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/x86/boot/Makefile | 4 ++-- arch/x86/boot/compressed/Makefile_32 | 2 +- arch/x86/boot/compressed/Makefile_64 | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-) (limited to 'arch/x86/boot') diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile index cb1035f2b7e..646292aaf1f 100644 --- a/arch/x86/boot/Makefile +++ b/arch/x86/boot/Makefile @@ -50,7 +50,7 @@ HOSTCFLAGS_build.o := $(LINUXINCLUDE) # that way we can complain to the user if the CPU is insufficient. cflags-i386 := cflags-x86_64 := -m32 -CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ +KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ $(cflags-$(ARCH)) \ -Wall -Wstrict-prototypes \ -march=i386 -mregparm=3 \ @@ -61,7 +61,7 @@ CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ $(call cc-option, -fno-unit-at-a-time)) \ $(call cc-option, -fno-stack-protector) \ $(call cc-option, -mpreferred-stack-boundary=2) -AFLAGS := $(CFLAGS) -D__ASSEMBLY__ +AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ $(obj)/zImage: IMAGE_OFFSET := 0x1000 $(obj)/zImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) diff --git a/arch/x86/boot/compressed/Makefile_32 b/arch/x86/boot/compressed/Makefile_32 index 22613c652d2..e43ff7c56e6 100644 --- a/arch/x86/boot/compressed/Makefile_32 +++ b/arch/x86/boot/compressed/Makefile_32 @@ -11,7 +11,7 @@ EXTRA_AFLAGS := -traditional LDFLAGS_vmlinux := -T hostprogs-y := relocs -CFLAGS := -m32 -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ +KBUILD_CFLAGS := -m32 -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ -fno-strict-aliasing -fPIC \ $(call cc-option,-ffreestanding) \ $(call cc-option,-fno-stack-protector) diff --git a/arch/x86/boot/compressed/Makefile_64 b/arch/x86/boot/compressed/Makefile_64 index dc6b3380cc4..3013ad01fe6 100644 --- a/arch/x86/boot/compressed/Makefile_64 +++ b/arch/x86/boot/compressed/Makefile_64 @@ -6,11 +6,11 @@ targets := vmlinux vmlinux.bin vmlinux.bin.gz head_64.o misc_64.o piggy.o -CFLAGS := -m64 -D__KERNEL__ $(LINUXINCLUDE) -O2 \ +KBUILD_CFLAGS := -m64 -D__KERNEL__ $(LINUXINCLUDE) -O2 \ -fno-strict-aliasing -fPIC -mcmodel=small \ $(call cc-option, -ffreestanding) \ $(call cc-option, -fno-stack-protector) -AFLAGS := $(CFLAGS) -D__ASSEMBLY__ +AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ LDFLAGS := -m elf_x86_64 LDFLAGS_vmlinux := -T -- cgit v1.2.3-70-g09d2