[XEN,v10,0/7] xen: Build system improvements, now with out-of-tree build!

Message

Anthony PERARD March 22, 2022, 11:22 a.m. UTC

Patch series available in this git branch:
https://xenbits.xen.org/git-http/people/aperard/xen-unstable.git br.build-system-xen-v10

v10:
    Mainly a rebase (changes needed in patches 1 and 3).
    One comment change in patch 1.

v9:
    One new patch (patch 3).
    Otherwise, detailed change logs in patches.

    Removed the rfc part about doing out-of-tree build without setting VPATH
    (which would have allowed mixed in-tree / out-of-tree builds).

v8:
    Mostly rework of v7. With many patch already applied.
    Some detail changes that are spread through many patches:
    - `make cloc` recipe should now work throughout the series, update of it is
      done in 3 patches.
    - new patch "build: fix enforce unique symbols for recent clang version"
      to fix an issue with clang.
    - introducing $(srctree) and $(objtree) earlier
    - introducing $(srcdir) as shortcut for $(srctree)/$(src)
    - introduce usage of -iquote instead of -I in some cases
    More detail change log can be found in patches notes.

    Also this v8 present a work-in-progress of the ability to do out-of-tree
    build without setting VPATH. This is presented as an alternative to force
    use of out-of-tree build. As the last patch show, it allows to build the
    xen-shim without the linkfarm and we don't need to make any other changes
    to any thing that build xen (osstest, distribution packages, xen.git, ...,
    and developers finger macros). The patches are only there as WIP / RFC as
    they were some concern about the usefulness and extra changes needed.
    We can decide whether those changes are good or if this is too much and we
    should force out-of-tree build for the hypervisor.

v7:
    Out-of-tree build!

    This mean many more patches. Everything after patch 27 is new.

    There's a few new patch before that, but otherwise are rework of v6.

Hi,

I have work toward building Xen (the hypervisor) with Linux's build system,
Kbuild.

The main reason for that is to be able to have out-of-tree build. It's annoying
when a build fail because of the pvshim. Other benefit is a much faster
rebuild, and `make clean` doesn't take ages, and better dependencies to figure
out what needs to be rebuild.

Cheers,

Anthony PERARD (7):
  build: grab common EFI source files in arch specific dir
  build: replace $(BASEDIR) by $(objtree)
  build: replace $(BASEDIR) and use $(srctree)
  build: rework "headers*.chk" prerequisite in include/
  build: specify source tree in include/ for prerequisite
  build: shuffle main Makefile
  build: adding out-of-tree support to the xen build

 .gitignore                   |   1 +
 xen/Kconfig                  |   4 +-
 xen/Makefile                 | 187 +++++++++++++++++++++++++++--------
 xen/Rules.mk                 |  22 ++++-
 xen/arch/arm/Makefile        |  10 +-
 xen/arch/arm/efi/Makefile    |   4 +-
 xen/arch/x86/Makefile        |  32 +++---
 xen/arch/x86/arch.mk         |   7 +-
 xen/arch/x86/boot/Makefile   |   6 ++
 xen/arch/x86/efi/Makefile    |   5 +-
 xen/build.mk                 |   4 +-
 xen/common/Makefile          |   4 +-
 xen/common/efi/efi-common.mk |  16 +++
 xen/common/libfdt/Makefile   |   2 +-
 xen/include/Makefile         |  60 ++++++-----
 xen/scripts/Kconfig.include  |   2 +-
 xen/scripts/Makefile.clean   |   5 +-
 xen/test/livepatch/Makefile  |  14 +--
 xen/xsm/flask/Makefile       |  13 +--
 xen/xsm/flask/ss/Makefile    |   1 +
 20 files changed, 283 insertions(+), 116 deletions(-)
 create mode 100644 xen/common/efi/efi-common.mk