Adding Kbuild CFLAGS.
This commit adds all Kbuild CFLAGS to build the kernel binary. Signed-off-by: Juan Manuel Cruz <juan.m.cruz.alcaraz@linux.intel.com> Change-Id: Ia4ca1b71b4e68c4515c428147a8814ca983bb541
This commit is contained in:
Juan Manuel Cruz
Anas Nashif
parent
ce3533a476
commit
a0b5466540
3 changed files with 92 additions and 80 deletions
142
Makefile
142
Makefile
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@ -383,40 +383,48 @@ CFLAGS_KERNEL =
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AFLAGS_KERNEL =
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CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
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STDINCLUDE := -I$(srctree)/lib/libc/minimal/include
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# Use USERINCLUDE when you must reference the UAPI directories only.
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USERINCLUDE := \
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-I$(srctree)/arch/$(hdr-arch)/include/uapi \
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-Iarch/$(hdr-arch)/include/generated/uapi \
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-I$(srctree)/include/uapi \
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-Iinclude/generated/uapi \
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-include $(srctree)/include/linux/kconfig.h
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USERINCLUDE := -include $(CURDIR)/include/generated/autoconf.h
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PROJECTINCLUDE := $(strip -I$(srctree)/include/microkernel \
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-I$(CURDIR)/misc/generated/nodes) \
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$(USERINCLUDE)
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# Use LINUXINCLUDE when you must reference the include/ directory.
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# Needed to be compatible with the O= option
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LINUXINCLUDE := \
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-I$(srctree)/arch/$(hdr-arch)/include \
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-Iarch/$(hdr-arch)/include/generated/uapi \
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-Iarch/$(hdr-arch)/include/generated \
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$(if $(KBUILD_SRC), -I$(srctree)/include) \
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-Iinclude \
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$(USERINCLUDE)
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-I$(srctree)/include \
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-I$(CURDIR)/include/generated \
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$(USERINCLUDE) \
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$(STDINCLUDE)
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KBUILD_CPPFLAGS := -D__KERNEL__
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KBUILD_CPPFLAGS := -DKERNEL
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KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
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-fno-strict-aliasing -fno-common \
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-Werror-implicit-function-declaration \
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-Wno-format-security \
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-std=gnu89
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DEFAULTFLAGS ?= -c -g -Os -std=c99
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KBUILD_CFLAGS := $(DEFAULTFLAGS) \
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-fno-reorder-functions \
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-fno-asynchronous-unwind-tables \
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-fno-omit-frame-pointer \
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-fno-defer-pop -Wall \
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-Wno-unused-but-set-variable \
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-Wno-main -ffreestanding
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KBUILD_AFLAGS_KERNEL :=
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KBUILD_CFLAGS_KERNEL :=
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KBUILD_AFLAGS := -D__ASSEMBLY__
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KBUILD_AFLAGS := -c -g -xassembler-with-cpp
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KBUILD_AFLAGS_MODULE := -DMODULE
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KBUILD_CFLAGS_MODULE := -DMODULE
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KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
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LDFLAGS += $(call cc-ldoption,-nostartfiles)
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LDFLAGS += $(call cc-ldoption,-nodefaultlibs)
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LDFLAGS += $(call cc-ldoption,-nostdlib)
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LDFLAGS += $(call cc-ldoption,-static)
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# Read KERNELRELEASE from include/config/kernel.release (if it exists)
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KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
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KERNELVERSION = $(VERSION_GENERATION).$(VERSION_MAJOR).$(VERSION_MINOR).$(VERSION_REVISION)
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@ -433,7 +441,7 @@ export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
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export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
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export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
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export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
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export KBUILD_ARFLAGS
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export KBUILD_ARFLAGS PROJECTINCLUDE
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# When compiling out-of-tree modules, put MODVERDIR in the module
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# tree rather than in the kernel tree. The kernel tree might
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@ -613,7 +621,7 @@ endif # $(dot-config)
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#File that includes all prepare special embedded architecture targets.
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include $(srctree)/scripts/Makefile.preparch
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sinclude $(srctree)/scripts/Makefile.${SRCARCH}.preparch
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sinclude $(srctree)/scripts/Makefile.$(SRCARCH).preparch
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# The all: target is the default when no target is given on the
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# command line.
