From a0f97e06a43cf524e616f09e6af3398e1e9c1c5b Mon Sep 17 00:00:00 2001 From: Sam Ravnborg 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 --- arch/powerpc/Makefile | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) (limited to 'arch/powerpc/Makefile') diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 643839a3f5d8..51309848c11d 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -77,8 +77,8 @@ CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=none -mcall-aixdesc CFLAGS-$(CONFIG_PPC32) := -Iarch/$(ARCH) -ffixed-r2 -mmultiple CPPFLAGS += $(CPPFLAGS-y) AFLAGS += $(AFLAGS-y) -CFLAGS += -msoft-float -pipe $(CFLAGS-y) -CPP = $(CC) -E $(CFLAGS) +KBUILD_CFLAGS += -msoft-float -pipe $(CFLAGS-y) +CPP = $(CC) -E $(KBUILD_CFLAGS) CHECKFLAGS += -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__ @@ -88,35 +88,35 @@ GCC_BROKEN_VEC := $(shell if [ $(call cc-version) -lt 0400 ] ; then echo "y"; fi ifeq ($(CONFIG_POWER4_ONLY),y) ifeq ($(CONFIG_ALTIVEC),y) ifeq ($(GCC_BROKEN_VEC),y) - CFLAGS += $(call cc-option,-mcpu=970) + KBUILD_CFLAGS += $(call cc-option,-mcpu=970) else - CFLAGS += $(call cc-option,-mcpu=power4) + KBUILD_CFLAGS += $(call cc-option,-mcpu=power4) endif else - CFLAGS += $(call cc-option,-mcpu=power4) + KBUILD_CFLAGS += $(call cc-option,-mcpu=power4) endif else - CFLAGS += $(call cc-option,-mtune=power4) + KBUILD_CFLAGS += $(call cc-option,-mtune=power4) endif endif ifeq ($(CONFIG_TUNE_CELL),y) - CFLAGS += $(call cc-option,-mtune=cell) + KBUILD_CFLAGS += $(call cc-option,-mtune=cell) endif # No AltiVec instruction when building kernel -CFLAGS += $(call cc-option,-mno-altivec) +KBUILD_CFLAGS += $(call cc-option,-mno-altivec) # Enable unit-at-a-time mode when possible. It shrinks the # kernel considerably. -CFLAGS += $(call cc-option,-funit-at-a-time) +KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) # Never use string load/store instructions as they are # often slow when they are implemented at all -CFLAGS += -mno-string +KBUILD_CFLAGS += -mno-string ifeq ($(CONFIG_6xx),y) -CFLAGS += -mcpu=powerpc +KBUILD_CFLAGS += -mcpu=powerpc endif cpu-as-$(CONFIG_4xx) += -Wa,-m405 @@ -126,7 +126,7 @@ cpu-as-$(CONFIG_E500) += -Wa,-me500 cpu-as-$(CONFIG_E200) += -Wa,-me200 AFLAGS += $(cpu-as-y) -CFLAGS += $(cpu-as-y) +KBUILD_CFLAGS += $(cpu-as-y) head-y := arch/powerpc/kernel/head_$(CONFIG_WORD_SIZE).o head-$(CONFIG_8xx) := arch/powerpc/kernel/head_8xx.o -- cgit v1.2.3