tri == yes)
+			prop->visible.tri = no;
+
 		tri = EXPR_OR(tri, prop->visible.tri);
 	}
 	if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
@@ -229,7 +205,7 @@  static void sym_calc_visibility(struct symbol *sym)
 	tri = yes;
 	if (sym->dir_dep.expr)
 		tri = expr_calc_value(sym->dir_dep.expr);
-	if (tri == mod)
+	if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
 		tri = yes;
 	if (sym->dir_dep.tri != tri) {
 		sym->dir_dep.tri = tri;
@@ -244,6 +220,15 @@  static void sym_calc_visibility(struct symbol *sym)
 		sym->rev_dep.tri = tri;
 		sym_set_changed(sym);
 	}
+	tri = no;
+	if (sym->implied.expr && sym->dir_dep.tri != no)
+		tri = expr_calc_value(sym->implied.expr);
+	if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
+		tri = yes;
+	if (sym->implied.tri != tri) {
+		sym->implied.tri = tri;
+		sym_set_changed(sym);
+	}
 }
 
 /*
@@ -310,6 +295,27 @@  static struct symbol *sym_calc_choice(struct symbol *sym)
 	return def_sym;
 }
 
+static void sym_warn_unmet_dep(struct symbol *sym)
+{
+	struct gstr gs = str_new();
+
+	str_printf(&gs,
+		   "\nWARNING: unmet direct dependencies detected for %s\n",
+		   sym->name);
+	str_printf(&gs,
+		   "  Depends on [%c]: ",
+		   sym->dir_dep.tri == mod ? 'm' : 'n');
+	expr_gstr_print(sym->dir_dep.expr, &gs);
+	str_printf(&gs, "\n");
+
+	expr_gstr_print_revdep(sym->rev_dep.expr, &gs, yes,
+			       "  Selected by [y]:\n");
+	expr_gstr_print_revdep(sym->rev_dep.expr, &gs, mod,
+			       "  Selected by [m]:\n");
+
+	fputs(str_get(&gs), stderr);
+}
+
 void sym_calc_value(struct symbol *sym)
 {
 	struct symbol_value newval, oldval;
@@ -348,11 +354,13 @@  void sym_calc_value(struct symbol *sym)
 		sym->curr.tri = no;
 		return;
 	}
-	if (!sym_is_choice_value(sym))
-		sym->flags &= ~SYMBOL_WRITE;
+	sym->flags &= ~SYMBOL_WRITE;
 
 	sym_calc_visibility(sym);
 
+	if (sym->visible != no)
+		sym->flags |= SYMBOL_WRITE;
+
 	/* set default if recursively called */
 	sym->curr = newval;
 
@@ -367,7 +375,6 @@  void sym_calc_value(struct symbol *sym)
 				/* if the symbol is visible use the user value
 				 * if available, otherwise try the default value
 				 */
-				sym->flags |= SYMBOL_WRITE;
 				if (sym_has_value(sym)) {
 					newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
 							      sym->visible);
@@ -379,38 +386,31 @@  void sym_calc_value(struct symbol *sym)
 			if (!sym_is_choice(sym)) {
 				prop = sym_get_default_prop(sym);
 				if (prop) {
-					sym->flags |= SYMBOL_WRITE;
 					newval.tri = EXPR_AND(expr_calc_value(prop->expr),
 							      prop->visible.tri);
+					if (newval.tri != no)
+						sym->flags |= SYMBOL_WRITE;
+				}
+				if (sym->implied.tri != no) {
+					sym->flags |= SYMBOL_WRITE;
+					newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
 				}
 			}
 		calc_newval:
-			if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
-				struct expr *e;
-				e = expr_simplify_unmet_dep(sym->rev_dep.expr,
-				    sym->dir_dep.expr);
-				fprintf(stderr, "warning: (");
-				expr_fprint(e, stderr);
-				fprintf(stderr, ") selects %s which has unmet direct dependencies (",
-					sym->name);
-				expr_fprint(sym->dir_dep.expr, stderr);
-				fprintf(stderr, ")\n");
-				expr_free(e);
-			}
+			if (sym->dir_dep.tri < sym->rev_dep.tri)
+				sym_warn_unmet_dep(sym);
 			newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
 		}
-		if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
+		if (newval.tri == mod &&
+		    (sym_get_type(sym) == S_BOOLEAN || sym->implied.tri == yes))
 			newval.tri = yes;
 		break;
 	case S_STRING:
 	case S_HEX:
 	case S_INT:
-		if (sym->visible != no) {
-			sym->flags |= SYMBOL_WRITE;
-			if (sym_has_value(sym)) {
-				newval.val = sym->def[S_DEF_USER].val;
-				break;
-			}
+		if (sym->visible != no && sym_has_value(sym)) {
+			newval.val = sym->def[S_DEF_USER].val;
+			break;
 		}
 		prop = sym_get_default_prop(sym);
 		if (prop) {
@@ -452,7 +452,7 @@  void sym_calc_value(struct symbol *sym)
 		}
 	}
 
-	if (sym->flags & SYMBOL_AUTO)
+	if (sym->flags & SYMBOL_NO_WRITE)
 		sym->flags &= ~SYMBOL_WRITE;
 
 	if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
@@ -484,6 +484,8 @@  bool sym_tristate_within_range(struct symbol *sym, tristate val)
 		return false;
 	if (sym->visible <= sym->rev_dep.tri)
 		return false;
+	if (sym->implied.tri == yes && val == mod)
+		return false;
 	if (sym_is_choice_value(sym) && sym->visible == yes)
 		return val == yes;
 	return val >= sym->rev_dep.tri && val <= sym->visible;
@@ -736,6 +738,10 @@  const char *sym_get_string_default(struct symbol *sym)
 	if (sym->type == S_BOOLEAN && val == mod)
 		val = yes;
 
+	/* adjust the default value if this symbol is implied by another */
+	if (val < sym->implied.tri)
+		val = sym->implied.tri;
+
 	switch (sym->type) {
 	case S_BOOLEAN:
 	case S_TRISTATE:
@@ -749,7 +755,6 @@  const char *sym_get_string_default(struct symbol *sym)
 		return str;
 	case S_STRING:
 		return str;
-	case S_OTHER:
 	case S_UNKNOWN:
 		break;
 	}
@@ -780,7 +785,7 @@  const char *sym_get_string_value(struct symbol *sym)
 	return (const char *)sym->curr.val;
 }
 
-bool sym_is_changable(struct symbol *sym)
+bool sym_is_changeable(struct symbol *sym)
 {
 	return sym->visible > sym->rev_dep.tri;
 }
@@ -817,7 +822,7 @@  struct symbol *sym_lookup(const char *name, int flags)
 				   : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
 				return symbol;
 		}
-		new_name = strdup(name);
+		new_name = xstrdup(name);
 	} else {
 		new_name = NULL;
 		hash = 0;
@@ -862,55 +867,6 @@  struct symbol *sym_find(const char *name)
 	return symbol;
 }
 
-/*
- * Expand symbol's names embedded in the string given in argument. Symbols'
- * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
- * the empty string.
- */
-const char *sym_expand_string_value(const char *in)
-{
-	const char *src;
-	char *res;
-	size_t reslen;
-
-	reslen = strlen(in) + 1;
-	res = xmalloc(reslen);
-	res[0] = '\0';
-
-	while ((src = strchr(in, '$'))) {
-		char *p, name[SYMBOL_MAXLENGTH];
-		const char *symval = "";
-		struct symbol *sym;
-		size_t newlen;
-
-		strncat(res, in, src - in);
-		src++;
-
-		p = name;
-		while (isalnum(*src) || *src == '_')
-			*p++ = *src++;
-		*p = '\0';
-
-		sym = sym_find(name);
-		if (sym != NULL) {
-			sym_calc_value(sym);
-			symval = sym_get_string_value(sym);
-		}
-
-		newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
-		if (newlen > reslen) {
-			reslen = newlen;
-			res = realloc(res, reslen);
-		}
-
-		strcat(res, symval);
-		in = src;
-	}
-	strcat(res, in);
-
-	return res;
-}
-
 const char *sym_escape_string_value(const char *in)
 {
 	const char *p;
@@ -1027,7 +983,7 @@  struct symbol **sym_re_search(const char *pattern)
 	}
 	if (sym_match_arr) {
 		qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
-		sym_arr = malloc((cnt+1) * sizeof(struct symbol));
+		sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
 		if (!sym_arr)
 			goto sym_re_search_free;
 		for (i = 0; i < cnt; i++)
@@ -1052,7 +1008,7 @@  static struct dep_stack {
 	struct dep_stack *prev, *next;
 	struct symbol *sym;
 	struct property *prop;
-	struct expr *expr;
+	struct expr **expr;
 } *check_top;
 
 static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
@@ -1116,35 +1072,52 @@  static void sym_check_print_recursive(struct symbol *last_sym)
 		if (stack->sym == last_sym)
 			fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
 				prop->file->name, prop->lineno);
-		if (stack->expr) {
-			fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
-				prop->file->name, prop->lineno,
+
+		if (sym_is_choice(sym)) {
+			fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
+				menu->file->name, menu->lineno,
+				sym->name ? sym->name : "<choice>",
+				next_sym->name ? next_sym->name : "<choice>");
+		} else if (sym_is_choice_value(sym)) {
+			fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
+				menu->file->name, menu->lineno,
 				sym->name ? sym->name : "<choice>",
-				prop_get_type_name(prop->type),
 				next_sym->name ? next_sym->name : "<choice>");
-		} else if (stack->prop) {
+		} else if (stack->expr == &sym->dir_dep.expr) {
 			fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
 				prop->file->name, prop->lineno,
 				sym->name ? sym->name : "<choice>",
 				next_sym->name ? next_sym->name : "<choice>");
-		} else if (sym_is_choice(sym)) {
-			fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
-				menu->file->name, menu->lineno,
+		} else if (stack->expr == &sym->rev_dep.expr) {
+			fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
+				prop->file->name, prop->lineno,
 				sym->name ? sym->name : "<choice>",
 				next_sym->name ? next_sym->name : "<choice>");
-		} else if (sym_is_choice_value(sym)) {
-			fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
-				menu->file->name, menu->lineno,
+		} else if (stack->expr == &sym->implied.expr) {
+			fprintf(stderr, "%s:%d:\tsymbol %s is implied by %s\n",
+				prop->file->name, prop->lineno,
 				sym->name ? sym->name : "<choice>",
 				next_sym->name ? next_sym->name : "<choice>");
+		} else if (stack->expr) {
+			fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
+				prop->file->name, prop->lineno,
+				sym->name ? sym->name : "<choice>",
+				prop_get_type_name(prop->type),
+				next_sym->name ? next_sym->name : "<choice>");
 		} else {
-			fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
+			fprintf(stderr, "%s:%d:\tsymbol %s %s is visible depending on %s\n",
 				prop->file->name, prop->lineno,
 				sym->name ? sym->name : "<choice>",
+				prop_get_type_name(prop->type),
 				next_sym->name ? next_sym->name : "<choice>");
 		}
 	}
 
+	fprintf(stderr,
+		"For a resolution refer to Documentation/kbuild/kconfig-language.rst\n"
+		"subsection \"Kconfig recursive dependency limitations\"\n"
+		"\n");
+
 	if (check_top == &cv_stack)
 		dep_stack_remove();
 }
@@ -1179,7 +1152,7 @@  static struct symbol *sym_check_expr_deps(struct expr *e)
 	default:
 		break;
 	}
-	printf("Oops! How to check %d?\n", e->type);
+	fprintf(stderr, "Oops! How to check %d?\n", e->type);
 	return NULL;
 }
 
@@ -1192,12 +1165,26 @@  static struct symbol *sym_check_sym_deps(struct symbol *sym)
 
 	dep_stack_insert(&stack, sym);
 
+	stack.expr = &sym->dir_dep.expr;
+	sym2 = sym_check_expr_deps(sym->dir_dep.expr);
+	if (sym2)
+		goto out;
+
+	stack.expr = &sym->rev_dep.expr;
 	sym2 = sym_check_expr_deps(sym->rev_dep.expr);
 	if (sym2)
 		goto out;
 
+	stack.expr = &sym->implied.expr;
+	sym2 = sym_check_expr_deps(sym->implied.expr);
+	if (sym2)
+		goto out;
+
+	stack.expr = NULL;
+
 	for (prop = sym->prop; prop; prop = prop->next) {
-		if (prop->type == P_CHOICE || prop->type == P_SELECT)
+		if (prop->type == P_CHOICE || prop->type == P_SELECT ||
+		    prop->type == P_IMPLY)
 			continue;
 		stack.prop = prop;
 		sym2 = sym_check_expr_deps(prop->visible.expr);
@@ -1205,7 +1192,7 @@  static struct symbol *sym_check_sym_deps(struct symbol *sym)
 			break;
 		if (prop->type != P_DEFAULT || sym_is_choice(sym))
 			continue;
-		stack.expr = prop->expr;
+		stack.expr = &prop->expr;
 		sym2 = sym_check_expr_deps(prop->expr);
 		if (sym2)
 			break;
@@ -1283,9 +1270,6 @@  struct symbol *sym_check_deps(struct symbol *sym)
 		sym->flags &= ~SYMBOL_CHECK;
 	}
 
