Messages in this thread Patch in this message | | | From | Rabin Vincent <> | Subject | [PATCH 1/2] Makefile: evaluate LDFLAGS_BUILD_ID only once | Date | Mon, 27 Jun 2016 20:28:26 +0200 |
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Evaluate LDFLAGS_BUILD_ID (which involves invoking the compiler) only once instead of over and over.
This provides a 20% reduction in null build time with x86 allnoconfig on my machine:
$ make -j8 && perf stat -r5 make -j8 Before: 1,086617617 seconds time elapsed ( +- 0,37% ) After: 0,864487173 seconds time elapsed ( +- 0,35% )
Signed-off-by: Rabin Vincent <rabin@rab.in> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile b/Makefile index 6471f20ca400..91baa282f3fa 100644 --- a/Makefile +++ b/Makefile @@ -814,7 +814,7 @@ KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) # Use --build-id when available. -LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ +LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ $(call cc-ldoption, -Wl$(comma)--build-id,)) KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) -- 2.8.1
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