kbuild: enable 'make CFLAGS=...' to add additional options to CC

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86_64 / Makefile

#
# x86_64/Makefile
#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies. Remember to do have actions
# for "archclean" and "archdep" for cleaning up and making dependencies for
# this architecture
#
# This file is subject to the terms and conditions of the GNU General Public
# License.  See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1994 by Linus Torvalds
#
# 19990713  Artur Skawina <skawina@geocities.com>
#           Added '-march' and '-mpreferred-stack-boundary' support
# 20000913  Pavel Machek <pavel@suse.cz>
#	    Converted for x86_64 architecture
# 20010105  Andi Kleen, add IA32 compiler.
#           ....and later removed it again....
#
# $Id: Makefile,v 1.31 2002/03/22 15:56:07 ak Exp $

# Fill in SRCARCH
SRCARCH	:= x86

LDFLAGS		:= -m elf_x86_64
OBJCOPYFLAGS	:= -O binary -R .note -R .comment -S
LDFLAGS_vmlinux :=
CHECKFLAGS      += -D__x86_64__ -m64

cflags-y	:=
cflags-kernel-y	:=
cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
# gcc doesn't support -march=core2 yet as of gcc 4.3, but I hope it
# will eventually. Use -mtune=generic as fallback
cflags-$(CONFIG_MCORE2) += \
	$(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)

cflags-y += -m64
cflags-y += -mno-red-zone
cflags-y += -mcmodel=kernel
cflags-y += -pipe
cflags-y += -Wno-sign-compare
cflags-y += -fno-asynchronous-unwind-tables
ifneq ($(CONFIG_DEBUG_INFO),y)
# -fweb shrinks the kernel a bit, but the difference is very small
# it also messes up debugging, so don't use it for now.
#cflags-y += $(call cc-option,-fweb)
endif
# -funit-at-a-time shrinks the kernel .text considerably
# unfortunately it makes reading oopses harder.
cflags-y += $(call cc-option,-funit-at-a-time)
# prevent gcc from generating any FP code by mistake
cflags-y += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
# this works around some issues with generating unwind tables in older gccs
# newer gccs do it by default
cflags-y += -maccumulate-outgoing-args

# do binutils support CFI?
cflags-y += $(call as-instr,.cfi_startproc\n.cfi_rel_offset rsp${comma}0\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_rel_offset rsp${comma}0\n.cfi_endproc,-DCONFIG_AS_CFI=1,)

# is .cfi_signal_frame supported too?
cflags-y += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)

cflags-$(CONFIG_CC_STACKPROTECTOR) += $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh "$(CC)" -fstack-protector )
cflags-$(CONFIG_CC_STACKPROTECTOR_ALL) += $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh "$(CC)" -fstack-protector-all )

KBUILD_CFLAGS += $(cflags-y)
CFLAGS_KERNEL += $(cflags-kernel-y)
AFLAGS += -m64

head-y := arch/x86/kernel/head_64.o arch/x86/kernel/head64.o arch/x86/kernel/init_task_64.o

libs-y 					+= arch/x86/lib/
core-y					+= arch/x86/kernel/ \
					   arch/x86/mm/ \
					   arch/x86/crypto/ \
					   arch/x86/vdso/
core-$(CONFIG_IA32_EMULATION)		+= arch/x86/ia32/
drivers-$(CONFIG_PCI)			+= arch/x86/pci/
drivers-$(CONFIG_OPROFILE)		+= arch/x86/oprofile/

boot := arch/x86/boot

PHONY += bzImage bzlilo install archmrproper \
	 fdimage fdimage144 fdimage288 isoimage archclean

#Default target when executing "make"
all: bzImage

BOOTIMAGE                     := arch/x86/boot/bzImage
KBUILD_IMAGE                  := $(BOOTIMAGE)

bzImage: vmlinux
	$(Q)mkdir -p $(objtree)/arch/x86_64/boot
	$(Q)ln -fsn $(objtree)/arch/x86/boot/bzImage $(objtree)/arch/x86_64/boot/bzImage
	$(Q)$(MAKE) $(build)=$(boot) $(BOOTIMAGE)

bzlilo: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) zlilo

bzdisk: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) zdisk

fdimage fdimage144 fdimage288 isoimage: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@

install:
	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@ 

archclean:
	$(Q)rm -rf $(objtree)/arch/x86_64/boot
	$(Q)$(MAKE) $(clean)=$(boot)

define archhelp
  echo  '* bzImage	- Compressed kernel image (arch/$(ARCH)/boot/bzImage)'
  echo  '  install	- Install kernel using'
  echo  '		   (your) ~/bin/installkernel or'
  echo  '		   (distribution) /sbin/installkernel or'
  echo  '		   install to $$(INSTALL_PATH) and run lilo'
  echo  '  bzdisk       - Create a boot floppy in /dev/fd0'
  echo  '  fdimage      - Create a boot floppy image'
  echo  '  isoimage     - Create a boot CD-ROM image'
endef

CLEAN_FILES += arch/$(ARCH)/boot/fdimage \
	       arch/$(ARCH)/boot/image.iso \
	       arch/$(ARCH)/boot/mtools.conf