-	if (sym2 && sym2 == sym)
-		sym2 = NULL;
-
 	return sym2;
 }
 
@@ -1324,8 +1308,6 @@  const char *prop_get_type_name(enum prop_type type)
 	switch (type) {
 	case P_PROMPT:
 		return "prompt";
-	case P_ENV:
-		return "env";
 	case P_COMMENT:
 		return "comment";
 	case P_MENU:
@@ -1336,6 +1318,8 @@  const char *prop_get_type_name(enum prop_type type)
 		return "choice";
 	case P_SELECT:
 		return "select";
+	case P_IMPLY:
+		return "imply";
 	case P_RANGE:
 		return "range";
 	case P_SYMBOL:
@@ -1345,32 +1329,3 @@  const char *prop_get_type_name(enum prop_type type)
 	}
 	return "unknown";
 }
-
-static void prop_add_env(const char *env)
-{
-	struct symbol *sym, *sym2;
-	struct property *prop;
-	char *p;
-
-	sym = current_entry->sym;
-	sym->flags |= SYMBOL_AUTO;
-	for_all_properties(sym, prop, P_ENV) {
-		sym2 = prop_get_symbol(prop);
-		if (strcmp(sym2->name, env))
-			menu_warn(current_entry, "redefining environment symbol from %s",
-				  sym2->name);
-		return;
-	}
-
-	prop = prop_alloc(P_ENV, sym);
-	prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
-
-	sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
-	sym_env_list->right.sym = sym;
-
-	p = getenv(env);
-	if (p)
-		sym_add_default(sym, p);
-	else
-		menu_warn(current_entry, "environment variable %s undefined", env);
-}
diff --git a/xen/tools/kconfig/tests/auto_submenu/Kconfig b/xen/tools/kconfig/tests/auto_submenu/Kconfig
new file mode 100644
index 000000000000..b20761edc2f4
--- /dev/null
+++ b/xen/tools/kconfig/tests/auto_submenu/Kconfig
@@ -0,0 +1,52 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config A
+	bool "A"
+	default y
+
+config A0
+	bool "A0"
+	depends on A
+	default y
+	help
+	  This depends on A, so should be a submenu of A.
+
+config A0_0
+	bool "A1_0"
+	depends on A0
+	help
+	  Submenus are created recursively.
+	  This should be a submenu of A0.
+
+config A1
+	bool "A1"
+	depends on A
+	default y
+	help
+	  This should line up with A0.
+
+choice
+	prompt "choice"
+	depends on A1
+	help
+	  Choice should become a submenu as well.
+
+config A1_0
+	bool "A1_0"
+
+config A1_1
+	bool "A1_1"
+
+endchoice
+
+config B
+	bool "B"
+	help
+	  This is independent of A.
+
+config C
+	bool "C"
+	depends on A
+	help
+	  This depends on A, but not a consecutive item, so can/should not
+	  be a submenu.
diff --git a/xen/tools/kconfig/tests/auto_submenu/__init__.py b/xen/tools/kconfig/tests/auto_submenu/__init__.py
new file mode 100644
index 000000000000..25abd927fd0a
--- /dev/null
+++ b/xen/tools/kconfig/tests/auto_submenu/__init__.py
@@ -0,0 +1,13 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Create submenu for symbols that depend on the preceding one.
+
+If a symbols has dependency on the preceding symbol, the menu entry
+should become the submenu of the preceding one, and displayed with
+deeper indentation.
+"""
+
+
+def test(conf):
+    assert conf.oldaskconfig() == 0
+    assert conf.stdout_contains('expected_stdout')
diff --git a/xen/tools/kconfig/tests/auto_submenu/expected_stdout b/xen/tools/kconfig/tests/auto_submenu/expected_stdout
new file mode 100644
index 000000000000..bf5236f39a56
--- /dev/null
+++ b/xen/tools/kconfig/tests/auto_submenu/expected_stdout
@@ -0,0 +1,10 @@ 
+A (A) [Y/n/?] (NEW) 
+  A0 (A0) [Y/n/?] (NEW) 
+    A1_0 (A0_0) [N/y/?] (NEW) 
+  A1 (A1) [Y/n/?] (NEW) 
+    choice
+    > 1. A1_0 (A1_0) (NEW)
+      2. A1_1 (A1_1) (NEW)
+    choice[1-2?]: 
+B (B) [N/y/?] (NEW) 
+C (C) [N/y/?] (NEW) 
diff --git a/xen/tools/kconfig/tests/choice/Kconfig b/xen/tools/kconfig/tests/choice/Kconfig
new file mode 100644
index 000000000000..a412205b1b0c
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/Kconfig
@@ -0,0 +1,56 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config MODULES
+	bool "Enable loadable module support"
+	option modules
+	default y
+
+choice
+	prompt "boolean choice"
+	default BOOL_CHOICE1
+
+config BOOL_CHOICE0
+	bool "choice 0"
+
+config BOOL_CHOICE1
+	bool "choice 1"
+
+endchoice
+
+choice
+	prompt "optional boolean choice"
+	optional
+	default OPT_BOOL_CHOICE1
+
+config OPT_BOOL_CHOICE0
+	bool "choice 0"
+
+config OPT_BOOL_CHOICE1
+	bool "choice 1"
+
+endchoice
+
+choice
+	prompt "tristate choice"
+	default TRI_CHOICE1
+
+config TRI_CHOICE0
+	tristate "choice 0"
+
+config TRI_CHOICE1
+	tristate "choice 1"
+
+endchoice
+
+choice
+	prompt "optional tristate choice"
+	optional
+	default OPT_TRI_CHOICE1
+
+config OPT_TRI_CHOICE0
+	tristate "choice 0"
+
+config OPT_TRI_CHOICE1
+	tristate "choice 1"
+
+endchoice
diff --git a/xen/tools/kconfig/tests/choice/__init__.py b/xen/tools/kconfig/tests/choice/__init__.py
new file mode 100644
index 000000000000..4318fce05912
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/__init__.py
@@ -0,0 +1,41 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Basic choice tests.
+
+The handling of 'choice' is a bit complicated part in Kconfig.
+
+The behavior of 'y' choice is intuitive.  If choice values are tristate,
+the choice can be 'm' where each value can be enabled independently.
+Also, if a choice is marked as 'optional', the whole choice can be
+invisible.
+"""
+
+
+def test_oldask0(conf):
+    assert conf.oldaskconfig() == 0
+    assert conf.stdout_contains('oldask0_expected_stdout')
+
+
+def test_oldask1(conf):
+    assert conf.oldaskconfig('oldask1_config') == 0
+    assert conf.stdout_contains('oldask1_expected_stdout')
+
+
+def test_allyes(conf):
+    assert conf.allyesconfig() == 0
+    assert conf.config_contains('allyes_expected_config')
+
+
+def test_allmod(conf):
+    assert conf.allmodconfig() == 0
+    assert conf.config_contains('allmod_expected_config')
+
+
+def test_allno(conf):
+    assert conf.allnoconfig() == 0
+    assert conf.config_contains('allno_expected_config')
+
+
+def test_alldef(conf):
+    assert conf.alldefconfig() == 0
+    assert conf.config_contains('alldef_expected_config')
diff --git a/xen/tools/kconfig/tests/choice/alldef_expected_config b/xen/tools/kconfig/tests/choice/alldef_expected_config
new file mode 100644
index 000000000000..7a754bf4be94
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/alldef_expected_config
@@ -0,0 +1,5 @@ 
+CONFIG_MODULES=y
+# CONFIG_BOOL_CHOICE0 is not set
+CONFIG_BOOL_CHOICE1=y
+# CONFIG_TRI_CHOICE0 is not set
+# CONFIG_TRI_CHOICE1 is not set
diff --git a/xen/tools/kconfig/tests/choice/allmod_expected_config b/xen/tools/kconfig/tests/choice/allmod_expected_config
new file mode 100644
index 000000000000..f1f5dcdb7923
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/allmod_expected_config
@@ -0,0 +1,9 @@ 
+CONFIG_MODULES=y
+# CONFIG_BOOL_CHOICE0 is not set
+CONFIG_BOOL_CHOICE1=y
+# CONFIG_OPT_BOOL_CHOICE0 is not set
+CONFIG_OPT_BOOL_CHOICE1=y
+CONFIG_TRI_CHOICE0=m
+CONFIG_TRI_CHOICE1=m
+CONFIG_OPT_TRI_CHOICE0=m
+CONFIG_OPT_TRI_CHOICE1=m
diff --git a/xen/tools/kconfig/tests/choice/allno_expected_config b/xen/tools/kconfig/tests/choice/allno_expected_config
new file mode 100644
index 000000000000..b88ee7a43136
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/allno_expected_config
@@ -0,0 +1,5 @@ 
+# CONFIG_MODULES is not set
+# CONFIG_BOOL_CHOICE0 is not set
+CONFIG_BOOL_CHOICE1=y
+# CONFIG_TRI_CHOICE0 is not set
+CONFIG_TRI_CHOICE1=y
diff --git a/xen/tools/kconfig/tests/choice/allyes_expected_config b/xen/tools/kconfig/tests/choice/allyes_expected_config
new file mode 100644
index 000000000000..e5a062a1157c
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/allyes_expected_config
@@ -0,0 +1,9 @@ 
+CONFIG_MODULES=y
+# CONFIG_BOOL_CHOICE0 is not set
+CONFIG_BOOL_CHOICE1=y
+# CONFIG_OPT_BOOL_CHOICE0 is not set
+CONFIG_OPT_BOOL_CHOICE1=y
+# CONFIG_TRI_CHOICE0 is not set
+CONFIG_TRI_CHOICE1=y
+# CONFIG_OPT_TRI_CHOICE0 is not set
+CONFIG_OPT_TRI_CHOICE1=y
diff --git a/xen/tools/kconfig/tests/choice/oldask0_expected_stdout b/xen/tools/kconfig/tests/choice/oldask0_expected_stdout
new file mode 100644
index 000000000000..b251bba9698b
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/oldask0_expected_stdout
@@ -0,0 +1,10 @@ 
+Enable loadable module support (MODULES) [Y/n/?] (NEW) 
+boolean choice
+  1. choice 0 (BOOL_CHOICE0) (NEW)
+> 2. choice 1 (BOOL_CHOICE1) (NEW)
+choice[1-2?]: 
+optional boolean choice [N/y/?] (NEW) 
+tristate choice [M/y/?] (NEW) 
+  choice 0 (TRI_CHOICE0) [N/m/?] (NEW) 
+  choice 1 (TRI_CHOICE1) [N/m/?] (NEW) 
+optional tristate choice [N/m/y/?] (NEW) 
diff --git a/xen/tools/kconfig/tests/choice/oldask1_config b/xen/tools/kconfig/tests/choice/oldask1_config
new file mode 100644
index 000000000000..b67bfe3c641f
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/oldask1_config
@@ -0,0 +1,2 @@ 
+# CONFIG_MODULES is not set
+CONFIG_OPT_BOOL_CHOICE0=y
diff --git a/xen/tools/kconfig/tests/choice/oldask1_expected_stdout b/xen/tools/kconfig/tests/choice/oldask1_expected_stdout
new file mode 100644
index 000000000000..c2125e9bf96a
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice/oldask1_expected_stdout
@@ -0,0 +1,15 @@ 
+Enable loadable module support (MODULES) [N/y/?] 
+boolean choice
+  1. choice 0 (BOOL_CHOICE0) (NEW)
+> 2. choice 1 (BOOL_CHOICE1) (NEW)
+choice[1-2?]: 
+optional boolean choice [Y/n/?] (NEW) 
+optional boolean choice
+> 1. choice 0 (OPT_BOOL_CHOICE0)
+  2. choice 1 (OPT_BOOL_CHOICE1) (NEW)
+choice[1-2?]: 
+tristate choice
+  1. choice 0 (TRI_CHOICE0) (NEW)
+> 2. choice 1 (TRI_CHOICE1) (NEW)
+choice[1-2?]: 
+optional tristate choice [N/y/?] 
diff --git a/xen/tools/kconfig/tests/choice_value_with_m_dep/Kconfig b/xen/tools/kconfig/tests/choice_value_with_m_dep/Kconfig
new file mode 100644
index 000000000000..7106c26bb3a8
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice_value_with_m_dep/Kconfig
@@ -0,0 +1,21 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config MODULES
+	def_bool y
+	option modules
+
+config DEP
+	tristate
+	default m
+
+choice
+	prompt "Tristate Choice"
+
+config CHOICE0
+	tristate "Choice 0"
+
+config CHOICE1
+	tristate "Choice 1"
+	depends on DEP
+
+endchoice
diff --git a/xen/tools/kconfig/tests/choice_value_with_m_dep/__init__.py b/xen/tools/kconfig/tests/choice_value_with_m_dep/__init__.py
new file mode 100644
index 000000000000..075b4e08696e
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice_value_with_m_dep/__init__.py
@@ -0,0 +1,16 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Hide tristate choice values with mod dependency in y choice.
+
+If tristate choice values depend on symbols set to 'm', they should be
+hidden when the choice containing them is changed from 'm' to 'y'
+(i.e. exclusive choice).
+
+Related Linux commit: fa64e5f6a35efd5e77d639125d973077ca506074
+"""
+
+
+def test(conf):
+    assert conf.oldaskconfig('config', 'y') == 0
+    assert conf.config_contains('expected_config')
+    assert conf.stdout_contains('expected_stdout')
diff --git a/xen/tools/kconfig/tests/choice_value_with_m_dep/config b/xen/tools/kconfig/tests/choice_value_with_m_dep/config
new file mode 100644
index 000000000000..3a126b7a2546
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice_value_with_m_dep/config
@@ -0,0 +1,2 @@ 
+CONFIG_CHOICE0=m
+CONFIG_CHOICE1=m
diff --git a/xen/tools/kconfig/tests/choice_value_with_m_dep/expected_config b/xen/tools/kconfig/tests/choice_value_with_m_dep/expected_config
new file mode 100644
index 000000000000..4d07b449540e
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice_value_with_m_dep/expected_config
@@ -0,0 +1,3 @@ 
+CONFIG_MODULES=y
+CONFIG_DEP=m
+CONFIG_CHOICE0=y
diff --git a/xen/tools/kconfig/tests/choice_value_with_m_dep/expected_stdout b/xen/tools/kconfig/tests/choice_value_with_m_dep/expected_stdout
new file mode 100644
index 000000000000..2b50ab65c86a
--- /dev/null
+++ b/xen/tools/kconfig/tests/choice_value_with_m_dep/expected_stdout
@@ -0,0 +1,4 @@ 
+Tristate Choice [M/y/?] y
+Tristate Choice
+> 1. Choice 0 (CHOICE0)
+choice[1]: 1
diff --git a/xen/tools/kconfig/tests/conftest.py b/xen/tools/kconfig/tests/conftest.py
new file mode 100644
index 000000000000..0345ef6e3273
--- /dev/null
+++ b/xen/tools/kconfig/tests/conftest.py
@@ -0,0 +1,291 @@ 
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>
+#
+
+"""
+Kconfig unit testing framework.
+
+This provides fixture functions commonly used from test files.
+"""
+
+import os
+import pytest
+import shutil
+import subprocess
+import tempfile
+
+CONF_PATH = os.path.abspath(os.path.join('scripts', 'kconfig', 'conf'))
+
+
+class Conf:
+    """Kconfig runner and result checker.
+
+    This class provides methods to run text-based interface of Kconfig
+    (scripts/kconfig/conf) and retrieve the resulted configuration,
+    stdout, and stderr.  It also provides methods to compare those
+    results with expectations.
+    """
+
+    def __init__(self, request):
+        """Create a new Conf instance.
+
+        request: object to introspect the requesting test module
+        """
+        # the directory of the test being run
+        self._test_dir = os.path.dirname(str(request.fspath))
+
+    # runners
+    def _run_conf(self, mode, dot_config=None, out_file='.config',
+                  interactive=False, in_keys=None, extra_env={}):
+        """Run text-based Kconfig executable and save the result.
+
+        mode: input mode option (--oldaskconfig, --defconfig=<file> etc.)
+        dot_config: .config file to use for configuration base
+        out_file: file name to contain the output config data
+        interactive: flag to specify the interactive mode
+        in_keys: key inputs for interactive modes
+        extra_env: additional environments
+        returncode: exit status of the Kconfig executable
+        """
+        command = [CONF_PATH, mode, 'Kconfig']
+
+        # Override 'srctree' environment to make the test as the top directory
+        extra_env['srctree'] = self._test_dir
+
+        # Run Kconfig in a temporary directory.
+        # This directory is automatically removed when done.
+        with tempfile.TemporaryDirectory() as temp_dir:
+
+            # if .config is given, copy it to the working directory
+            if dot_config:
+                shutil.copyfile(os.path.join(self._test_dir, dot_config),
+                                os.path.join(temp_dir, '.config'))
+
+            ps = subprocess.Popen(command,
+                                  stdin=subprocess.PIPE,
+                                  stdout=subprocess.PIPE,
+                                  stderr=subprocess.PIPE,
+                                  cwd=temp_dir,
+                                  env=dict(os.environ, **extra_env))
+
+            # If input key sequence is given, feed it to stdin.
+            if in_keys:
+                ps.stdin.write(in_keys.encode('utf-8'))
+
+            while ps.poll() is None:
+                # For interactive modes such as oldaskconfig, oldconfig,
+                # send 'Enter' key until the program finishes.
+                if interactive:
+                    ps.stdin.write(b'\n')
+
+            self.retcode = ps.returncode
+            self.stdout = ps.stdout.read().decode()
+            self.stderr = ps.stderr.read().decode()
+
+            # Retrieve the resulted config data only when .config is supposed
+            # to exist.  If the command fails, the .config does not exist.
+            # 'listnewconfig' does not produce .config in the first place.
+            if self.retcode == 0 and out_file:
+                with open(os.path.join(temp_dir, out_file)) as f:
+                    self.config = f.read()
+            else:
+                self.config = None
+
+        # Logging:
+        # Pytest captures the following information by default.  In failure
+        # of tests, the captured log will be displayed.  This will be useful to
+        # figure out what has happened.
+
+        print("[command]\n{}\n".format(' '.join(command)))
+
+        print("[retcode]\n{}\n".format(self.retcode))
+
+        print("[stdout]")
+        print(self.stdout)
+
+        print("[stderr]")
+        print(self.stderr)
+
+        if self.config is not None:
+            print("[output for '{}']".format(out_file))
+            print(self.config)
+
+        return self.retcode
+
+    def oldaskconfig(self, dot_config=None, in_keys=None):
+        """Run oldaskconfig.
+
+        dot_config: .config file to use for configuration base (optional)
+        in_key: key inputs (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._run_conf('--oldaskconfig', dot_config=dot_config,
+                              interactive=True, in_keys=in_keys)
+
+    def oldconfig(self, dot_config=None, in_keys=None):
+        """Run oldconfig.
+
+        dot_config: .config file to use for configuration base (optional)
+        in_key: key inputs (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._run_conf('--oldconfig', dot_config=dot_config,
+                              interactive=True, in_keys=in_keys)
+
+    def olddefconfig(self, dot_config=None):
+        """Run olddefconfig.
+
+        dot_config: .config file to use for configuration base (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._run_conf('--olddefconfig', dot_config=dot_config)
+
+    def defconfig(self, defconfig):
+        """Run defconfig.
+
+        defconfig: defconfig file for input
+        returncode: exit status of the Kconfig executable
+        """
+        defconfig_path = os.path.join(self._test_dir, defconfig)
+        return self._run_conf('--defconfig={}'.format(defconfig_path))
+
+    def _allconfig(self, mode, all_config):
+        if all_config:
+            all_config_path = os.path.join(self._test_dir, all_config)
+            extra_env = {'KCONFIG_ALLCONFIG': all_config_path}
+        else:
+            extra_env = {}
+
+        return self._run_conf('--{}config'.format(mode), extra_env=extra_env)
+
+    def allyesconfig(self, all_config=None):
+        """Run allyesconfig.
+
+        all_config: fragment config file for KCONFIG_ALLCONFIG (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._allconfig('allyes', all_config)
+
+    def allmodconfig(self, all_config=None):
+        """Run allmodconfig.
+
+        all_config: fragment config file for KCONFIG_ALLCONFIG (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._allconfig('allmod', all_config)
+
+    def allnoconfig(self, all_config=None):
+        """Run allnoconfig.
+
+        all_config: fragment config file for KCONFIG_ALLCONFIG (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._allconfig('allno', all_config)
+
+    def alldefconfig(self, all_config=None):
+        """Run alldefconfig.
+
+        all_config: fragment config file for KCONFIG_ALLCONFIG (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._allconfig('alldef', all_config)
+
+    def randconfig(self, all_config=None):
+        """Run randconfig.
+
+        all_config: fragment config file for KCONFIG_ALLCONFIG (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._allconfig('rand', all_config)
+
+    def savedefconfig(self, dot_config):
+        """Run savedefconfig.
+
+        dot_config: .config file for input
+        returncode: exit status of the Kconfig executable
+        """
+        return self._run_conf('--savedefconfig', out_file='defconfig')
+
+    def listnewconfig(self, dot_config=None):
+        """Run listnewconfig.
+
+        dot_config: .config file to use for configuration base (optional)
+        returncode: exit status of the Kconfig executable
+        """
+        return self._run_conf('--listnewconfig', dot_config=dot_config,
+                              out_file=None)
+
+    # checkers
+    def _read_and_compare(self, compare, expected):
+        """Compare the result with expectation.
+
+        compare: function to compare the result with expectation
+        expected: file that contains the expected data
+        """
+        with open(os.path.join(self._test_dir, expected)) as f:
+            expected_data = f.read()
+        return compare(self, expected_data)
+
+    def _contains(self, attr, expected):
+        return self._read_and_compare(
+                                    lambda s, e: getattr(s, attr).find(e) >= 0,
+                                    expected)
+
+    def _matches(self, attr, expected):
+        return self._read_and_compare(lambda s, e: getattr(s, attr) == e,
+                                      expected)
+
+    def config_contains(self, expected):
+        """Check if resulted configuration contains expected data.
+
+        expected: file that contains the expected data
+        returncode: True if result contains the expected data, False otherwise
+        """
+        return self._contains('config', expected)
+
+    def config_matches(self, expected):
+        """Check if resulted configuration exactly matches expected data.
+
+        expected: file that contains the expected data
+        returncode: True if result matches the expected data, False otherwise
+        """
+        return self._matches('config', expected)
+
+    def stdout_contains(self, expected):
+        """Check if resulted stdout contains expected data.
+
+        expected: file that contains the expected data
+        returncode: True if result contains the expected data, False otherwise
+        """
+        return self._contains('stdout', expected)
+
+    def stdout_matches(self, expected):
+        """Check if resulted stdout exactly matches expected data.
+
+        expected: file that contains the expected data
+        returncode: True if result matches the expected data, False otherwise
+        """
+        return self._matches('stdout', expected)
+
+    def stderr_contains(self, expected):
+        """Check if resulted stderr contains expected data.
+
+        expected: file that contains the expected data
+        returncode: True if result contains the expected data, False otherwise
+        """
+        return self._contains('stderr', expected)
+
+    def stderr_matches(self, expected):
+        """Check if resulted stderr exactly matches expected data.
+
+        expected: file that contains the expected data
+        returncode: True if result matches the expected data, False otherwise
+        """
+        return self._matches('stderr', expected)
+
+
+@pytest.fixture(scope="module")
+def conf(request):
+    """Create a Conf instance and provide it to test functions."""
+    return Conf(request)
diff --git a/xen/tools/kconfig/tests/err_recursive_dep/Kconfig b/xen/tools/kconfig/tests/err_recursive_dep/Kconfig
new file mode 100644
index 000000000000..ebdb3ffd8717
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_dep/Kconfig
@@ -0,0 +1,63 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+# depends on itself
+
+config A
+	bool "A"
+	depends on A
+
+# select itself
+
+config B
+	bool
+	select B
+
+# depends on each other
+
+config C1
+	bool "C1"
+	depends on C2
+
+config C2
+	bool "C2"
+	depends on C1
+
+# depends on and select
+
+config D1
+	bool "D1"
+	depends on D2
+	select D2
+
+config D2
+	bool
+
+# depends on and imply
+
+config E1
+	bool "E1"
+	depends on E2
+	imply E2
+
+config E2
+	bool "E2"
+
+# property
+
+config F1
+	bool "F1"
+	default F2
+
+config F2
+	bool "F2"
+	depends on F1
+
+# menu
+
+menu "menu depending on its content"
+	depends on G
+
+config G
+	bool "G"
+
+endmenu
diff --git a/xen/tools/kconfig/tests/err_recursive_dep/__init__.py b/xen/tools/kconfig/tests/err_recursive_dep/__init__.py
new file mode 100644
index 000000000000..5f3821b43ce6
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_dep/__init__.py
@@ -0,0 +1,10 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Detect recursive dependency error.
+
+Recursive dependency should be treated as an error.
+"""
+
+def test(conf):
+    assert conf.oldaskconfig() == 1
+    assert conf.stderr_contains('expected_stderr')
diff --git a/xen/tools/kconfig/tests/err_recursive_dep/expected_stderr b/xen/tools/kconfig/tests/err_recursive_dep/expected_stderr
new file mode 100644
index 000000000000..c9f4abf9a791
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_dep/expected_stderr
@@ -0,0 +1,38 @@ 
+Kconfig:11:error: recursive dependency detected!
+Kconfig:11:	symbol B is selected by B
+For a resolution refer to Documentation/kbuild/kconfig-language.rst
+subsection "Kconfig recursive dependency limitations"
+
+Kconfig:5:error: recursive dependency detected!
+Kconfig:5:	symbol A depends on A
+For a resolution refer to Documentation/kbuild/kconfig-language.rst
+subsection "Kconfig recursive dependency limitations"
+
+Kconfig:17:error: recursive dependency detected!
+Kconfig:17:	symbol C1 depends on C2
+Kconfig:21:	symbol C2 depends on C1
+For a resolution refer to Documentation/kbuild/kconfig-language.rst
+subsection "Kconfig recursive dependency limitations"
+
+Kconfig:32:error: recursive dependency detected!
+Kconfig:32:	symbol D2 is selected by D1
+Kconfig:27:	symbol D1 depends on D2
+For a resolution refer to Documentation/kbuild/kconfig-language.rst
+subsection "Kconfig recursive dependency limitations"
+
+Kconfig:37:error: recursive dependency detected!
+Kconfig:37:	symbol E1 depends on E2
+Kconfig:42:	symbol E2 is implied by E1
+For a resolution refer to Documentation/kbuild/kconfig-language.rst
+subsection "Kconfig recursive dependency limitations"
+
+Kconfig:60:error: recursive dependency detected!
+Kconfig:60:	symbol G depends on G
+For a resolution refer to Documentation/kbuild/kconfig-language.rst
+subsection "Kconfig recursive dependency limitations"
+
+Kconfig:51:error: recursive dependency detected!
+Kconfig:51:	symbol F2 depends on F1
+Kconfig:49:	symbol F1 default value contains F2
+For a resolution refer to Documentation/kbuild/kconfig-language.rst
+subsection "Kconfig recursive dependency limitations"
diff --git a/xen/tools/kconfig/tests/err_recursive_inc/Kconfig b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig
new file mode 100644
index 000000000000..c6f4adec76d1
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig
@@ -0,0 +1,2 @@ 
+# SPDX-License-Identifier: GPL-2.0-only
+source "Kconfig.inc1"
diff --git a/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc1 b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc1
new file mode 100644
index 000000000000..01cbf0d69cce
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc1
@@ -0,0 +1,5 @@ 
+# SPDX-License-Identifier: GPL-2.0-only
+
+
+
+source "Kconfig.inc2"
diff --git a/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc2 b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc2
new file mode 100644
index 000000000000..82351075ab1b
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc2
@@ -0,0 +1,4 @@ 
+# SPDX-License-Identifier: GPL-2.0-only
+
+
+source "Kconfig.inc3"
diff --git a/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc3 b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc3
new file mode 100644
index 000000000000..c6f4adec76d1
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_inc/Kconfig.inc3
@@ -0,0 +1,2 @@ 
+# SPDX-License-Identifier: GPL-2.0-only
+source "Kconfig.inc1"
diff --git a/xen/tools/kconfig/tests/err_recursive_inc/__init__.py b/xen/tools/kconfig/tests/err_recursive_inc/__init__.py
new file mode 100644
index 000000000000..27aa1895a0b2
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_inc/__init__.py
@@ -0,0 +1,11 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Detect recursive inclusion error.
+
+If recursive inclusion is detected, it should fail with error messages.
+"""
+
+
+def test(conf):
+    assert conf.oldaskconfig() != 0
+    assert conf.stderr_contains('expected_stderr')
diff --git a/xen/tools/kconfig/tests/err_recursive_inc/expected_stderr b/xen/tools/kconfig/tests/err_recursive_inc/expected_stderr
new file mode 100644
index 000000000000..b070a31fdfeb
--- /dev/null
+++ b/xen/tools/kconfig/tests/err_recursive_inc/expected_stderr
@@ -0,0 +1,6 @@ 
+Recursive inclusion detected.
+Inclusion path:
+  current file : Kconfig.inc1
+  included from: Kconfig.inc3:2
+  included from: Kconfig.inc2:4
+  included from: Kconfig.inc1:5
diff --git a/xen/tools/kconfig/tests/inter_choice/Kconfig b/xen/tools/kconfig/tests/inter_choice/Kconfig
new file mode 100644
index 000000000000..5698a4018dd0
--- /dev/null
+++ b/xen/tools/kconfig/tests/inter_choice/Kconfig
@@ -0,0 +1,25 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config MODULES
+	def_bool y
+	option modules
+
+choice
+	prompt "Choice"
+
+config CHOICE_VAL0
+	tristate "Choice 0"
+
+config CHOIVE_VAL1
+	tristate "Choice 1"
+
+endchoice
+
+choice
+	prompt "Another choice"
+	depends on CHOICE_VAL0
+
+config DUMMY
+	bool "dummy"
+
+endchoice
diff --git a/xen/tools/kconfig/tests/inter_choice/__init__.py b/xen/tools/kconfig/tests/inter_choice/__init__.py
new file mode 100644
index 000000000000..ffea6b1148a6
--- /dev/null
+++ b/xen/tools/kconfig/tests/inter_choice/__init__.py
@@ -0,0 +1,15 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Do not affect user-assigned choice value by another choice.
+
+Handling of state flags for choices is complecated.  In old days,
+the defconfig result of a choice could be affected by another choice
+if those choices interact by 'depends on', 'select', etc.
+
+Related Linux commit: fbe98bb9ed3dae23e320c6b113e35f129538d14a
+"""
+
+
+def test(conf):
+    assert conf.defconfig('defconfig') == 0
+    assert conf.config_contains('expected_config')
diff --git a/xen/tools/kconfig/tests/inter_choice/defconfig b/xen/tools/kconfig/tests/inter_choice/defconfig
new file mode 100644
index 000000000000..162c4148e2a5
--- /dev/null
+++ b/xen/tools/kconfig/tests/inter_choice/defconfig
@@ -0,0 +1 @@ 
+CONFIG_CHOICE_VAL0=y
diff --git a/xen/tools/kconfig/tests/inter_choice/expected_config b/xen/tools/kconfig/tests/inter_choice/expected_config
new file mode 100644
index 000000000000..5dceefb054e3
--- /dev/null
+++ b/xen/tools/kconfig/tests/inter_choice/expected_config
@@ -0,0 +1,4 @@ 
+CONFIG_MODULES=y
+CONFIG_CHOICE_VAL0=y
+# CONFIG_CHOIVE_VAL1 is not set
+CONFIG_DUMMY=y
diff --git a/xen/tools/kconfig/tests/new_choice_with_dep/Kconfig b/xen/tools/kconfig/tests/new_choice_with_dep/Kconfig
new file mode 100644
index 000000000000..127731c046b5
--- /dev/null
+++ b/xen/tools/kconfig/tests/new_choice_with_dep/Kconfig
@@ -0,0 +1,39 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config A
+	bool "A"
+	help
+	  This is a new symbol.
+
+choice
+	prompt "Choice ?"
+	depends on A
+	help
+	  "depends on A" has been newly added.
+
+config CHOICE_B
+	bool "Choice B"
+
+config CHOICE_C
+	bool "Choice C"
+	help
+	  This is a new symbol, so should be asked.
+
+endchoice
+
+choice
+	prompt "Choice2 ?"
+
+config CHOICE_D
+	bool "Choice D"
+
+config CHOICE_E
+	bool "Choice E"
+
+config CHOICE_F
+	bool "Choice F"
+	depends on A
+	help
+	  This is a new symbol, so should be asked.
+
+endchoice
diff --git a/xen/tools/kconfig/tests/new_choice_with_dep/__init__.py b/xen/tools/kconfig/tests/new_choice_with_dep/__init__.py
new file mode 100644
index 000000000000..fe9d322539c9
--- /dev/null
+++ b/xen/tools/kconfig/tests/new_choice_with_dep/__init__.py
@@ -0,0 +1,15 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Ask new choice values when they become visible.
+
+If new choice values are added with new dependency, and they become
+visible during user configuration, oldconfig should recognize them
+as (NEW), and ask the user for choice.
+
+Related Linux commit: 5d09598d488f081e3be23f885ed65cbbe2d073b5
+"""
+
+
+def test(conf):
+    assert conf.oldconfig('config', 'y') == 0
+    assert conf.stdout_contains('expected_stdout')
diff --git a/xen/tools/kconfig/tests/new_choice_with_dep/config b/xen/tools/kconfig/tests/new_choice_with_dep/config
new file mode 100644
index 000000000000..47ef95d567fd
--- /dev/null
+++ b/xen/tools/kconfig/tests/new_choice_with_dep/config
@@ -0,0 +1,3 @@ 
+CONFIG_CHOICE_B=y
+# CONFIG_CHOICE_D is not set
+CONFIG_CHOICE_E=y
diff --git a/xen/tools/kconfig/tests/new_choice_with_dep/expected_stdout b/xen/tools/kconfig/tests/new_choice_with_dep/expected_stdout
new file mode 100644
index 000000000000..74dc0bcb22bc
--- /dev/null
+++ b/xen/tools/kconfig/tests/new_choice_with_dep/expected_stdout
@@ -0,0 +1,10 @@ 
+A (A) [N/y/?] (NEW) y
+  Choice ?
+  > 1. Choice B (CHOICE_B)
+    2. Choice C (CHOICE_C) (NEW)
+  choice[1-2?]: 
+Choice2 ?
+  1. Choice D (CHOICE_D)
+> 2. Choice E (CHOICE_E)
+  3. Choice F (CHOICE_F) (NEW)
+choice[1-3?]: 
diff --git a/xen/tools/kconfig/tests/no_write_if_dep_unmet/Kconfig b/xen/tools/kconfig/tests/no_write_if_dep_unmet/Kconfig
new file mode 100644
index 000000000000..4767aab6d8e3
--- /dev/null
+++ b/xen/tools/kconfig/tests/no_write_if_dep_unmet/Kconfig
@@ -0,0 +1,16 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config A
+	bool "A"
+
+choice
+	prompt "Choice ?"
+	depends on A
+
+config CHOICE_B
+	bool "Choice B"
+
+config CHOICE_C
+	bool "Choice C"
+
+endchoice
diff --git a/xen/tools/kconfig/tests/no_write_if_dep_unmet/__init__.py b/xen/tools/kconfig/tests/no_write_if_dep_unmet/__init__.py
new file mode 100644
index 000000000000..ffd469d1f226
--- /dev/null
+++ b/xen/tools/kconfig/tests/no_write_if_dep_unmet/__init__.py
@@ -0,0 +1,20 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Do not write choice values to .config if the dependency is unmet.
+
+"# CONFIG_... is not set" should not be written into the .config file
+for symbols with unmet dependency.
+
+This was not working correctly for choice values because choice needs
+a bit different symbol computation.
+
+This checks that no unneeded "# COFIG_... is not set" is contained in
+the .config file.
+
+Related Linux commit: cb67ab2cd2b8abd9650292c986c79901e3073a59
+"""
+
+
+def test(conf):
+    assert conf.oldaskconfig('config', 'n') == 0
+    assert conf.config_matches('expected_config')
diff --git a/xen/tools/kconfig/tests/no_write_if_dep_unmet/config b/xen/tools/kconfig/tests/no_write_if_dep_unmet/config
new file mode 100644
index 000000000000..abd280e2f616
--- /dev/null
+++ b/xen/tools/kconfig/tests/no_write_if_dep_unmet/config
@@ -0,0 +1 @@ 
+CONFIG_A=y
diff --git a/xen/tools/kconfig/tests/no_write_if_dep_unmet/expected_config b/xen/tools/kconfig/tests/no_write_if_dep_unmet/expected_config
new file mode 100644
index 000000000000..473228810c35
--- /dev/null
+++ b/xen/tools/kconfig/tests/no_write_if_dep_unmet/expected_config
@@ -0,0 +1,5 @@ 
+#
+# Automatically generated file; DO NOT EDIT.
+# Main menu
+#
+# CONFIG_A is not set
diff --git a/xen/tools/kconfig/tests/preprocess/builtin_func/Kconfig b/xen/tools/kconfig/tests/preprocess/builtin_func/Kconfig
new file mode 100644
index 000000000000..baa328827911
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/builtin_func/Kconfig
@@ -0,0 +1,27 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+# 'info' prints the argument to stdout.
+$(info,hello world 0)
+
+# 'warning-if', if the first argument is y, sends the second argument to stderr,
+# and the message is prefixed with the current file name and line number.
+$(warning-if,y,hello world 1)
+
+# 'error-if' is similar, but it terminates the parsing immediately.
+# The following is just no-op since the first argument is not y.
+$(error-if,n,this should not be printed)
+
+# Shorthand
+warning = $(warning-if,y,$(1))
+
+# 'shell' executes a command, and returns its stdout.
+$(warning,$(shell,echo hello world 3))
+
+# Every newline in the output is replaced with a space,
+# but any trailing newlines are deleted.
+$(warning,$(shell,printf 'hello\nworld\n\n4\n\n\n'))
+
+# 'filename' is expanded to the currently parsed file name,
+# 'lineno' to the line number.
+$(warning,filename=$(filename))
+$(warning,lineno=$(lineno))
diff --git a/xen/tools/kconfig/tests/preprocess/builtin_func/__init__.py b/xen/tools/kconfig/tests/preprocess/builtin_func/__init__.py
new file mode 100644
index 000000000000..2e53ba08fca1
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/builtin_func/__init__.py
@@ -0,0 +1,9 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Built-in function tests.
+"""
+
+def test(conf):
+    assert conf.oldaskconfig() == 0
+    assert conf.stdout_contains('expected_stdout')
+    assert conf.stderr_matches('expected_stderr')
diff --git a/xen/tools/kconfig/tests/preprocess/builtin_func/expected_stderr b/xen/tools/kconfig/tests/preprocess/builtin_func/expected_stderr
new file mode 100644
index 000000000000..33ea9ca38400
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/builtin_func/expected_stderr
@@ -0,0 +1,5 @@ 
+Kconfig:8: hello world 1
+Kconfig:18: hello world 3
+Kconfig:22: hello world  4
+Kconfig:26: filename=Kconfig
+Kconfig:27: lineno=27
diff --git a/xen/tools/kconfig/tests/preprocess/builtin_func/expected_stdout b/xen/tools/kconfig/tests/preprocess/builtin_func/expected_stdout
new file mode 100644
index 000000000000..82de3a7e97de
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/builtin_func/expected_stdout
@@ -0,0 +1 @@ 
+hello world 0
diff --git a/xen/tools/kconfig/tests/preprocess/circular_expansion/Kconfig b/xen/tools/kconfig/tests/preprocess/circular_expansion/Kconfig
new file mode 100644
index 000000000000..6838997c23ba
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/circular_expansion/Kconfig
@@ -0,0 +1,5 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+X = $(Y)
+Y = $(X)
+$(info $(X))
diff --git a/xen/tools/kconfig/tests/preprocess/circular_expansion/__init__.py b/xen/tools/kconfig/tests/preprocess/circular_expansion/__init__.py
new file mode 100644
index 000000000000..419bda3e075c
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/circular_expansion/__init__.py
@@ -0,0 +1,11 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Detect circular variable expansion.
+
+If a recursively expanded variable references itself (eventually),
+it should fail with an error message.
+"""
+
+def test(conf):
+    assert conf.oldaskconfig() != 0
+    assert conf.stderr_matches('expected_stderr')
diff --git a/xen/tools/kconfig/tests/preprocess/circular_expansion/expected_stderr b/xen/tools/kconfig/tests/preprocess/circular_expansion/expected_stderr
new file mode 100644
index 000000000000..cde68fa989d0
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/circular_expansion/expected_stderr
@@ -0,0 +1 @@ 
+Kconfig:5: Recursive variable 'X' references itself (eventually)
diff --git a/xen/tools/kconfig/tests/preprocess/escape/Kconfig b/xen/tools/kconfig/tests/preprocess/escape/Kconfig
new file mode 100644
index 000000000000..4e3f44445544
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/escape/Kconfig
@@ -0,0 +1,44 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+# Shorthand
+warning = $(warning-if,y,$(1))
+
+# You can not pass commas directly to a function since they are treated as
+# delimiters. You can use the following trick to do so.
+comma   := ,
+$(warning,hello$(comma) world)
+
+# Like Make, single quotes, double quotes, spaces are treated verbatim.
+# The following prints the text as-is.
+$(warning,  ' " '"   ' ''' "'")
+
+# Unlike Make, '$' has special meaning only when it is followed by '('.
+# No need to escape '$' itself.
+$(warning,$)
+$(warning,$$)
+$ := 1
+$(warning,$($))
+
+# You need a trick to escape '$' followed by '('
+# The following should print "$(X)". It should not be expanded further.
+dollar := $
+$(warning,$(dollar)(X))
+
+# You need a trick to treat unbalanced parentheses.
+# The following should print "(".
+left_paren := (
+$(warning,$(left_paren))
+
+# A simple expanded should not be expanded multiple times.
+# The following should print "$(X)". It should not be expanded further.
+Y := $(dollar)(X)
+$(warning,$(Y))
+
+# The following should print "$(X)" as well.
+Y = $(dollar)(X)
+$(warning,$(Y))
+
+# The following should print "$(".
+# It should not be emit "unterminated reference" error.
+unterminated := $(dollar)(
+$(warning,$(unterminated))
diff --git a/xen/tools/kconfig/tests/preprocess/escape/__init__.py b/xen/tools/kconfig/tests/preprocess/escape/__init__.py
new file mode 100644
index 000000000000..7ee8e747f546
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/escape/__init__.py
@@ -0,0 +1,8 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Escape sequence tests.
+"""
+
+def test(conf):
+    assert conf.oldaskconfig() == 0
+    assert conf.stderr_matches('expected_stderr')
diff --git a/xen/tools/kconfig/tests/preprocess/escape/expected_stderr b/xen/tools/kconfig/tests/preprocess/escape/expected_stderr
new file mode 100644
index 000000000000..1c00957ddaa9
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/escape/expected_stderr
@@ -0,0 +1,10 @@ 
+Kconfig:9: hello, world
+Kconfig:13:   ' " '"   ' ''' "'"
+Kconfig:17: $
+Kconfig:18: $$
+Kconfig:20: 1
+Kconfig:25: $(X)
+Kconfig:30: (
+Kconfig:35: $(X)
+Kconfig:39: $(X)
+Kconfig:44: $(
diff --git a/xen/tools/kconfig/tests/preprocess/variable/Kconfig b/xen/tools/kconfig/tests/preprocess/variable/Kconfig
new file mode 100644
index 000000000000..9ce2f95cbd24
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/variable/Kconfig
@@ -0,0 +1,53 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+# Shorthand
+warning = $(warning-if,y,$(1))
+
+# Simply expanded variable.
+X := 1
+SIMPLE := $(X)
+X := 2
+$(warning,SIMPLE = $(SIMPLE))
+
+# Recursively expanded variable.
+X := 1
+RECURSIVE = $(X)
+X := 2
+$(warning,RECURSIVE = $(RECURSIVE))
+
+# Append something to a simply expanded variable.
+Y := 3
+SIMPLE += $(Y)
+Y := 4
+$(warning,SIMPLE = $(SIMPLE))
+
+# Append something to a recursively expanded variable.
+Y := 3
+RECURSIVE += $(Y)
+Y := 4
+$(warning,RECURSIVE = $(RECURSIVE))
+
+# Use += operator to an undefined variable.
+# This works as a recursively expanded variable.
+Y := 3
+UNDEFINED_VARIABLE += $(Y)
+Y := 4
+$(warning,UNDEFINED_VARIABLE = $(UNDEFINED_VARIABLE))
+
+# You can use variable references for the lefthand side of assignment statement.
+X := A
+Y := B
+$(X)$(Y) := 5
+$(warning,AB = $(AB))
+
+# User-defined function.
+greeting = $(1), my name is $(2).
+$(warning,$(greeting,Hello,John))
+
+# The number of arguments is not checked for user-defined functions.
+# If some arguments are optional, it is useful to pass fewer parameters.
+# $(2) will be blank in this case.
+$(warning,$(greeting,Hello))
+
+# Unreferenced parameters are just ignored.
+$(warning,$(greeting,Hello,John,ignored,ignored))
diff --git a/xen/tools/kconfig/tests/preprocess/variable/__init__.py b/xen/tools/kconfig/tests/preprocess/variable/__init__.py
new file mode 100644
index 000000000000..e88b1708d6d4
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/variable/__init__.py
@@ -0,0 +1,8 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Variable and user-defined function tests.
+"""
+
+def test(conf):
+    assert conf.oldaskconfig() == 0
+    assert conf.stderr_matches('expected_stderr')
diff --git a/xen/tools/kconfig/tests/preprocess/variable/expected_stderr b/xen/tools/kconfig/tests/preprocess/variable/expected_stderr
new file mode 100644
index 000000000000..a4841c3fdff5
--- /dev/null
+++ b/xen/tools/kconfig/tests/preprocess/variable/expected_stderr
@@ -0,0 +1,9 @@ 
+Kconfig:10: SIMPLE = 1
+Kconfig:16: RECURSIVE = 2
+Kconfig:22: SIMPLE = 1 3
+Kconfig:28: RECURSIVE = 2 4
+Kconfig:35: UNDEFINED_VARIABLE = 4
+Kconfig:41: AB = 5
+Kconfig:45: Hello, my name is John.
+Kconfig:50: Hello, my name is .
+Kconfig:53: Hello, my name is John.
diff --git a/xen/tools/kconfig/tests/pytest.ini b/xen/tools/kconfig/tests/pytest.ini
new file mode 100644
index 000000000000..85d7ce8e448b
--- /dev/null
+++ b/xen/tools/kconfig/tests/pytest.ini
@@ -0,0 +1,7 @@ 
+[pytest]
+addopts = --verbose
+
+# Pytest requires that test files have unique names, because pytest imports
+# them as top-level modules.  It is silly to prefix or suffix a test file with
+# the directory name that contains it.  Use __init__.py for all test files.
+python_files = __init__.py
diff --git a/xen/tools/kconfig/tests/rand_nested_choice/Kconfig b/xen/tools/kconfig/tests/rand_nested_choice/Kconfig
new file mode 100644
index 000000000000..8350de7f732b
--- /dev/null
+++ b/xen/tools/kconfig/tests/rand_nested_choice/Kconfig
@@ -0,0 +1,35 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+choice
+	prompt "choice"
+
+config A
+	bool "A"
+
+config B
+	bool "B"
+
+if B
+choice
+	prompt "sub choice"
+
+config C
+	bool "C"
+
+config D
+	bool "D"
+
+if D
+choice
+	prompt "subsub choice"
+
+config E
+	bool "E"
+
+endchoice
+endif # D
+
+endchoice
+endif # B
+
+endchoice
diff --git a/xen/tools/kconfig/tests/rand_nested_choice/__init__.py b/xen/tools/kconfig/tests/rand_nested_choice/__init__.py
new file mode 100644
index 000000000000..9e4b2db53581
--- /dev/null
+++ b/xen/tools/kconfig/tests/rand_nested_choice/__init__.py
@@ -0,0 +1,17 @@ 
+# SPDX-License-Identifier: GPL-2.0
+"""
+Set random values recursively in nested choices.
+
+Kconfig can create a choice-in-choice structure by using 'if' statement.
+randconfig should correctly set random choice values.
+
+Related Linux commit: 3b9a19e08960e5cdad5253998637653e592a3c29
+"""
+
+
+def test(conf):
+    for i in range(20):
+        assert conf.randconfig() == 0
+        assert (conf.config_contains('expected_stdout0') or
+                conf.config_contains('expected_stdout1') or
+                conf.config_contains('expected_stdout2'))
diff --git a/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout0 b/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout0
new file mode 100644
index 000000000000..05450f3d4eb5
--- /dev/null
+++ b/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout0
@@ -0,0 +1,2 @@ 
+CONFIG_A=y
+# CONFIG_B is not set
diff --git a/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout1 b/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout1
new file mode 100644
index 000000000000..37ab29584157
--- /dev/null
+++ b/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout1
@@ -0,0 +1,4 @@ 
+# CONFIG_A is not set
+CONFIG_B=y
+CONFIG_C=y
+# CONFIG_D is not set
diff --git a/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout2 b/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout2
new file mode 100644
index 000000000000..849ff47e9848
--- /dev/null
+++ b/xen/tools/kconfig/tests/rand_nested_choice/expected_stdout2
@@ -0,0 +1,5 @@ 
+# CONFIG_A is not set
+CONFIG_B=y
+# CONFIG_C is not set
+CONFIG_D=y
+CONFIG_E=y
diff --git a/xen/tools/kconfig/util.c b/xen/tools/kconfig/util.c
index 0e76042473cc..29585394df71 100644
--- a/xen/tools/kconfig/util.c
+++ b/xen/tools/kconfig/util.c
@@ -1,8 +1,7 @@ 
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
  * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
- *
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <stdarg.h>
@@ -14,69 +13,21 @@ 
 struct file *file_lookup(const char *name)
 {
 	struct file *file;
-	const char *file_name = sym_expand_string_value(name);
 
 	for (file = file_list; file; file = file->next) {
 		if (!strcmp(name, file->name)) {
-			free((void *)file_name);
 			return file;
 		}
 	}
 
 	file = xmalloc(sizeof(*file));
 	memset(file, 0, sizeof(*file));
-	file->name = file_name;
+	file->name = xstrdup(name);
 	file->next = file_list;
 	file_list = file;
 	return file;
 }
 
