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kbuild: enable 'make CFLAGS=...' to add additional options to CC

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The variable CFLAGS is a wellknown variable and the usage by
kbuild may result in unexpected behaviour.
On top of that several people over time has asked for a way to
pass in additional flags to gcc.

This patch replace use of CFLAGS with KBUILD_CFLAGS all over the
tree and enabling one to use:
make CFLAGS=...
to specify additional gcc commandline options.

One usecase is when trying to find gcc bugs but other
use cases has been requested too.

Patch was tested on following architectures:
alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k

Test was simple to do a defconfig build, apply the patch and check
that nothing got rebuild.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Sam Ravnborg
2007-10-14 22:21:35 +02:00
parent 9a39e273d4
commit a0f97e06a4
46 changed files with 137 additions and 136 deletions
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2
arch/um/Makefile-os-Linux
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@@ -5,4 +5,4 @@
# To get a definition of F_SETSIG
USER_CFLAGS += -D_GNU_SOURCE -D_LARGEFILE64_SOURCE
CFLAGS += -D_LARGEFILE64_SOURCE
KBUILD_CFLAGS += -D_LARGEFILE64_SOURCE