forked from Minki/linux
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: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
parent
f6f57a4643
commit
e85d1d65cd
8
Makefile
8
Makefile
@ -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
|
||||
|
@ -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,
|
||||
|
Loading…
Reference in New Issue
Block a user