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Commit e8e69931 authored by Sam Ravnborg's avatar Sam Ravnborg Committed by Linus Torvalds
Browse files

[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: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b3d9ae4b

Makefile

+4 −2
Original line number Diff line number Diff line
@@ -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,)