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authorMasahiro Yamada <yamada.masahiro@socionext.com>2018-08-22 22:51:09 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-08-24 08:10:00 +0900
commite85d1d65cd8a9083040e280d172eba762875f8f1 (patch)
tree8038ed2a967ad92502f45a7173bdda15cfed57b7 /Makefile
parentf6f57a46435d7253a52a1a07a58183678ad266a0 (diff)
downloadlinux-e85d1d65cd8a9083040e280d172eba762875f8f1.tar.gz
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>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile8
1 files changed, 2 insertions, 6 deletions
diff --git a/Makefile b/Makefile
index c4d7b4befac6..1623b8b6e8f5 100644
--- a/Makefile
+++ b/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