Messages in this thread Patch in this message |  | | From | Rabin Vincent <> | Subject | [PATCH] Makefile: evaluate LDFLAGS_BUILD_ID only once | Date | Sun, 30 Apr 2017 18:16:00 +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:
$ make allnoconfig && make -j8 $ perf stat -r5 -e sched:sched_process_exec make -j8 - 2 119 sched:sched_process_exec + 1 878 sched:sched_process_exec
- 1,238817018 seconds time elapsed + 0,971020553 seconds time elapsed
Signed-off-by: Rabin Vincent <rabin@rab.in> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile b/Makefile index 779302695453..c78a266594c1 100644 --- a/Makefile +++ b/Makefile @@ -815,7 +815,7 @@ 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) -- 2.11.0
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