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Commit e85d1d65 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: test dead code/data elimination support in Kconfig 



This config option should be enabled only when both the compiler and
the linker support necessary flags.  Add proper dependencies to Kconfig.

Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
parent f6f57a46

Makefile

+2 −6
Original line number Diff line number Diff line
@@ -790,8 +790,8 @@ KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 
endif



ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-ffunction-sections,)

KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-fdata-sections,)

KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections

LDFLAGS_vmlinux += --gc-sections

endif



# arch Makefile may override CC so keep this after arch Makefile is included
@@ -857,10 +857,6 @@ LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)

LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)



ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)

endif



ifeq ($(CONFIG_STRIP_ASM_SYMS),y)

LDFLAGS_vmlinux	+= $(call ld-option, -X,)

endif

init/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -1085,6 +1085,8 @@ config LD_DEAD_CODE_DATA_ELIMINATION 
	bool "Dead code and data elimination (EXPERIMENTAL)"

	depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION

	depends on EXPERT

	depends on $(cc-option,-ffunction-sections -fdata-sections)

	depends on $(ld-option,--gc-sections)

	help

	  Enable this if you want to do dead code and data elimination with

	  the linker by compiling with -ffunction-sections -fdata-sections,