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Smith" , Julien Grall , Andrew Cooper , George Dunlap , Julien Grall , Stefano Stabellini , Wei Liu , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , "Konrad Rzeszutek Wilk" , Ross Lagerwall , Daniel De Graaf Subject: [XEN PATCH v10 7/7] build: adding out-of-tree support to the xen build Date: Tue, 22 Mar 2022 11:22:38 +0000 Message-ID: <20220322112238.1117737-8-anthony.perard@citrix.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220322112238.1117737-1-anthony.perard@citrix.com> References: <20220322112238.1117737-1-anthony.perard@citrix.com> MIME-Version: 1.0 This implement out-of-tree support, there's two ways to create an out-of-tree build tree (after that, `make` in that new directory works): make O=build mkdir build; cd build; make -f ../Makefile also works with an absolute path for both. This implementation only works if the source tree is clean, as we use VPATH. This patch copies most new code with handling out-of-tree build from Linux v5.12. Signed-off-by: Anthony PERARD Acked-by: Jan Beulich Reviewed-by: Daniel P. Smith Acked-by: Julien Grall Tested-by: Julien Grall Acked-by: Ross Lagerwall (livepatch parts) --- Notes: v10: - rebased v9: - acked - add "source -> ." symlink in the in-tree build as well. This allow to make relative symlink to the "common/efi/*.c" sources. - also now, the "source" symlink is removed on `distclean`, add added to .gitignore. v8: - replace script/mkmakefile by cmd_makefile like it's been done in Linux 5.13. - fix GNU Make version, replace few 0.81 by 3.81. - reorder include header path in CFLAGS ( -I ), to have the $(objtree) paths listed before the $(srctree) paths. This will be usefull later if we allow to build out-of-tree from a dirty source tree. - make use of -iquote - sometime, add -iquote path even when not necessary when building in-tree. - extract code movement into a separate patch - make use of the new "$(srcdir)" shortcut - split command line in headers*.chk target into more lines .gitignore | 1 + xen/Makefile | 143 +++++++++++++++++++++++++++++++---- xen/Rules.mk | 11 ++- xen/arch/x86/arch.mk | 5 +- xen/arch/x86/boot/Makefile | 6 ++ xen/common/efi/efi-common.mk | 3 +- xen/include/Makefile | 11 ++- xen/test/livepatch/Makefile | 2 + xen/xsm/flask/Makefile | 3 +- xen/xsm/flask/ss/Makefile | 1 + 10 files changed, 164 insertions(+), 22 deletions(-) diff --git a/.gitignore b/.gitignore index d425be4bd9d7..c6d2c4b4f1e9 100644 --- a/.gitignore +++ b/.gitignore @@ -325,6 +325,7 @@ xen/include/xen/*.new xen/include/xen/acm_policy.h xen/include/xen/compile.h xen/include/xen/lib/x86/cpuid-autogen.h +xen/source xen/test/livepatch/config.h xen/test/livepatch/expect_config.h xen/test/livepatch/*.livepatch diff --git a/xen/Makefile b/xen/Makefile index 889d91c68a42..11057318e875 100644 --- a/xen/Makefile +++ b/xen/Makefile @@ -1,3 +1,7 @@ +# $(lastword,) for GNU Make older than 3.81 +lastword = $(word $(words $(1)),$(1)) +this-makefile := $(call lastword,$(MAKEFILE_LIST)) + # This is the correct place to edit the build version. # All other places this is stored (eg. compile.h) should be autogenerated. export XEN_VERSION = 4 @@ -19,6 +23,13 @@ export PYTHON ?= $(PYTHON_INTERPRETER) export CHECKPOLICY ?