tree 2503b24bdbc144aea9ea5bde6ead94b3406eaf98
parent 9a39e273d4df0560c724c5fe71f6314a0583ca2b
author Sam Ravnborg <sam@neptun.(none)> 1192393295 +0200
committer Sam Ravnborg <sam@neptun.(none)> 1192393295 +0200

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

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>