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authorSam Ravnborg <sam@ravnborg.org>2005-04-30 16:51:42 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-30 16:51:42 -0700
commite8e6993178344eb348f60f05b16d9dc30db3b9cf (patch)
treeddb7d643d247c1f7650245794433b7c1eec92331 /Makefile
parentb3d9ae4b98f6d28481d4d4b768d860a2cfb5805d (diff)
[PATCH] kbuild: Set NOSTDINC_FLAGS late to speed up compile (a little)
Move definition of NOSTDINC_FLAGS below inclusion of arch Makefile, so any arch specific settings to $(CC) takes effect before looking up the compiler include directory. The previous solution that replaced ':=' with '=' caused gcc to be invoked one additional time for each directory visited. This decreases kernel compile time with 0.1 second (3.6 -> 3.5 seconds) when running make on a fully built kernel Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile6
1 files changed, 4 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 8da3a306d0c0..48990899db0d 100644
--- a/Makefile
+++ b/Makefile
@@ -332,9 +332,7 @@ KALLSYMS = scripts/kallsyms
PERL = perl
CHECK = sparse
-NOSTDINC_FLAGS = -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
-CHECKFLAGS += $(NOSTDINC_FLAGS)
MODFLAGS = -DMODULE
CFLAGS_MODULE = $(MODFLAGS)
AFLAGS_MODULE = $(MODFLAGS)
@@ -531,6 +529,10 @@ endif
include $(srctree)/arch/$(ARCH)/Makefile
+# arch Makefile may override CC so keep this after arch Makefile is included
+NOSTDINC_FLAGS := -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+CHECKFLAGS += $(NOSTDINC_FLAGS)
+
# warn about C99 declaration after statement
CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)

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