= checkpolicy +$(if $(filter __%, $(MAKECMDGOALS)), \ + $(error targets prefixed with '__' are only for internal use)) + +# That's our default target when none is given on the command line +PHONY := __all +__all: + # Do not use make's built-in rules and variables MAKEFLAGS += -rR @@ -37,9 +48,6 @@ export CC CXX LD NM OBJCOPY OBJDUMP export TARGET := xen -.PHONY: default -default: build - .PHONY: dist dist: install @@ -118,16 +126,88 @@ endif export quiet Q KBUILD_VERBOSE +# $(realpath,) for GNU Make older than 3.81 +realpath = $(wildcard $(foreach file,$(1),$(shell cd -P $(dir $(file)) && echo "$$PWD/$(notdir $(file))"))) + +ifeq ("$(origin O)", "command line") + KBUILD_OUTPUT := $(O) +endif + +ifneq ($(KBUILD_OUTPUT),) +# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot +# expand a shell special character '~'. We use a somewhat tedious way here. +abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) +$(if $(abs_objtree),, \ + $(error failed to create output directory "$(KBUILD_OUTPUT)")) + +# $(realpath ...) resolves symlinks +abs_objtree := $(call realpath,$(abs_objtree)) +else abs_objtree := $(CURDIR) -abs_srctree := $(CURDIR) +endif + +ifeq ($(abs_objtree),$(CURDIR)) +# Suppress "Entering directory ..." unless we are changing the work directory. +MAKEFLAGS += --no-print-directory +else +need-sub-make := 1 +endif + +abs_srctree := $(call realpath,$(dir $(this-makefile))) + +ifneq ($(words $(subst :, ,$(abs_srctree))), 1) +$(error source directory cannot contain spaces or colons) +endif + +ifneq ($(abs_srctree),$(abs_objtree)) +# Look for make include files relative to root of kernel src +# +# This does not become effective immediately because MAKEFLAGS is re-parsed +# once after the Makefile is read. We need to invoke sub-make. +MAKEFLAGS += --include-dir=$(abs_srctree) +need-sub-make := 1 +endif export abs_srctree abs_objtree +export root-make-done := y + +ifeq ($(need-sub-make),1) + +PHONY += $(MAKECMDGOALS) __sub-make + +$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make + @: + +# Invoke a second make in the output directory, passing relevant variables +__sub-make: + $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) + +endif # need-sub-make +endif # root-make-done + +# We process the rest of the Makefile if this is the final invocation of make +ifeq ($(need-sub-make),) + +ifeq ($(abs_srctree),$(abs_objtree)) + # building in the source tree + srctree := . + building_out_of_srctree := +else + ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) + # building in a subdirectory of the source tree + srctree := .. + else + srctree := $(abs_srctree) + endif + building_out_of_srctree := 1 +endif -srctree := . objtree := . -export srctree objtree +VPATH := $(srctree) + +export building_out_of_srctree srctree objtree VPATH -export XEN_ROOT := $(CURDIR)/.. +export XEN_ROOT := $(abs_srctree)/.. # To make sure we do not include .config for any of the *config targets # catch them early, and hand them over to tools/kconfig/Makefile @@ -204,9 +284,6 @@ endif export XEN_HAS_CHECKPOLICY := $(call success,$(CHECKPOLICY) -h 2>&1 | grep -q xen) -export root-make-done := y -endif # root-make-done - # =========================================================================== # Rules shared between *config targets and build targets @@ -214,6 +291,37 @@ PHONY += tools_fixdep tools_fixdep: $(Q)$(MAKE) $(build)=tools tools/fixdep +PHONY += outputmakefile +# Before starting out-of-tree build, make sure the source tree is clean. +# outputmakefile generates a Makefile in the output directory, if using a +# separate output directory. This allows convenient use of make in the +# output directory. +# At the same time when output Makefile generated, generate .gitignore to +# ignore whole output directory + +quiet_cmd_makefile = GEN Makefile +cmd_makefile = { \ + echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ + echo "include $(srctree)/Makefile"; \ + } > Makefile + +outputmakefile: + $(Q)ln -fsn $(srctree) source +ifdef building_out_of_srctree + $(Q)if [ -f $(srctree)/.config -o \ + -d $(srctree)/include/config -o \ + -d $(srctree)/include/generated ]; then \ + echo >&2 "***"; \ + echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin XEN_TARGET_ARCH)), XEN_TARGET_ARCH=$(XEN_TARGET_ARCH)) distclean'"; \ + echo >&2 "*** in $(abs_srctree)";\ + echo >&2 "***"; \ + false; \ + fi + $(call cmd,makefile) + $(Q)test -e .gitignore || \ + { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore +endif + ifeq ($(config-build),y) # =========================================================================== # *config targets only - make sure prerequisites are updated, and descend @@ -229,13 +337,13 @@ filechk_kconfig_allconfig = \ .allconfig.tmp: FORCE set -e; { $(call filechk_kconfig_allconfig); } > $@ -config: tools_fixdep FORCE +config: tools_fixdep outputmakefile FORCE $(Q)$(MAKE) $(build)=tools/kconfig $@ # Config.mk tries to include .config file, don't try to remake it %/.config: ; -%config: .allconfig.tmp tools_fixdep FORCE +%config: .allconfig.tmp tools_fixdep outputmakefile FORCE $(Q)$(MAKE) $(build)=tools/kconfig KCONFIG_ALLCONFIG=$< $@ else # !config-build @@ -312,6 +420,10 @@ CFLAGS += -flto LDFLAGS-$(CONFIG_CC_IS_CLANG) += -plugin LLVMgold.so endif +ifdef building_out_of_srctree + CFLAGS += -I$(objtree)/include + CFLAGS += -I$(objtree)/arch/$(TARGET_ARCH)/include +endif CFLAGS += -I$(srctree)/include CFLAGS += -I$(srctree)/arch/$(TARGET_ARCH)/include @@ -335,6 +447,8 @@ export CFLAGS_UBSAN endif # need-config +__all: build + main-targets := build install uninstall clean distclean MAP .PHONY: $(main-targets) ifneq ($(XEN_TARGET_ARCH),x86_32) @@ -431,13 +545,13 @@ _clean: .PHONY: _distclean _distclean: clean - rm -f tags TAGS cscope.files cscope.in.out cscope.out cscope.po.out GTAGS GPATH GRTAGS GSYMS .config + rm -f tags TAGS cscope.files cscope.in.out cscope.out cscope.po.out GTAGS GPATH GRTAGS GSYMS .config source $(TARGET).gz: $(TARGET) gzip -n -f -9 < $< > $@.new mv $@.new $@ -$(TARGET): FORCE +$(TARGET): outputmakefile FORCE $(Q)$(MAKE) $(build)=tools $(Q)$(MAKE) $(build)=. include/xen/compile.h $(Q)$(MAKE) $(build)=include all @@ -506,6 +620,7 @@ cloc: done | cloc --list-file=- endif #config-build +endif # need-sub-make PHONY += FORCE FORCE: diff --git a/xen/Rules.mk b/xen/Rules.mk index 57a029455586..70b7489ea89b 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -37,7 +37,7 @@ SPECIAL_DATA_SECTIONS := rodata $(foreach a,1 2 4 8 16, \ $(foreach r,rel rel.ro,data.$(r).local) # The filename build.mk has precedence over Makefile -include $(firstword $(wildcard $(src)/build.mk) $(src)/Makefile) +include $(firstword $(wildcard $(srcdir)/build.mk) $(srcdir)/Makefile) # Linking # --------------------------------------------------------------------------- @@ -328,6 +328,15 @@ existing-targets := $(wildcard $(sort $(targets))) -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) +# Create directories for object files if they do not exist +obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets)))) +# If targets exist, their directories apparently exist. Skip mkdir. +existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets)))) +obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs))) +ifneq ($(obj-dirs),) +$(shell mkdir -p $(obj-dirs)) +endif + # Declare the contents of the PHONY variable as phony. We keep that # information in a variable so we can use it in if_changed and friends. .PHONY: $(PHONY) diff --git a/xen/arch/x86/arch.mk b/xen/arch/x86/arch.mk index cfde143053fc..fce2ef5b6732 100644 --- a/xen/arch/x86/arch.mk +++ b/xen/arch/x86/arch.mk @@ -77,6 +77,9 @@ ifneq ($(CONFIG_PV_SHIM_EXCLUSIVE),y) efi-check := arch/x86/efi/check +# Create the directory for out-of-tree build +$(shell mkdir -p $(dir $(efi-check))) + # Check