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| Started by | Rabin Vincent <rabin@rab.in> |
|---|---|
| First post | 2017-04-30 18:20 +0200 |
| Last post | 2017-05-03 06:50 +0200 |
| Articles | 2 — 2 participants |
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[PATCH] Makefile: evaluate LDFLAGS_BUILD_ID only once Rabin Vincent <rabin@rab.in> - 2017-04-30 18:20 +0200
Re: [PATCH] Makefile: evaluate LDFLAGS_BUILD_ID only once Masahiro Yamada <yamada.masahiro@socionext.com> - 2017-05-03 06:50 +0200
| From | Rabin Vincent <rabin@rab.in> |
|---|---|
| Date | 2017-04-30 18:20 +0200 |
| Subject | [PATCH] Makefile: evaluate LDFLAGS_BUILD_ID only once |
| Message-ID | <tBZJL-5nM-7@gated-at.bofh.it> |
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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| From | Masahiro Yamada <yamada.masahiro@socionext.com> |
|---|---|
| Date | 2017-05-03 06:50 +0200 |
| Message-ID | <tCUoF-8jC-1@gated-at.bofh.it> |
| In reply to | #1633449 |
2017-05-01 1:16 GMT+09:00 Rabin Vincent <rabin@rab.in>: > 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> Applied to linux-kbuild/kbuild. Thanks! -- Best Regards Masahiro Yamada
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