-/* write a dependency file as used by kbuild to track dependencies */
-int file_write_dep(const char *name)
-{
-	struct symbol *sym, *env_sym;
-	struct expr *e;
-	struct file *file;
-	FILE *out;
-
-	if (!name)
-		name = ".kconfig.d";
-	out = fopen("..config.tmp", "w");
-	if (!out)
-		return 1;
-	fprintf(out, "deps_config := \\\n");
-	for (file = file_list; file; file = file->next) {
-		if (file->next)
-			fprintf(out, "\t%s \\\n", file->name);
-		else
-			fprintf(out, "\t%s\n", file->name);
-	}
-	fprintf(out, "\n%s: \\\n"
-		     "\t$(deps_config)\n\n", conf_get_autoconfig_name());
-
-	expr_list_for_each_sym(sym_env_list, e, sym) {
-		struct property *prop;
-		const char *value;
-
-		prop = sym_get_env_prop(sym);
-		env_sym = prop_get_symbol(prop);
-		if (!env_sym)
-			continue;
-		value = getenv(env_sym->name);
-		if (!value)
-			value = "";
-		fprintf(out, "ifneq \"$(%s)\" \"%s\"\n", env_sym->name, value);
-		fprintf(out, "%s: FORCE\n", conf_get_autoconfig_name());
-		fprintf(out, "endif\n");
-	}
-
-	fprintf(out, "\n$(deps_config): ;\n");
-	fclose(out);
-	rename("..config.tmp", name);
-	return 0;
-}
-
-
 /* Allocate initial growable string */
 struct gstr str_new(void)
 {
@@ -104,7 +55,7 @@  void str_append(struct gstr *gs, const char *s)
 	if (s) {
 		l = strlen(gs->s) + strlen(s) + 1;
 		if (l > gs->len) {
-			gs->s   = realloc(gs->s, l);
+			gs->s = xrealloc(gs->s, l);
 			gs->len = l;
 		}
 		strcat(gs->s, s);
@@ -145,3 +96,34 @@  void *xcalloc(size_t nmemb, size_t size)
 	fprintf(stderr, "Out of memory.\n");
 	exit(1);
 }
+
+void *xrealloc(void *p, size_t size)
+{
+	p = realloc(p, size);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}
+
+char *xstrdup(const char *s)
+{
+	char *p;
+
+	p = strdup(s);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}
+
+char *xstrndup(const char *s, size_t n)
+{
+	char *p;
+
+	p = strndup(s, n);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}
diff --git a/xen/tools/kconfig/zconf.gperf b/xen/tools/kconfig/zconf.gperf
deleted file mode 100644
index ac498f01b449..000000000000
--- a/xen/tools/kconfig/zconf.gperf
+++ /dev/null
@@ -1,49 +0,0 @@ 
-%language=ANSI-C
-%define hash-function-name kconf_id_hash
-%define lookup-function-name kconf_id_lookup
-%define string-pool-name kconf_id_strings
-%compare-strncmp
-%enum
-%pic
-%struct-type
-
-struct kconf_id;
-
-static const struct kconf_id *kconf_id_lookup(register const char *str, register unsigned int len);
-
-%%
-mainmenu,	T_MAINMENU,	TF_COMMAND
-menu,		T_MENU,		TF_COMMAND
-endmenu,	T_ENDMENU,	TF_COMMAND
-source,		T_SOURCE,	TF_COMMAND
-choice,		T_CHOICE,	TF_COMMAND
-endchoice,	T_ENDCHOICE,	TF_COMMAND
-comment,	T_COMMENT,	TF_COMMAND
-config,		T_CONFIG,	TF_COMMAND
-menuconfig,	T_MENUCONFIG,	TF_COMMAND
-help,		T_HELP,		TF_COMMAND
----help---,	T_HELP,		TF_COMMAND
-if,		T_IF,		TF_COMMAND|TF_PARAM
-endif,		T_ENDIF,	TF_COMMAND
-depends,	T_DEPENDS,	TF_COMMAND
-optional,	T_OPTIONAL,	TF_COMMAND
-default,	T_DEFAULT,	TF_COMMAND, S_UNKNOWN
-prompt,		T_PROMPT,	TF_COMMAND
-tristate,	T_TYPE,		TF_COMMAND, S_TRISTATE
-def_tristate,	T_DEFAULT,	TF_COMMAND, S_TRISTATE
-bool,		T_TYPE,		TF_COMMAND, S_BOOLEAN
-boolean,	T_TYPE,		TF_COMMAND, S_BOOLEAN
-def_bool,	T_DEFAULT,	TF_COMMAND, S_BOOLEAN
-int,		T_TYPE,		TF_COMMAND, S_INT
-hex,		T_TYPE,		TF_COMMAND, S_HEX
-string,		T_TYPE,		TF_COMMAND, S_STRING
-select,		T_SELECT,	TF_COMMAND
-range,		T_RANGE,	TF_COMMAND
-visible,	T_VISIBLE,	TF_COMMAND
-option,		T_OPTION,	TF_COMMAND
-on,		T_ON,		TF_PARAM
-modules,	T_OPT_MODULES,	TF_OPTION
-defconfig_list,	T_OPT_DEFCONFIG_LIST,TF_OPTION
-env,		T_OPT_ENV,	TF_OPTION
-allnoconfig_y,	T_OPT_ALLNOCONFIG_Y,TF_OPTION
-%%
diff --git a/xen/tools/kconfig/zconf.hash.c_shipped b/xen/tools/kconfig/zconf.hash.c_shipped
deleted file mode 100644
index 360a62df2b5e..000000000000
--- a/xen/tools/kconfig/zconf.hash.c_shipped
+++ /dev/null
@@ -1,293 +0,0 @@ 
-/* ANSI-C code produced by gperf version 3.0.4 */
-/* Command-line: gperf -t --output-file scripts/kconfig/zconf.hash.c_shipped -a -C -E -g -k '1,3,$' -p -t scripts/kconfig/zconf.gperf  */
-
-#if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
-      && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
-      && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
-      && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
-      && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
-      && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
-      && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
-      && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
-      && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
-      && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
-      && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
-      && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
-      && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
-      && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
-      && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
-      && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
-      && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
-      && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
-      && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
-      && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
-      && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
-      && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
-      && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126))
-/* The character set is not based on ISO-646.  */
-#error "gperf generated tables don't work with this execution character set. Please report a bug to <bug-gnu-gperf@gnu.org>."
-#endif
-
-#line 10 "scripts/kconfig/zconf.gperf"
-struct kconf_id;
-
-static const struct kconf_id *kconf_id_lookup(register const char *str, register unsigned int len);
-/* maximum key range = 71, duplicates = 0 */
-
-#ifdef __GNUC__
-__inline
-#else
-#ifdef __cplusplus
-inline
-#endif
-#endif
-static unsigned int
-kconf_id_hash (register const char *str, register unsigned int len)
-{
-  static const unsigned char asso_values[] =
-    {
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73,  0, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73,  5, 25, 25,
-       0,  0,  0,  5,  0,  0, 73, 73,  5,  0,
-      10,  5, 45, 73, 20, 20,  0, 15, 15, 73,
-      20,  5, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
-      73, 73, 73, 73, 73, 73
-    };
-  register int hval = len;
-
-  switch (hval)
-    {
-      default:
-        hval += asso_values[(unsigned char)str[2]];
-      /*FALLTHROUGH*/
-      case 2:
-      case 1:
-        hval += asso_values[(unsigned char)str[0]];
-        break;
-    }
-  return hval + asso_values[(unsigned char)str[len - 1]];
-}
-
-struct kconf_id_strings_t
-  {
-    char kconf_id_strings_str2[sizeof("if")];
-    char kconf_id_strings_str3[sizeof("int")];
-    char kconf_id_strings_str5[sizeof("endif")];
-    char kconf_id_strings_str7[sizeof("default")];
-    char kconf_id_strings_str8[sizeof("tristate")];
-    char kconf_id_strings_str9[sizeof("endchoice")];
-    char kconf_id_strings_str10[sizeof("---help---")];
-    char kconf_id_strings_str12[sizeof("def_tristate")];
-    char kconf_id_strings_str13[sizeof("def_bool")];
-    char kconf_id_strings_str14[sizeof("defconfig_list")];
-    char kconf_id_strings_str17[sizeof("on")];
-    char kconf_id_strings_str18[sizeof("optional")];
-    char kconf_id_strings_str21[sizeof("option")];
-    char kconf_id_strings_str22[sizeof("endmenu")];
-    char kconf_id_strings_str23[sizeof("mainmenu")];
-    char kconf_id_strings_str25[sizeof("menuconfig")];
-    char kconf_id_strings_str27[sizeof("modules")];
-    char kconf_id_strings_str28[sizeof("allnoconfig_y")];
-    char kconf_id_strings_str29[sizeof("menu")];
-    char kconf_id_strings_str31[sizeof("select")];
-    char kconf_id_strings_str32[sizeof("comment")];
-    char kconf_id_strings_str33[sizeof("env")];
-    char kconf_id_strings_str35[sizeof("range")];
-    char kconf_id_strings_str36[sizeof("choice")];
-    char kconf_id_strings_str39[sizeof("bool")];
-    char kconf_id_strings_str41[sizeof("source")];
-    char kconf_id_strings_str42[sizeof("visible")];
-    char kconf_id_strings_str43[sizeof("hex")];
-    char kconf_id_strings_str46[sizeof("config")];
-    char kconf_id_strings_str47[sizeof("boolean")];
-    char kconf_id_strings_str51[sizeof("string")];
-    char kconf_id_strings_str54[sizeof("help")];
-    char kconf_id_strings_str56[sizeof("prompt")];
-    char kconf_id_strings_str72[sizeof("depends")];
-  };
-static const struct kconf_id_strings_t kconf_id_strings_contents =
-  {
-    "if",
-    "int",
-    "endif",
-    "default",
-    "tristate",
-    "endchoice",
-    "---help---",
-    "def_tristate",
-    "def_bool",
-    "defconfig_list",
-    "on",
-    "optional",
-    "option",
-    "endmenu",
-    "mainmenu",
-    "menuconfig",
-    "modules",
-    "allnoconfig_y",
-    "menu",
-    "select",
-    "comment",
-    "env",
-    "range",
-    "choice",
-    "bool",
-    "source",
-    "visible",
-    "hex",
-    "config",
-    "boolean",
-    "string",
-    "help",
-    "prompt",
-    "depends"
-  };
-#define kconf_id_strings ((const char *) &kconf_id_strings_contents)
-#ifdef __GNUC__
-__inline
-#if defined __GNUC_STDC_INLINE__ || defined __GNUC_GNU_INLINE__
-__attribute__ ((__gnu_inline__))
-#endif
-#endif
-const struct kconf_id *
-kconf_id_lookup (register const char *str, register unsigned int len)
-{
-  enum
-    {
-      TOTAL_KEYWORDS = 34,
-      MIN_WORD_LENGTH = 2,
-      MAX_WORD_LENGTH = 14,
-      MIN_HASH_VALUE = 2,
-      MAX_HASH_VALUE = 72
-    };
-
-  static const struct kconf_id wordlist[] =
-    {
-      {-1}, {-1},
-#line 26 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str2,		T_IF,		TF_COMMAND|TF_PARAM},
-#line 37 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str3,		T_TYPE,		TF_COMMAND, S_INT},
-      {-1},
-#line 27 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str5,		T_ENDIF,	TF_COMMAND},
-      {-1},
-#line 30 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str7,	T_DEFAULT,	TF_COMMAND, S_UNKNOWN},
-#line 32 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str8,	T_TYPE,		TF_COMMAND, S_TRISTATE},
-#line 20 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str9,	T_ENDCHOICE,	TF_COMMAND},
-#line 25 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str10,	T_HELP,		TF_COMMAND},
-      {-1},
-#line 33 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str12,	T_DEFAULT,	TF_COMMAND, S_TRISTATE},
-#line 36 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str13,	T_DEFAULT,	TF_COMMAND, S_BOOLEAN},
-#line 46 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str14,	T_OPT_DEFCONFIG_LIST,TF_OPTION},
-      {-1}, {-1},
-#line 44 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str17,		T_ON,		TF_PARAM},
-#line 29 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str18,	T_OPTIONAL,	TF_COMMAND},
-      {-1}, {-1},
-#line 43 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str21,		T_OPTION,	TF_COMMAND},
-#line 17 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str22,	T_ENDMENU,	TF_COMMAND},
-#line 15 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str23,	T_MAINMENU,	TF_COMMAND},
-      {-1},
-#line 23 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str25,	T_MENUCONFIG,	TF_COMMAND},
-      {-1},
-#line 45 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str27,	T_OPT_MODULES,	TF_OPTION},
-#line 48 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str28,	T_OPT_ALLNOCONFIG_Y,TF_OPTION},
-#line 16 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str29,		T_MENU,		TF_COMMAND},
-      {-1},
-#line 40 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str31,		T_SELECT,	TF_COMMAND},
-#line 21 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str32,	T_COMMENT,	TF_COMMAND},
-#line 47 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str33,		T_OPT_ENV,	TF_OPTION},
-      {-1},
-#line 41 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str35,		T_RANGE,	TF_COMMAND},
-#line 19 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str36,		T_CHOICE,	TF_COMMAND},
-      {-1}, {-1},
-#line 34 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str39,		T_TYPE,		TF_COMMAND, S_BOOLEAN},
-      {-1},
-#line 18 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str41,		T_SOURCE,	TF_COMMAND},
-#line 42 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str42,	T_VISIBLE,	TF_COMMAND},
-#line 38 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str43,		T_TYPE,		TF_COMMAND, S_HEX},
-      {-1}, {-1},
-#line 22 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str46,		T_CONFIG,	TF_COMMAND},
-#line 35 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str47,	T_TYPE,		TF_COMMAND, S_BOOLEAN},
-      {-1}, {-1}, {-1},
-#line 39 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str51,		T_TYPE,		TF_COMMAND, S_STRING},
-      {-1}, {-1},
-#line 24 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str54,		T_HELP,		TF_COMMAND},
-      {-1},
-#line 31 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str56,		T_PROMPT,	TF_COMMAND},
-      {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1},
-      {-1}, {-1}, {-1}, {-1}, {-1}, {-1},
-#line 28 "scripts/kconfig/zconf.gperf"
-      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str72,	T_DEPENDS,	TF_COMMAND}
-    };
-
-  if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
-    {
-      register int key = kconf_id_hash (str, len);
-
-      if (key <= MAX_HASH_VALUE && key >= 0)
-        {
-          register int o = wordlist[key].name;
-          if (o >= 0)
-            {
-              register const char *s = o + kconf_id_strings;
-
-              if (*str == *s && !strncmp (str + 1, s + 1, len - 1) && s[len] == '\0')
-                return &wordlist[key];
-            }
-        }
-    }
-  return 0;
-}
-#line 49 "scripts/kconfig/zconf.gperf"
-
diff --git a/xen/tools/kconfig/zconf.l b/xen/tools/kconfig/zconf.l
deleted file mode 100644
index c410d257da06..000000000000
--- a/xen/tools/kconfig/zconf.l
+++ /dev/null
@@ -1,374 +0,0 @@ 
-%option nostdinit noyywrap never-interactive full ecs
-%option 8bit nodefault perf-report perf-report
-%option noinput
-%x COMMAND HELP STRING PARAM
-%{
-/*
- * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
- */
-
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "lkc.h"
-
-#define START_STRSIZE	16
-
-static struct {
-	struct file *file;
-	int lineno;
-} current_pos;
-
-static char *text;
-static int text_size, text_asize;
-
-struct buffer {
-	struct buffer *parent;
-	YY_BUFFER_STATE state;
-};
-
-struct buffer *current_buf;
-
-static int last_ts, first_ts;
-
-static void zconf_endhelp(void);
-static void zconf_endfile(void);
-
-static void new_string(void)
-{
-	text = xmalloc(START_STRSIZE);
-	text_asize = START_STRSIZE;
-	text_size = 0;
-	*text = 0;
-}
-
-static void append_string(const char *str, int size)
-{
-	int new_size = text_size + size + 1;
-	if (new_size > text_asize) {
-		new_size += START_STRSIZE - 1;
-		new_size &= -START_STRSIZE;
-		text = realloc(text, new_size);
-		text_asize = new_size;
-	}
-	memcpy(text + text_size, str, size);
-	text_size += size;
-	text[text_size] = 0;
-}
-
-static void alloc_string(const char *str, int size)
-{
-	text = xmalloc(size + 1);
-	memcpy(text, str, size);
-	text[size] = 0;
-}
-
-static void warn_ignored_character(char chr)
-{
-	fprintf(stderr,
-	        "%s:%d:warning: ignoring unsupported character '%c'\n",
-	        zconf_curname(), zconf_lineno(), chr);
-}
-%}
-
-n	[A-Za-z0-9_-]
-
-%%
-	int str = 0;
-	int ts, i;
-
-[ \t]*#.*\n	|
-[ \t]*\n	{
-	current_file->lineno++;
-	return T_EOL;
-}
-[ \t]*#.*
-
-
-[ \t]+	{
-	BEGIN(COMMAND);
-}
-
-.	{
-	unput(yytext[0]);
-	BEGIN(COMMAND);
-}
-
-
-<COMMAND>{
-	{n}+	{
-		const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
-		BEGIN(PARAM);
-		current_pos.file = current_file;
-		current_pos.lineno = current_file->lineno;
-		if (id && id->flags & TF_COMMAND) {
-			zconflval.id = id;
-			return id->token;
-		}
-		alloc_string(yytext, yyleng);
-		zconflval.string = text;
-		return T_WORD;
-	}
-	.	warn_ignored_character(*yytext);
-	\n	{
-		BEGIN(INITIAL);
-		current_file->lineno++;
-		return T_EOL;
-	}
-}
-
-<PARAM>{
-	"&&"	return T_AND;
-	"||"	return T_OR;
-	"("	return T_OPEN_PAREN;
-	")"	return T_CLOSE_PAREN;
-	"!"	return T_NOT;
-	"="	return T_EQUAL;
-	"!="	return T_UNEQUAL;
-	"<="	return T_LESS_EQUAL;
-	">="	return T_GREATER_EQUAL;
-	"<"	return T_LESS;
-	">"	return T_GREATER;
-	\"|\'	{
-		str = yytext[0];
-		new_string();
-		BEGIN(STRING);
-	}
-	\n	BEGIN(INITIAL); current_file->lineno++; return T_EOL;
-	({n}|[/.])+	{
-		const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
-		if (id && id->flags & TF_PARAM) {
-			zconflval.id = id;
-			return id->token;
-		}
-		alloc_string(yytext, yyleng);
-		zconflval.string = text;
-		return T_WORD;
-	}
-	#.*	/* comment */
-	\\\n	current_file->lineno++;
-	[[:blank:]]+
-	.	warn_ignored_character(*yytext);
-	<<EOF>> {
-		BEGIN(INITIAL);
-	}
-}
-
-<STRING>{
-	[^'"\\\n]+/\n	{
-		append_string(yytext, yyleng);
-		zconflval.string = text;
-		return T_WORD_QUOTE;
-	}
-	[^'"\\\n]+	{
-		append_string(yytext, yyleng);
-	}
-	\\.?/\n	{
-		append_string(yytext + 1, yyleng - 1);
-		zconflval.string = text;
-		return T_WORD_QUOTE;
-	}
-	\\.?	{
-		append_string(yytext + 1, yyleng - 1);
-	}
-	\'|\"	{
-		if (str == yytext[0]) {
-			BEGIN(PARAM);
-			zconflval.string = text;
-			return T_WORD_QUOTE;
-		} else
-			append_string(yytext, 1);
-	}
-	\n	{
-		printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
-		current_file->lineno++;
-		BEGIN(INITIAL);
-		return T_EOL;
-	}
-	<<EOF>>	{
-		BEGIN(INITIAL);
-	}
-}
-
-<HELP>{
-	[ \t]+	{
-		ts = 0;
-		for (i = 0; i < yyleng; i++) {
-			if (yytext[i] == '\t')
-				ts = (ts & ~7) + 8;
-			else
-				ts++;
-		}
-		last_ts = ts;
-		if (first_ts) {
-			if (ts < first_ts) {
-				zconf_endhelp();
-				return T_HELPTEXT;
-			}
-			ts -= first_ts;
-			while (ts > 8) {
-				append_string("        ", 8);
-				ts -= 8;
-			}
-			append_string("        ", ts);
-		}
-	}
-	[ \t]*\n/[^ \t\n] {
-		current_file->lineno++;
-		zconf_endhelp();
-		return T_HELPTEXT;
-	}
-	[ \t]*\n	{
-		current_file->lineno++;
-		append_string("\n", 1);
-	}
-	[^ \t\n].* {
-		while (yyleng) {
-			if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
-				break;
-			yyleng--;
-		}
-		append_string(yytext, yyleng);
-		if (!first_ts)
-			first_ts = last_ts;
-	}
-	<<EOF>>	{
-		zconf_endhelp();
-		return T_HELPTEXT;
-	}
-}
-
-<<EOF>>	{
-	if (current_file) {
-		zconf_endfile();
-		return T_EOL;
-	}
-	fclose(yyin);
-	yyterminate();
-}
-
-%%
-void zconf_starthelp(void)
-{
-	new_string();
-	last_ts = first_ts = 0;
-	BEGIN(HELP);
-}
-
-static void zconf_endhelp(void)
-{
-	zconflval.string = text;
-	BEGIN(INITIAL);
-}
-
-
-/*
- * Try to open specified file with following names:
- * ./name
- * $(srctree)/name
- * The latter is used when srctree is separate from objtree
- * when compiling the kernel.
- * Return NULL if file is not found.
- */
-FILE *zconf_fopen(const char *name)
-{
-	char *env, fullname[PATH_MAX+1];
-	FILE *f;
-
-	f = fopen(name, "r");
-	if (!f && name != NULL && name[0] != '/') {
-		env = getenv(SRCTREE);
-		if (env) {
-			sprintf(fullname, "%s/%s", env, name);
-			f = fopen(fullname, "r");
-		}
-	}
-	return f;
-}
-
-void zconf_initscan(const char *name)
-{
-	yyin = zconf_fopen(name);
-	if (!yyin) {
-		printf("can't find file %s\n", name);
-		exit(1);
-	}
-
-	current_buf = xmalloc(sizeof(*current_buf));
-	memset(current_buf, 0, sizeof(*current_buf));
-
-	current_file = file_lookup(name);
-	current_file->lineno = 1;
-}
-
-void zconf_nextfile(const char *name)
-{
-	struct file *iter;
-	struct file *file = file_lookup(name);
-	struct buffer *buf = xmalloc(sizeof(*buf));
-	memset(buf, 0, sizeof(*buf));
-
-	current_buf->state = YY_CURRENT_BUFFER;
-	yyin = zconf_fopen(file->name);
-	if (!yyin) {
-		printf("%s:%d: can't open file \"%s\"\n",
-		    zconf_curname(), zconf_lineno(), file->name);
-		exit(1);
-	}
-	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
-	buf->parent = current_buf;
-	current_buf = buf;
-
-	for (iter = current_file->parent; iter; iter = iter->parent ) {
-		if (!strcmp(current_file->name,iter->name) ) {
-			printf("%s:%d: recursive inclusion detected. "
-			       "Inclusion path:\n  current file : '%s'\n",
-			       zconf_curname(), zconf_lineno(),
-			       zconf_curname());
-			iter = current_file->parent;
-			while (iter && \
-			       strcmp(iter->name,current_file->name)) {
-				printf("  included from: '%s:%d'\n",
-				       iter->name, iter->lineno-1);
-				iter = iter->parent;
-			}
-			if (iter)
-				printf("  included from: '%s:%d'\n",
-				       iter->name, iter->lineno+1);
-			exit(1);
-		}
-	}
-	file->lineno = 1;
-	file->parent = current_file;
-	current_file = file;
-}
-
-static void zconf_endfile(void)
-{
-	struct buffer *parent;
-
-	current_file = current_file->parent;
-
-	parent = current_buf->parent;
-	if (parent) {
-		fclose(yyin);
-		yy_delete_buffer(YY_CURRENT_BUFFER);
-		yy_switch_to_buffer(parent->state);
-	}
-	free(current_buf);
-	current_buf = parent;
-}
-
-int zconf_lineno(void)
-{
-	return current_pos.lineno;
-}
-
-const char *zconf_curname(void)
-{
-	return current_pos.file ? current_pos.file->name : "<none>";
-}
diff --git a/xen/tools/kconfig/zconf.lex.c_shipped b/xen/tools/kconfig/zconf.lex.c_shipped
deleted file mode 100644
index 37fdf6123505..000000000000
--- a/xen/tools/kconfig/zconf.lex.c_shipped
+++ /dev/null
@@ -1,2473 +0,0 @@ 
-
-#line 3 "scripts/kconfig/zconf.lex.c_shipped"
-
-#define  YY_INT_ALIGNED short int
-
-/* A lexical scanner generated by flex */
-
-#define yy_create_buffer zconf_create_buffer
-#define yy_delete_buffer zconf_delete_buffer
-#define yy_flex_debug zconf_flex_debug
-#define yy_init_buffer zconf_init_buffer
-#define yy_flush_buffer zconf_flush_buffer
-#define yy_load_buffer_state zconf_load_buffer_state
-#define yy_switch_to_buffer zconf_switch_to_buffer
-#define yyin zconfin
-#define yyleng zconfleng
-#define yylex zconflex
-#define yylineno zconflineno
-#define yyout zconfout
-#define yyrestart zconfrestart
-#define yytext zconftext
-#define yywrap zconfwrap
-#define yyalloc zconfalloc
-#define yyrealloc zconfrealloc
-#define yyfree zconffree
-
-#define FLEX_SCANNER
-#define YY_FLEX_MAJOR_VERSION 2
-#define YY_FLEX_MINOR_VERSION 5
-#define YY_FLEX_SUBMINOR_VERSION 35
-#if YY_FLEX_SUBMINOR_VERSION > 0
-#define FLEX_BETA
-#endif
-
-/* First, we deal with  platform-specific or compiler-specific issues. */
-
-/* begin standard C headers. */
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-#include <stdlib.h>
-
-/* end standard C headers. */
-
-/* flex integer type definitions */
-
-#ifndef FLEXINT_H
-#define FLEXINT_H
-
-/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
-
-#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
-
-/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
- * if you want the limit (max/min) macros for int types. 
- */
-#ifndef __STDC_LIMIT_MACROS
-#define __STDC_LIMIT_MACROS 1
-#endif
-
-#include <inttypes.h>
-typedef int8_t flex_int8_t;
-typedef uint8_t flex_uint8_t;
-typedef int16_t flex_int16_t;
-typedef uint16_t flex_uint16_t;
-typedef int32_t flex_int32_t;
-typedef uint32_t flex_uint32_t;
-#else
-typedef signed char flex_int8_t;
-typedef short int flex_int16_t;
-typedef int flex_int32_t;
-typedef unsigned char flex_uint8_t; 
-typedef unsigned short int flex_uint16_t;
-typedef unsigned int flex_uint32_t;
-
-/* Limits of integral types. */
-#ifndef INT8_MIN
-#define INT8_MIN               (-128)
-#endif
-#ifndef INT16_MIN
-#define INT16_MIN              (-32767-1)
-#endif
-#ifndef INT32_MIN
-#define INT32_MIN              (-2147483647-1)
-#endif
-#ifndef INT8_MAX
-#define INT8_MAX               (127)
-#endif
-#ifndef INT16_MAX
-#define INT16_MAX              (32767)
-#endif
-#ifndef INT32_MAX
-#define INT32_MAX              (2147483647)
-#endif
-#ifndef UINT8_MAX
-#define UINT8_MAX              (255U)
-#endif
-#ifndef UINT16_MAX
-#define UINT16_MAX             (65535U)
-#endif
-#ifndef UINT32_MAX
-#define UINT32_MAX             (4294967295U)
-#endif
-
-#endif /* ! C99 */
-
-#endif /* ! FLEXINT_H */
-
-#ifdef __cplusplus
-
-/* The "const" storage-class-modifier is valid. */
-#define YY_USE_CONST
-
-#else	/* ! __cplusplus */
-
-/* C99 requires __STDC__ to be defined as 1. */
-#if defined (__STDC__)
-
-#define YY_USE_CONST
-
-#endif	/* defined (__STDC__) */
-#endif	/* ! __cplusplus */
-
-#ifdef YY_USE_CONST
-#define yyconst const
-#else
-#define yyconst
-#endif
-
-/* Returned upon end-of-file. */
-#define YY_NULL 0
-
-/* Promotes a possibly negative, possibly signed char to an unsigned
- * integer for use as an array index.  If the signed char is negative,
- * we want to instead treat it as an 8-bit unsigned char, hence the
- * double cast.
- */
-#define YY_SC_TO_UI(c) ((unsigned int) (unsigned char) c)
-
-/* Enter a start condition.  This macro really ought to take a parameter,
- * but we do it the disgusting crufty way forced on us by the ()-less
- * definition of BEGIN.
- */
-#define BEGIN (yy_start) = 1 + 2 *
-
-/* Translate the current start state into a value that can be later handed
- * to BEGIN to return to the state.  The YYSTATE alias is for lex
- * compatibility.
- */
-#define YY_START (((yy_start) - 1) / 2)
-#define YYSTATE YY_START
-
-/* Action number for EOF rule of a given start state. */
-#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)
-
-/* Special action meaning "start processing a new file". */
-#define YY_NEW_FILE zconfrestart(zconfin  )
-
-#define YY_END_OF_BUFFER_CHAR 0
-
-/* Size of default input buffer. */
-#ifndef YY_BUF_SIZE
-#ifdef __ia64__
-/* On IA-64, the buffer size is 16k, not 8k.
- * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case.
- * Ditto for the __ia64__ case accordingly.
- */
-#define YY_BUF_SIZE 32768
-#else
-#define YY_BUF_SIZE 16384
-#endif /* __ia64__ */
-#endif
-
-/* The state buf must be large enough to hold one state per character in the main buffer.
- */
-#define YY_STATE_BUF_SIZE   ((YY_BUF_SIZE + 2) * sizeof(yy_state_type))
-
-#ifndef YY_TYPEDEF_YY_BUFFER_STATE
-#define YY_TYPEDEF_YY_BUFFER_STATE
-typedef struct yy_buffer_state *YY_BUFFER_STATE;
-#endif
-
-extern int zconfleng;
-
-extern FILE *zconfin, *zconfout;
-
-#define EOB_ACT_CONTINUE_SCAN 0
-#define EOB_ACT_END_OF_FILE 1
-#define EOB_ACT_LAST_MATCH 2
-
-    #define YY_LESS_LINENO(n)