if the compiler supports the MS ABI. XEN_BUILD_EFI := $(call if-success,$(CC) $(CFLAGS) -c $(srctree)/$(efi-check).c -o $(efi-check).o,y) @@ -116,4 +119,4 @@ export EFI_LDFLAGS endif # Set up the assembler include path properly for older toolchains. -CFLAGS += -Wa,-I$(srctree)/include +CFLAGS += -Wa,-I$(objtree)/include -Wa,-I$(srctree)/include diff --git a/xen/arch/x86/boot/Makefile b/xen/arch/x86/boot/Makefile index ca8001c72b23..784655f5e2bd 100644 --- a/xen/arch/x86/boot/Makefile +++ b/xen/arch/x86/boot/Makefile @@ -7,11 +7,17 @@ targets += $(head-srcs:.S=.o) head-srcs := $(addprefix $(obj)/, $(head-srcs)) +ifdef building_out_of_srctree +$(obj)/head.o: CFLAGS-y += -iquote $(obj) +endif $(obj)/head.o: $(head-srcs) CFLAGS_x86_32 := $(subst -m64,-m32 -march=i686,$(XEN_TREEWIDE_CFLAGS)) $(call cc-options-add,CFLAGS_x86_32,CC,$(EMBEDDED_EXTRA_CFLAGS)) CFLAGS_x86_32 += -Werror -fno-builtin -g0 -msoft-float +ifdef building_out_of_srctree +CFLAGS_x86_32 += -I$(objtree)/include +endif CFLAGS_x86_32 += -I$(srctree)/include # override for 32bit binaries diff --git a/xen/common/efi/efi-common.mk b/xen/common/efi/efi-common.mk index 960d44a6d55b..4298ceaee71d 100644 --- a/xen/common/efi/efi-common.mk +++ b/xen/common/efi/efi-common.mk @@ -3,12 +3,13 @@ EFIOBJ-$(CONFIG_COMPAT) += compat.o CFLAGS-y += -fshort-wchar CFLAGS-y += -iquote $(srctree)/common/efi +CFLAGS-y += -iquote $(srcdir) # Part of the command line transforms $(obj) # e.g.: It transforms "dir/foo/bar" into successively # "dir foo bar", ".. .. ..", "../../.." $(obj)/%.c: $(srctree)/common/efi/%.c FORCE - $(Q)ln -nfs $(subst $(space),/,$(patsubst %,..,$(subst /, ,$(obj))))/common/efi/$(> $@.new;) mv $@.new $@ @@ -129,8 +130,9 @@ $(obj)/headers++.chk: $(PUBLIC_HEADERS) $(srcdir)/Makefile $(foreach i, $(filter %.h,$^), \ echo "#include "\"$(i)\" \ | $(CXX) -x c++ -std=gnu++98 -Wall -Werror -D__XEN_TOOLS__ \ - -include stdint.h -include $(src)/public/xen.h \ - $(foreach j, $($(i)-prereq), -include c$(j)) -S -o /dev/null - \ + -include stdint.h -include $(srcdir)/public/xen.h \ + $(foreach j, $($(patsubst $(srctree)/%,%,$i)-prereq), -include c$(j)) \ + -S -o /dev/null - \ || exit $$?; echo $(i) >> $@.new;) mv $@.new $@ @@ -139,7 +141,8 @@ endif ifeq ($(XEN_TARGET_ARCH),x86_64) .PHONY: lib-x86-all lib-x86-all: - $(MAKE) -C $(obj)/xen/lib/x86 all + @mkdir -p $(obj)/xen/lib/x86 + $(MAKE) -C $(obj)/xen/lib/x86 -f $(abs_srctree)/$(src)/xen/lib/x86/Makefile all all: lib-x86-all endif diff --git a/xen/test/livepatch/Makefile b/xen/test/livepatch/Makefile index ddb07371315e..c258ab0b5940 100644 --- a/xen/test/livepatch/Makefile +++ b/xen/test/livepatch/Makefile @@ -11,6 +11,8 @@ endif CODE_ADDR=$(shell nm --defined $(1) | grep $(2) | awk '{print "0x"$$1}') CODE_SZ=$(shell nm --defined -S $(1) | grep $(2) | awk '{ print "0x"$$2}') +CFLAGS-y += -iquote $(obj) + extra-y += xen_hello_world.livepatch xen_hello_world-objs := xen_hello_world_func.o xen_hello_world.o note.o xen_note.o modinfo.o $(obj)/xen_hello_world.o: $(obj)/config.h diff --git a/xen/xsm/flask/Makefile b/xen/xsm/flask/Makefile index a99038cb5722..d25312f4fa1c 100644 --- a/xen/xsm/flask/Makefile +++ b/xen/xsm/flask/Makefile @@ -4,7 +4,8 @@ obj-y += flask_op.o obj-y += ss/ -CFLAGS-y += -I$(obj)/include +CFLAGS-y += -iquote $(obj)/include +CFLAGS-y += -I$(srcdir)/include AWK = awk diff --git a/xen/xsm/flask/ss/Makefile b/xen/xsm/flask/ss/Makefile index aba1339f3808..ffe92ec19ed6 100644 --- a/xen/xsm/flask/ss/Makefile +++ b/xen/xsm/flask/ss/Makefile @@ -8,4 +8,5 @@ obj-y += services.o obj-y += conditional.o obj-y += mls.o +CFLAGS-y += -iquote $(objtree)/xsm/flask/include CFLAGS-y += -I$(srctree)/xsm/flask/include