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| author | Sam Ravnborg <sam@ravnborg.org> | 2005-04-30 16:51:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-30 16:51:42 -0700 |
| commit | e8e6993178344eb348f60f05b16d9dc30db3b9cf (patch) | |
| tree | ddb7d643d247c1f7650245794433b7c1eec92331 /Makefile | |
| parent | b3d9ae4b98f6d28481d4d4b768d860a2cfb5805d (diff) | |
| download | lwn-e8e6993178344eb348f60f05b16d9dc30db3b9cf.tar.gz lwn-e8e6993178344eb348f60f05b16d9dc30db3b9cf.zip | |
[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-- | Makefile | 6 |
1 files changed, 4 insertions, 2 deletions
@@ -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,) |