From a0f97e06a43cf524e616f09e6af3398e1e9c1c5b Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@neptun.(none)>
Date: Sun, 14 Oct 2007 22:21:35 +0200
Subject: 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>
---
 arch/alpha/Makefile        | 2 +-
 arch/alpha/kernel/Makefile | 2 +-
 arch/alpha/lib/Makefile    | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

(limited to 'arch/alpha')

diff --git a/arch/alpha/Makefile b/arch/alpha/Makefile
index 1b704ee54bf3..2f283b2fb164 100644
--- a/arch/alpha/Makefile
+++ b/arch/alpha/Makefile
@@ -84,7 +84,7 @@ endif
 # For TSUNAMI, we must have the assembler not emulate our instructions.
 # The same is true for IRONGATE, POLARIS, PYXIS.
 # BWX is most important, but we don't really want any emulation ever.
-CFLAGS += $(cflags-y) -Wa,-mev6
+KBUILD_CFLAGS += $(cflags-y) -Wa,-mev6
 
 head-y := arch/alpha/kernel/head.o
 
diff --git a/arch/alpha/kernel/Makefile b/arch/alpha/kernel/Makefile
index ab6fa54b3860..dccf05245d4d 100644
--- a/arch/alpha/kernel/Makefile
+++ b/arch/alpha/kernel/Makefile
@@ -3,7 +3,7 @@
 #
 
 extra-y		:= head.o vmlinux.lds
-EXTRA_AFLAGS	:= $(CFLAGS)
+EXTRA_AFLAGS	:= $(KBUILD_CFLAGS)
 EXTRA_CFLAGS	:= -Werror -Wno-sign-compare
 
 obj-y    := entry.o traps.o process.o init_task.o osf_sys.o irq.o \
diff --git a/arch/alpha/lib/Makefile b/arch/alpha/lib/Makefile
index 266f78e13076..9b72c59c95be 100644
--- a/arch/alpha/lib/Makefile
+++ b/arch/alpha/lib/Makefile
@@ -2,7 +2,7 @@
 # Makefile for alpha-specific library files..
 #
 
-EXTRA_AFLAGS := $(CFLAGS)
+EXTRA_AFLAGS := $(KBUILD_CFLAGS)
 EXTRA_CFLAGS := -Werror
 
 # Many of these routines have implementations tuned for ev6.
-- 
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