kbuild: enable 'make CPPFLAGS=...' to add additional options to CPP

The variable CPPFLAGS is a wellknown variable and the usage by
kbuild may result in unexpected behaviour.

This patch replace use of CPPFLAGS with KBUILD_CPPFLAGS all over the
tree and enabling one to use:
make CPPFLAGS=...
to specify additional CPP commandline options.

Patch was tested on following architectures:
alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k, s390

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index b762d235b81..0d450e757e0 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -32,11 +32,11 @@ KBUILD_CFLAGS	+=-fno-omit-frame-pointer -mapcs -mno-sched-prolog
 endif
 
 ifeq ($(CONFIG_CPU_BIG_ENDIAN),y)
-CPPFLAGS        += -mbig-endian
+KBUILD_CPPFLAGS += -mbig-endian
 AS              += -EB
 LD              += -EB
 else
-CPPFLAGS        += -mlittle-endian
+KBUILD_CPPFLAGS += -mlittle-endian
 AS              += -EL
 LD              += -EL
 endif