-    
-/* Return all but the first "n" matched characters back to the input stream. */
-#define yyless(n) \
-	do \
-		{ \
-		/* Undo effects of setting up zconftext. */ \
-        int yyless_macro_arg = (n); \
-        YY_LESS_LINENO(yyless_macro_arg);\
-		*yy_cp = (yy_hold_char); \
-		YY_RESTORE_YY_MORE_OFFSET \
-		(yy_c_buf_p) = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \
-		YY_DO_BEFORE_ACTION; /* set up zconftext again */ \
-		} \
-	while ( 0 )
-
-#define unput(c) yyunput( c, (yytext_ptr)  )
-
-#ifndef YY_TYPEDEF_YY_SIZE_T
-#define YY_TYPEDEF_YY_SIZE_T
-typedef size_t yy_size_t;
-#endif
-
-#ifndef YY_STRUCT_YY_BUFFER_STATE
-#define YY_STRUCT_YY_BUFFER_STATE
-struct yy_buffer_state
-	{
-	FILE *yy_input_file;
-
-	char *yy_ch_buf;		/* input buffer */
-	char *yy_buf_pos;		/* current position in input buffer */
-
-	/* Size of input buffer in bytes, not including room for EOB
-	 * characters.
-	 */
-	yy_size_t yy_buf_size;
-
-	/* Number of characters read into yy_ch_buf, not including EOB
-	 * characters.
-	 */
-	int yy_n_chars;
-
-	/* Whether we "own" the buffer - i.e., we know we created it,
-	 * and can realloc() it to grow it, and should free() it to
-	 * delete it.
-	 */
-	int yy_is_our_buffer;
-
-	/* Whether this is an "interactive" input source; if so, and
-	 * if we're using stdio for input, then we want to use getc()
-	 * instead of fread(), to make sure we stop fetching input after
-	 * each newline.
-	 */
-	int yy_is_interactive;
-
-	/* Whether we're considered to be at the beginning of a line.
-	 * If so, '^' rules will be active on the next match, otherwise
-	 * not.
-	 */
-	int yy_at_bol;
-
-    int yy_bs_lineno; /**< The line count. */
-    int yy_bs_column; /**< The column count. */
-    
-	/* Whether to try to fill the input buffer when we reach the
-	 * end of it.
-	 */
-	int yy_fill_buffer;
-
-	int yy_buffer_status;
-
-#define YY_BUFFER_NEW 0
-#define YY_BUFFER_NORMAL 1
-	/* When an EOF's been seen but there's still some text to process
-	 * then we mark the buffer as YY_EOF_PENDING, to indicate that we
-	 * shouldn't try reading from the input source any more.  We might
-	 * still have a bunch of tokens to match, though, because of
-	 * possible backing-up.
-	 *
-	 * When we actually see the EOF, we change the status to "new"
-	 * (via zconfrestart()), so that the user can continue scanning by
-	 * just pointing zconfin at a new input file.
-	 */
-#define YY_BUFFER_EOF_PENDING 2
-
-	};
-#endif /* !YY_STRUCT_YY_BUFFER_STATE */
-
-/* Stack of input buffers. */
-static size_t yy_buffer_stack_top = 0; /**< index of top of stack. */
-static size_t yy_buffer_stack_max = 0; /**< capacity of stack. */
-static YY_BUFFER_STATE * yy_buffer_stack = 0; /**< Stack as an array. */
-
-/* We provide macros for accessing buffer states in case in the
- * future we want to put the buffer states in a more general
- * "scanner state".
- *
- * Returns the top of the stack, or NULL.
- */
-#define YY_CURRENT_BUFFER ( (yy_buffer_stack) \
-                          ? (yy_buffer_stack)[(yy_buffer_stack_top)] \
-                          : NULL)
-
-/* Same as previous macro, but useful when we know that the buffer stack is not
- * NULL or when we need an lvalue. For internal use only.
- */
-#define YY_CURRENT_BUFFER_LVALUE (yy_buffer_stack)[(yy_buffer_stack_top)]
-
-/* yy_hold_char holds the character lost when zconftext is formed. */
-static char yy_hold_char;
-static int yy_n_chars;		/* number of characters read into yy_ch_buf */
-int zconfleng;
-
-/* Points to current character in buffer. */
-static char *yy_c_buf_p = (char *) 0;
-static int yy_init = 0;		/* whether we need to initialize */
-static int yy_start = 0;	/* start state number */
-
-/* Flag which is used to allow zconfwrap()'s to do buffer switches
- * instead of setting up a fresh zconfin.  A bit of a hack ...
- */
-static int yy_did_buffer_switch_on_eof;
-
-void zconfrestart (FILE *input_file  );
-void zconf_switch_to_buffer (YY_BUFFER_STATE new_buffer  );
-YY_BUFFER_STATE zconf_create_buffer (FILE *file,int size  );
-void zconf_delete_buffer (YY_BUFFER_STATE b  );
-void zconf_flush_buffer (YY_BUFFER_STATE b  );
-void zconfpush_buffer_state (YY_BUFFER_STATE new_buffer  );
-void zconfpop_buffer_state (void );
-
-static void zconfensure_buffer_stack (void );
-static void zconf_load_buffer_state (void );
-static void zconf_init_buffer (YY_BUFFER_STATE b,FILE *file  );
-
-#define YY_FLUSH_BUFFER zconf_flush_buffer(YY_CURRENT_BUFFER )
-
-YY_BUFFER_STATE zconf_scan_buffer (char *base,yy_size_t size  );
-YY_BUFFER_STATE zconf_scan_string (yyconst char *yy_str  );
-YY_BUFFER_STATE zconf_scan_bytes (yyconst char *bytes,int len  );
-
-void *zconfalloc (yy_size_t  );
-void *zconfrealloc (void *,yy_size_t  );
-void zconffree (void *  );
-
-#define yy_new_buffer zconf_create_buffer
-
-#define yy_set_interactive(is_interactive) \
-	{ \
-	if ( ! YY_CURRENT_BUFFER ){ \
-        zconfensure_buffer_stack (); \
-		YY_CURRENT_BUFFER_LVALUE =    \
-            zconf_create_buffer(zconfin,YY_BUF_SIZE ); \
-	} \
-	YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \
-	}
-
-#define yy_set_bol(at_bol) \
-	{ \
-	if ( ! YY_CURRENT_BUFFER ){\
-        zconfensure_buffer_stack (); \
-		YY_CURRENT_BUFFER_LVALUE =    \
-            zconf_create_buffer(zconfin,YY_BUF_SIZE ); \
-	} \
-	YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \
-	}
-
-#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol)
-
-/* Begin user sect3 */
-
-#define zconfwrap(n) 1
-#define YY_SKIP_YYWRAP
-
-typedef unsigned char YY_CHAR;
-
-FILE *zconfin = (FILE *) 0, *zconfout = (FILE *) 0;
-
-typedef int yy_state_type;
-
-extern int zconflineno;
-
-int zconflineno = 1;
-
-extern char *zconftext;
-#define yytext_ptr zconftext
-static yyconst flex_int16_t yy_nxt[][18] =
-    {
-    {
-        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
-        0,    0,    0,    0,    0,    0,    0,    0
-    },
-
-    {
-       11,   12,   13,   14,   12,   12,   15,   12,   12,   12,
-       12,   12,   12,   12,   12,   12,   12,   12
-    },
-
-    {
-       11,   12,   13,   14,   12,   12,   15,   12,   12,   12,
-       12,   12,   12,   12,   12,   12,   12,   12
-    },
-
-    {
-       11,   16,   16,   17,   16,   16,   16,   16,   16,   16,
-       16,   18,   16,   16,   16,   16,   16,   16
-    },
-
-    {
-       11,   16,   16,   17,   16,   16,   16,   16,   16,   16,
-       16,   18,   16,   16,   16,   16,   16,   16
-
-    },
-
-    {
-       11,   19,   20,   21,   19,   19,   19,   19,   19,   19,
-       19,   19,   19,   19,   19,   19,   19,   19
-    },
-
-    {
-       11,   19,   20,   21,   19,   19,   19,   19,   19,   19,
-       19,   19,   19,   19,   19,   19,   19,   19
-    },
-
-    {
-       11,   22,   22,   23,   22,   24,   22,   22,   24,   22,
-       22,   22,   22,   22,   22,   22,   25,   22
-    },
-
-    {
-       11,   22,   22,   23,   22,   24,   22,   22,   24,   22,
-       22,   22,   22,   22,   22,   22,   25,   22
-    },
-
-    {
-       11,   26,   27,   28,   29,   30,   31,   32,   30,   33,
-       34,   35,   35,   36,   37,   38,   39,   40
-
-    },
-
-    {
-       11,   26,   27,   28,   29,   30,   31,   32,   30,   33,
-       34,   35,   35,   36,   37,   38,   39,   40
-    },
-
-    {
-      -11,  -11,  -11,  -11,  -11,  -11,  -11,  -11,  -11,  -11,
-      -11,  -11,  -11,  -11,  -11,  -11,  -11,  -11
-    },
-
-    {
-       11,  -12,  -12,  -12,  -12,  -12,  -12,  -12,  -12,  -12,
-      -12,  -12,  -12,  -12,  -12,  -12,  -12,  -12
-    },
-
-    {
-       11,  -13,   41,   42,  -13,  -13,   43,  -13,  -13,  -13,
-      -13,  -13,  -13,  -13,  -13,  -13,  -13,  -13
-    },
-
-    {
-       11,  -14,  -14,  -14,  -14,  -14,  -14,  -14,  -14,  -14,
-      -14,  -14,  -14,  -14,  -14,  -14,  -14,  -14
-
-    },
-
-    {
-       11,   44,   44,   45,   44,   44,   44,   44,   44,   44,
-       44,   44,   44,   44,   44,   44,   44,   44
-    },
-
-    {
-       11,  -16,  -16,  -16,  -16,  -16,  -16,  -16,  -16,  -16,
-      -16,  -16,  -16,  -16,  -16,  -16,  -16,  -16
-    },
-
-    {
-       11,  -17,  -17,  -17,  -17,  -17,  -17,  -17,  -17,  -17,
-      -17,  -17,  -17,  -17,  -17,  -17,  -17,  -17
-    },
-
-    {
-       11,  -18,  -18,  -18,  -18,  -18,  -18,  -18,  -18,  -18,
-      -18,   46,  -18,  -18,  -18,  -18,  -18,  -18
-    },
-
-    {
-       11,   47,   47,  -19,   47,   47,   47,   47,   47,   47,
-       47,   47,   47,   47,   47,   47,   47,   47
-
-    },
-
-    {
-       11,  -20,   48,   49,  -20,  -20,  -20,  -20,  -20,  -20,
-      -20,  -20,  -20,  -20,  -20,  -20,  -20,  -20
-    },
-
-    {
-       11,   50,  -21,  -21,   50,   50,   50,   50,   50,   50,
-       50,   50,   50,   50,   50,   50,   50,   50
-    },
-
-    {
-       11,   51,   51,   52,   51,  -22,   51,   51,  -22,   51,
-       51,   51,   51,   51,   51,   51,  -22,   51
-    },
-
-    {
-       11,  -23,  -23,  -23,  -23,  -23,  -23,  -23,  -23,  -23,
-      -23,  -23,  -23,  -23,  -23,  -23,  -23,  -23
-    },
-
-    {
-       11,  -24,  -24,  -24,  -24,  -24,  -24,  -24,  -24,  -24,
-      -24,  -24,  -24,  -24,  -24,  -24,  -24,  -24
-
-    },
-
-    {
-       11,   53,   53,   54,   53,   53,   53,   53,   53,   53,
-       53,   53,   53,   53,   53,   53,   53,   53
-    },
-
-    {
-       11,  -26,  -26,  -26,  -26,  -26,  -26,  -26,  -26,  -26,
-      -26,  -26,  -26,  -26,  -26,  -26,  -26,  -26
-    },
-
-    {
-       11,  -27,   55,  -27,  -27,  -27,  -27,  -27,  -27,  -27,
-      -27,  -27,  -27,  -27,  -27,  -27,  -27,  -27
-    },
-
-    {
-       11,  -28,  -28,  -28,  -28,  -28,  -28,  -28,  -28,  -28,
-      -28,  -28,  -28,  -28,  -28,  -28,  -28,  -28
-    },
-
-    {
-       11,  -29,  -29,  -29,  -29,  -29,  -29,  -29,  -29,  -29,
-      -29,  -29,  -29,  -29,   56,  -29,  -29,  -29
-
-    },
-
-    {
-       11,  -30,  -30,  -30,  -30,  -30,  -30,  -30,  -30,  -30,
-      -30,  -30,  -30,  -30,  -30,  -30,  -30,  -30
-    },
-
-    {
-       11,   57,   57,  -31,   57,   57,   57,   57,   57,   57,
-       57,   57,   57,   57,   57,   57,   57,   57
-    },
-
-    {
-       11,  -32,  -32,  -32,  -32,  -32,  -32,   58,  -32,  -32,
-      -32,  -32,  -32,  -32,  -32,  -32,  -32,  -32
-    },
-
-    {
-       11,  -33,  -33,  -33,  -33,  -33,  -33,  -33,  -33,  -33,
-      -33,  -33,  -33,  -33,  -33,  -33,  -33,  -33
-    },
-
-    {
-       11,  -34,  -34,  -34,  -34,  -34,  -34,  -34,  -34,  -34,
-      -34,  -34,  -34,  -34,  -34,  -34,  -34,  -34
-
-    },
-
-    {
-       11,  -35,  -35,  -35,  -35,  -35,  -35,  -35,  -35,  -35,
-      -35,   59,   59,  -35,  -35,  -35,  -35,  -35
-    },
-
-    {
-       11,  -36,  -36,  -36,  -36,  -36,  -36,  -36,  -36,  -36,
-      -36,  -36,  -36,  -36,   60,  -36,  -36,  -36
-    },
-
-    {
-       11,  -37,  -37,  -37,  -37,  -37,  -37,  -37,  -37,  -37,
-      -37,  -37,  -37,  -37,  -37,  -37,  -37,  -37
-    },
-
-    {
-       11,  -38,  -38,  -38,  -38,  -38,  -38,  -38,  -38,  -38,
-      -38,  -38,  -38,  -38,   61,  -38,  -38,  -38
-    },
-
-    {
-       11,  -39,  -39,   62,  -39,  -39,  -39,  -39,  -39,  -39,
-      -39,  -39,  -39,  -39,  -39,  -39,  -39,  -39
-
-    },
-
-    {
-       11,  -40,  -40,  -40,  -40,  -40,  -40,  -40,  -40,  -40,
-      -40,  -40,  -40,  -40,  -40,  -40,  -40,   63
-    },
-
-    {
-       11,  -41,   41,   42,  -41,  -41,   43,  -41,  -41,  -41,
-      -41,  -41,  -41,  -41,  -41,  -41,  -41,  -41
-    },
-
-    {
-       11,  -42,  -42,  -42,  -42,  -42,  -42,  -42,  -42,  -42,
-      -42,  -42,  -42,  -42,  -42,  -42,  -42,  -42
-    },
-
-    {
-       11,   44,   44,   45,   44,   44,   44,   44,   44,   44,
-       44,   44,   44,   44,   44,   44,   44,   44
-    },
-
-    {
-       11,   44,   44,   45,   44,   44,   44,   44,   44,   44,
-       44,   44,   44,   44,   44,   44,   44,   44
-
-    },
-
-    {
-       11,  -45,  -45,  -45,  -45,  -45,  -45,  -45,  -45,  -45,
-      -45,  -45,  -45,  -45,  -45,  -45,  -45,  -45
-    },
-
-    {
-       11,  -46,  -46,  -46,  -46,  -46,  -46,  -46,  -46,  -46,
-      -46,   46,  -46,  -46,  -46,  -46,  -46,  -46
-    },
-
-    {
-       11,   47,   47,  -47,   47,   47,   47,   47,   47,   47,
-       47,   47,   47,   47,   47,   47,   47,   47
-    },
-
-    {
-       11,  -48,   48,   49,  -48,  -48,  -48,  -48,  -48,  -48,
-      -48,  -48,  -48,  -48,  -48,  -48,  -48,  -48
-    },
-
-    {
-       11,   50,  -49,  -49,   50,   50,   50,   50,   50,   50,
-       50,   50,   50,   50,   50,   50,   50,   50
-
-    },
-
-    {
-       11,  -50,  -50,  -50,  -50,  -50,  -50,  -50,  -50,  -50,
-      -50,  -50,  -50,  -50,  -50,  -50,  -50,  -50
-    },
-
-    {
-       11,   51,   51,   52,   51,  -51,   51,   51,  -51,   51,
-       51,   51,   51,   51,   51,   51,  -51,   51
-    },
-
-    {
-       11,  -52,  -52,  -52,  -52,  -52,  -52,  -52,  -52,  -52,
-      -52,  -52,  -52,  -52,  -52,  -52,  -52,  -52
-    },
-
-    {
-       11,  -53,  -53,   54,  -53,  -53,  -53,  -53,  -53,  -53,
-      -53,  -53,  -53,  -53,  -53,  -53,  -53,  -53
-    },
-
-    {
-       11,  -54,  -54,  -54,  -54,  -54,  -54,  -54,  -54,  -54,
-      -54,  -54,  -54,  -54,  -54,  -54,  -54,  -54
-
-    },
-
-    {
-       11,  -55,   55,  -55,  -55,  -55,  -55,  -55,  -55,  -55,
-      -55,  -55,  -55,  -55,  -55,  -55,  -55,  -55
-    },
-
-    {
-       11,  -56,  -56,  -56,  -56,  -56,  -56,  -56,  -56,  -56,
-      -56,  -56,  -56,  -56,  -56,  -56,  -56,  -56
-    },
-
-    {
-       11,   57,   57,  -57,   57,   57,   57,   57,   57,   57,
-       57,   57,   57,   57,   57,   57,   57,   57
-    },
-
-    {
-       11,  -58,  -58,  -58,  -58,  -58,  -58,  -58,  -58,  -58,
-      -58,  -58,  -58,  -58,  -58,  -58,  -58,  -58
-    },
-
-    {
-       11,  -59,  -59,  -59,  -59,  -59,  -59,  -59,  -59,  -59,
-      -59,   59,   59,  -59,  -59,  -59,  -59,  -59
-
-    },
-
-    {
-       11,  -60,  -60,  -60,  -60,  -60,  -60,  -60,  -60,  -60,
-      -60,  -60,  -60,  -60,  -60,  -60,  -60,  -60
-    },
-
-    {
-       11,  -61,  -61,  -61,  -61,  -61,  -61,  -61,  -61,  -61,
-      -61,  -61,  -61,  -61,  -61,  -61,  -61,  -61
-    },
-
-    {
-       11,  -62,  -62,  -62,  -62,  -62,  -62,  -62,  -62,  -62,
-      -62,  -62,  -62,  -62,  -62,  -62,  -62,  -62
-    },
-
-    {
-       11,  -63,  -63,  -63,  -63,  -63,  -63,  -63,  -63,  -63,
-      -63,  -63,  -63,  -63,  -63,  -63,  -63,  -63
-    },
-
-    } ;
-
-static yy_state_type yy_get_previous_state (void );
-static yy_state_type yy_try_NUL_trans (yy_state_type current_state  );
-static int yy_get_next_buffer (void );
-static void yy_fatal_error (yyconst char msg[]  );
-
-/* Done after the current pattern has been matched and before the
- * corresponding action - sets up zconftext.
- */
-#define YY_DO_BEFORE_ACTION \
-	(yytext_ptr) = yy_bp; \
-	zconfleng = (size_t) (yy_cp - yy_bp); \
-	(yy_hold_char) = *yy_cp; \
-	*yy_cp = '\0'; \
-	(yy_c_buf_p) = yy_cp;
-
-#define YY_NUM_RULES 37
-#define YY_END_OF_BUFFER 38
-/* This struct is not used in this scanner,
-   but its presence is necessary. */
-struct yy_trans_info
-	{
-	flex_int32_t yy_verify;
-	flex_int32_t yy_nxt;
-	};
-static yyconst flex_int16_t yy_accept[64] =
-    {   0,
-        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
-       38,    5,    4,    2,    3,    7,    8,    6,   36,   33,
-       35,   28,   32,   31,   30,   26,   25,   21,   13,   20,
-       23,   26,   11,   12,   22,   18,   14,   19,   26,   26,
-        4,    2,    3,    3,    1,    6,   36,   33,   35,   34,
-       28,   27,   30,   29,   25,   15,   23,    9,   22,   16,
-       17,   24,   10
-    } ;
-
-static yyconst flex_int32_t yy_ec[256] =
-    {   0,
-        1,    1,    1,    1,    1,    1,    1,    1,    2,    3,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    2,    4,    5,    6,    1,    1,    7,    8,    9,
-       10,    1,    1,    1,   11,   12,   12,   11,   11,   11,
-       11,   11,   11,   11,   11,   11,   11,    1,    1,   13,
-       14,   15,    1,    1,   11,   11,   11,   11,   11,   11,
-       11,   11,   11,   11,   11,   11,   11,   11,   11,   11,
-       11,   11,   11,   11,   11,   11,   11,   11,   11,   11,
-        1,   16,    1,    1,   11,    1,   11,   11,   11,   11,
-
-       11,   11,   11,   11,   11,   11,   11,   11,   11,   11,
-       11,   11,   11,   11,   11,   11,   11,   11,   11,   11,
-       11,   11,    1,   17,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
-        1,    1,    1,    1,    1
-    } ;
-
-extern int zconf_flex_debug;
-int zconf_flex_debug = 0;
-
-/* The intent behind this definition is that it'll catch
- * any uses of REJECT which flex missed.
- */
-#define REJECT reject_used_but_not_detected
-#define yymore() yymore_used_but_not_detected
-#define YY_MORE_ADJ 0
-#define YY_RESTORE_YY_MORE_OFFSET
-char *zconftext;
-#define YY_NO_INPUT 1
-
-/*
- * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
- */
-
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "lkc.h"
-
-#define START_STRSIZE	16
-
-static struct {
-	struct file *file;
-	int lineno;
-} current_pos;
-
-static char *text;
-static int text_size, text_asize;
-
-struct buffer {
-	struct buffer *parent;
-	YY_BUFFER_STATE state;
-};
-
-struct buffer *current_buf;
-
-static int last_ts, first_ts;
-
-static void zconf_endhelp(void);
-static void zconf_endfile(void);
-
-static void new_string(void)
-{
-	text = xmalloc(START_STRSIZE);
-	text_asize = START_STRSIZE;
-	text_size = 0;
-	*text = 0;
-}
-
-static void append_string(const char *str, int size)
-{
-	int new_size = text_size + size + 1;
-	if (new_size > text_asize) {
-		new_size += START_STRSIZE - 1;
-		new_size &= -START_STRSIZE;
-		text = realloc(text, new_size);
-		text_asize = new_size;
-	}
-	memcpy(text + text_size, str, size);
-	text_size += size;
-	text[text_size] = 0;
-}
-
-static void alloc_string(const char *str, int size)
-{
-	text = xmalloc(size + 1);
-	memcpy(text, str, size);
-	text[size] = 0;
-}
-
-static void warn_ignored_character(char chr)
-{
-	fprintf(stderr,
-	        "%s:%d:warning: ignoring unsupported character '%c'\n",
-	        zconf_curname(), zconf_lineno(), chr);
-}
-
-#define INITIAL 0
-#define COMMAND 1
-#define HELP 2
-#define STRING 3
-#define PARAM 4
-
-#ifndef YY_NO_UNISTD_H
-/* Special case for "unistd.h", since it is non-ANSI. We include it way
- * down here because we want the user's section 1 to have been scanned first.
- * The user has a chance to override it with an option.
- */
-#include <unistd.h>
-#endif
-
-#ifndef YY_EXTRA_TYPE
-#define YY_EXTRA_TYPE void *
-#endif
-
-static int yy_init_globals (void );
-
-/* Accessor methods to globals.
-   These are made visible to non-reentrant scanners for convenience. */
-
-int zconflex_destroy (void );
-
-int zconfget_debug (void );
-
-void zconfset_debug (int debug_flag  );
-
-YY_EXTRA_TYPE zconfget_extra (void );
-
-void zconfset_extra (YY_EXTRA_TYPE user_defined  );
-
-FILE *zconfget_in (void );
-
-void zconfset_in  (FILE * in_str  );
-
-FILE *zconfget_out (void );
-
-void zconfset_out  (FILE * out_str  );
-
-int zconfget_leng (void );
-
-char *zconfget_text (void );
-
-int zconfget_lineno (void );
-
-void zconfset_lineno (int line_number  );
-
-/* Macros after this point can all be overridden by user definitions in
- * section 1.
- */
-
-#ifndef YY_SKIP_YYWRAP
-#ifdef __cplusplus
-extern "C" int zconfwrap (void );
-#else
-extern int zconfwrap (void );
-#endif
-#endif
-
-    static void yyunput (int c,char *buf_ptr  );
-    
-#ifndef yytext_ptr
-static void yy_flex_strncpy (char *,yyconst char *,int );
-#endif
-
-#ifdef YY_NEED_STRLEN
-static int yy_flex_strlen (yyconst char * );
-#endif
-
-#ifndef YY_NO_INPUT
-
-#ifdef __cplusplus
-static int yyinput (void );
-#else
-static int input (void );
-#endif
-
-#endif
-
-/* Amount of stuff to slurp up with each read. */
-#ifndef YY_READ_BUF_SIZE
-#ifdef __ia64__
-/* On IA-64, the buffer size is 16k, not 8k */
-#define YY_READ_BUF_SIZE 16384
-#else
-#define YY_READ_BUF_SIZE 8192
-#endif /* __ia64__ */
-#endif
-
-/* Copy whatever the last rule matched to the standard output. */
-#ifndef ECHO
-/* This used to be an fputs(), but since the string might contain NUL's,
- * we now use fwrite().
- */
-#define ECHO do { if (fwrite( zconftext, zconfleng, 1, zconfout )) {} } while (0)
-#endif
-
-/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
- * is returned in "result".
- */
-#ifndef YY_INPUT
-#define YY_INPUT(buf,result,max_size) \
-	errno=0; \
-	while ( (result = read( fileno(zconfin), (char *) buf, max_size )) < 0 ) \
-	{ \
-		if( errno != EINTR) \
-		{ \
-			YY_FATAL_ERROR( "input in flex scanner failed" ); \
-			break; \
-		} \
-		errno=0; \
-		clearerr(zconfin); \
-	}\
-\
-
-#endif
-
-/* No semi-colon after return; correct usage is to write "yyterminate();" -
- * we don't want an extra ';' after the "return" because that will cause
- * some compilers to complain about unreachable statements.
- */
-#ifndef yyterminate
-#define yyterminate() return YY_NULL
-#endif
-
-/* Number of entries by which start-condition stack grows. */
-#ifndef YY_START_STACK_INCR
-#define YY_START_STACK_INCR 25
-#endif
-
-/* Report a fatal error. */
-#ifndef YY_FATAL_ERROR
-#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
-#endif
-
-/* end tables serialization structures and prototypes */
-
-/* Default declaration of generated scanner - a define so the user can
- * easily add parameters.
- */
-#ifndef YY_DECL
-#define YY_DECL_IS_OURS 1
-
-extern int zconflex (void);
-
-#define YY_DECL int zconflex (void)
-#endif /* !YY_DECL */
-
-/* Code executed at the beginning of each rule, after zconftext and zconfleng
- * have been set up.
- */
-#ifndef YY_USER_ACTION
-#define YY_USER_ACTION
-#endif
-
-/* Code executed at the end of each rule. */
-#ifndef YY_BREAK
-#define YY_BREAK break;
-#endif
-
-#define YY_RULE_SETUP \
-	YY_USER_ACTION
-
-/** The main scanner function which does all the work.
- */
-YY_DECL
-{
-	register yy_state_type yy_current_state;
-	register char *yy_cp, *yy_bp;
-	register int yy_act;
-    
-	int str = 0;
-	int ts, i;
-
-	if ( !(yy_init) )
-		{
-		(yy_init) = 1;
-
-#ifdef YY_USER_INIT
-		YY_USER_INIT;
-#endif
-
-		if ( ! (yy_start) )
-			(yy_start) = 1;	/* first start state */
-
-		if ( ! zconfin )
-			zconfin = stdin;
-
-		if ( ! zconfout )
-			zconfout = stdout;
-
-		if ( ! YY_CURRENT_BUFFER ) {
-			zconfensure_buffer_stack ();
-			YY_CURRENT_BUFFER_LVALUE =
-				zconf_create_buffer(zconfin,YY_BUF_SIZE );
-		}
-
-		zconf_load_buffer_state( );
-		}
-
-	while ( 1 )		/* loops until end-of-file is reached */
-		{
-		yy_cp = (yy_c_buf_p);
-
-		/* Support of zconftext. */
-		*yy_cp = (yy_hold_char);
-
-		/* yy_bp points to the position in yy_ch_buf of the start of
-		 * the current run.
-		 */
-		yy_bp = yy_cp;
-
-		yy_current_state = (yy_start);
-yy_match:
-		while ( (yy_current_state = yy_nxt[yy_current_state][ yy_ec[YY_SC_TO_UI(*yy_cp)]  ]) > 0 )
-			++yy_cp;
-
-		yy_current_state = -yy_current_state;
-
-yy_find_action:
-		yy_act = yy_accept[yy_current_state];
-
-		YY_DO_BEFORE_ACTION;
-
-do_action:	/* This label is used only to access EOF actions. */
-
-		switch ( yy_act )
-	{ /* beginning of action switch */
-case 1:
-/* rule 1 can match eol */
-case 2:
-/* rule 2 can match eol */
-YY_RULE_SETUP
-{
-	current_file->lineno++;
-	return T_EOL;
-}
-	YY_BREAK
-case 3:
-YY_RULE_SETUP
-
-	YY_BREAK
-case 4:
-YY_RULE_SETUP
-{
-	BEGIN(COMMAND);
-}
-	YY_BREAK
-case 5:
-YY_RULE_SETUP
-{
-	unput(zconftext[0]);
-	BEGIN(COMMAND);
-}
-	YY_BREAK
-
-case 6:
-YY_RULE_SETUP
-{
-		const struct kconf_id *id = kconf_id_lookup(zconftext, zconfleng);
-		BEGIN(PARAM);
-		current_pos.file = current_file;
-		current_pos.lineno = current_file->lineno;
-		if (id && id->flags & TF_COMMAND) {
-			zconflval.id = id;
-			return id->token;
-		}
-		alloc_string(zconftext, zconfleng);
-		zconflval.string = text;
-		return T_WORD;
-	}
-	YY_BREAK
-case 7:
-YY_RULE_SETUP
-warn_ignored_character(*zconftext);
-	YY_BREAK
-case 8:
-/* rule 8 can match eol */
-YY_RULE_SETUP
-{
-		BEGIN(INITIAL);
-		current_file->lineno++;
-		return T_EOL;
-	}
-	YY_BREAK
-
-case 9:
-YY_RULE_SETUP
-return T_AND;
-	YY_BREAK
-case 10:
-YY_RULE_SETUP
-return T_OR;
-	YY_BREAK
-case 11:
-YY_RULE_SETUP
-return T_OPEN_PAREN;
-	YY_BREAK
-case 12:
-YY_RULE_SETUP
-return T_CLOSE_PAREN;
-	YY_BREAK
-case 13:
-YY_RULE_SETUP
-return T_NOT;
-	YY_BREAK
-case 14:
-YY_RULE_SETUP
-return T_EQUAL;
-	YY_BREAK
-case 15:
-YY_RULE_SETUP
-return T_UNEQUAL;
-	YY_BREAK
-case 16:
-YY_RULE_SETUP
-return T_LESS_EQUAL;
-	YY_BREAK
-case 17:
-YY_RULE_SETUP
-return T_GREATER_EQUAL;
-	YY_BREAK
-case 18:
-YY_RULE_SETUP
-return T_LESS;
-	YY_BREAK
-case 19:
-YY_RULE_SETUP
-return T_GREATER;
-	YY_BREAK
-case 20:
-YY_RULE_SETUP
-{
-		str = zconftext[0];
-		new_string();
-		BEGIN(STRING);
-	}
-	YY_BREAK
-case 21:
-/* rule 21 can match eol */
-YY_RULE_SETUP
-BEGIN(INITIAL); current_file->lineno++; return T_EOL;
-	YY_BREAK
-case 22:
-YY_RULE_SETUP
-{
-		const struct kconf_id *id = kconf_id_lookup(zconftext, zconfleng);
-		if (id && id->flags & TF_PARAM) {
-			zconflval.id = id;
-			return id->token;
-		}
-		alloc_string(zconftext, zconfleng);
-		zconflval.string = text;
-		return T_WORD;
-	}
-	YY_BREAK
-case 23:
-YY_RULE_SETUP
-/* comment */
-	YY_BREAK
-case 24:
-/* rule 24 can match eol */
-YY_RULE_SETUP
-current_file->lineno++;
-	YY_BREAK
-case 25:
-YY_RULE_SETUP
-
-	YY_BREAK
-case 26:
-YY_RULE_SETUP
-warn_ignored_character(*zconftext);
-	YY_BREAK
-case YY_STATE_EOF(PARAM):
-{
-		BEGIN(INITIAL);
-	}
-	YY_BREAK
-
-case 27:
-/* rule 27 can match eol */
-*yy_cp = (yy_hold_char); /* undo effects of setting up zconftext */
-(yy_c_buf_p) = yy_cp -= 1;
-YY_DO_BEFORE_ACTION; /* set up zconftext again */
-YY_RULE_SETUP
-{
-		append_string(zconftext, zconfleng);
-		zconflval.string = text;
-		return T_WORD_QUOTE;
-	}
-	YY_BREAK
-case 28:
-YY_RULE_SETUP
-{
-		append_string(zconftext, zconfleng);
-	}
-	YY_BREAK
-case 29:
-/* rule 29 can match eol */
-*yy_cp = (yy_hold_char); /* undo effects of setting up zconftext */
-(yy_c_buf_p) = yy_cp -= 1;
-YY_DO_BEFORE_ACTION; /* set up zconftext again */
-YY_RULE_SETUP
-{
-		append_string(zconftext + 1, zconfleng - 1);
-		zconflval.string = text;
-		return T_WORD_QUOTE;
-	}
-	YY_BREAK
-case 30:
-YY_RULE_SETUP
-{
-		append_string(zconftext + 1, zconfleng - 1);
-	}
-	YY_BREAK
-case 31:
-YY_RULE_SETUP
-{
-		if (str == zconftext[0]) {
-			BEGIN(PARAM);
