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Makefile: evaluate LDFLAGS_BUILD_ID only once
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> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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Makefile
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Makefile
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@ -829,7 +829,7 @@ KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
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KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
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# Use --build-id when available.
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LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
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LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
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$(call cc-ldoption, -Wl$(comma)--build-id,))
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KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
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LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
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