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>
diff --git a/arch/avr32/Makefile b/arch/avr32/Makefile
index dc6bc01..9883c8b 100644
--- a/arch/avr32/Makefile
+++ b/arch/avr32/Makefile
@@ -11,14 +11,14 @@
KBUILD_DEFCONFIG := atstk1002_defconfig
-CFLAGS += -pipe -fno-builtin -mno-pic
+KBUILD_CFLAGS += -pipe -fno-builtin -mno-pic
AFLAGS += -mrelax -mno-pic
CFLAGS_MODULE += -mno-relax
LDFLAGS_vmlinux += --relax
cpuflags-$(CONFIG_CPU_AT32AP7000) += -mcpu=ap7000
-CFLAGS += $(cpuflags-y)
+KBUILD_CFLAGS += $(cpuflags-y)
AFLAGS += $(cpuflags-y)
CHECKFLAGS += -D__avr32__ -D__BIG_ENDIAN