-			zconflval.string = text;
-			return T_WORD_QUOTE;
-		} else
-			append_string(zconftext, 1);
-	}
-	YY_BREAK
-case 32:
-/* rule 32 can match eol */
-YY_RULE_SETUP
-{
-		printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
-		current_file->lineno++;
-		BEGIN(INITIAL);
-		return T_EOL;
-	}
-	YY_BREAK
-case YY_STATE_EOF(STRING):
-{
-		BEGIN(INITIAL);
-	}
-	YY_BREAK
-
-case 33:
-YY_RULE_SETUP
-{
-		ts = 0;
-		for (i = 0; i < zconfleng; i++) {
-			if (zconftext[i] == '\t')
-				ts = (ts & ~7) + 8;
-			else
-				ts++;
-		}
-		last_ts = ts;
-		if (first_ts) {
-			if (ts < first_ts) {
-				zconf_endhelp();
-				return T_HELPTEXT;
-			}
-			ts -= first_ts;
-			while (ts > 8) {
-				append_string("        ", 8);
-				ts -= 8;
-			}
-			append_string("        ", ts);
-		}
-	}
-	YY_BREAK
-case 34:
-/* rule 34 can match eol */
-*yy_cp = (yy_hold_char); /* undo effects of setting up zconftext */
-(yy_c_buf_p) = yy_cp -= 1;
-YY_DO_BEFORE_ACTION; /* set up zconftext again */
-YY_RULE_SETUP
-{
-		current_file->lineno++;
-		zconf_endhelp();
-		return T_HELPTEXT;
-	}
-	YY_BREAK
-case 35:
-/* rule 35 can match eol */
-YY_RULE_SETUP
-{
-		current_file->lineno++;
-		append_string("\n", 1);
-	}
-	YY_BREAK
-case 36:
-YY_RULE_SETUP
-{
-		while (zconfleng) {
-			if ((zconftext[zconfleng-1] != ' ') && (zconftext[zconfleng-1] != '\t'))
-				break;
-			zconfleng--;
-		}
-		append_string(zconftext, zconfleng);
-		if (!first_ts)
-			first_ts = last_ts;
-	}
-	YY_BREAK
-case YY_STATE_EOF(HELP):
-{
-		zconf_endhelp();
-		return T_HELPTEXT;
-	}
-	YY_BREAK
-
-case YY_STATE_EOF(INITIAL):
-case YY_STATE_EOF(COMMAND):
-{
-	if (current_file) {
-		zconf_endfile();
-		return T_EOL;
-	}
-	fclose(zconfin);
-	yyterminate();
-}
-	YY_BREAK
-case 37:
-YY_RULE_SETUP
-YY_FATAL_ERROR( "flex scanner jammed" );
-	YY_BREAK
-
-	case YY_END_OF_BUFFER:
-		{
-		/* Amount of text matched not including the EOB char. */
-		int yy_amount_of_matched_text = (int) (yy_cp - (yytext_ptr)) - 1;
-
-		/* Undo the effects of YY_DO_BEFORE_ACTION. */
-		*yy_cp = (yy_hold_char);
-		YY_RESTORE_YY_MORE_OFFSET
-
-		if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW )
-			{
-			/* We're scanning a new file or input source.  It's
-			 * possible that this happened because the user
-			 * just pointed zconfin at a new source and called
-			 * zconflex().  If so, then we have to assure
-			 * consistency between YY_CURRENT_BUFFER and our
-			 * globals.  Here is the right place to do so, because
-			 * this is the first action (other than possibly a
-			 * back-up) that will match for the new input source.
-			 */
-			(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
-			YY_CURRENT_BUFFER_LVALUE->yy_input_file = zconfin;
-			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL;
-			}
-
-		/* Note that here we test for yy_c_buf_p "<=" to the position
-		 * of the first EOB in the buffer, since yy_c_buf_p will
-		 * already have been incremented past the NUL character
-		 * (since all states make transitions on EOB to the
-		 * end-of-buffer state).  Contrast this with the test
-		 * in input().
-		 */
-		if ( (yy_c_buf_p) <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
-			{ /* This was really a NUL. */
-			yy_state_type yy_next_state;
-
-			(yy_c_buf_p) = (yytext_ptr) + yy_amount_of_matched_text;
-
-			yy_current_state = yy_get_previous_state(  );
-
-			/* Okay, we're now positioned to make the NUL
-			 * transition.  We couldn't have
-			 * yy_get_previous_state() go ahead and do it
-			 * for us because it doesn't know how to deal
-			 * with the possibility of jamming (and we don't
-			 * want to build jamming into it because then it
-			 * will run more slowly).
-			 */
-
-			yy_next_state = yy_try_NUL_trans( yy_current_state );
-
-			yy_bp = (yytext_ptr) + YY_MORE_ADJ;
-
-			if ( yy_next_state )
-				{
-				/* Consume the NUL. */
-				yy_cp = ++(yy_c_buf_p);
-				yy_current_state = yy_next_state;
-				goto yy_match;
-				}
-
-			else
-				{
-				yy_cp = (yy_c_buf_p);
-				goto yy_find_action;
-				}
-			}
-
-		else switch ( yy_get_next_buffer(  ) )
-			{
-			case EOB_ACT_END_OF_FILE:
-				{
-				(yy_did_buffer_switch_on_eof) = 0;
-
-				if ( zconfwrap( ) )
-					{
-					/* Note: because we've taken care in
-					 * yy_get_next_buffer() to have set up
-					 * zconftext, we can now set up
-					 * yy_c_buf_p so that if some total
-					 * hoser (like flex itself) wants to
-					 * call the scanner after we return the
-					 * YY_NULL, it'll still work - another
-					 * YY_NULL will get returned.
-					 */
-					(yy_c_buf_p) = (yytext_ptr) + YY_MORE_ADJ;
-
-					yy_act = YY_STATE_EOF(YY_START);
-					goto do_action;
-					}
-
-				else
-					{
-					if ( ! (yy_did_buffer_switch_on_eof) )
-						YY_NEW_FILE;
-					}
-				break;
-				}
-
-			case EOB_ACT_CONTINUE_SCAN:
-				(yy_c_buf_p) =
-					(yytext_ptr) + yy_amount_of_matched_text;
-
-				yy_current_state = yy_get_previous_state(  );
-
-				yy_cp = (yy_c_buf_p);
-				yy_bp = (yytext_ptr) + YY_MORE_ADJ;
-				goto yy_match;
-
-			case EOB_ACT_LAST_MATCH:
-				(yy_c_buf_p) =
-				&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)];
-
-				yy_current_state = yy_get_previous_state(  );
-
-				yy_cp = (yy_c_buf_p);
-				yy_bp = (yytext_ptr) + YY_MORE_ADJ;
-				goto yy_find_action;
-			}
-		break;
-		}
-
-	default:
-		YY_FATAL_ERROR(
-			"fatal flex scanner internal error--no action found" );
-	} /* end of action switch */
-		} /* end of scanning one token */
-} /* end of zconflex */
-
-/* yy_get_next_buffer - try to read in a new buffer
- *
- * Returns a code representing an action:
- *	EOB_ACT_LAST_MATCH -
- *	EOB_ACT_CONTINUE_SCAN - continue scanning from current position
- *	EOB_ACT_END_OF_FILE - end of file
- */
-static int yy_get_next_buffer (void)
-{
-    	register char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf;
-	register char *source = (yytext_ptr);
-	register int number_to_move, i;
-	int ret_val;
-
-	if ( (yy_c_buf_p) > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] )
-		YY_FATAL_ERROR(
-		"fatal flex scanner internal error--end of buffer missed" );
-
-	if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 )
-		{ /* Don't try to fill the buffer, so this is an EOF. */
-		if ( (yy_c_buf_p) - (yytext_ptr) - YY_MORE_ADJ == 1 )
-			{
-			/* We matched a single character, the EOB, so
-			 * treat this as a final EOF.
-			 */
-			return EOB_ACT_END_OF_FILE;
-			}
-
-		else
-			{
-			/* We matched some text prior to the EOB, first
-			 * process it.
-			 */
-			return EOB_ACT_LAST_MATCH;
-			}
-		}
-
-	/* Try to read more data. */
-
-	/* First move last chars to start of buffer. */
-	number_to_move = (int) ((yy_c_buf_p) - (yytext_ptr)) - 1;
-
-	for ( i = 0; i < number_to_move; ++i )
-		*(dest++) = *(source++);
-
-	if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING )
-		/* don't do the read, it's not guaranteed to return an EOF,
-		 * just force an EOF
-		 */
-		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars) = 0;
-
-	else
-		{
-			int num_to_read =
-			YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1;
-
-		while ( num_to_read <= 0 )
-			{ /* Not enough room in the buffer - grow it. */
-
-			/* just a shorter name for the current buffer */
-			YY_BUFFER_STATE b = YY_CURRENT_BUFFER;
-
-			int yy_c_buf_p_offset =
-				(int) ((yy_c_buf_p) - b->yy_ch_buf);
-
-			if ( b->yy_is_our_buffer )
-				{
-				int new_size = b->yy_buf_size * 2;
-
-				if ( new_size <= 0 )
-					b->yy_buf_size += b->yy_buf_size / 8;
-				else
-					b->yy_buf_size *= 2;
-
-				b->yy_ch_buf = (char *)
-					/* Include room in for 2 EOB chars. */
-					zconfrealloc((void *) b->yy_ch_buf,b->yy_buf_size + 2  );
-				}
-			else
-				/* Can't grow it, we don't own it. */
-				b->yy_ch_buf = 0;
-
-			if ( ! b->yy_ch_buf )
-				YY_FATAL_ERROR(
-				"fatal error - scanner input buffer overflow" );
-
-			(yy_c_buf_p) = &b->yy_ch_buf[yy_c_buf_p_offset];
-
-			num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size -
-						number_to_move - 1;
-
-			}
-
-		if ( num_to_read > YY_READ_BUF_SIZE )
-			num_to_read = YY_READ_BUF_SIZE;
-
-		/* Read in more data. */
-		YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]),
-			(yy_n_chars), (size_t) num_to_read );
-
-		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
-		}
-
-	if ( (yy_n_chars) == 0 )
-		{
-		if ( number_to_move == YY_MORE_ADJ )
-			{
-			ret_val = EOB_ACT_END_OF_FILE;
-			zconfrestart(zconfin  );
-			}
-
-		else
-			{
-			ret_val = EOB_ACT_LAST_MATCH;
-			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status =
-				YY_BUFFER_EOF_PENDING;
-			}
-		}
-
-	else
-		ret_val = EOB_ACT_CONTINUE_SCAN;
-
-	if ((yy_size_t) ((yy_n_chars) + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) {
-		/* Extend the array by 50%, plus the number we really need. */
-		yy_size_t new_size = (yy_n_chars) + number_to_move + ((yy_n_chars) >> 1);
-		YY_CURRENT_BUFFER_LVALUE->yy_ch_buf = (char *) zconfrealloc((void *) YY_CURRENT_BUFFER_LVALUE->yy_ch_buf,new_size  );
-		if ( ! YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )
-			YY_FATAL_ERROR( "out of dynamic memory in yy_get_next_buffer()" );
-	}
-
-	(yy_n_chars) += number_to_move;
-	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] = YY_END_OF_BUFFER_CHAR;
-	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] = YY_END_OF_BUFFER_CHAR;
-
-	(yytext_ptr) = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0];
-
-	return ret_val;
-}
-
-/* yy_get_previous_state - get the state just before the EOB char was reached */
-
-    static yy_state_type yy_get_previous_state (void)
-{
-	register yy_state_type yy_current_state;
-	register char *yy_cp;
-    
-	yy_current_state = (yy_start);
-
-	for ( yy_cp = (yytext_ptr) + YY_MORE_ADJ; yy_cp < (yy_c_buf_p); ++yy_cp )
-		{
-		yy_current_state = yy_nxt[yy_current_state][(*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1)];
-		}
-
-	return yy_current_state;
-}
-
-/* yy_try_NUL_trans - try to make a transition on the NUL character
- *
- * synopsis
- *	next_state = yy_try_NUL_trans( current_state );
- */
-    static yy_state_type yy_try_NUL_trans  (yy_state_type yy_current_state )
-{
-	register int yy_is_jam;
-    
-	yy_current_state = yy_nxt[yy_current_state][1];
-	yy_is_jam = (yy_current_state <= 0);
-
-	return yy_is_jam ? 0 : yy_current_state;
-}
-
-    static void yyunput (int c, register char * yy_bp )
-{
-	register char *yy_cp;
-    
-    yy_cp = (yy_c_buf_p);
-
-	/* undo effects of setting up zconftext */
-	*yy_cp = (yy_hold_char);
-
-	if ( yy_cp < YY_CURRENT_BUFFER_LVALUE->yy_ch_buf + 2 )
-		{ /* need to shift things up to make room */
-		/* +2 for EOB chars. */
-		register int number_to_move = (yy_n_chars) + 2;
-		register char *dest = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[
-					YY_CURRENT_BUFFER_LVALUE->yy_buf_size + 2];
-		register char *source =
-				&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move];
-
-		while ( source > YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )
-			*--dest = *--source;
-
-		yy_cp += (int) (dest - source);
-		yy_bp += (int) (dest - source);
-		YY_CURRENT_BUFFER_LVALUE->yy_n_chars =
-			(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_buf_size;
-
-		if ( yy_cp < YY_CURRENT_BUFFER_LVALUE->yy_ch_buf + 2 )
-			YY_FATAL_ERROR( "flex scanner push-back overflow" );
-		}
-
-	*--yy_cp = (char) c;
-
-	(yytext_ptr) = yy_bp;
-	(yy_hold_char) = *yy_cp;
-	(yy_c_buf_p) = yy_cp;
-}
-
-#ifndef YY_NO_INPUT
-#ifdef __cplusplus
-    static int yyinput (void)
-#else
-    static int input  (void)
-#endif
-
-{
-	int c;
-    
-	*(yy_c_buf_p) = (yy_hold_char);
-
-	if ( *(yy_c_buf_p) == YY_END_OF_BUFFER_CHAR )
-		{
-		/* yy_c_buf_p now points to the character we want to return.
-		 * If this occurs *before* the EOB characters, then it's a
-		 * valid NUL; if not, then we've hit the end of the buffer.
-		 */
-		if ( (yy_c_buf_p) < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
-			/* This was really a NUL. */
-			*(yy_c_buf_p) = '\0';
-
-		else
-			{ /* need more input */
-			int offset = (yy_c_buf_p) - (yytext_ptr);
-			++(yy_c_buf_p);
-
-			switch ( yy_get_next_buffer(  ) )
-				{
-				case EOB_ACT_LAST_MATCH:
-					/* This happens because yy_g_n_b()
-					 * sees that we've accumulated a
-					 * token and flags that we need to
-					 * try matching the token before
-					 * proceeding.  But for input(),
-					 * there's no matching to consider.
-					 * So convert the EOB_ACT_LAST_MATCH
-					 * to EOB_ACT_END_OF_FILE.
-					 */
-
-					/* Reset buffer status. */
-					zconfrestart(zconfin );
-
-					/*FALLTHROUGH*/
-
-				case EOB_ACT_END_OF_FILE:
-					{
-					if ( zconfwrap( ) )
-						return EOF;
-
-					if ( ! (yy_did_buffer_switch_on_eof) )
-						YY_NEW_FILE;
-#ifdef __cplusplus
-					return yyinput();
-#else
-					return input();
-#endif
-					}
-
-				case EOB_ACT_CONTINUE_SCAN:
-					(yy_c_buf_p) = (yytext_ptr) + offset;
-					break;
-				}
-			}
-		}
-
-	c = *(unsigned char *) (yy_c_buf_p);	/* cast for 8-bit char's */
-	*(yy_c_buf_p) = '\0';	/* preserve zconftext */
-	(yy_hold_char) = *++(yy_c_buf_p);
-
-	return c;
-}
-#endif	/* ifndef YY_NO_INPUT */
-
-/** Immediately switch to a different input stream.
- * @param input_file A readable stream.
- * 
- * @note This function does not reset the start condition to @c INITIAL .
- */
-    void zconfrestart  (FILE * input_file )
-{
-    
-	if ( ! YY_CURRENT_BUFFER ){
-        zconfensure_buffer_stack ();
-		YY_CURRENT_BUFFER_LVALUE =
-            zconf_create_buffer(zconfin,YY_BUF_SIZE );
-	}
-
-	zconf_init_buffer(YY_CURRENT_BUFFER,input_file );
-	zconf_load_buffer_state( );
-}
-
-/** Switch to a different input buffer.
- * @param new_buffer The new input buffer.
- * 
- */
-    void zconf_switch_to_buffer  (YY_BUFFER_STATE  new_buffer )
-{
-    
-	/* TODO. We should be able to replace this entire function body
-	 * with
-	 *		zconfpop_buffer_state();
-	 *		zconfpush_buffer_state(new_buffer);
-     */
-	zconfensure_buffer_stack ();
-	if ( YY_CURRENT_BUFFER == new_buffer )
-		return;
-
-	if ( YY_CURRENT_BUFFER )
-		{
-		/* Flush out information for old buffer. */
-		*(yy_c_buf_p) = (yy_hold_char);
-		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
-		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
-		}
-
-	YY_CURRENT_BUFFER_LVALUE = new_buffer;
-	zconf_load_buffer_state( );
-
-	/* We don't actually know whether we did this switch during
-	 * EOF (zconfwrap()) processing, but the only time this flag
-	 * is looked at is after zconfwrap() is called, so it's safe
-	 * to go ahead and always set it.
-	 */
-	(yy_did_buffer_switch_on_eof) = 1;
-}
-
-static void zconf_load_buffer_state  (void)
-{
-    	(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
-	(yytext_ptr) = (yy_c_buf_p) = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos;
-	zconfin = YY_CURRENT_BUFFER_LVALUE->yy_input_file;
-	(yy_hold_char) = *(yy_c_buf_p);
-}
-
-/** Allocate and initialize an input buffer state.
- * @param file A readable stream.
- * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE.
- * 
- * @return the allocated buffer state.
- */
-    YY_BUFFER_STATE zconf_create_buffer  (FILE * file, int  size )
-{
-	YY_BUFFER_STATE b;
-    
-	b = (YY_BUFFER_STATE) zconfalloc(sizeof( struct yy_buffer_state )  );
-	if ( ! b )
-		YY_FATAL_ERROR( "out of dynamic memory in zconf_create_buffer()" );
-
-	b->yy_buf_size = size;
-
-	/* yy_ch_buf has to be 2 characters longer than the size given because
-	 * we need to put in 2 end-of-buffer characters.
-	 */
-	b->yy_ch_buf = (char *) zconfalloc(b->yy_buf_size + 2  );
-	if ( ! b->yy_ch_buf )
-		YY_FATAL_ERROR( "out of dynamic memory in zconf_create_buffer()" );
-
-	b->yy_is_our_buffer = 1;
-
-	zconf_init_buffer(b,file );
-
-	return b;
-}
-
-/** Destroy the buffer.
- * @param b a buffer created with zconf_create_buffer()
- * 
- */
-    void zconf_delete_buffer (YY_BUFFER_STATE  b )
-{
-    
-	if ( ! b )
-		return;
-
-	if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */
-		YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0;
-
-	if ( b->yy_is_our_buffer )
-		zconffree((void *) b->yy_ch_buf  );
-
-	zconffree((void *) b  );
-}
-
-/* Initializes or reinitializes a buffer.
- * This function is sometimes called more than once on the same buffer,
- * such as during a zconfrestart() or at EOF.
- */
-    static void zconf_init_buffer  (YY_BUFFER_STATE  b, FILE * file )
-
-{
-	int oerrno = errno;
-    
-	zconf_flush_buffer(b );
-
-	b->yy_input_file = file;
-	b->yy_fill_buffer = 1;
-
-    /* If b is the current buffer, then zconf_init_buffer was _probably_
-     * called from zconfrestart() or through yy_get_next_buffer.
-     * In that case, we don't want to reset the lineno or column.
-     */
-    if (b != YY_CURRENT_BUFFER){
-        b->yy_bs_lineno = 1;
-        b->yy_bs_column = 0;
-    }
-
-        b->yy_is_interactive = 0;
-    
-	errno = oerrno;
-}
-
-/** Discard all buffered characters. On the next scan, YY_INPUT will be called.
- * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER.
- * 
- */
-    void zconf_flush_buffer (YY_BUFFER_STATE  b )
-{
-    	if ( ! b )
-		return;
-
-	b->yy_n_chars = 0;
-
-	/* We always need two end-of-buffer characters.  The first causes
-	 * a transition to the end-of-buffer state.  The second causes
-	 * a jam in that state.
-	 */
-	b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
-	b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;
-
-	b->yy_buf_pos = &b->yy_ch_buf[0];
-
-	b->yy_at_bol = 1;
-	b->yy_buffer_status = YY_BUFFER_NEW;
-
-	if ( b == YY_CURRENT_BUFFER )
-		zconf_load_buffer_state( );
-}
-
-/** Pushes the new state onto the stack. The new state becomes
- *  the current state. This function will allocate the stack
- *  if necessary.
- *  @param new_buffer The new state.
- *  
- */
-void zconfpush_buffer_state (YY_BUFFER_STATE new_buffer )
-{
-    	if (new_buffer == NULL)
-		return;
-
-	zconfensure_buffer_stack();
-
-	/* This block is copied from zconf_switch_to_buffer. */
-	if ( YY_CURRENT_BUFFER )
-		{
-		/* Flush out information for old buffer. */
-		*(yy_c_buf_p) = (yy_hold_char);
-		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
-		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
-		}
-
-	/* Only push if top exists. Otherwise, replace top. */
-	if (YY_CURRENT_BUFFER)
-		(yy_buffer_stack_top)++;
-	YY_CURRENT_BUFFER_LVALUE = new_buffer;
-
-	/* copied from zconf_switch_to_buffer. */
-	zconf_load_buffer_state( );
-	(yy_did_buffer_switch_on_eof) = 1;
-}
-
-/** Removes and deletes the top of the stack, if present.
- *  The next element becomes the new top.
- *  
- */
-void zconfpop_buffer_state (void)
-{
-    	if (!YY_CURRENT_BUFFER)
-		return;
-
-	zconf_delete_buffer(YY_CURRENT_BUFFER );
-	YY_CURRENT_BUFFER_LVALUE = NULL;
-	if ((yy_buffer_stack_top) > 0)
-		--(yy_buffer_stack_top);
-
-	if (YY_CURRENT_BUFFER) {
-		zconf_load_buffer_state( );
-		(yy_did_buffer_switch_on_eof) = 1;
-	}
-}
-
-/* Allocates the stack if it does not exist.
- *  Guarantees space for at least one push.
- */
-static void zconfensure_buffer_stack (void)
-{
-	int num_to_alloc;
-    
-	if (!(yy_buffer_stack)) {
-
-		/* First allocation is just for 2 elements, since we don't know if this
-		 * scanner will even need a stack. We use 2 instead of 1 to avoid an
-		 * immediate realloc on the next call.
-         */
-		num_to_alloc = 1;
-		(yy_buffer_stack) = (struct yy_buffer_state**)zconfalloc
-								(num_to_alloc * sizeof(struct yy_buffer_state*)
-								);
-		if ( ! (yy_buffer_stack) )
-			YY_FATAL_ERROR( "out of dynamic memory in zconfensure_buffer_stack()" );
-								  
-		memset((yy_buffer_stack), 0, num_to_alloc * sizeof(struct yy_buffer_state*));
-				
-		(yy_buffer_stack_max) = num_to_alloc;
-		(yy_buffer_stack_top) = 0;
-		return;
-	}
-
-	if ((yy_buffer_stack_top) >= ((yy_buffer_stack_max)) - 1){
-
-		/* Increase the buffer to prepare for a possible push. */
-		int grow_size = 8 /* arbitrary grow size */;
-
-		num_to_alloc = (yy_buffer_stack_max) + grow_size;
-		(yy_buffer_stack) = (struct yy_buffer_state**)zconfrealloc
-								((yy_buffer_stack),
-								num_to_alloc * sizeof(struct yy_buffer_state*)
-								);
-		if ( ! (yy_buffer_stack) )
-			YY_FATAL_ERROR( "out of dynamic memory in zconfensure_buffer_stack()" );
-
-		/* zero only the new slots.*/
-		memset((yy_buffer_stack) + (yy_buffer_stack_max), 0, grow_size * sizeof(struct yy_buffer_state*));
-		(yy_buffer_stack_max) = num_to_alloc;
-	}
-}
-
-/** Setup the input buffer state to scan directly from a user-specified character buffer.
- * @param base the character buffer
- * @param size the size in bytes of the character buffer
- * 
- * @return the newly allocated buffer state object. 
- */
-YY_BUFFER_STATE zconf_scan_buffer  (char * base, yy_size_t  size )
-{
-	YY_BUFFER_STATE b;
-    
-	if ( size < 2 ||
-	     base[size-2] != YY_END_OF_BUFFER_CHAR ||
-	     base[size-1] != YY_END_OF_BUFFER_CHAR )
-		/* They forgot to leave room for the EOB's. */
-		return 0;
-
-	b = (YY_BUFFER_STATE) zconfalloc(sizeof( struct yy_buffer_state )  );
-	if ( ! b )
-		YY_FATAL_ERROR( "out of dynamic memory in zconf_scan_buffer()" );
-
-	b->yy_buf_size = size - 2;	/* "- 2" to take care of EOB's */
-	b->yy_buf_pos = b->yy_ch_buf = base;
-	b->yy_is_our_buffer = 0;
-	b->yy_input_file = 0;
-	b->yy_n_chars = b->yy_buf_size;
-	b->yy_is_interactive = 0;
-	b->yy_at_bol = 1;
-	b->yy_fill_buffer = 0;
-	b->yy_buffer_status = YY_BUFFER_NEW;
-
-	zconf_switch_to_buffer(b  );
-
-	return b;
-}
-
-/** Setup the input buffer state to scan a string. The next call to zconflex() will
- * scan from a @e copy of @a str.
- * @param yystr a NUL-terminated string to scan
- * 
- * @return the newly allocated buffer state object.
- * @note If you want to scan bytes that may contain NUL values, then use
- *       zconf_scan_bytes() instead.
- */
-YY_BUFFER_STATE zconf_scan_string (yyconst char * yystr )
-{
-    
-	return zconf_scan_bytes(yystr,strlen(yystr) );
-}
-
-/** Setup the input buffer state to scan the given bytes. The next call to zconflex() will
- * scan from a @e copy of @a bytes.
- * @param yybytes the byte buffer to scan
- * @param _yybytes_len the number of bytes in the buffer pointed to by @a bytes.
- * 
- * @return the newly allocated buffer state object.
- */
-YY_BUFFER_STATE zconf_scan_bytes  (yyconst char * yybytes, int  _yybytes_len )
-{
-	YY_BUFFER_STATE b;
-	char *buf;
-	yy_size_t n;
-	int i;
-    
-	/* Get memory for full buffer, including space for trailing EOB's. */
-	n = _yybytes_len + 2;
-	buf = (char *) zconfalloc(n  );
-	if ( ! buf )
-		YY_FATAL_ERROR( "out of dynamic memory in zconf_scan_bytes()" );
-
-	for ( i = 0; i < _yybytes_len; ++i )
-		buf[i] = yybytes[i];
-
-	buf[_yybytes_len] = buf[_yybytes_len+1] = YY_END_OF_BUFFER_CHAR;
-
-	b = zconf_scan_buffer(buf,n );
-	if ( ! b )
-		YY_FATAL_ERROR( "bad buffer in zconf_scan_bytes()" );
-
-	/* It's okay to grow etc. this buffer, and we should throw it
-	 * away when we're done.
-	 */
-	b->yy_is_our_buffer = 1;
-
-	return b;
-}
-
-#ifndef YY_EXIT_FAILURE
-#define YY_EXIT_FAILURE 2
-#endif
-
-static void yy_fatal_error (yyconst char* msg )
-{
-    	(void) fprintf( stderr, "%s\n", msg );
-	exit( YY_EXIT_FAILURE );
-}
-
-/* Redefine yyless() so it works in section 3 code. */
-
-#undef yyless
-#define yyless(n) \
-	do \
-		{ \
-		/* Undo effects of setting up zconftext. */ \
-        int yyless_macro_arg = (n); \
-        YY_LESS_LINENO(yyless_macro_arg);\
-		zconftext[zconfleng] = (yy_hold_char); \
-		(yy_c_buf_p) = zconftext + yyless_macro_arg; \
-		(yy_hold_char) = *(yy_c_buf_p); \
-		*(yy_c_buf_p) = '\0'; \
-		zconfleng = yyless_macro_arg; \
-		} \
-	while ( 0 )
-
-/* Accessor  methods (get/set functions) to struct members. */
-
-/** Get the current line number.
- * 
- */
-int zconfget_lineno  (void)
-{
-        
-    return zconflineno;
-}
-
-/** Get the input stream.
- * 
- */
-FILE *zconfget_in  (void)
-{
-        return zconfin;
-}
-
-/** Get the output stream.
- * 
- */
-FILE *zconfget_out  (void)
-{
-        return zconfout;
-}
-
-/** Get the length of the current token.
- * 
- */
-int zconfget_leng  (void)
-{
-        return zconfleng;
-}
-
-/** Get the current token.
- * 
- */
-
-char *zconfget_text  (void)
-{
-        return zconftext;
-}
-
-/** Set the current line number.
- * @param line_number
- * 
- */
-void zconfset_lineno (int  line_number )
-{
-    
-    zconflineno = line_number;
-}
-
-/** Set the input stream. This does not discard the current
- * input buffer.
- * @param in_str A readable stream.
- * 
- * @see zconf_switch_to_buffer
- */
-void zconfset_in (FILE *  in_str )
-{
-        zconfin = in_str ;
-}
-
-void zconfset_out (FILE *  out_str )
-{
-        zconfout = out_str ;
-}
-
-int zconfget_debug  (void)
-{
-        return zconf_flex_debug;
-}
-
-void zconfset_debug (int  bdebug )
-{
-        zconf_flex_debug = bdebug ;
-}
-
-static int yy_init_globals (void)
-{
-        /* Initialization is the same as for the non-reentrant scanner.
-     * This function is called from zconflex_destroy(), so don't allocate here.
-     */
-
-    (yy_buffer_stack) = 0;
-    (yy_buffer_stack_top) = 0;
-    (yy_buffer_stack_max) = 0;
-    (yy_c_buf_p) = (char *) 0;
-    (yy_init) = 0;
-    (yy_start) = 0;
-
-/* Defined in main.c */
-#ifdef YY_STDINIT
-    zconfin = stdin;
-    zconfout = stdout;
-#else
-    zconfin = (FILE *) 0;
-    zconfout = (FILE *) 0;
-#endif
-
-    /* For future reference: Set errno on error, since we are called by
-     * zconflex_init()
-     */
-    return 0;
-}
-
-/* zconflex_destroy is for both reentrant and non-reentrant scanners. */
-int zconflex_destroy  (void)
-{
-    
-    /* Pop the buffer stack, destroying each element. */
-	while(YY_CURRENT_BUFFER){
-		zconf_delete_buffer(YY_CURRENT_BUFFER  );
-		YY_CURRENT_BUFFER_LVALUE = NULL;
-		zconfpop_buffer_state();
-	}
-
-	/* Destroy the stack itself. */
-	zconffree((yy_buffer_stack) );
-	(yy_buffer_stack) = NULL;
-
-    /* Reset the globals. This is important in a non-reentrant scanner so the next time
-     * zconflex() is called, initialization will occur. */
-    yy_init_globals( );
-
-    return 0;
-}
-
-/*
- * Internal utility routines.
- */
-
-#ifndef yytext_ptr
-static void yy_flex_strncpy (char* s1, yyconst char * s2, int n )
-{
-	register int i;
-	for ( i = 0; i < n; ++i )
-		s1[i] = s2[i];
-}
-#endif
-
-#ifdef YY_NEED_STRLEN
-static int yy_flex_strlen (yyconst char * s )
-{
-	register int n;
-	for ( n = 0; s[n]; ++n )
-		;
-
-	return n;
-}
-#endif
-
-void *zconfalloc (yy_size_t  size )
-{
-	return (void *) malloc( size );