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@ -643,9 +651,11 @@ KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
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$(call cc-option,-fno-partial-inlining)
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endif
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ifneq ($(CONFIG_FRAME_WARN),0)
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KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
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endif
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ISA_FLAG=$(ISA_FLAG_$(CONFIG_BSP))
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STACK_CANARIES_FLAG_y = $(call cc-option,-fstack-protector-all,)
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STACK_CANARIES_FLAG_ = $(call cc-option,-fno-stack-protector,)
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STACK_CANARIES_FLAG = $(STACK_CANARIES_FLAG_$(CONFIG_STACK_CANARIES))
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# Handle stack protector mode.
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#
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@ -684,57 +694,22 @@ endif
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endif
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KBUILD_CFLAGS += $(stackp-flag)
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ifeq ($(COMPILER),clang)
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KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
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KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
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KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
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KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
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KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
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# Quiet clang warning: comparison of unsigned expression < 0 is always false
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KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
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# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
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# source of a reference will be _MergedGlobals and not on of the whitelisted names.
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# See modpost pattern 2
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KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
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KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
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else
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export x86_FLAGS arm_FLAGS arc_FLAGS LDFLAG_LINKERCMD
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# This warning generated too much noise in a regular build.
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# Use make W=1 to enable this warning (see scripts/Makefile.build)
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KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
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endif
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ARCHFLAGS = $($(SRCARCH)_FLAGS)
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ifdef CONFIG_FRAME_POINTER
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KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
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# Some targets (ARM with Thumb2, for example), can't be built with frame
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# pointers. For those, we don't have FUNCTION_TRACER automatically
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# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
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# incompatible with -fomit-frame-pointer with current GCC, so we don't use
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# -fomit-frame-pointer with FUNCTION_TRACER.
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ifndef CONFIG_FUNCTION_TRACER
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KBUILD_CFLAGS += -fomit-frame-pointer
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endif
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endif
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KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
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KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
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else
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KBUILD_CFLAGS += -g
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endif
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KBUILD_AFLAGS += -Wa,-gdwarf-2
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endif
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ifdef CONFIG_DEBUG_INFO_DWARF4
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KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
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endif
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KBUILD_CFLAGS += $(SSE_FP_MATH_FLAG) \
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$(ISA_FLAG) \
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$(STACK_CANARIES_FLAG) \
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$(ARCHFLAGS)
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ifdef CONFIG_DEBUG_INFO_REDUCED
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KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
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$(call cc-option,-fno-var-tracking)
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endif
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KBUILD_CFLAGS += $(CFLAGS)
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KBUILD_AFLAGS += $(ARCHFLAGS) $(ISA_FLAG=)
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KBUILD_AFLAGS += $(CFLAGS)
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ifdef CONFIG_FUNCTION_TRACER
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ifdef CONFIG_HAVE_FENTRY
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@ -755,6 +730,13 @@ ifdef CONFIG_DEBUG_SECTION_MISMATCH
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KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
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endif
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# Adding specific KBUILD_CFLAGS. This one is an specific example of how to set up KBUILD flags
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KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
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KBUILD_ARFLAGS := $(call ar-option,D)
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#FIXME This group of flags are under review
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ifdef REVIEW_BLOCK
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# arch Makefile may override CC so keep this after arch Makefile is included
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NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
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CHECKFLAGS += $(NOSTDINC_FLAGS)
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@ -779,15 +761,11 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
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# Prohibit date/time macros, which would make the build non-deterministic
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KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
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endif
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# use the deterministic mode of AR if available
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KBUILD_ARFLAGS := $(call ar-option,D)
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# check for 'asm goto'
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ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
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KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
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endif
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include $(srctree)/scripts/Makefile.extrawarn
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# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
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@ -796,14 +774,16 @@ KBUILD_AFLAGS += $(KAFLAGS)
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KBUILD_CFLAGS += $(KCFLAGS)
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# Use --build-id when available.
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LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
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$(call cc-ldoption, -Wl$(comma)--build-id,))
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KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
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LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
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ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
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LDFLAGS_vmlinux += $(call ld-option, -X,)
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endif
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LDFLAGS_vmlinux += $(call cc-ldoption,-nostartfiles)
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LDFLAGS_vmlinux += $(call cc-ldoption,-nodefaultlibs)
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LDFLAGS_vmlinux += $(call cc-ldoption,-nostdlib)
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LDFLAGS_vmlinux += $(call cc-ldoption,-static)
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LDFLAGS_vmlinux += $(call cc-ldoption,-Wl$(comma)--unresolved-symbols=ignore-in-object-files)
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LDFLAGS_vmlinux += $(call cc-ldoption,-Wl$(comma)-X)
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LDFLAGS_vmlinux += $(call cc-ldoption,-Wl$(comma)-N)
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LDFLAGS_vmlinux += $(call cc-ldoption,-Wl$(comma)--gc-sections)
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LDFLAGS_vmlinux += $(call cc-ldoption,-Wl$(comma)--build-id=none)
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# Default kernel image to build when no specific target is given.
