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>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 760567a9ba16..f3d0d7c70977 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -63,7 +63,7 @@ cflags-$(CONFIG_PA8X00)		+= -march=2.0 -mschedule=8000
 
 head-y                  := arch/parisc/kernel/head.o 
 
-CFLAGS  += $(cflags-y)
+KBUILD_CFLAGS   += $(cflags-y)
 
 kernel-y                        := mm/ kernel/ math-emu/ kernel/init_task.o
 kernel-$(CONFIG_HPUX)           += hpux/