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[XEN PATCH v4 05/18] xen/build: use new $(c_flags) and $(a_flags) instead of $(CFLAGS)

From: Anthony PERARD <anthony.perard@xxxxxxxxxx>

Date: Tue, 31 Mar 2020 11:30:49 +0100

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Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>

Delivery-date: Tue, 31 Mar 2020 10:31:18 +0000

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List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

In a later patch ("xen/build: have the root Makefile generates the CFLAGS), we want to generate the CFLAGS in xen/Makefile, then export it and have Rules.mk use a CFLAGS from the environment variables. That changes the flavor of the CFLAGS and flags intended for one target (like -D__OBJECT_FILE__ and -M%) gets propagated and duplicated. So we start by moving such flags out of $(CFLAGS) and into $(c_flags) which is to be modified by only Rules.mk. __OBJECT_FILE__ is only used by arch/x86/mm/*.c files, so having it in $(c_flags) is enough, we don't need it in $(a_flags). For include/Makefile and as-insn we can keep using CFLAGS, but since it doesn't have -M* flags anymore there is no need to filter them out. The XEN_BUILD_EFI tests in arch/x86/Makefile was filtering out CFLAGS-y, but according to dd40177c1bc8 ("x86-64/EFI: add CFLAGS to check compile"), it was done to filter out -MF. CFLAGS doesn't have those flags anymore, so no filtering is needed. This is inspired by the way Kbuild generates CFLAGS for each targets. Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> --- Notes: v4: - drop change in as-insn macro, and keep filtering-out -M% %.d v3: - include/Makefile: Keep using CFLAGS, but since it doesn't have -M* flags anymore, no need to filter it. - Write c_flags and a_flags on a single line. - arch/x86/Makefile: remove the filter-out of dependency flags they are remove from CFLAGS anyway. (was intended to be done in xen/build: have the root Makefile generates the CFLAGS originally, move the change to this patch). - also modify as-insn as it is now xen/ only. xen/Rules.mk | 23 +++++++++++------------ xen/arch/arm/Makefile | 4 ++-- xen/arch/x86/Makefile | 6 +++--- xen/arch/x86/mm/Makefile | 6 +++--- xen/arch/x86/mm/hap/Makefile | 6 +++--- xen/arch/x86/mm/shadow/Makefile | 6 +++--- xen/include/Makefile | 2 +- 7 files changed, 26 insertions(+), 27 deletions(-) diff --git a/xen/Rules.mk b/xen/Rules.mk index 9079df7978a7..3408a35dbf53 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -57,7 +57,6 @@ CFLAGS += -Werror -Wredundant-decls -Wno-pointer-arith $(call cc-option-add,CFLAGS,CC,-Wvla) CFLAGS += -pipe -D__XEN__ -include $(BASEDIR)/include/xen/config.h CFLAGS-$(CONFIG_DEBUG_INFO) += -g -CFLAGS += '-D__OBJECT_FILE__="$@"' ifneq ($(CONFIG_CC_IS_CLANG),y) # Clang doesn't understand this command line argument, and doesn't appear to @@ -70,9 +69,6 @@ AFLAGS += -D__ASSEMBLY__ ALL_OBJS := $(ALL_OBJS-y) -# Get gcc to generate the dependencies for us. -CFLAGS-y += -MMD -MP -MF $(@D)/.$(@F).d - CFLAGS += $(CFLAGS-y) # allow extra CFLAGS externally via EXTRA_CFLAGS_XEN_CORE CFLAGS += $(EXTRA_CFLAGS_XEN_CORE) @@ -146,9 +142,12 @@ endif # Always build obj-bin files as binary even if they come from C source. $(obj-bin-y): CFLAGS := $(filter-out -flto,$(CFLAGS)) +c_flags = -MMD -MP -MF $(@D)/.$(@F).d $(CFLAGS) '-D__OBJECT_FILE__="$@"' +a_flags = -MMD -MP -MF $(@D)/.