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# KBUILD_IMAGE may be overruled on the command line or
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@ -908,9 +888,11 @@ libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
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libs-y := $(libs-y1) $(libs-y2)
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# Externally visible symbols (used by link-vmlinux.sh)
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DQUOTE = "
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#This comment line is to fix the highlighting of some editors due the quote effect."
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export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
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export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(bsp-y)
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export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
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export KBUILD_LDS := $(srctree)/arch/$(SRCARCH)/$(subst $(DQUOTE),,$(CONFIG_BSP_DIR))/linker.cmd
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export LDFLAGS_vmlinux
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# used by scripts/pacmage/Makefile
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export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
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@ -1035,7 +1017,7 @@ define filechk_utsrelease.h
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(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
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endef
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KERNEL_VERSION_HEX=0x${VERSION_GENERATION}${VERSION_MAJOR}${VERSION_MINOR}${VERSION_REVISION}
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KERNEL_VERSION_HEX=0x$(VERSION_GENERATION)$(VERSION_MAJOR)$(VERSION_MINOR)$(VERSION_REVISION)
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KERNEL_CODE=40
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define filechk_version.h
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8
scripts/Makefile.arm.preparch
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8
scripts/Makefile.arm.preparch
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@ -0,0 +1,8 @@
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LTO_FLAG-y = $(call cc-option,-flto,)
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SECTION_GC_FLAG-y = $(call cc-option,-ffunction-sections,) $(call cc-option,-fdata-sections,)
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SECTION_GC_FLAG = $(SECTION_GC_FLAG-$(CONFIG_SECTION_GARBAGE_COLLECTION))
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arm_FLAGS = $(call cc-option,-mthumb,)
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arm_FLAGS += -DVXMICRO_ARCH_arm
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arm_FLAGS += -DVXMICRO_ARCH=arm
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arm_FLAGS += $(SECTION_GC_FLAG)
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arm_FLAGS += $(LTO_FLAG-$(CONFIG_LTO))
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22
scripts/Makefile.x86.preparch
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22
scripts/Makefile.x86.preparch
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@ -0,0 +1,22 @@
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PERF_OPT_FLAG-y = -DPERF_OPT
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ALIGN_STACK_FLAG- = -mpreferred-stack-boundary=2
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SECTION_GC_FLAG-y = $(call cc-option,-ffunction-sections,) $(call cc-option,-fdata-sections,)
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LTO_FLAG-y = $(call cc-option,-flto,)
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PERF_OPT=$(if $(filter -Os,$(DEFAULTFLAGS)),,y),)
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PERF_OPT_FLAG = $(PERF_OPT_FLAG-$(PERF_OPT))
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ALIGN_STACK_FLAG = $(ALIGN_STACK_FLAG-$(PERF_OPT))
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SECTION_GC_FLAG = $(SECTION_GC_FLAG-$(CONFIG_SECTION_GARBAGE_COLLECTION))
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LTO_FLAG = $(LTO_FLAG-$(CONFIG_LTO))
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x86_FLAGS = -DVXMICRO_ARCH_x86
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x86_FLAGS += -DVXMICRO_ARCH=x86
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x86_FLAGS += $(ALIGN_STACK_FLAG)
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x86_FLAGS += $(SECTION_GC_FLAG)
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x86_FLAGS += $(LTO_FLAG)
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x86_FLAGS += $(LTO_FLAG)
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x86_FLAGS += $(PERF_OPT_FLAG)
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ISA_FLAG_pentium4 = $(call cc-option,-march=pentium4,)
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ISA_FLAG_minuteia = $(call cc-option,-march=pentium,)
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ISA_FLAG_atom_n28xx = $(call cc-option,-march=atom,) $(call cc-option,-mtune=atom,)
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export ISA_FLAG_pentium4 ISA_FLAG_minuteia ISA_FLAG_atom_n28xx
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