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    Subject[PATCH] x86: unify x86 Makefile(s)
    Unify the 32 and 64 bit specific Makefiles.
    The unification was simplest to do in one step although the
    readability of the patch suffers a bit from this.

    Noteworthy remarks on the unification:
    - The 64 bit cpu stuff should be moved to Makefile_32.cpu
    but I did not feel confident doing it due to subtle differences
    - The use of cflags-y were abandoned since we have seen one bug where
    we did wrong due to missing assignment to KBUILD_CFLAGS
    - The "No need to remake" line are deleted. It caused "make -B" to fail
    - For 64 bit the sub architecture stuff is not used but structure
    is kept to make it easy to introduce.
    - The way head64.o is specified could be nicer - but it awaits the
    introduction of head32.o (which seems like a win to introduce for readability)
    - -funit-at-a-time should be easy to unify but it looks like we have a bug
    in 32 bit. We only enable -funit-at-a-time for gcc less than 0400 if they
    support it (and I recall it is a gcc 4.00 feature). [-lt -> -gt]
    Introduced by 9ab34fe76114b9538bfcaf3a9d112dee0feb5f17 "enable unit-at-a-time
    optimisations for gcc4"
    - Patch is checkpatch clean

    Patch is tested by doing a defconfig build for i386 and x86_64 and in both
    cases monitoring that only relevant files were recompiled when applying
    the patch.

    Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
    ---
    Additional unifications are possible I think apart from the cpu stuff.
    But I do not know enough about the gcc options to judge what happens
    if we introduce the currently 64 bit specific options in the 32 bit build.
    (-m64 is obviously not a candidate).

    Sam

    arch/x86/Makefile | 243 +++++++++++++++++++++++++++++++++++++++++++++++++-
    arch/x86/Makefile_32 | 181 -------------------------------------
    arch/x86/Makefile_64 | 141 -----------------------------
    3 files changed, 239 insertions(+), 326 deletions(-)

    diff --git a/arch/x86/Makefile b/arch/x86/Makefile
    index 7aa1dc6..b0ab9e7 100644
    --- a/arch/x86/Makefile
    +++ b/arch/x86/Makefile
    @@ -7,13 +7,248 @@ else
    KBUILD_DEFCONFIG := $(ARCH)_defconfig
    endif

    -# No need to remake these files
    -$(srctree)/arch/x86/Makefile%: ;
    +# BITS is used as extension for files which are available in a 32 bit
    +# and a 64 bit version to simplify shared Makefiles.
    +# e.g.: obj-y += foo_$(BITS).o
    +export BITS