$(@F).d $(AFLAGS) + built_in.o: $(obj-y) $(extra-y) ifeq ($(obj-y),) - $(CC) $(CFLAGS) -c -x c /dev/null -o $@ + $(CC) $(c_flags) -c -x c /dev/null -o $@ else ifeq ($(CONFIG_LTO),y) $(LD_LTO) -r -o $@ $(filter-out $(extra-y),$^) @@ -159,7 +158,7 @@ endif built_in_bin.o: $(obj-bin-y) $(extra-y) ifeq ($(obj-bin-y),) - $(CC) $(AFLAGS) -c -x assembler /dev/null -o $@ + $(CC) $(a_flags) -c -x assembler /dev/null -o $@ else $(LD) $(LDFLAGS) -r -o $@ $(filter-out $(extra-y),$^) endif @@ -178,7 +177,7 @@ SRCPATH := $(patsubst $(BASEDIR)/%,%,$(CURDIR)) %.o: %.c Makefile ifeq ($(CONFIG_ENFORCE_UNIQUE_SYMBOLS),y) - $(CC) $(CFLAGS) -c $< -o $(@D)/.$(@F).tmp -MQ $@ + $(CC) $(c_flags) -c $< -o $(@D)/.$(@F).tmp -MQ $@ ifeq ($(CONFIG_CC_IS_CLANG),y) $(OBJCOPY) --redefine-sym $<=$(SRCPATH)/$< $(@D)/.$(@F).tmp $@ else @@ -186,11 +185,11 @@ else endif rm -f $(@D)/.$(@F).tmp else - $(CC) $(CFLAGS) -c $< -o $@ + $(CC) $(c_flags) -c $< -o $@ endif %.o: %.S Makefile - $(CC) $(AFLAGS) -c $< -o $@ + $(CC) $(a_flags) -c $< -o $@ $(filter %.init.o,$(obj-y) $(obj-bin-y) $(extra-y)): %.init.o: %.o Makefile $(OBJDUMP) -h $< | sed -n '/[0-9]/{s,00*,0,g;p;}' | while read idx name sz rest; do \ @@ -205,12 +204,12 @@ $(filter %.init.o,$(obj-y) $(obj-bin-y) $(extra-y)): %.init.o: %.o Makefile $(OBJCOPY) $(foreach s,$(SPECIAL_DATA_SECTIONS),--rename-section .$(s)=.init.$(s)) $< $@ %.i: %.c Makefile - $(CPP) $(filter-out -Wa$(comma)%,$(CFLAGS)) $< -o $@ + $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) $< -o $@ %.s: %.c Makefile - $(CC) $(filter-out -Wa$(comma)%,$(CFLAGS)) -S $< -o $@ + $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -S $< -o $@ %.s: %.S Makefile - $(CPP) $(filter-out -Wa$(comma)%,$(AFLAGS)) $< -o $@ + $(CPP) $(filter-out -Wa$(comma)%,$(a_flags)) $< -o $@ -include $(DEPS_INCLUDE) diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile index 7273f356f190..913f6cdeed3f 100644 --- a/xen/arch/arm/Makefile +++ b/xen/arch/arm/Makefile @@ -120,10 +120,10 @@ $(TARGET)-syms: prelink.o xen.lds rm -f $(@D)/.$(@F).[0-9]* asm-offsets.s: $(TARGET_SUBARCH)/asm-offsets.c - $(CC) $(filter-out -flto,$(CFLAGS)) -S -o $@ $< + $(CC) $(filter-out -flto,$(c_flags)) -S -o $@ $< xen.lds: xen.lds.S - $(CC) -P -E -Ui386 $(AFLAGS) -o $@ $< + $(CC) -P -E -Ui386 $(a_flags) -o $@ $< sed -e 's/xen\.lds\.o:/xen\.lds:/g' <.xen.lds.d >.xen.lds.d.new mv -f .xen.lds.d.new .xen.lds.d diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile index e954edbc2e0a..1405525105d9 100644 --- a/xen/arch/x86/Makefile +++ b/xen/arch/x86/Makefile @@ -168,7 +168,7 @@ EFI_LDFLAGS += --major-os-version=2 --minor-os-version=0 EFI_LDFLAGS += --major-subsystem-version=2 --minor-subsystem-version=0 # Check if the compiler supports the MS ABI. -export XEN_BUILD_EFI := $(shell $(CC) $(filter-out $(CFLAGS-y) .%.d,$(CFLAGS)) -c efi/check.c -o efi/check.o 2>/dev/null && echo y) +export XEN_BUILD_EFI := $(shell $(CC) $(CFLAGS) -c efi/check.c -o efi/check.o 2>/dev/null && echo y) # Check if the linker supports PE. XEN_BUILD_PE := $(if $(XEN_BUILD_EFI),$(shell $(LD) -mi386pep --subsystem=10 -o efi/check.efi efi/check.o 2>/dev/null && echo y)) CFLAGS-$(XEN_BUILD_EFI) += -DXEN_BUILD_EFI @@ -223,7 +223,7 @@ efi/boot.init.o efi/runtime.o efi/compat.o efi/buildid.o efi/relocs-dummy.o: $(B efi/boot.init.o efi/runtime.o efi/compat.o efi/buildid.o efi/relocs-dummy.o: ; asm-offsets.s: $(TARGET_SUBARCH)/asm-offsets.c $(BASEDIR)/include/asm-x86/asm-macros.h - $(CC) $(filter-out -Wa$(comma)% -flto,$(CFLAGS)) -S -o $@ $< + $(CC) $(filter-out -Wa$(comma)% -flto,$(c_flags)) -S -o $@ $< asm-macros.i: CFLAGS += -D__ASSEMBLY__ -P @@ -240,7 +240,7 @@ $(BASEDIR)/include/asm-x86/asm-macros.h: asm-macros.i Makefile efi.lds: AFLAGS += -DEFI xen.lds efi.lds: xen.lds.S - $(CC) -P -E -Ui386 $(filter-out -Wa$(comma)%,$(AFLAGS)) -o $@ $< + $(CC) -P -E -Ui386 $(filter-out -Wa$(comma)%,$(a_flags)) -o $@ $< sed -e 's/.