-}
-
-void *zconfrealloc  (void * ptr, yy_size_t  size )
-{
-	/* The cast to (char *) in the following accommodates both
-	 * implementations that use char* generic pointers, and those
-	 * that use void* generic pointers.  It works with the latter
-	 * because both ANSI C and C++ allow castless assignment from
-	 * any pointer type to void*, and deal with argument conversions
-	 * as though doing an assignment.
-	 */
-	return (void *) realloc( (char *) ptr, size );
-}
-
-void zconffree (void * ptr )
-{
-	free( (char *) ptr );	/* see zconfrealloc() for (char *) cast */
-}
-
-#define YYTABLES_NAME "yytables"
-
-void zconf_starthelp(void)
-{
-	new_string();
-	last_ts = first_ts = 0;
-	BEGIN(HELP);
-}
-
-static void zconf_endhelp(void)
-{
-	zconflval.string = text;
-	BEGIN(INITIAL);
-}
-
-/*
- * Try to open specified file with following names:
- * ./name
- * $(srctree)/name
- * The latter is used when srctree is separate from objtree
- * when compiling the kernel.
- * Return NULL if file is not found.
- */
-FILE *zconf_fopen(const char *name)
-{
-	char *env, fullname[PATH_MAX+1];
-	FILE *f;
-
-	f = fopen(name, "r");
-	if (!f && name != NULL && name[0] != '/') {
-		env = getenv(SRCTREE);
-		if (env) {
-			sprintf(fullname, "%s/%s", env, name);
-			f = fopen(fullname, "r");
-		}
-	}
-	return f;
-}
-
-void zconf_initscan(const char *name)
-{
-	zconfin = zconf_fopen(name);
-	if (!zconfin) {
-		printf("can't find file %s\n", name);
-		exit(1);
-	}
-
-	current_buf = xmalloc(sizeof(*current_buf));
-	memset(current_buf, 0, sizeof(*current_buf));
-
-	current_file = file_lookup(name);
-	current_file->lineno = 1;
-}
-
-void zconf_nextfile(const char *name)
-{
-	struct file *iter;
-	struct file *file = file_lookup(name);
-	struct buffer *buf = xmalloc(sizeof(*buf));
-	memset(buf, 0, sizeof(*buf));
-
-	current_buf->state = YY_CURRENT_BUFFER;
-	zconfin = zconf_fopen(file->name);
-	if (!zconfin) {
-		printf("%s:%d: can't open file \"%s\"\n",
-		    zconf_curname(), zconf_lineno(), file->name);
-		exit(1);
-	}
-	zconf_switch_to_buffer(zconf_create_buffer(zconfin,YY_BUF_SIZE));
-	buf->parent = current_buf;
-	current_buf = buf;
-
-	for (iter = current_file->parent; iter; iter = iter->parent ) {
-		if (!strcmp(current_file->name,iter->name) ) {
-			printf("%s:%d: recursive inclusion detected. "
-			       "Inclusion path:\n  current file : '%s'\n",
-			       zconf_curname(), zconf_lineno(),
-			       zconf_curname());
-			iter = current_file->parent;
-			while (iter && \
-			       strcmp(iter->name,current_file->name)) {
-				printf("  included from: '%s:%d'\n",
-				       iter->name, iter->lineno-1);
-				iter = iter->parent;
-			}
-			if (iter)
-				printf("  included from: '%s:%d'\n",
-				       iter->name, iter->lineno+1);
-			exit(1);
-		}
-	}
-	file->lineno = 1;
-	file->parent = current_file;
-	current_file = file;
-}
-
-static void zconf_endfile(void)
-{
-	struct buffer *parent;
-
-	current_file = current_file->parent;
-
-	parent = current_buf->parent;
-	if (parent) {
-		fclose(zconfin);
-		zconf_delete_buffer(YY_CURRENT_BUFFER);
-		zconf_switch_to_buffer(parent->state);
-	}
-	free(current_buf);
-	current_buf = parent;
-}
-
-int zconf_lineno(void)
-{
-	return current_pos.lineno;
-}
-
-const char *zconf_curname(void)
-{
-	return current_pos.file ? current_pos.file->name : "<none>";
-}
-
diff --git a/xen/tools/kconfig/zconf.tab.c_shipped b/xen/tools/kconfig/zconf.tab.c_shipped
deleted file mode 100644
index 0f1661d7b8d5..000000000000
--- a/xen/tools/kconfig/zconf.tab.c_shipped
+++ /dev/null
@@ -1,2580 +0,0 @@ 
-/* A Bison parser, made by GNU Bison 2.5.1.  */
-
-/* Bison implementation for Yacc-like parsers in C
-   
-      Copyright (C) 1984, 1989-1990, 2000-2012 Free Software Foundation, Inc.
-   
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* As a special exception, you may create a larger work that contains
-   part or all of the Bison parser skeleton and distribute that work
-   under terms of your choice, so long as that work isn't itself a
-   parser generator using the skeleton or a modified version thereof
-   as a parser skeleton.  Alternatively, if you modify or redistribute
-   the parser skeleton itself, you may (at your option) remove this
-   special exception, which will cause the skeleton and the resulting
-   Bison output files to be licensed under the GNU General Public
-   License without this special exception.
-   
-   This special exception was added by the Free Software Foundation in
-   version 2.2 of Bison.  */
-
-/* C LALR(1) parser skeleton written by Richard Stallman, by
-   simplifying the original so-called "semantic" parser.  */
-
-/* All symbols defined below should begin with yy or YY, to avoid
-   infringing on user name space.  This should be done even for local
-   variables, as they might otherwise be expanded by user macros.
-   There are some unavoidable exceptions within include files to
-   define necessary library symbols; they are noted "INFRINGES ON
-   USER NAME SPACE" below.  */
-
-/* Identify Bison output.  */
-#define YYBISON 1
-
-/* Bison version.  */
-#define YYBISON_VERSION "2.5.1"
-
-/* Skeleton name.  */
-#define YYSKELETON_NAME "yacc.c"
-
-/* Pure parsers.  */
-#define YYPURE 0
-
-/* Push parsers.  */
-#define YYPUSH 0
-
-/* Pull parsers.  */
-#define YYPULL 1
-
-/* Using locations.  */
-#define YYLSP_NEEDED 0
-
-/* Substitute the variable and function names.  */
-#define yyparse         zconfparse
-#define yylex           zconflex
-#define yyerror         zconferror
-#define yylval          zconflval
-#define yychar          zconfchar
-#define yydebug         zconfdebug
-#define yynerrs         zconfnerrs
-
-
-/* Copy the first part of user declarations.  */
-
-
-/*
- * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
- * Released under the terms of the GNU GPL v2.0.
- */
-
-#include <ctype.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdbool.h>
-
-#include "lkc.h"
-
-#define printd(mask, fmt...) if (cdebug & (mask)) printf(fmt)
-
-#define PRINTD		0x0001
-#define DEBUG_PARSE	0x0002
-
-int cdebug = PRINTD;
-
-extern int zconflex(void);
-static void zconfprint(const char *err, ...);
-static void zconf_error(const char *err, ...);
-static void zconferror(const char *err);
-static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int endtoken);
-
-struct symbol *symbol_hash[SYMBOL_HASHSIZE];
-
-static struct menu *current_menu, *current_entry;
-
-
-
-
-# ifndef YY_NULL
-#  if defined __cplusplus && 201103L <= __cplusplus
-#   define YY_NULL nullptr
-#  else
-#   define YY_NULL 0
-#  endif
-# endif
-
-/* Enabling traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG 1
-#endif
-
-/* Enabling verbose error messages.  */
-#ifdef YYERROR_VERBOSE
-# undef YYERROR_VERBOSE
-# define YYERROR_VERBOSE 1
-#else
-# define YYERROR_VERBOSE 0
-#endif
-
-/* Enabling the token table.  */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE 0
-#endif
-
-
-/* Tokens.  */
-#ifndef YYTOKENTYPE
-# define YYTOKENTYPE
-   /* Put the tokens into the symbol table, so that GDB and other debuggers
-      know about them.  */
-   enum yytokentype {
-     T_MAINMENU = 258,
-     T_MENU = 259,
-     T_ENDMENU = 260,
-     T_SOURCE = 261,
-     T_CHOICE = 262,
-     T_ENDCHOICE = 263,
-     T_COMMENT = 264,
-     T_CONFIG = 265,
-     T_MENUCONFIG = 266,
-     T_HELP = 267,
-     T_HELPTEXT = 268,
-     T_IF = 269,
-     T_ENDIF = 270,
-     T_DEPENDS = 271,
-     T_OPTIONAL = 272,
-     T_PROMPT = 273,
-     T_TYPE = 274,
-     T_DEFAULT = 275,
-     T_SELECT = 276,
-     T_RANGE = 277,
-     T_VISIBLE = 278,
-     T_OPTION = 279,
-     T_ON = 280,
-     T_WORD = 281,
-     T_WORD_QUOTE = 282,
-     T_UNEQUAL = 283,
-     T_LESS = 284,
-     T_LESS_EQUAL = 285,
-     T_GREATER = 286,
-     T_GREATER_EQUAL = 287,
-     T_CLOSE_PAREN = 288,
-     T_OPEN_PAREN = 289,
-     T_EOL = 290,
-     T_OR = 291,
-     T_AND = 292,
-     T_EQUAL = 293,
-     T_NOT = 294
-   };
-#endif
-
-
-
-#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-typedef union YYSTYPE
-{
-
-
-	char *string;
-	struct file *file;
-	struct symbol *symbol;
-	struct expr *expr;
-	struct menu *menu;
-	const struct kconf_id *id;
-
-
-
-} YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
-# define YYSTYPE_IS_DECLARED 1
-#endif
-
-
-/* Copy the second part of user declarations.  */
-
-
-/* Include zconf.hash.c here so it can see the token constants. */
-#include "zconf.hash.c"
-
-
-
-#ifdef short
-# undef short
-#endif
-
-#ifdef YYTYPE_UINT8
-typedef YYTYPE_UINT8 yytype_uint8;
-#else
-typedef unsigned char yytype_uint8;
-#endif
-
-#ifdef YYTYPE_INT8
-typedef YYTYPE_INT8 yytype_int8;
-#elif (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-typedef signed char yytype_int8;
-#else
-typedef short int yytype_int8;
-#endif
-
-#ifdef YYTYPE_UINT16
-typedef YYTYPE_UINT16 yytype_uint16;
-#else
-typedef unsigned short int yytype_uint16;
-#endif
-
-#ifdef YYTYPE_INT16
-typedef YYTYPE_INT16 yytype_int16;
-#else
-typedef short int yytype_int16;
-#endif
-
-#ifndef YYSIZE_T
-# ifdef __SIZE_TYPE__
-#  define YYSIZE_T __SIZE_TYPE__
-# elif defined size_t
-#  define YYSIZE_T size_t
-# elif ! defined YYSIZE_T && (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-#  include <stddef.h> /* INFRINGES ON USER NAME SPACE */
-#  define YYSIZE_T size_t
-# else
-#  define YYSIZE_T unsigned int
-# endif
-#endif
-
-#define YYSIZE_MAXIMUM ((YYSIZE_T) -1)
-
-#ifndef YY_
-# if defined YYENABLE_NLS && YYENABLE_NLS
-#  if ENABLE_NLS
-#   include <libintl.h> /* INFRINGES ON USER NAME SPACE */
-#   define YY_(msgid) dgettext ("bison-runtime", msgid)
-#  endif
-# endif
-# ifndef YY_
-#  define YY_(msgid) msgid
-# endif
-#endif
-
-/* Suppress unused-variable warnings by "using" E.  */
-#if ! defined lint || defined __GNUC__
-# define YYUSE(e) ((void) (e))
-#else
-# define YYUSE(e) /* empty */
-#endif
-
-/* Identity function, used to suppress warnings about constant conditions.  */
-#ifndef lint
-# define YYID(n) (n)
-#else
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static int
-YYID (int yyi)
-#else
-static int
-YYID (yyi)
-    int yyi;
-#endif
-{
-  return yyi;
-}
-#endif
-
-#if ! defined yyoverflow || YYERROR_VERBOSE
-
-/* The parser invokes alloca or malloc; define the necessary symbols.  */
-
-# ifdef YYSTACK_USE_ALLOCA
-#  if YYSTACK_USE_ALLOCA
-#   ifdef __GNUC__
-#    define YYSTACK_ALLOC __builtin_alloca
-#   elif defined __BUILTIN_VA_ARG_INCR
-#    include <alloca.h> /* INFRINGES ON USER NAME SPACE */
-#   elif defined _AIX
-#    define YYSTACK_ALLOC __alloca
-#   elif defined _MSC_VER
-#    include <malloc.h> /* INFRINGES ON USER NAME SPACE */
-#    define alloca _alloca
-#   else
-#    define YYSTACK_ALLOC alloca
-#    if ! defined _ALLOCA_H && ! defined EXIT_SUCCESS && (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-#     include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
-      /* Use EXIT_SUCCESS as a witness for stdlib.h.  */
-#     ifndef EXIT_SUCCESS
-#      define EXIT_SUCCESS 0
-#     endif
-#    endif
-#   endif
-#  endif
-# endif
-
-# ifdef YYSTACK_ALLOC
-   /* Pacify GCC's `empty if-body' warning.  */
-#  define YYSTACK_FREE(Ptr) do { /* empty */; } while (YYID (0))
-#  ifndef YYSTACK_ALLOC_MAXIMUM
-    /* The OS might guarantee only one guard page at the bottom of the stack,
-       and a page size can be as small as 4096 bytes.  So we cannot safely
-       invoke alloca (N) if N exceeds 4096.  Use a slightly smaller number
-       to allow for a few compiler-allocated temporary stack slots.  */
-#   define YYSTACK_ALLOC_MAXIMUM 4032 /* reasonable circa 2006 */
-#  endif
-# else
-#  define YYSTACK_ALLOC YYMALLOC
-#  define YYSTACK_FREE YYFREE
-#  ifndef YYSTACK_ALLOC_MAXIMUM
-#   define YYSTACK_ALLOC_MAXIMUM YYSIZE_MAXIMUM
-#  endif
-#  if (defined __cplusplus && ! defined EXIT_SUCCESS \
-       && ! ((defined YYMALLOC || defined malloc) \
-	     && (defined YYFREE || defined free)))
-#   include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
-#   ifndef EXIT_SUCCESS
-#    define EXIT_SUCCESS 0
-#   endif
-#  endif
-#  ifndef YYMALLOC
-#   define YYMALLOC malloc
-#   if ! defined malloc && ! defined EXIT_SUCCESS && (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-void *malloc (YYSIZE_T); /* INFRINGES ON USER NAME SPACE */
-#   endif
-#  endif
-#  ifndef YYFREE
-#   define YYFREE free
-#   if ! defined free && ! defined EXIT_SUCCESS && (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-void free (void *); /* INFRINGES ON USER NAME SPACE */
-#   endif
-#  endif
-# endif
-#endif /* ! defined yyoverflow || YYERROR_VERBOSE */
-
-
-#if (! defined yyoverflow \
-     && (! defined __cplusplus \
-	 || (defined YYSTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL)))
-
-/* A type that is properly aligned for any stack member.  */
-union yyalloc
-{
-  yytype_int16 yyss_alloc;
-  YYSTYPE yyvs_alloc;
-};
-
-/* The size of the maximum gap between one aligned stack and the next.  */
-# define YYSTACK_GAP_MAXIMUM (sizeof (union yyalloc) - 1)
-
-/* The size of an array large to enough to hold all stacks, each with
-   N elements.  */
-# define YYSTACK_BYTES(N) \
-     ((N) * (sizeof (yytype_int16) + sizeof (YYSTYPE)) \
-      + YYSTACK_GAP_MAXIMUM)
-
-# define YYCOPY_NEEDED 1
-
-/* Relocate STACK from its old location to the new one.  The
-   local variables YYSIZE and YYSTACKSIZE give the old and new number of
-   elements in the stack, and YYPTR gives the new location of the
-   stack.  Advance YYPTR to a properly aligned location for the next
-   stack.  */
-# define YYSTACK_RELOCATE(Stack_alloc, Stack)				\
-    do									\
-      {									\
-	YYSIZE_T yynewbytes;						\
-	YYCOPY (&yyptr->Stack_alloc, Stack, yysize);			\
-	Stack = &yyptr->Stack_alloc;					\
-	yynewbytes = yystacksize * sizeof (*Stack) + YYSTACK_GAP_MAXIMUM; \
-	yyptr += yynewbytes / sizeof (*yyptr);				\
-      }									\
-    while (YYID (0))
-
-#endif
-
-#if defined YYCOPY_NEEDED && YYCOPY_NEEDED
-/* Copy COUNT objects from SRC to DST.  The source and destination do
-   not overlap.  */
-# ifndef YYCOPY
-#  if defined __GNUC__ && 1 < __GNUC__
-#   define YYCOPY(Dst, Src, Count) \
-      __builtin_memcpy (Dst, Src, (Count) * sizeof (*(Src)))
-#  else
-#   define YYCOPY(Dst, Src, Count)              \
-      do                                        \
-        {                                       \
-          YYSIZE_T yyi;                         \
-          for (yyi = 0; yyi < (Count); yyi++)   \
-            (Dst)[yyi] = (Src)[yyi];            \
-        }                                       \
-      while (YYID (0))
-#  endif
-# endif
-#endif /* !YYCOPY_NEEDED */
-
-/* YYFINAL -- State number of the termination state.  */
-#define YYFINAL  11
-/* YYLAST -- Last index in YYTABLE.  */
-#define YYLAST   298
-
-/* YYNTOKENS -- Number of terminals.  */
-#define YYNTOKENS  40
-/* YYNNTS -- Number of nonterminals.  */
-#define YYNNTS  50
-/* YYNRULES -- Number of rules.  */
-#define YYNRULES  122
-/* YYNRULES -- Number of states.  */
-#define YYNSTATES  199
-
-/* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
-#define YYUNDEFTOK  2
-#define YYMAXUTOK   294
-
-#define YYTRANSLATE(YYX)						\
-  ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)
-
-/* YYTRANSLATE[YYLEX] -- Bison symbol number corresponding to YYLEX.  */
-static const yytype_uint8 yytranslate[] =
-{
-       0,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
-       2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
-       5,     6,     7,     8,     9,    10,    11,    12,    13,    14,
-      15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
-      25,    26,    27,    28,    29,    30,    31,    32,    33,    34,
-      35,    36,    37,    38,    39
-};
-
-#if YYDEBUG
-/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
-   YYRHS.  */
-static const yytype_uint16 yyprhs[] =
-{
-       0,     0,     3,     6,     8,    11,    13,    14,    17,    20,
-      23,    26,    31,    36,    40,    42,    44,    46,    48,    50,
-      52,    54,    56,    58,    60,    62,    64,    66,    68,    72,
-      75,    79,    82,    86,    89,    90,    93,    96,    99,   102,
-     105,   108,   112,   117,   122,   127,   133,   137,   138,   142,
-     143,   146,   150,   153,   155,   159,   160,   163,   166,   169,
-     172,   175,   180,   184,   187,   192,   193,   196,   200,   202,
-     206,   207,   210,   213,   216,   220,   224,   228,   230,   234,
-     235,   238,   241,   244,   248,   252,   255,   258,   261,   262,
-     265,   268,   271,   276,   277,   280,   283,   286,   287,   290,
-     292,   294,   297,   300,   303,   305,   308,   309,   312,   314,
-     318,   322,   326,   330,   334,   338,   342,   345,   349,   353,
-     355,   357,   358
-};
-
-/* YYRHS -- A `-1'-separated list of the rules' RHS.  */
-static const yytype_int8 yyrhs[] =
-{
-      41,     0,    -1,    85,    42,    -1,    42,    -1,    67,    43,
-      -1,    43,    -1,    -1,    43,    45,    -1,    43,    59,    -1,
-      43,    71,    -1,    43,    84,    -1,    43,    26,     1,    35,
-      -1,    43,    44,     1,    35,    -1,    43,     1,    35,    -1,
-      16,    -1,    18,    -1,    19,    -1,    21,    -1,    17,    -1,
-      22,    -1,    20,    -1,    23,    -1,    35,    -1,    65,    -1,
-      75,    -1,    48,    -1,    50,    -1,    73,    -1,    26,     1,
-      35,    -1,     1,    35,    -1,    10,    26,    35,    -1,    47,
-      51,    -1,    11,    26,    35,    -1,    49,    51,    -1,    -1,
-      51,    52,    -1,    51,    53,    -1,    51,    79,    -1,    51,
-      77,    -1,    51,    46,    -1,    51,    35,    -1,    19,    82,
-      35,    -1,    18,    83,    86,    35,    -1,    20,    87,    86,
-      35,    -1,    21,    26,    86,    35,    -1,    22,    88,    88,
-      86,    35,    -1,    24,    54,    35,    -1,    -1,    54,    26,
-      55,    -1,    -1,    38,    83,    -1,     7,    89,    35,    -1,
-      56,    60,    -1,    84,    -1,    57,    62,    58,    -1,    -1,
-      60,    61,    -1,    60,    79,    -1,    60,    77,    -1,    60,
-      35,    -1,    60,    46,    -1,    18,    83,    86,    35,    -1,
-      19,    82,    35,    -1,    17,    35,    -1,    20,    26,    86,
-      35,    -1,    -1,    62,    45,    -1,    14,    87,    85,    -1,
-      84,    -1,    63,    66,    64,    -1,    -1,    66,    45,    -1,
-      66,    71,    -1,    66,    59,    -1,     3,    83,    85,    -1,
-       4,    83,    35,    -1,    68,    80,    78,    -1,    84,    -1,
-      69,    72,    70,    -1,    -1,    72,    45,    -1,    72,    71,
-      -1,    72,    59,    -1,     6,    83,    35,    -1,     9,    83,
-      35,    -1,    74,    78,    -1,    12,    35,    -1,    76,    13,
-      -1,    -1,    78,    79,    -1,    78,    35,    -1,    78,    46,
-      -1,    16,    25,    87,    35,    -1,    -1,    80,    81,    -1,
-      80,    35,    -1,    23,    86,    -1,    -1,    83,    86,    -1,
-      26,    -1,    27,    -1,     5,    35,    -1,     8,    35,    -1,
-      15,    35,    -1,    35,    -1,    85,    35,    -1,    -1,    14,
-      87,    -1,    88,    -1,    88,    29,    88,    -1,    88,    30,
-      88,    -1,    88,    31,    88,    -1,    88,    32,    88,    -1,
-      88,    38,    88,    -1,    88,    28,    88,    -1,    34,    87,
-      33,    -1,    39,    87,    -1,    87,    36,    87,    -1,    87,
-      37,    87,    -1,    26,    -1,    27,    -1,    -1,    26,    -1
-};
-
-/* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
-static const yytype_uint16 yyrline[] =
-{
-       0,   108,   108,   108,   110,   110,   112,   114,   115,   116,
-     117,   118,   119,   123,   127,   127,   127,   127,   127,   127,
-     127,   127,   131,   132,   133,   134,   135,   136,   140,   141,
-     147,   155,   161,   169,   179,   181,   182,   183,   184,   185,
-     186,   189,   197,   203,   213,   219,   225,   228,   230,   241,
-     242,   247,   256,   261,   269,   272,   274,   275,   276,   277,
-     278,   281,   287,   298,   304,   314,   316,   321,   329,   337,
-     340,   342,   343,   344,   349,   356,   363,   368,   376,   379,
-     381,   382,   383,   386,   394,   401,   408,   414,   421,   423,
-     424,   425,   428,   436,   438,   439,   442,   449,   451,   456,
-     457,   460,   461,   462,   466,   467,   470,   471,   474,   475,
-     476,   477,   478,   479,   480,   481,   482,   483,   484,   487,
-     488,   491,   492
-};
-#endif
-
-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
-/* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
-   First, the terminals, then, starting at YYNTOKENS, nonterminals.  */
-static const char *const yytname[] =
-{
-  "$end", "error", "$undefined", "T_MAINMENU", "T_MENU", "T_ENDMENU",
-  "T_SOURCE", "T_CHOICE", "T_ENDCHOICE", "T_COMMENT", "T_CONFIG",
-  "T_MENUCONFIG", "T_HELP", "T_HELPTEXT", "T_IF", "T_ENDIF", "T_DEPENDS",
-  "T_OPTIONAL", "T_PROMPT", "T_TYPE", "T_DEFAULT", "T_SELECT", "T_RANGE",
-  "T_VISIBLE", "T_OPTION", "T_ON", "T_WORD", "T_WORD_QUOTE", "T_UNEQUAL",
-  "T_LESS", "T_LESS_EQUAL", "T_GREATER", "T_GREATER_EQUAL",
-  "T_CLOSE_PAREN", "T_OPEN_PAREN", "T_EOL", "T_OR", "T_AND", "T_EQUAL",
-  "T_NOT", "$accept", "input", "start", "stmt_list", "option_name",
-  "common_stmt", "option_error", "config_entry_start", "config_stmt",
-  "menuconfig_entry_start", "menuconfig_stmt", "config_option_list",
-  "config_option", "symbol_option", "symbol_option_list",
-  "symbol_option_arg", "choice", "choice_entry", "choice_end",
-  "choice_stmt", "choice_option_list", "choice_option", "choice_block",
-  "if_entry", "if_end", "if_stmt", "if_block", "mainmenu_stmt", "menu",
-  "menu_entry", "menu_end", "menu_stmt", "menu_block", "source_stmt",
-  "comment", "comment_stmt", "help_start", "help", "depends_list",
-  "depends", "visibility_list", "visible", "prompt_stmt_opt", "prompt",
-  "end", "nl", "if_expr", "expr", "symbol", "word_opt", YY_NULL
-};
-#endif
-
-# ifdef YYPRINT
-/* YYTOKNUM[YYLEX-NUM] -- Internal token number corresponding to
-   token YYLEX-NUM.  */
-static const yytype_uint16 yytoknum[] =
-{
-       0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
-     265,   266,   267,   268,   269,   270,   271,   272,   273,   274,
-     275,   276,   277,   278,   279,   280,   281,   282,   283,   284,
-     285,   286,   287,   288,   289,   290,   291,   292,   293,   294
-};
-# endif
-
-/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
-static const yytype_uint8 yyr1[] =
-{
-       0,    40,    41,    41,    42,    42,    43,    43,    43,    43,
-      43,    43,    43,    43,    44,    44,    44,    44,    44,    44,
-      44,    44,    45,    45,    45,    45,    45,    45,    46,    46,
-      47,    48,    49,    50,    51,    51,    51,    51,    51,    51,
-      51,    52,    52,    52,    52,    52,    53,    54,    54,    55,
-      55,    56,    57,    58,    59,    60,    60,    60,    60,    60,
-      60,    61,    61,    61,    61,    62,    62,    63,    64,    65,
-      66,    66,    66,    66,    67,    68,    69,    70,    71,    72,
-      72,    72,    72,    73,    74,    75,    76,    77,    78,    78,
-      78,    78,    79,    80,    80,    80,    81,    82,    82,    83,
-      83,    84,    84,    84,    85,    85,    86,    86,    87,    87,
-      87,    87,    87,    87,    87,    87,    87,    87,    87,    88,
-      88,    89,    89
-};
-
-/* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
-static const yytype_uint8 yyr2[] =
-{
-       0,     2,     2,     1,     2,     1,     0,     2,     2,     2,
-       2,     4,     4,     3,     1,     1,     1,     1,     1,     1,
-       1,     1,     1,     1,     1,     1,     1,     1,     3,     2,
-       3,     2,     3,     2,     0,     2,     2,     2,     2,     2,
-       2,     3,     4,     4,     4,     5,     3,     0,     3,     0,
-       2,     3,     2,     1,     3,     0,     2,     2,     2,     2,
-       2,     4,     3,     2,     4,     0,     2,     3,     1,     3,
-       0,     2,     2,     2,     3,     3,     3,     1,     3,     0,
-       2,     2,     2,     3,     3,     2,     2,     2,     0,     2,
-       2,     2,     4,     0,     2,     2,     2,     0,     2,     1,
-       1,     2,     2,     2,     1,     2,     0,     2,     1,     3,
-       3,     3,     3,     3,     3,     3,     2,     3,     3,     1,
-       1,     0,     1
-};
-
-/* YYDEFACT[STATE-NAME] -- Default reduction number in state STATE-NUM.
-   Performed when YYTABLE doesn't specify something else to do.  Zero
-   means the default is an error.  */
-static const yytype_uint8 yydefact[] =
-{
-       6,     0,   104,     0,     3,     0,     6,     6,    99,   100,
-       0,     1,     0,     0,     0,     0,   121,     0,     0,     0,
-       0,     0,     0,    14,    18,    15,    16,    20,    17,    19,
-      21,     0,    22,     0,     7,    34,    25,    34,    26,    55,
-      65,     8,    70,    23,    93,    79,     9,    27,    88,    24,
-      10,     0,   105,     2,    74,    13,     0,   101,     0,   122,
-       0,   102,     0,     0,     0,   119,   120,     0,     0,     0,
-     108,   103,     0,     0,     0,     0,     0,     0,     0,    88,
-       0,     0,    75,    83,    51,    84,    30,    32,     0,   116,
-       0,     0,    67,     0,     0,     0,     0,     0,     0,    11,
-      12,     0,     0,     0,     0,    97,     0,     0,     0,    47,
-       0,    40,    39,    35,    36,     0,    38,    37,     0,     0,
-      97,     0,    59,    60,    56,    58,    57,    66,    54,    53,
-      71,    73,    69,    72,    68,   106,    95,     0,    94,    80,
-      82,    78,    81,    77,    90,    91,    89,   115,   117,   118,
-     114,   109,   110,   111,   112,   113,    29,    86,     0,   106,
-       0,   106,   106,   106,     0,     0,     0,    87,    63,   106,
-       0,   106,     0,    96,     0,     0,    41,    98,     0,     0,
-     106,    49,    46,    28,     0,    62,     0,   107,    92,    42,
-      43,    44,     0,     0,    48,    61,    64,    45,    50
-};
-
-/* YYDEFGOTO[NTERM-NUM].  */
-static const yytype_int16 yydefgoto[] =
-{
-      -1,     3,     4,     5,    33,    34,   112,    35,    36,    37,
-      38,    74,   113,   114,   165,   194,    39,    40,   128,    41,
-      76,   124,    77,    42,   132,    43,    78,     6,    44,    45,
