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@xxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
