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authorRabin Vincent <rabin@rab.in>2017-04-30 18:16:00 +0200
committerMasahiro Yamada <yamada.masahiro@socionext.com>2017-05-03 13:43:24 +0900
commitbd74370b8657fc6fdab7b0d5024d011985183809 (patch)
treec56e46863c2140258cb93768fd19adbee3f68c8c /Makefile
parente8a3118e1f5cbe0c26704419390bf074689b349f (diff)
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>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 10d6cd348abb..35497e933995 100644
--- a/Makefile
+++ b/Makefile
@@ -829,7 +829,7 @@ 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)