    ifeq ($(CONFIG_X86_32),y)
    + BITS := 32
    UTS_MACHINE := i386
    - include $(srctree)/arch/x86/Makefile_32
    +
    + HAS_BIARCH := $(call cc-option-yn, -m32)
    + ifeq ($(HAS_BIARCH),y)
    + AS := $(AS) --32
    + LD := $(LD) -m elf_i386
    + CC := $(CC) -m32
    + endif
    +
    + ifdef CONFIG_RELOCATABLE
    + LDFLAGS_vmlinux := --emit-relocs
    + endif
    + CHECKFLAGS += -D__i386__
    + KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
    else
    + BITS := 64
    UTS_MACHINE := x86_64
    - include $(srctree)/arch/x86/Makefile_64
    + CHECKFLAGS += -D__x86_64__ -m64
    endif
    +
    +LDFLAGS := -m elf_$(UTS_MACHINE)
    +OBJCOPYFLAGS := -O binary -R .note -R .comment -S
    +KBUILD_CFLAGS += -pipe
    +
    +
    +ifeq ($(CONFIG_X86_32),y)
    + # prevent gcc from keeping the stack 16 byte aligned
    + KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
    +
    + # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
    + # a lot more stack due to the lack of sharing of stacklots:
    + KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
    + echo $(call cc-option,-fno-unit-at-a-time); fi ;)
    +
    + # CPU-specific tuning. Anything which can be shared with UML should go here.
    + include $(srctree)/arch/x86/Makefile_32.cpu
    + KBUILD_CFLAGS += $(cflags-y)
    +
    + # temporary until string.h is fixed
    + KBUILD_CFLAGS += -ffreestanding
    +
    +else
    + KBUILD_AFLAGS += -m64
    + KBUILD_CFLAGS += -m64
    + # FIXME - should be integrated in Makefile.cpu
    + cflags-$(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)
    + KBUILD_CFLAGS += $(cflags-y)
    +
    + KBUILD_CFLAGS += -mno-red-zone
    + KBUILD_CFLAGS += -mcmodel=kernel
    +
    + KBUILD_CFLAGS += -Wno-sign-compare
    + KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
    + ifneq ($(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.
    + #KBUILD_CFLAGS += $(call cc-option,-fweb)
    + endif
    + # -funit-at-a-time shrinks the kernel .text considerably
    + # unfortunately it makes reading oopses harder.
    + KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
    +
    + # prevent gcc from generating any FP code by mistake
    + KBUILD_CFLAGS += $(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
    + KBUILD_CFLAGS += -maccumulate-outgoing-args
    +
    + stackp := $(CONFIG_SHELL) $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh
    + stackp-$(CONFIG_CC_STACKPROTECTOR) := $(shell $(stackp) \
    + "$(CC)" -fstack-protector )
    + stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += $(shell $(stackp) \
    + "$(CC)" -fstack-protector-all )
    +
    + KBUILD_CFLAGS += $(stackp-y)
    +endif
    +
    +
    +
    +# Stackpointer is addressed different for 32 bit and 64 bit x86
    +sp-$(CONFIG_X86_32) := esp
    +sp-$(CONFIG_X86_64) := rsp
    +
    +# do binutils support CFI?
    +cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
    +# is .cfi_signal_frame supported too?
    +cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
    +KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
    +KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
    +
    +
    +###
    +# Sub architecture support
    +
    +# Default subarch .c files
    +mcore-y := arch/x86/mach-default
    +
    +# Voyager subarch support
    +mflags-$(CONFIG_X86_VOYAGER) := -Iinclude/asm-x86/mach-voyager
    +mcore-$(CONFIG_X86_VOYAGER) := arch/x86/mach-voyager
    +
    +# VISWS subarch support
    +mflags-$(CONFIG_X86_VISWS) := -Iinclude/asm-x86/mach-visws
    +mcore-$(CONFIG_X86_VISWS) := arch/x86/mach-visws
    +
    +# NUMAQ subarch support
    +mflags-$(CONFIG_X86_NUMAQ) := -Iinclude/asm-x86/mach-numaq
    +mcore-$(CONFIG_X86_NUMAQ) := arch/x86/mach-default
    +
    +# BIGSMP subarch support
    +mflags-$(CONFIG_X86_BIGSMP) := -Iinclude/asm-x86/mach-bigsmp
    +mcore-$(CONFIG_X86_BIGSMP) := arch/x86/mach-default
    +
    +# RDC R-321x subarch support
    +mflags-$(CONFIG_X86_RDC321X) := -Iinclude/asm-x86/mach-rdc321x
    +mcore-$(CONFIG_X86_RDC321X) := arch/x86/mach-default
    +core-$(CONFIG_X86_RDC321X) += arch/x86/mach-rdc321x/
    +
    +#Summit subarch support
    +mflags-$(CONFIG_X86_SUMMIT) := -Iinclude/asm-x86/mach-summit
    +mcore-$(CONFIG_X86_SUMMIT) := arch/x86/mach-default
    +
    +# generic subarchitecture
    +mflags-$(CONFIG_X86_GENERICARCH) := -Iinclude/asm-x86/mach-generic
    +mcore-$(CONFIG_X86_GENERICARCH) := arch/x86/mach-default
    +core-$(CONFIG_X86_GENERICARCH) += arch/x86/mach-generic/
    +
    +# ES7000 subarch support