-     141,    46,    80,    47,    48,    49,   115,   116,    81,   117,
-      79,   138,   160,   161,    50,     7,   173,    69,    70,    60
-};
-
-/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
-   STATE-NUM.  */
-#define YYPACT_NINF -91
-static const yytype_int16 yypact[] =
-{
-      19,    37,   -91,    13,   -91,    79,   -91,    20,   -91,   -91,
-     -16,   -91,    21,    37,    25,    37,    41,    36,    37,    78,
-      83,    31,    56,   -91,   -91,   -91,   -91,   -91,   -91,   -91,
-     -91,   116,   -91,   127,   -91,   -91,   -91,   -91,   -91,   -91,
-     -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,
-     -91,   147,   -91,   -91,   105,   -91,   109,   -91,   111,   -91,
-     114,   -91,   136,   137,   142,   -91,   -91,    31,    31,    76,
-     254,   -91,   143,   146,    27,   115,   207,   258,   243,   -14,
-     243,   179,   -91,   -91,   -91,   -91,   -91,   -91,    -7,   -91,
-      31,    31,   105,    51,    51,    51,    51,    51,    51,   -91,
-     -91,   156,   168,   181,    37,    37,    31,   178,    51,   -91,
-     206,   -91,   -91,   -91,   -91,   196,   -91,   -91,   175,    37,
-      37,   185,   -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,
-     -91,   -91,   -91,   -91,   -91,   214,   -91,   230,   -91,   -91,
-     -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,   183,   -91,
-     -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,    31,   214,
-     194,   214,    45,   214,    51,    26,   195,   -91,   -91,   214,
-     197,   214,    31,   -91,   139,   208,   -91,   -91,   220,   224,
-     214,   222,   -91,   -91,   226,   -91,   227,   123,   -91,   -91,
-     -91,   -91,   235,    37,   -91,   -91,   -91,   -91,   -91
-};
-
-/* YYPGOTO[NTERM-NUM].  */
-static const yytype_int16 yypgoto[] =
-{
-     -91,   -91,   264,   268,   -91,    30,   -65,   -91,   -91,   -91,
-     -91,   238,   -91,   -91,   -91,   -91,   -91,   -91,   -91,   -12,
-     -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,   -91,
-     -91,    -5,   -91,   -91,   -91,   -91,   -91,   200,   209,   -61,
-     -91,   -91,   170,    -1,    65,     0,   118,   -66,   -90,   -91
-};
-
-/* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
-   positive, shift that token.  If negative, reduce the rule which
-   number is the opposite.  If YYTABLE_NINF, syntax error.  */
-#define YYTABLE_NINF -86
-static const yytype_int16 yytable[] =
-{
-      10,    88,    89,   150,   151,   152,   153,   154,   155,   135,
-      54,   123,    56,    11,    58,   126,   145,    62,   164,     2,
-     146,   136,     1,     1,   148,   149,   147,   -31,   101,    90,
-      91,   -31,   -31,   -31,   -31,   -31,   -31,   -31,   -31,   102,
-     162,   -31,   -31,   103,   -31,   104,   105,   106,   107,   108,
-     -31,   109,   181,   110,     2,    52,    55,    65,    66,   172,
-      57,   182,   111,     8,     9,    67,   131,    59,   140,    92,
-      68,    61,   145,   133,   180,   142,   146,    65,    66,    -5,
-      12,    90,    91,    13,    14,    15,    16,    17,    18,    19,
-      20,    71,   174,    21,    22,    23,    24,    25,    26,    27,
-      28,    29,    30,   159,    63,    31,   187,   127,   130,    64,
-     139,     2,    90,    91,    32,   -33,   101,    72,   169,   -33,
-     -33,   -33,   -33,   -33,   -33,   -33,   -33,   102,    73,   -33,
-     -33,   103,   -33,   104,   105,   106,   107,   108,   -33,   109,
-      52,   110,   129,   134,    82,   143,    83,    -4,    12,    84,
-     111,    13,    14,    15,    16,    17,    18,    19,    20,    90,
-      91,    21,    22,    23,    24,    25,    26,    27,    28,    29,
-      30,    85,    86,    31,   188,    90,    91,    87,    99,   -85,
-     101,   100,    32,   -85,   -85,   -85,   -85,   -85,   -85,   -85,
-     -85,   156,   198,   -85,   -85,   103,   -85,   -85,   -85,   -85,
-     -85,   -85,   -85,   157,   163,   110,   158,   166,   101,   167,
-     168,   171,   -52,   -52,   144,   -52,   -52,   -52,   -52,   102,
-      91,   -52,   -52,   103,   118,   119,   120,   121,   172,   176,
-     183,   101,   185,   110,   -76,   -76,   -76,   -76,   -76,   -76,
-     -76,   -76,   122,   189,   -76,   -76,   103,    13,    14,    15,
-      16,    17,    18,    19,    20,   190,   110,    21,    22,   191,
-     193,   195,   196,    14,    15,   144,    17,    18,    19,    20,
-     197,    53,    21,    22,    51,    75,   125,   175,    32,   177,
-     178,   179,    93,    94,    95,    96,    97,   184,   137,   186,
-     170,     0,    98,    32,     0,     0,     0,     0,   192
-};
-
-#define yypact_value_is_default(yystate) \
-  ((yystate) == (-91))
-
-#define yytable_value_is_error(yytable_value) \
-  YYID (0)
-
-static const yytype_int16 yycheck[] =
-{
-       1,    67,    68,    93,    94,    95,    96,    97,    98,    23,
-      10,    76,    13,     0,    15,    76,    81,    18,   108,    35,
-      81,    35,     3,     3,    90,    91,    33,     0,     1,    36,
-      37,     4,     5,     6,     7,     8,     9,    10,    11,    12,
-     106,    14,    15,    16,    17,    18,    19,    20,    21,    22,
-      23,    24,    26,    26,    35,    35,    35,    26,    27,    14,
-      35,    35,    35,    26,    27,    34,    78,    26,    80,    69,
-      39,    35,   137,    78,   164,    80,   137,    26,    27,     0,
-       1,    36,    37,     4,     5,     6,     7,     8,     9,    10,
-      11,    35,   158,    14,    15,    16,    17,    18,    19,    20,
-      21,    22,    23,   104,    26,    26,   172,    77,    78,    26,
-      80,    35,    36,    37,    35,     0,     1,     1,   119,     4,
-       5,     6,     7,     8,     9,    10,    11,    12,     1,    14,
-      15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
-      35,    26,    77,    78,    35,    80,    35,     0,     1,    35,
-      35,     4,     5,     6,     7,     8,     9,    10,    11,    36,
-      37,    14,    15,    16,    17,    18,    19,    20,    21,    22,
-      23,    35,    35,    26,    35,    36,    37,    35,    35,     0,
-       1,    35,    35,     4,     5,     6,     7,     8,     9,    10,
-      11,    35,   193,    14,    15,    16,    17,    18,    19,    20,
-      21,    22,    23,    35,    26,    26,    25,     1,     1,    13,
-      35,    26,     5,     6,    35,     8,     9,    10,    11,    12,
-      37,    14,    15,    16,    17,    18,    19,    20,    14,    35,
-      35,     1,    35,    26,     4,     5,     6,     7,     8,     9,
-      10,    11,    35,    35,    14,    15,    16,     4,     5,     6,
-       7,     8,     9,    10,    11,    35,    26,    14,    15,    35,
-      38,    35,    35,     5,     6,    35,     8,     9,    10,    11,
-      35,     7,    14,    15,     6,    37,    76,   159,    35,   161,
-     162,   163,    28,    29,    30,    31,    32,   169,    79,   171,
-     120,    -1,    38,    35,    -1,    -1,    -1,    -1,   180
-};
-
-/* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
-   symbol of state STATE-NUM.  */
-static const yytype_uint8 yystos[] =
-{
-       0,     3,    35,    41,    42,    43,    67,    85,    26,    27,
-      83,     0,     1,     4,     5,     6,     7,     8,     9,    10,
-      11,    14,    15,    16,    17,    18,    19,    20,    21,    22,
-      23,    26,    35,    44,    45,    47,    48,    49,    50,    56,
-      57,    59,    63,    65,    68,    69,    71,    73,    74,    75,
-      84,    43,    35,    42,    85,    35,    83,    35,    83,    26,
-      89,    35,    83,    26,    26,    26,    27,    34,    39,    87,
-      88,    35,     1,     1,    51,    51,    60,    62,    66,    80,
-      72,    78,    35,    35,    35,    35,    35,    35,    87,    87,
-      36,    37,    85,    28,    29,    30,    31,    32,    38,    35,
-      35,     1,    12,    16,    18,    19,    20,    21,    22,    24,
-      26,    35,    46,    52,    53,    76,    77,    79,    17,    18,
-      19,    20,    35,    46,    61,    77,    79,    45,    58,    84,
-      45,    59,    64,    71,    84,    23,    35,    78,    81,    45,
-      59,    70,    71,    84,    35,    46,    79,    33,    87,    87,
-      88,    88,    88,    88,    88,    88,    35,    35,    25,    83,
-      82,    83,    87,    26,    88,    54,     1,    13,    35,    83,
-      82,    26,    14,    86,    87,    86,    35,    86,    86,    86,
-      88,    26,    35,    35,    86,    35,    86,    87,    35,    35,
-      35,    35,    86,    38,    55,    35,    35,    35,    83
-};
-
-#define yyerrok		(yyerrstatus = 0)
-#define yyclearin	(yychar = YYEMPTY)
-#define YYEMPTY		(-2)
-#define YYEOF		0
-
-#define YYACCEPT	goto yyacceptlab
-#define YYABORT		goto yyabortlab
-#define YYERROR		goto yyerrorlab
-
-
-/* Like YYERROR except do call yyerror.  This remains here temporarily
-   to ease the transition to the new meaning of YYERROR, for GCC.
-   Once GCC version 2 has supplanted version 1, this can go.  However,
-   YYFAIL appears to be in use.  Nevertheless, it is formally deprecated
-   in Bison 2.4.2's NEWS entry, where a plan to phase it out is
-   discussed.  */
-
-#define YYFAIL		goto yyerrlab
-#if defined YYFAIL
-  /* This is here to suppress warnings from the GCC cpp's
-     -Wunused-macros.  Normally we don't worry about that warning, but
-     some users do, and we want to make it easy for users to remove
-     YYFAIL uses, which will produce warnings from Bison 2.5.  */
-#endif
-
-#define YYRECOVERING()  (!!yyerrstatus)
-
-#define YYBACKUP(Token, Value)                                  \
-do                                                              \
-  if (yychar == YYEMPTY)                                        \
-    {                                                           \
-      yychar = (Token);                                         \
-      yylval = (Value);                                         \
-      YYPOPSTACK (yylen);                                       \
-      yystate = *yyssp;                                         \
-      goto yybackup;                                            \
-    }                                                           \
-  else                                                          \
-    {                                                           \
-      yyerror (YY_("syntax error: cannot back up")); \
-      YYERROR;							\
-    }								\
-while (YYID (0))
-
-
-#define YYTERROR	1
-#define YYERRCODE	256
-
-
-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
-#define YYRHSLOC(Rhs, K) ((Rhs)[K])
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N)				\
-    do									\
-      if (YYID (N))                                                    \
-	{								\
-	  (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;	\
-	  (Current).first_column = YYRHSLOC (Rhs, 1).first_column;	\
-	  (Current).last_line    = YYRHSLOC (Rhs, N).last_line;		\
-	  (Current).last_column  = YYRHSLOC (Rhs, N).last_column;	\
-	}								\
-      else								\
-	{								\
-	  (Current).first_line   = (Current).last_line   =		\
-	    YYRHSLOC (Rhs, 0).last_line;				\
-	  (Current).first_column = (Current).last_column =		\
-	    YYRHSLOC (Rhs, 0).last_column;				\
-	}								\
-    while (YYID (0))
-#endif
-
-
-/* This macro is provided for backward compatibility. */
-
-#ifndef YY_LOCATION_PRINT
-# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-#endif
-
-
-/* YYLEX -- calling `yylex' with the right arguments.  */
-
-#ifdef YYLEX_PARAM
-# define YYLEX yylex (YYLEX_PARAM)
-#else
-# define YYLEX yylex ()
-#endif
-
-/* Enable debugging if requested.  */
-#if YYDEBUG
-
-# ifndef YYFPRINTF
-#  include <stdio.h> /* INFRINGES ON USER NAME SPACE */
-#  define YYFPRINTF fprintf
-# endif
-
-# define YYDPRINTF(Args)			\
-do {						\
-  if (yydebug)					\
-    YYFPRINTF Args;				\
-} while (YYID (0))
-
-# define YY_SYMBOL_PRINT(Title, Type, Value, Location)			  \
-do {									  \
-  if (yydebug)								  \
-    {									  \
-      YYFPRINTF (stderr, "%s ", Title);					  \
-      yy_symbol_print (stderr,						  \
-		  Type, Value); \
-      YYFPRINTF (stderr, "\n");						  \
-    }									  \
-} while (YYID (0))
-
-
-/*--------------------------------.
-| Print this symbol on YYOUTPUT.  |
-`--------------------------------*/
-
-/*ARGSUSED*/
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static void
-yy_symbol_value_print (FILE *yyoutput, int yytype, YYSTYPE const * const yyvaluep)
-#else
-static void
-yy_symbol_value_print (yyoutput, yytype, yyvaluep)
-    FILE *yyoutput;
-    int yytype;
-    YYSTYPE const * const yyvaluep;
-#endif
-{
-  FILE *yyo = yyoutput;
-  YYUSE (yyo);
-  if (!yyvaluep)
-    return;
-# ifdef YYPRINT
-  if (yytype < YYNTOKENS)
-    YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
-# else
-  YYUSE (yyoutput);
-# endif
-  switch (yytype)
-    {
-      default:
-	break;
-    }
-}
-
-
-/*--------------------------------.
-| Print this symbol on YYOUTPUT.  |
-`--------------------------------*/
-
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static void
-yy_symbol_print (FILE *yyoutput, int yytype, YYSTYPE const * const yyvaluep)
-#else
-static void
-yy_symbol_print (yyoutput, yytype, yyvaluep)
-    FILE *yyoutput;
-    int yytype;
-    YYSTYPE const * const yyvaluep;
-#endif
-{
-  if (yytype < YYNTOKENS)
-    YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
-  else
-    YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
-
-  yy_symbol_value_print (yyoutput, yytype, yyvaluep);
-  YYFPRINTF (yyoutput, ")");
-}
-
-/*------------------------------------------------------------------.
-| yy_stack_print -- Print the state stack from its BOTTOM up to its |
-| TOP (included).                                                   |
-`------------------------------------------------------------------*/
-
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static void
-yy_stack_print (yytype_int16 *yybottom, yytype_int16 *yytop)
-#else
-static void
-yy_stack_print (yybottom, yytop)
-    yytype_int16 *yybottom;
-    yytype_int16 *yytop;
-#endif
-{
-  YYFPRINTF (stderr, "Stack now");
-  for (; yybottom <= yytop; yybottom++)
-    {
-      int yybot = *yybottom;
-      YYFPRINTF (stderr, " %d", yybot);
-    }
-  YYFPRINTF (stderr, "\n");
-}
-
-# define YY_STACK_PRINT(Bottom, Top)				\
-do {								\
-  if (yydebug)							\
-    yy_stack_print ((Bottom), (Top));				\
-} while (YYID (0))
-
-
-/*------------------------------------------------.
-| Report that the YYRULE is going to be reduced.  |
-`------------------------------------------------*/
-
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static void
-yy_reduce_print (YYSTYPE *yyvsp, int yyrule)
-#else
-static void
-yy_reduce_print (yyvsp, yyrule)
-    YYSTYPE *yyvsp;
-    int yyrule;
-#endif
-{
-  int yynrhs = yyr2[yyrule];
-  int yyi;
-  unsigned long int yylno = yyrline[yyrule];
-  YYFPRINTF (stderr, "Reducing stack by rule %d (line %lu):\n",
-	     yyrule - 1, yylno);
-  /* The symbols being reduced.  */
-  for (yyi = 0; yyi < yynrhs; yyi++)
-    {
-      YYFPRINTF (stderr, "   $%d = ", yyi + 1);
-      yy_symbol_print (stderr, yyrhs[yyprhs[yyrule] + yyi],
-		       &(yyvsp[(yyi + 1) - (yynrhs)])
-		       		       );
-      YYFPRINTF (stderr, "\n");
-    }
-}
-
-# define YY_REDUCE_PRINT(Rule)		\
-do {					\
-  if (yydebug)				\
-    yy_reduce_print (yyvsp, Rule); \
-} while (YYID (0))
-
-/* Nonzero means print parse trace.  It is left uninitialized so that
-   multiple parsers can coexist.  */
-int yydebug;
-#else /* !YYDEBUG */
-# define YYDPRINTF(Args)
-# define YY_SYMBOL_PRINT(Title, Type, Value, Location)
-# define YY_STACK_PRINT(Bottom, Top)
-# define YY_REDUCE_PRINT(Rule)
-#endif /* !YYDEBUG */
-
-
-/* YYINITDEPTH -- initial size of the parser's stacks.  */
-#ifndef	YYINITDEPTH
-# define YYINITDEPTH 200
-#endif
-
-/* YYMAXDEPTH -- maximum size the stacks can grow to (effective only
-   if the built-in stack extension method is used).
-
-   Do not make this value too large; the results are undefined if
-   YYSTACK_ALLOC_MAXIMUM < YYSTACK_BYTES (YYMAXDEPTH)
-   evaluated with infinite-precision integer arithmetic.  */
-
-#ifndef YYMAXDEPTH
-# define YYMAXDEPTH 10000
-#endif
-
-
-#if YYERROR_VERBOSE
-
-# ifndef yystrlen
-#  if defined __GLIBC__ && defined _STRING_H
-#   define yystrlen strlen
-#  else
-/* Return the length of YYSTR.  */
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static YYSIZE_T
-yystrlen (const char *yystr)
-#else
-static YYSIZE_T
-yystrlen (yystr)
-    const char *yystr;
-#endif
-{
-  YYSIZE_T yylen;
-  for (yylen = 0; yystr[yylen]; yylen++)
-    continue;
-  return yylen;
-}
-#  endif
-# endif
-
-# ifndef yystpcpy
-#  if defined __GLIBC__ && defined _STRING_H && defined _GNU_SOURCE
-#   define yystpcpy stpcpy
-#  else
-/* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in
-   YYDEST.  */
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static char *
-yystpcpy (char *yydest, const char *yysrc)
-#else
-static char *
-yystpcpy (yydest, yysrc)
-    char *yydest;
-    const char *yysrc;
-#endif
-{
-  char *yyd = yydest;
-  const char *yys = yysrc;
-
-  while ((*yyd++ = *yys++) != '\0')
-    continue;
-
-  return yyd - 1;
-}
-#  endif
-# endif
-
-# ifndef yytnamerr
-/* Copy to YYRES the contents of YYSTR after stripping away unnecessary
-   quotes and backslashes, so that it's suitable for yyerror.  The
-   heuristic is that double-quoting is unnecessary unless the string
-   contains an apostrophe, a comma, or backslash (other than
-   backslash-backslash).  YYSTR is taken from yytname.  If YYRES is
-   null, do not copy; instead, return the length of what the result
-   would have been.  */
-static YYSIZE_T
-yytnamerr (char *yyres, const char *yystr)
-{
-  if (*yystr == '"')
-    {
-      YYSIZE_T yyn = 0;
-      char const *yyp = yystr;
-
-      for (;;)
-	switch (*++yyp)
-	  {
-	  case '\'':
-	  case ',':
-	    goto do_not_strip_quotes;
-
-	  case '\\':
-	    if (*++yyp != '\\')
-	      goto do_not_strip_quotes;
-	    /* Fall through.  */
-	  default:
-	    if (yyres)
-	      yyres[yyn] = *yyp;
-	    yyn++;
-	    break;
-
-	  case '"':
-	    if (yyres)
-	      yyres[yyn] = '\0';
-	    return yyn;
-	  }
-    do_not_strip_quotes: ;
-    }
-
-  if (! yyres)
-    return yystrlen (yystr);
-
-  return yystpcpy (yyres, yystr) - yyres;
-}
-# endif
-
-/* Copy into *YYMSG, which is of size *YYMSG_ALLOC, an error message
-   about the unexpected token YYTOKEN for the state stack whose top is
-   YYSSP.
-
-   Return 0 if *YYMSG was successfully written.  Return 1 if *YYMSG is
-   not large enough to hold the message.  In that case, also set
-   *YYMSG_ALLOC to the required number of bytes.  Return 2 if the
-   required number of bytes is too large to store.  */
-static int
-yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
-                yytype_int16 *yyssp, int yytoken)
-{
-  YYSIZE_T yysize0 = yytnamerr (YY_NULL, yytname[yytoken]);
-  YYSIZE_T yysize = yysize0;
-  YYSIZE_T yysize1;
-  enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
-  /* Internationalized format string. */
-  const char *yyformat = YY_NULL;
-  /* Arguments of yyformat. */
-  char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
-  /* Number of reported tokens (one for the "unexpected", one per
-     "expected"). */
-  int yycount = 0;
-
-  /* There are many possibilities here to consider:
-     - Assume YYFAIL is not used.  It's too flawed to consider.  See
-       <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
-       for details.  YYERROR is fine as it does not invoke this
-       function.
-     - If this state is a consistent state with a default action, then
-       the only way this function was invoked is if the default action
-       is an error action.  In that case, don't check for expected
-       tokens because there are none.
-     - The only way there can be no lookahead present (in yychar) is if
-       this state is a consistent state with a default action.  Thus,
-       detecting the absence of a lookahead is sufficient to determine
-       that there is no unexpected or expected token to report.  In that
-       case, just report a simple "syntax error".
-     - Don't assume there isn't a lookahead just because this state is a
-       consistent state with a default action.  There might have been a
-       previous inconsistent state, consistent state with a non-default
-       action, or user semantic action that manipulated yychar.
-     - Of course, the expected token list depends on states to have
-       correct lookahead information, and it depends on the parser not
-       to perform extra reductions after fetching a lookahead from the
-       scanner and before detecting a syntax error.  Thus, state merging
-       (from LALR or IELR) and default reductions corrupt the expected
-       token list.  However, the list is correct for canonical LR with
-       one exception: it will still contain any token that will not be
-       accepted due to an error action in a later state.
-  */
-  if (yytoken != YYEMPTY)
-    {
-      int yyn = yypact[*yyssp];
-      yyarg[yycount++] = yytname[yytoken];
-      if (!yypact_value_is_default (yyn))
-        {
-          /* Start YYX at -YYN if negative to avoid negative indexes in
-             YYCHECK.  In other words, skip the first -YYN actions for
-             this state because they are default actions.  */
-          int yyxbegin = yyn < 0 ? -yyn : 0;
-          /* Stay within bounds of both yycheck and yytname.  */
-          int yychecklim = YYLAST - yyn + 1;
-          int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
-          int yyx;
-
-          for (yyx = yyxbegin; yyx < yyxend; ++yyx)
-            if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR
-                && !yytable_value_is_error (yytable[yyx + yyn]))
-              {
-                if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
-                  {
-                    yycount = 1;
-                    yysize = yysize0;
-                    break;
-                  }
-                yyarg[yycount++] = yytname[yyx];
-                yysize1 = yysize + yytnamerr (YY_NULL, yytname[yyx]);
-                if (! (yysize <= yysize1
-                       && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
-                  return 2;
-                yysize = yysize1;
-              }
-        }
-    }
-
-  switch (yycount)
-    {
-# define YYCASE_(N, S)                      \
-      case N:                               \
-        yyformat = S;                       \
-      break
-      YYCASE_(0, YY_("syntax error"));
-      YYCASE_(1, YY_("syntax error, unexpected %s"));
-      YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
-      YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
-      YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
-      YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
-# undef YYCASE_
-    }
-
-  yysize1 = yysize + yystrlen (yyformat);
-  if (! (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
-    return 2;
-  yysize = yysize1;
-
-  if (*yymsg_alloc < yysize)
-    {
-      *yymsg_alloc = 2 * yysize;
-      if (! (yysize <= *yymsg_alloc
-             && *yymsg_alloc <= YYSTACK_ALLOC_MAXIMUM))
-        *yymsg_alloc = YYSTACK_ALLOC_MAXIMUM;
-      return 1;
-    }
-
-  /* Avoid sprintf, as that infringes on the user's name space.
-     Don't have undefined behavior even if the translation
-     produced a string with the wrong number of "%s"s.  */
-  {
-    char *yyp = *yymsg;
-    int yyi = 0;
-    while ((*yyp = *yyformat) != '\0')
-      if (*yyp == '%' && yyformat[1] == 's' && yyi < yycount)
-        {
-          yyp += yytnamerr (yyp, yyarg[yyi++]);
-          yyformat += 2;
-        }
-      else
-        {
-          yyp++;
-          yyformat++;
-        }
-  }
-  return 0;
-}
-#endif /* YYERROR_VERBOSE */
-
-/*-----------------------------------------------.
-| Release the memory associated to this symbol.  |
-`-----------------------------------------------*/
-
-/*ARGSUSED*/
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-static void
-yydestruct (const char *yymsg, int yytype, YYSTYPE *yyvaluep)
-#else
-static void
-yydestruct (yymsg, yytype, yyvaluep)
-    const char *yymsg;
-    int yytype;
-    YYSTYPE *yyvaluep;
-#endif
-{
-  YYUSE (yyvaluep);
-
-  if (!yymsg)
-    yymsg = "Deleting";
-  YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
-
-  switch (yytype)
-    {
-      case 57: /* "choice_entry" */
-
-	{
-	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
-		(yyvaluep->menu)->file->name, (yyvaluep->menu)->lineno);
-	if (current_menu == (yyvaluep->menu))
-		menu_end_menu();
-};
-
-	break;
-      case 63: /* "if_entry" */
-
-	{
-	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
-		(yyvaluep->menu)->file->name, (yyvaluep->menu)->lineno);
-	if (current_menu == (yyvaluep->menu))
-		menu_end_menu();
-};
-
-	break;
-      case 69: /* "menu_entry" */
-
-	{
-	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
-		(yyvaluep->menu)->file->name, (yyvaluep->menu)->lineno);
-	if (current_menu == (yyvaluep->menu))
-		menu_end_menu();
-};
-
-	break;
-
-      default:
-	break;
-    }
-}
-
-
-/* Prevent warnings from -Wmissing-prototypes.  */
-#ifdef YYPARSE_PARAM
-#if defined __STDC__ || defined __cplusplus
-int yyparse (void *YYPARSE_PARAM);
-#else
-int yyparse ();
-#endif
-#else /* ! YYPARSE_PARAM */
-#if defined __STDC__ || defined __cplusplus
-int yyparse (void);
-#else
-int yyparse ();
-#endif
-#endif /* ! YYPARSE_PARAM */
-
-
-/* The lookahead symbol.  */
-int yychar;
-
-/* The semantic value of the lookahead symbol.  */
-YYSTYPE yylval;
-
-/* Number of syntax errors so far.  */
-int yynerrs;
-
-
-/*----------.
-| yyparse.  |
-`----------*/
-
-#ifdef YYPARSE_PARAM
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-int
-yyparse (void *YYPARSE_PARAM)
-#else
-int
-yyparse (YYPARSE_PARAM)
-    void *YYPARSE_PARAM;
-#endif
-#else /* ! YYPARSE_PARAM */
-#if (defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)
-int
-yyparse (void)
-#else
-int
-yyparse ()
-
-#endif
-#endif
-{
-    int yystate;
-    /* Number of tokens to shift before error messages enabled.  */
-    int yyerrstatus;
-
-    /* The stacks and their tools:
-       `yyss': related to states.
-       `yyvs': related to semantic values.
-