*\.lds\.o:/$(@F):/g' <.$(@F).d >.$(@F).d.new mv -f .$(@F).d.new .$(@F).d diff --git a/xen/arch/x86/mm/Makefile b/xen/arch/x86/mm/Makefile index d87dc0aa6eeb..a2431fde6bb4 100644 --- a/xen/arch/x86/mm/Makefile +++ b/xen/arch/x86/mm/Makefile @@ -12,10 +12,10 @@ obj-$(CONFIG_HVM) += p2m-ept.o p2m-pod.o obj-y += paging.o guest_walk_%.o: guest_walk.c Makefile - $(CC) $(CFLAGS) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ + $(CC) $(c_flags) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ guest_walk_%.i: guest_walk.c Makefile - $(CPP) $(filter-out -Wa$(comma)%,$(CFLAGS)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ + $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ guest_walk_%.s: guest_walk.c Makefile - $(CC) $(filter-out -Wa$(comma)%,$(CFLAGS)) -DGUEST_PAGING_LEVELS=$* -S $< -o $@ + $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -S $< -o $@ diff --git a/xen/arch/x86/mm/hap/Makefile b/xen/arch/x86/mm/hap/Makefile index b14a9aff93d2..22e7ad54bd33 100644 --- a/xen/arch/x86/mm/hap/Makefile +++ b/xen/arch/x86/mm/hap/Makefile @@ -6,10 +6,10 @@ obj-y += nested_hap.o obj-y += nested_ept.o guest_walk_%level.o: guest_walk.c Makefile - $(CC) $(CFLAGS) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ + $(CC) $(c_flags) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ guest_walk_%level.i: guest_walk.c Makefile - $(CPP) $(filter-out -Wa$(comma)%,$(CFLAGS)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ + $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ guest_walk_%level.s: guest_walk.c Makefile - $(CC) $(filter-out -Wa$(comma)%,$(CFLAGS)) -DGUEST_PAGING_LEVELS=$* -S $< -o $@ + $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -S $< -o $@ diff --git a/xen/arch/x86/mm/shadow/Makefile b/xen/arch/x86/mm/shadow/Makefile index ff03a9937f9b..23d3ff10802c 100644 --- a/xen/arch/x86/mm/shadow/Makefile +++ b/xen/arch/x86/mm/shadow/Makefile @@ -7,10 +7,10 @@ obj-y += none.o endif guest_%.o: multi.c Makefile - $(CC) $(CFLAGS) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ + $(CC) $(c_flags) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ guest_%.i: multi.c Makefile - $(CPP) $(filter-out -Wa$(comma)%,$(CFLAGS)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ + $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@ guest_%.s: multi.c Makefile - $(CC) $(filter-out -Wa$(comma)%,$(CFLAGS)) -DGUEST_PAGING_LEVELS=$* -S $< -o $@ + $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -S $< -o $@ diff --git a/xen/include/Makefile b/xen/include/Makefile index 433bad9055b2..a488a98d8bb7 100644 --- a/xen/include/Makefile +++ b/xen/include/Makefile @@ -64,7 +64,7 @@ compat/%.h: compat/%.i Makefile $(BASEDIR)/tools/compat-build-header.py mv -f $@.new $@ compat/%.i: compat/%.c Makefile - $(CPP) $(filter-out -Wa$(comma)% -M% %.d -include %/include/xen/config.h,$(CFLAGS)) $(cppflags-y) -o $@ $< + $(CPP) $(filter-out -Wa$(comma)% -include %/include/xen/config.h,$(CFLAGS)) $(cppflags-y) -o $@ $< compat/%.c: public/%.h xlat.lst Makefile $(BASEDIR)/tools/compat-build-source.py mkdir -p $(@D) -- Anthony PERARD

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