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

endif





ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

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

KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections

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

LDFLAGS_vmlinux += --gc-sections

endif

endif





# arch Makefile may override CC so keep this after arch Makefile is included

# 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)

KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)

LDFLAGS_vmlinux += $(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)

ifeq ($(CONFIG_STRIP_ASM_SYMS),y)

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

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

endif

endif

init/Kconfig

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

	bool "Dead code and data elimination (EXPERIMENTAL)"

	depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION

	depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION

	depends on EXPERT

	depends on EXPERT

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

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

	help

	help

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

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

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

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