-       Refer to the stacks through separate pointers, to allow yyoverflow
-       to reallocate them elsewhere.  */
-
-    /* The state stack.  */
-    yytype_int16 yyssa[YYINITDEPTH];
-    yytype_int16 *yyss;
-    yytype_int16 *yyssp;
-
-    /* The semantic value stack.  */
-    YYSTYPE yyvsa[YYINITDEPTH];
-    YYSTYPE *yyvs;
-    YYSTYPE *yyvsp;
-
-    YYSIZE_T yystacksize;
-
-  int yyn;
-  int yyresult;
-  /* Lookahead token as an internal (translated) token number.  */
-  int yytoken;
-  /* The variables used to return semantic value and location from the
-     action routines.  */
-  YYSTYPE yyval;
-
-#if YYERROR_VERBOSE
-  /* Buffer for error messages, and its allocated size.  */
-  char yymsgbuf[128];
-  char *yymsg = yymsgbuf;
-  YYSIZE_T yymsg_alloc = sizeof yymsgbuf;
-#endif
-
-#define YYPOPSTACK(N)   (yyvsp -= (N), yyssp -= (N))
-
-  /* The number of symbols on the RHS of the reduced rule.
-     Keep to zero when no symbol should be popped.  */
-  int yylen = 0;
-
-  yytoken = 0;
-  yyss = yyssa;
-  yyvs = yyvsa;
-  yystacksize = YYINITDEPTH;
-
-  YYDPRINTF ((stderr, "Starting parse\n"));
-
-  yystate = 0;
-  yyerrstatus = 0;
-  yynerrs = 0;
-  yychar = YYEMPTY; /* Cause a token to be read.  */
-
-  /* Initialize stack pointers.
-     Waste one element of value and location stack
-     so that they stay on the same level as the state stack.
-     The wasted elements are never initialized.  */
-  yyssp = yyss;
-  yyvsp = yyvs;
-
-  goto yysetstate;
-
-/*------------------------------------------------------------.
-| yynewstate -- Push a new state, which is found in yystate.  |
-`------------------------------------------------------------*/
- yynewstate:
-  /* In all cases, when you get here, the value and location stacks
-     have just been pushed.  So pushing a state here evens the stacks.  */
-  yyssp++;
-
- yysetstate:
-  *yyssp = yystate;
-
-  if (yyss + yystacksize - 1 <= yyssp)
-    {
-      /* Get the current used size of the three stacks, in elements.  */
-      YYSIZE_T yysize = yyssp - yyss + 1;
-
-#ifdef yyoverflow
-      {
-	/* Give user a chance to reallocate the stack.  Use copies of
-	   these so that the &'s don't force the real ones into
-	   memory.  */
-	YYSTYPE *yyvs1 = yyvs;
-	yytype_int16 *yyss1 = yyss;
-
-	/* Each stack pointer address is followed by the size of the
-	   data in use in that stack, in bytes.  This used to be a
-	   conditional around just the two extra args, but that might
-	   be undefined if yyoverflow is a macro.  */
-	yyoverflow (YY_("memory exhausted"),
-		    &yyss1, yysize * sizeof (*yyssp),
-		    &yyvs1, yysize * sizeof (*yyvsp),
-		    &yystacksize);
-
-	yyss = yyss1;
-	yyvs = yyvs1;
-      }
-#else /* no yyoverflow */
-# ifndef YYSTACK_RELOCATE
-      goto yyexhaustedlab;
-# else
-      /* Extend the stack our own way.  */
-      if (YYMAXDEPTH <= yystacksize)
-	goto yyexhaustedlab;
-      yystacksize *= 2;
-      if (YYMAXDEPTH < yystacksize)
-	yystacksize = YYMAXDEPTH;
-
-      {
-	yytype_int16 *yyss1 = yyss;
-	union yyalloc *yyptr =
-	  (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
-	if (! yyptr)
-	  goto yyexhaustedlab;
-	YYSTACK_RELOCATE (yyss_alloc, yyss);
-	YYSTACK_RELOCATE (yyvs_alloc, yyvs);
-#  undef YYSTACK_RELOCATE
-	if (yyss1 != yyssa)
-	  YYSTACK_FREE (yyss1);
-      }
-# endif
-#endif /* no yyoverflow */
-
-      yyssp = yyss + yysize - 1;
-      yyvsp = yyvs + yysize - 1;
-
-      YYDPRINTF ((stderr, "Stack size increased to %lu\n",
-		  (unsigned long int) yystacksize));
-
-      if (yyss + yystacksize - 1 <= yyssp)
-	YYABORT;
-    }
-
-  YYDPRINTF ((stderr, "Entering state %d\n", yystate));
-
-  if (yystate == YYFINAL)
-    YYACCEPT;
-
-  goto yybackup;
-
-/*-----------.
-| yybackup.  |
-`-----------*/
-yybackup:
-
-  /* Do appropriate processing given the current state.  Read a
-     lookahead token if we need one and don't already have one.  */
-
-  /* First try to decide what to do without reference to lookahead token.  */
-  yyn = yypact[yystate];
-  if (yypact_value_is_default (yyn))
-    goto yydefault;
-
-  /* Not known => get a lookahead token if don't already have one.  */
-
-  /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol.  */
-  if (yychar == YYEMPTY)
-    {
-      YYDPRINTF ((stderr, "Reading a token: "));
-      yychar = YYLEX;
-    }
-
-  if (yychar <= YYEOF)
-    {
-      yychar = yytoken = YYEOF;
-      YYDPRINTF ((stderr, "Now at end of input.\n"));
-    }
-  else
-    {
-      yytoken = YYTRANSLATE (yychar);
-      YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc);
-    }
-
-  /* If the proper action on seeing token YYTOKEN is to reduce or to
-     detect an error, take that action.  */
-  yyn += yytoken;
-  if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
-    goto yydefault;
-  yyn = yytable[yyn];
-  if (yyn <= 0)
-    {
-      if (yytable_value_is_error (yyn))
-        goto yyerrlab;
-      yyn = -yyn;
-      goto yyreduce;
-    }
-
-  /* Count tokens shifted since error; after three, turn off error
-     status.  */
-  if (yyerrstatus)
-    yyerrstatus--;
-
-  /* Shift the lookahead token.  */
-  YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);
-
-  /* Discard the shifted token.  */
-  yychar = YYEMPTY;
-
-  yystate = yyn;
-  *++yyvsp = yylval;
-
-  goto yynewstate;
-
-
-/*-----------------------------------------------------------.
-| yydefault -- do the default action for the current state.  |
-`-----------------------------------------------------------*/
-yydefault:
-  yyn = yydefact[yystate];
-  if (yyn == 0)
-    goto yyerrlab;
-  goto yyreduce;
-
-
-/*-----------------------------.
-| yyreduce -- Do a reduction.  |
-`-----------------------------*/
-yyreduce:
-  /* yyn is the number of a rule to reduce with.  */
-  yylen = yyr2[yyn];
-
-  /* If YYLEN is nonzero, implement the default value of the action:
-     `$$ = $1'.
-
-     Otherwise, the following line sets YYVAL to garbage.
-     This behavior is undocumented and Bison
-     users should not rely upon it.  Assigning to YYVAL
-     unconditionally makes the parser a bit smaller, and it avoids a
-     GCC warning that YYVAL may be used uninitialized.  */
-  yyval = yyvsp[1-yylen];
-
-
-  YY_REDUCE_PRINT (yyn);
-  switch (yyn)
-    {
-        case 10:
-
-    { zconf_error("unexpected end statement"); }
-    break;
-
-  case 11:
-
-    { zconf_error("unknown statement \"%s\"", (yyvsp[(2) - (4)].string)); }
-    break;
-
-  case 12:
-
-    {
-	zconf_error("unexpected option \"%s\"", kconf_id_strings + (yyvsp[(2) - (4)].id)->name);
-}
-    break;
-
-  case 13:
-
-    { zconf_error("invalid statement"); }
-    break;
-
-  case 28:
-
-    { zconf_error("unknown option \"%s\"", (yyvsp[(1) - (3)].string)); }
-    break;
-
-  case 29:
-
-    { zconf_error("invalid option"); }
-    break;
-
-  case 30:
-
-    {
-	struct symbol *sym = sym_lookup((yyvsp[(2) - (3)].string), 0);
-	sym->flags |= SYMBOL_OPTIONAL;
-	menu_add_entry(sym);
-	printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), (yyvsp[(2) - (3)].string));
-}
-    break;
-
-  case 31:
-
-    {
-	menu_end_entry();
-	printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 32:
-
-    {
-	struct symbol *sym = sym_lookup((yyvsp[(2) - (3)].string), 0);
-	sym->flags |= SYMBOL_OPTIONAL;
-	menu_add_entry(sym);
-	printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", zconf_curname(), zconf_lineno(), (yyvsp[(2) - (3)].string));
-}
-    break;
-
-  case 33:
-
-    {
-	if (current_entry->prompt)
-		current_entry->prompt->type = P_MENU;
-	else
-		zconfprint("warning: menuconfig statement without prompt");
-	menu_end_entry();
-	printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 41:
-
-    {
-	menu_set_type((yyvsp[(1) - (3)].id)->stype);
-	printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
-		zconf_curname(), zconf_lineno(),
-		(yyvsp[(1) - (3)].id)->stype);
-}
-    break;
-
-  case 42:
-
-    {
-	menu_add_prompt(P_PROMPT, (yyvsp[(2) - (4)].string), (yyvsp[(3) - (4)].expr));
-	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 43:
-
-    {
-	menu_add_expr(P_DEFAULT, (yyvsp[(2) - (4)].expr), (yyvsp[(3) - (4)].expr));
-	if ((yyvsp[(1) - (4)].id)->stype != S_UNKNOWN)
-		menu_set_type((yyvsp[(1) - (4)].id)->stype);
-	printd(DEBUG_PARSE, "%s:%d:default(%u)\n",
-		zconf_curname(), zconf_lineno(),
-		(yyvsp[(1) - (4)].id)->stype);
-}
-    break;
-
-  case 44:
-
-    {
-	menu_add_symbol(P_SELECT, sym_lookup((yyvsp[(2) - (4)].string), 0), (yyvsp[(3) - (4)].expr));
-	printd(DEBUG_PARSE, "%s:%d:select\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 45:
-
-    {
-	menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,(yyvsp[(2) - (5)].symbol), (yyvsp[(3) - (5)].symbol)), (yyvsp[(4) - (5)].expr));
-	printd(DEBUG_PARSE, "%s:%d:range\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 48:
-
-    {
-	const struct kconf_id *id = kconf_id_lookup((yyvsp[(2) - (3)].string), strlen((yyvsp[(2) - (3)].string)));
-	if (id && id->flags & TF_OPTION)
-		menu_add_option(id->token, (yyvsp[(3) - (3)].string));
-	else
-		zconfprint("warning: ignoring unknown option %s", (yyvsp[(2) - (3)].string));
-	free((yyvsp[(2) - (3)].string));
-}
-    break;
-
-  case 49:
-
-    { (yyval.string) = NULL; }
-    break;
-
-  case 50:
-
-    { (yyval.string) = (yyvsp[(2) - (2)].string); }
-    break;
-
-  case 51:
-
-    {
-	struct symbol *sym = sym_lookup((yyvsp[(2) - (3)].string), SYMBOL_CHOICE);
-	sym->flags |= SYMBOL_AUTO;
-	menu_add_entry(sym);
-	menu_add_expr(P_CHOICE, NULL, NULL);
-	printd(DEBUG_PARSE, "%s:%d:choice\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 52:
-
-    {
-	(yyval.menu) = menu_add_menu();
-}
-    break;
-
-  case 53:
-
-    {
-	if (zconf_endtoken((yyvsp[(1) - (1)].id), T_CHOICE, T_ENDCHOICE)) {
-		menu_end_menu();
-		printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
-	}
-}
-    break;
-
-  case 61:
-
-    {
-	menu_add_prompt(P_PROMPT, (yyvsp[(2) - (4)].string), (yyvsp[(3) - (4)].expr));
-	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 62:
-
-    {
-	if ((yyvsp[(1) - (3)].id)->stype == S_BOOLEAN || (yyvsp[(1) - (3)].id)->stype == S_TRISTATE) {
-		menu_set_type((yyvsp[(1) - (3)].id)->stype);
-		printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
-			zconf_curname(), zconf_lineno(),
-			(yyvsp[(1) - (3)].id)->stype);
-	} else
-		YYERROR;
-}
-    break;
-
-  case 63:
-
-    {
-	current_entry->sym->flags |= SYMBOL_OPTIONAL;
-	printd(DEBUG_PARSE, "%s:%d:optional\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 64:
-
-    {
-	if ((yyvsp[(1) - (4)].id)->stype == S_UNKNOWN) {
-		menu_add_symbol(P_DEFAULT, sym_lookup((yyvsp[(2) - (4)].string), 0), (yyvsp[(3) - (4)].expr));
-		printd(DEBUG_PARSE, "%s:%d:default\n",
-			zconf_curname(), zconf_lineno());
-	} else
-		YYERROR;
-}
-    break;
-
-  case 67:
-
-    {
-	printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
-	menu_add_entry(NULL);
-	menu_add_dep((yyvsp[(2) - (3)].expr));
-	(yyval.menu) = menu_add_menu();
-}
-    break;
-
-  case 68:
-
-    {
-	if (zconf_endtoken((yyvsp[(1) - (1)].id), T_IF, T_ENDIF)) {
-		menu_end_menu();
-		printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
-	}
-}
-    break;
-
-  case 74:
-
-    {
-	menu_add_prompt(P_MENU, (yyvsp[(2) - (3)].string), NULL);
-}
-    break;
-
-  case 75:
-
-    {
-	menu_add_entry(NULL);
-	menu_add_prompt(P_MENU, (yyvsp[(2) - (3)].string), NULL);
-	printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 76:
-
-    {
-	(yyval.menu) = menu_add_menu();
-}
-    break;
-
-  case 77:
-
-    {
-	if (zconf_endtoken((yyvsp[(1) - (1)].id), T_MENU, T_ENDMENU)) {
-		menu_end_menu();
-		printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
-	}
-}
-    break;
-
-  case 83:
-
-    {
-	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), (yyvsp[(2) - (3)].string));
-	zconf_nextfile((yyvsp[(2) - (3)].string));
-}
-    break;
-
-  case 84:
-
-    {
-	menu_add_entry(NULL);
-	menu_add_prompt(P_COMMENT, (yyvsp[(2) - (3)].string), NULL);
-	printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 85:
-
-    {
-	menu_end_entry();
-}
-    break;
-
-  case 86:
-
-    {
-	printd(DEBUG_PARSE, "%s:%d:help\n", zconf_curname(), zconf_lineno());
-	zconf_starthelp();
-}
-    break;
-
-  case 87:
-
-    {
-	current_entry->help = (yyvsp[(2) - (2)].string);
-}
-    break;
-
-  case 92:
-
-    {
-	menu_add_dep((yyvsp[(3) - (4)].expr));
-	printd(DEBUG_PARSE, "%s:%d:depends on\n", zconf_curname(), zconf_lineno());
-}
-    break;
-
-  case 96:
-
-    {
-	menu_add_visibility((yyvsp[(2) - (2)].expr));
-}
-    break;
-
-  case 98:
-
-    {
-	menu_add_prompt(P_PROMPT, (yyvsp[(1) - (2)].string), (yyvsp[(2) - (2)].expr));
-}
-    break;
-
-  case 101:
-
-    { (yyval.id) = (yyvsp[(1) - (2)].id); }
-    break;
-
-  case 102:
-
-    { (yyval.id) = (yyvsp[(1) - (2)].id); }
-    break;
-
-  case 103:
-
-    { (yyval.id) = (yyvsp[(1) - (2)].id); }
-    break;
-
-  case 106:
-
-    { (yyval.expr) = NULL; }
-    break;
-
-  case 107:
-
-    { (yyval.expr) = (yyvsp[(2) - (2)].expr); }
-    break;
-
-  case 108:
-
-    { (yyval.expr) = expr_alloc_symbol((yyvsp[(1) - (1)].symbol)); }
-    break;
-
-  case 109:
-
-    { (yyval.expr) = expr_alloc_comp(E_LTH, (yyvsp[(1) - (3)].symbol), (yyvsp[(3) - (3)].symbol)); }
-    break;
-
-  case 110:
-
-    { (yyval.expr) = expr_alloc_comp(E_LEQ, (yyvsp[(1) - (3)].symbol), (yyvsp[(3) - (3)].symbol)); }
-    break;
-
-  case 111:
-
-    { (yyval.expr) = expr_alloc_comp(E_GTH, (yyvsp[(1) - (3)].symbol), (yyvsp[(3) - (3)].symbol)); }
-    break;
-
-  case 112:
-
-    { (yyval.expr) = expr_alloc_comp(E_GEQ, (yyvsp[(1) - (3)].symbol), (yyvsp[(3) - (3)].symbol)); }
-    break;
-
-  case 113:
-
-    { (yyval.expr) = expr_alloc_comp(E_EQUAL, (yyvsp[(1) - (3)].symbol), (yyvsp[(3) - (3)].symbol)); }
-    break;
-
-  case 114:
-
-    { (yyval.expr) = expr_alloc_comp(E_UNEQUAL, (yyvsp[(1) - (3)].symbol), (yyvsp[(3) - (3)].symbol)); }
-    break;
-
-  case 115:
-
-    { (yyval.expr) = (yyvsp[(2) - (3)].expr); }
-    break;
-
-  case 116:
-
-    { (yyval.expr) = expr_alloc_one(E_NOT, (yyvsp[(2) - (2)].expr)); }
-    break;
-
-  case 117:
-
-    { (yyval.expr) = expr_alloc_two(E_OR, (yyvsp[(1) - (3)].expr), (yyvsp[(3) - (3)].expr)); }
-    break;
-
-  case 118:
-
-    { (yyval.expr) = expr_alloc_two(E_AND, (yyvsp[(1) - (3)].expr), (yyvsp[(3) - (3)].expr)); }
-    break;
-
-  case 119:
-
-    { (yyval.symbol) = sym_lookup((yyvsp[(1) - (1)].string), 0); free((yyvsp[(1) - (1)].string)); }
-    break;
-
-  case 120:
-
-    { (yyval.symbol) = sym_lookup((yyvsp[(1) - (1)].string), SYMBOL_CONST); free((yyvsp[(1) - (1)].string)); }
-    break;
-
-  case 121:
-
-    { (yyval.string) = NULL; }
-    break;
-
-
-
-      default: break;
-    }
-  /* User semantic actions sometimes alter yychar, and that requires
-     that yytoken be updated with the new translation.  We take the
-     approach of translating immediately before every use of yytoken.
-     One alternative is translating here after every semantic action,
-     but that translation would be missed if the semantic action invokes
-     YYABORT, YYACCEPT, or YYERROR immediately after altering yychar or
-     if it invokes YYBACKUP.  In the case of YYABORT or YYACCEPT, an
-     incorrect destructor might then be invoked immediately.  In the
-     case of YYERROR or YYBACKUP, subsequent parser actions might lead
-     to an incorrect destructor call or verbose syntax error message
-     before the lookahead is translated.  */
-  YY_SYMBOL_PRINT ("-> $$ =", yyr1[yyn], &yyval, &yyloc);
-
-  YYPOPSTACK (yylen);
-  yylen = 0;
-  YY_STACK_PRINT (yyss, yyssp);
-
-  *++yyvsp = yyval;
-
-  /* Now `shift' the result of the reduction.  Determine what state
-     that goes to, based on the state we popped back to and the rule
-     number reduced by.  */
-
-  yyn = yyr1[yyn];
-
-  yystate = yypgoto[yyn - YYNTOKENS] + *yyssp;
-  if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == *yyssp)
-    yystate = yytable[yystate];
-  else
-    yystate = yydefgoto[yyn - YYNTOKENS];
-
-  goto yynewstate;
-
-
-/*------------------------------------.
-| yyerrlab -- here on detecting error |
-`------------------------------------*/
-yyerrlab:
-  /* Make sure we have latest lookahead translation.  See comments at
-     user semantic actions for why this is necessary.  */
-  yytoken = yychar == YYEMPTY ? YYEMPTY : YYTRANSLATE (yychar);
-
-  /* If not already recovering from an error, report this error.  */
-  if (!yyerrstatus)
-    {
-      ++yynerrs;
-#if ! YYERROR_VERBOSE
-      yyerror (YY_("syntax error"));
-#else
-# define YYSYNTAX_ERROR yysyntax_error (&yymsg_alloc, &yymsg, \
-                                        yyssp, yytoken)
-      {
-        char const *yymsgp = YY_("syntax error");
-        int yysyntax_error_status;
-        yysyntax_error_status = YYSYNTAX_ERROR;
-        if (yysyntax_error_status == 0)
-          yymsgp = yymsg;
-        else if (yysyntax_error_status == 1)
-          {
-            if (yymsg != yymsgbuf)
-              YYSTACK_FREE (yymsg);
-            yymsg = (char *) YYSTACK_ALLOC (yymsg_alloc);
-            if (!yymsg)
-              {
-                yymsg = yymsgbuf;
-                yymsg_alloc = sizeof yymsgbuf;
-                yysyntax_error_status = 2;
-              }
-            else
-              {
-                yysyntax_error_status = YYSYNTAX_ERROR;
-                yymsgp = yymsg;
-              }
-          }
-        yyerror (yymsgp);
-        if (yysyntax_error_status == 2)
-          goto yyexhaustedlab;
-      }
-# undef YYSYNTAX_ERROR
-#endif
-    }
-
-
-
-  if (yyerrstatus == 3)
-    {
-      /* If just tried and failed to reuse lookahead token after an
-	 error, discard it.  */
-
-      if (yychar <= YYEOF)
-	{
-	  /* Return failure if at end of input.  */
-	  if (yychar == YYEOF)
-	    YYABORT;
-	}
-      else
-	{
-	  yydestruct ("Error: discarding",
-		      yytoken, &yylval);
-	  yychar = YYEMPTY;
-	}
-    }
-
-  /* Else will try to reuse lookahead token after shifting the error
-     token.  */
-  goto yyerrlab1;
-
-
-/*---------------------------------------------------.
-| yyerrorlab -- error raised explicitly by YYERROR.  |
-`---------------------------------------------------*/
-yyerrorlab:
-
-  /* Pacify compilers like GCC when the user code never invokes
-     YYERROR and the label yyerrorlab therefore never appears in user
-     code.  */
-  if (/*CONSTCOND*/ 0)
-     goto yyerrorlab;
-
-  /* Do not reclaim the symbols of the rule which action triggered
-     this YYERROR.  */
-  YYPOPSTACK (yylen);
-  yylen = 0;
-  YY_STACK_PRINT (yyss, yyssp);
-  yystate = *yyssp;
-  goto yyerrlab1;
-
-
-/*-------------------------------------------------------------.
-| yyerrlab1 -- common code for both syntax error and YYERROR.  |
-`-------------------------------------------------------------*/
-yyerrlab1:
-  yyerrstatus = 3;	/* Each real token shifted decrements this.  */
-
-  for (;;)
-    {
-      yyn = yypact[yystate];
-      if (!yypact_value_is_default (yyn))
-	{
-	  yyn += YYTERROR;
-	  if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR)
-	    {
-	      yyn = yytable[yyn];
-	      if (0 < yyn)
-		break;
-	    }
-	}
-
-      /* Pop the current state because it cannot handle the error token.  */
-      if (yyssp == yyss)
-	YYABORT;
-
-
-      yydestruct ("Error: popping",
-		  yystos[yystate], yyvsp);
-      YYPOPSTACK (1);
-      yystate = *yyssp;
-      YY_STACK_PRINT (yyss, yyssp);
-    }
-
-  *++yyvsp = yylval;
-
-
-  /* Shift the error token.  */
-  YY_SYMBOL_PRINT ("Shifting", yystos[yyn], yyvsp, yylsp);
-
-  yystate = yyn;
-  goto yynewstate;
-
-
-/*-------------------------------------.
-| yyacceptlab -- YYACCEPT comes here.  |
-`-------------------------------------*/
-yyacceptlab:
-  yyresult = 0;
-  goto yyreturn;
-
-/*-----------------------------------.
-| yyabortlab -- YYABORT comes here.  |
-`-----------------------------------*/
-yyabortlab:
-  yyresult = 1;
-  goto yyreturn;
-
-#if !defined yyoverflow || YYERROR_VERBOSE
-/*-------------------------------------------------.
-| yyexhaustedlab -- memory exhaustion comes here.  |
-`-------------------------------------------------*/
-yyexhaustedlab:
-  yyerror (YY_("memory exhausted"));
-  yyresult = 2;
-  /* Fall through.  */
-#endif
-
-yyreturn:
-  if (yychar != YYEMPTY)
-    {
-      /* Make sure we have latest lookahead translation.  See comments at
-         user semantic actions for why this is necessary.  */
-      yytoken = YYTRANSLATE (yychar);
-      yydestruct ("Cleanup: discarding lookahead",
-                  yytoken, &yylval);
-    }
-  /* Do not reclaim the symbols of the rule which action triggered
-     this YYABORT or YYACCEPT.  */
-  YYPOPSTACK (yylen);
-  YY_STACK_PRINT (yyss, yyssp);
-  while (yyssp != yyss)
-    {
-      yydestruct ("Cleanup: popping",
-		  yystos[*yyssp], yyvsp);
-      YYPOPSTACK (1);
-    }
-#ifndef yyoverflow
-  if (yyss != yyssa)
-    YYSTACK_FREE (yyss);
-#endif
-#if YYERROR_VERBOSE
-  if (yymsg != yymsgbuf)
-    YYSTACK_FREE (yymsg);
-#endif
-  /* Make sure YYID is used.  */
-  return YYID (yyresult);
-}
-
-
-
-
-
-void conf_parse(const char *name)
-{
-	struct symbol *sym;
-	int i;
-
-	zconf_initscan(name);
-
-	sym_init();
-	_menu_init();
-	rootmenu.prompt = menu_add_prompt(P_MENU, "Linux Kernel Configuration", NULL);
-
-	if (getenv("ZCONF_DEBUG"))
-		zconfdebug = 1;
-	zconfparse();
-	if (zconfnerrs)
-		exit(1);
-	if (!modules_sym)
-		modules_sym = sym_find( "n" );
-
-	rootmenu.prompt->text = rootmenu.prompt->text;
-	rootmenu.prompt->text = sym_expand_string_value(rootmenu.prompt->text);
-
-	menu_finalize(&rootmenu);
-	for_all_symbols(i, sym) {
-		if (sym_check_deps(sym))
-			zconfnerrs++;
-	}
-	if (zconfnerrs)
-		exit(1);
-	sym_set_change_count(1);
-}
-
-static const char *zconf_tokenname(int token)
-{
-	switch (token) {
-	case T_MENU:		return "menu";
-	case T_ENDMENU:		return "endmenu";
-	case T_CHOICE:		return "choice";
-	case T_ENDCHOICE:	return "endchoice";
-	case T_IF:		return "if";
-	case T_ENDIF:		return "endif";
-	case T_DEPENDS:		return "depends";
-	case T_VISIBLE:		return "visible";
-	}
-	return "<token>";
-}
-
-static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int endtoken)
-{
-	if (id->token != endtoken) {
-		zconf_error("unexpected '%s' within %s block",
-			kconf_id_strings + id->name, zconf_tokenname(starttoken));
-		zconfnerrs++;
-		return false;
-	}
-	if (current_menu->file != current_file) {
-		zconf_error("'%s' in different file than '%s'",
-			kconf_id_strings + id->name, zconf_tokenname(starttoken));
-		fprintf(stderr, "%s:%d: location of the '%s'\n",
-			current_menu->file->name, current_menu->lineno,
-			zconf_tokenname(starttoken));
-		zconfnerrs++;
-		return false;
-	}
-	return true;
-}
-
-static void zconfprint(const char *err, ...)
-{
-	va_list ap;
-
-	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
-	va_start(ap, err);
-	vfprintf(stderr, err, ap);
-	va_end(ap);
-	fprintf(stderr, "\n");
-}
-
-static void zconf_error(const char *err, ...)
-{
-	va_list ap;
-
-	zconfnerrs++;
-	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
-	va_start(ap, err);
-	vfprintf(stderr, err, ap);
-	va_end(ap);
-	fprintf(stderr, "\n");
-}
-
-static void zconferror(const char *err)
-{
-	fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
-}
-
-static void print_quoted_string(FILE *out, const char *str)
-{
-	const char *p;
-	int len;
-
-	putc('"', out);
-	while ((p = strchr(str, '"'))) {
-		len = p - str;
-		if (len)
-			fprintf(out, "%.*s", len, str);
-		fputs("\\\"", out);
-		str = p + 1;
-	}
-	fputs(str, out);
-	putc('"', out);
-}
-
-static void print_symbol(FILE *out, struct menu *menu)
-{
-	struct symbol *sym = menu->sym;
-	struct property *prop;
-
-	if (sym_is_choice(sym))
-		fprintf(out, "\nchoice\n");
-	else
-		fprintf(out, "\nconfig %s\n", sym->name);
-	switch (sym->type) {
-	case S_BOOLEAN:
-		fputs("  boolean\n", out);
-		break;
-	case S_TRISTATE:
-		fputs("  tristate\n", out);
-		break;
-	case S_STRING:
-		fputs("  string\n", out);
-		break;
-	case S_INT:
-		fputs("  integer\n", out);
-		break;
-	case S_HEX:
-		fputs("  hex\n", out);
-		break;
-	default:
-		fputs("  ???\n", out);
-		break;
-	}
-	for (prop = sym->prop; prop; prop = prop->next) {
-		if (prop->menu != menu)
-			continue;
-		switch (prop->type) {
-		case P_PROMPT:
-			fputs("  prompt ", out);
-			print_quoted_string(out, prop->text);
-			if (!expr_is_yes(prop->visible.expr)) {
-				fputs(" if ", out);
-				expr_fprint(prop->visible.expr, out);
-			}
-			fputc('\n', out);
-			break;
-		case P_DEFAULT:
-			fputs( "  default ", out);
-			expr_fprint(prop->expr, out);
-			if (!expr_is_yes(prop->visible.expr)) {
-				fputs(" if ", out);
-				expr_fprint(prop->visible.expr, out);
-			}
-			fputc('\n', out);
-			break;
-		case P_CHOICE:
-			fputs("  #choice value\n", out);
-			break;
-		case P_SELECT:
-			fputs( "  select ", out);
-			expr_fprint(prop->expr, out);
-			fputc('\n', out);
-			break;
-		case P_RANGE:
-			fputs( "  range ", out);
-			expr_fprint(prop->expr, out);
-			fputc('\n', out);
-			break;
-		case P_MENU:
-			fputs( "  menu ", out);
-			print_quoted_string(out, prop->text);
-			fputc('\n', out);
-			break;
-		default:
-			fprintf(out, "  unknown prop %d!\n", prop->type);
-			break;
-		}
-	}
-	if (menu->help) {
-		int len = strlen(menu->help);
-		while (menu->help[--len] == '\n')
-			menu->help[len] = 0;
-		fprintf(out, "  help\n%s\n", menu->help);
-	}
-}
-
-void zconfdump(FILE *out)
-{
-	struct property *prop;
-	struct symbol *sym;
-	struct menu *menu;
-
-	menu = rootmenu.list;
-	while (menu) {
-		if ((sym = menu->sym))
-			print_symbol(out, menu);
-		else if ((prop = menu->prompt)) {
-			switch (prop->type) {
-			case P_COMMENT:
-				fputs("\ncomment ", out);
-				print_quoted_string(out, prop->text);
-				fputs("\n", out);
-				break;
-			case P_MENU:
-				fputs("\nmenu ", out);
-				print_quoted_string(out, prop->text);
-				fputs("\n", out);
-				break;
-			default:
-				;
-			}
-			if (!expr_is_yes(prop->visible.expr)) {
-				fputs("  depends ", out);
-				expr_fprint(prop->visible.expr, out);
-				fputc('\n', out);
-			}
-		}
-
-		if (menu->list)
-			menu = menu->list;
-		else if (menu->next)
-			menu = menu->next;
-		else while ((menu = menu->parent)) {
-			if (menu->prompt && menu->prompt->type == P_MENU)
-				fputs("\nendmenu\n", out);
-			if (menu->next) {
-				menu = menu->next;
-				break;
-			}
-		}
-	}
-}
-
-#include "zconf.lex.c"
-#include "util.c"
-#include "confdata.c"
-#include "expr.c"
-#include "symbol.c"
-#include "menu.c"
-