    +mflags-$(CONFIG_X86_ES7000) := -Iinclude/asm-x86/mach-es7000
    +mcore-$(CONFIG_X86_ES7000) := arch/x86/mach-default
    +core-$(CONFIG_X86_ES7000) := arch/x86/mach-es7000/
    +
    +# default subarch .h files
    +mflags-y += -Iinclude/asm-x86/mach-default
    +
    +# 64 bit does not use subarch support - clear relevant variables
    +core-$(CONFIG_X86_64) :=
    +mcore-$(CONFIG_X86_64) :=
    +mflags-$(CONFIG_X86_64) :=
    +
    +KBUILD_CFLAGS += $(mflags-y)
    +KBUILD_AFLAGS += $(mflags-y)
    +
    +
    +###
    +# Kernel objects
    +
    +head-y := arch/x86/kernel/head_$(BITS).o
    +head-$(CONFIG_X86_64) += arch/x86/kernel/head64.o
    +head-y += arch/x86/kernel/init_task.o
    +
    +libs-y += arch/x86/lib/
    +
    +# Xen paravirtualization support
    +core-$(CONFIG_XEN) += arch/x86/xen/
    +
    +# lguest paravirtualization support
    +core-$(CONFIG_LGUEST_GUEST) += arch/x86/lguest/
    +
    +core-y += arch/x86/kernel/
    +core-y += arch/x86/mm/
    +core-y += $(mcore-y)/
    +core-y += arch/x86/crypto/
    +core-y += arch/x86/vdso/
    +core-$(CONFIG_IA32_EMULATION) += arch/x86/ia32/
    +
    +# drivers-y are linked after core-y
    +drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
    +drivers-$(CONFIG_PCI) += arch/x86/pci/
    +
    +# must be linked after kernel/
    +drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
    +
    +ifeq ($(CONFIG_X86_32),y)
    +drivers-$(CONFIG_PM) += arch/x86/power/
    +drivers-$(CONFIG_FB) += arch/x86/video/
    +endif
    +
    +boot := arch/x86/boot
    +
    +PHONY += zImage bzImage compressed zlilo bzlilo \
    + zdisk bzdisk fdimage fdimage144 fdimage288 isoimage install
    +
    +# Default kernel to build
    +all: bzImage
    +
    +# KBUILD_IMAGE specify target image being built
    + KBUILD_IMAGE := $(boot)/bzImage
    +zImage zlilo zdisk: KBUILD_IMAGE := arch/x86/boot/zImage
    +
    +zImage bzImage: vmlinux
    + $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
    + $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
    + $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/bzImage
    +
    +compressed: zImage
    +
    +zlilo bzlilo: vmlinux
    + $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zlilo
    +
    +zdisk bzdisk: vmlinux
    + $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zdisk
    +
    +fdimage fdimage144 fdimage288 isoimage: vmlinux
    + $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) $@
    +
    +install: vdso_install
    + $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) install
    +
    +PHONY += vdso_install
    +vdso_install:
    + $(Q)$(MAKE) $(build)=arch/x86/vdso $@
    +
    +archclean:
    + $(Q)rm -rf $(objtree)/arch/i386
    + $(Q)rm -rf $(objtree)/arch/x86_64
    + $(Q)$(MAKE) $(clean)=$(boot)
    +
    +define archhelp
    + echo '* bzImage - Compressed kernel image (arch/x86/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/x86/boot/fdimage \
    + arch/x86/boot/image.iso \
    + arch/x86/boot/mtools.conf
    diff --git a/arch/x86/Makefile_32 b/arch/x86/Makefile_32
    deleted file mode 100644
    index 293eda3..0000000
    --- a/arch/x86/Makefile_32
    +++ /dev/null
    @@ -1,181 +0,0 @@
    -#
    -# i386 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" cleaning up 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
    -#
    -# 20050320 Kianusch Sayah Karadji <kianusch@sk-tech.net>
    -# Added support for GEODE CPU
    -
    -# BITS is used as extension for files which are available in a 32 bit
    -# and a 64 bit version to simplify shared Makefiles.
    -# e.g.: obj-y += foo_$(BITS).o
    -BITS := 32
    -export BITS
    -
    -HAS_BIARCH := $(call cc-option-yn, -m32)
    -ifeq ($(HAS_BIARCH),y)
    -AS := $(AS) --32
    -LD := $(LD) -m elf_i386
    -CC := $(CC) -m32
    -endif
    -
    -LDFLAGS := -m elf_i386
    -OBJCOPYFLAGS := -O binary -R .note -R .comment -S
    -ifdef CONFIG_RELOCATABLE
    -LDFLAGS_vmlinux := --emit-relocs
    -endif
    -CHECKFLAGS += -D__i386__
    -
    -KBUILD_CFLAGS += -pipe -msoft-float -mregparm=3 -freg-struct-return
    -
    -# prevent gcc from keeping the stack 16 byte aligned
    -KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
    -
    -# CPU-specific tuning. Anything which can be shared with UML should go here.
    -include $(srctree)/arch/x86/Makefile_32.cpu
    -
    -# temporary until string.h is fixed
    -cflags-y += -ffreestanding
    -
    -# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
    -# a lot more stack due to the lack of sharing of stacklots:
    -KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then echo $(call cc-option,-fno-unit-at-a-time); fi ;)
    -
    -# do binutils support CFI?
    -cflags-y += $(call as-instr,.cfi_startproc\n.cfi_rel_offset esp${comma}0\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
    -KBUILD_AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_rel_offset esp${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,)
    -KBUILD_AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
    -
    -KBUILD_CFLAGS += $(cflags-y)
    -
    -# Default subarch .c files
    -mcore-y := arch/x86/mach-default
    -
    -# Voyager subarch support
    -mflags-$(CONFIG_X86_VOYAGER) := -Iinclude/asm-x86/mach-voyager
    -mcore-$(CONFIG_X86_VOYAGER) := arch/x86/mach-voyager
    -
    -# VISWS subarch support
    -mflags-$(CONFIG_X86_VISWS) := -Iinclude/asm-x86/mach-visws
    -mcore-$(CONFIG_X86_VISWS) := arch/x86/mach-visws
    -
    -# NUMAQ subarch support
    -mflags-$(CONFIG_X86_NUMAQ) := -Iinclude/asm-x86/mach-numaq
    -mcore-$(CONFIG_X86_NUMAQ) := arch/x86/mach-default
    -
    -# BIGSMP subarch support
    -mflags-$(CONFIG_X86_BIGSMP) := -Iinclude/asm-x86/mach-bigsmp
    -mcore-$(CONFIG_X86_BIGSMP) := arch/x86/mach-default
    -
    -# RDC R-321x subarch support
    -mflags-$(CONFIG_X86_RDC321X) := -Iinclude/asm-x86/mach-rdc321x
    -mcore-$(CONFIG_X86_RDC321X) := arch/x86/mach-default
    -core-$(CONFIG_X86_RDC321X) += arch/x86/mach-rdc321x/
    -
    -#Summit subarch support
    -mflags-$(CONFIG_X86_SUMMIT) := -Iinclude/asm-x86/mach-summit
    -mcore-$(CONFIG_X86_SUMMIT) := arch/x86/mach-default
    -
    -# generic subarchitecture
    -mflags-$(CONFIG_X86_GENERICARCH) := -Iinclude/asm-x86/mach-generic
    -mcore-$(CONFIG_X86_GENERICARCH) := arch/x86/mach-default
    -core-$(CONFIG_X86_GENERICARCH) += arch/x86/mach-generic/
    -
    -# ES7000 subarch support
    -mflags-$(CONFIG_X86_ES7000) := -Iinclude/asm-x86/mach-es7000
    -mcore-$(CONFIG_X86_ES7000) := arch/x86/mach-default
    -core-$(CONFIG_X86_ES7000) := arch/x86/mach-es7000/
    -
    -# Xen paravirtualization support
    -core-$(CONFIG_XEN) += arch/x86/xen/
    -
    -# lguest paravirtualization support
    -core-$(CONFIG_LGUEST_GUEST) += arch/x86/lguest/
    -
    -# default subarch .h files
    -mflags-y += -Iinclude/asm-x86/mach-default
    -
    -head-y := arch/x86/kernel/head_32.o arch/x86/kernel/init_task.o
    -
    -libs-y += arch/x86/lib/
    -core-y += arch/x86/kernel/ \
    - arch/x86/mm/ \
    - $(mcore-y)/ \
    - arch/x86/crypto/ \
    - arch/x86/vdso/
    -drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
    -drivers-$(CONFIG_PCI) += arch/x86/pci/
    -# must be linked after kernel/
    -drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
    -drivers-$(CONFIG_PM) += arch/x86/power/
    -drivers-$(CONFIG_FB) += arch/x86/video/
    -
    -KBUILD_CFLAGS += $(mflags-y)
    -KBUILD_AFLAGS += $(mflags-y)
    -
    -boot := arch/x86/boot
    -
    -PHONY += zImage bzImage compressed zlilo bzlilo \
    - zdisk bzdisk fdimage fdimage144 fdimage288 isoimage install
    -
    -all: bzImage
    -
    -# KBUILD_IMAGE specify target image being built
    - KBUILD_IMAGE := $(boot)/bzImage
    -zImage zlilo zdisk: KBUILD_IMAGE := arch/x86/boot/zImage
    -
    -zImage bzImage: vmlinux
    - $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
    - $(Q)mkdir -p $(objtree)/arch/i386/boot
    - $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/i386/boot/bzImage
    -
    -compressed: zImage
    -
    -zlilo bzlilo: vmlinux
    - $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zlilo
    -
    -zdisk bzdisk: vmlinux
    - $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zdisk
    -
    -fdimage fdimage144 fdimage288 isoimage: vmlinux
    - $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) $@
    -
    -install: vdso_install
    - $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) install
    -
    -PHONY += vdso_install
    -vdso_install:
    - $(Q)$(MAKE) $(build)=arch/x86/vdso $@
    -
    -archclean:
    - $(Q)rm -rf $(objtree)/arch/i386/boot
    - $(Q)$(MAKE) $(clean)=arch/x86/boot
    -
    -define archhelp
    - echo '* bzImage - Compressed kernel image (arch/x86/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/x86/boot/fdimage \
    - arch/x86/boot/image.iso \
    - arch/x86/boot/mtools.conf
    diff --git a/arch/x86/Makefile_64 b/arch/x86/Makefile_64
    deleted file mode 100644
    index d12bb14..0000000
    --- a/arch/x86/Makefile_64
    +++ /dev/null
    @@ -1,141 +0,0 @@
    -#
    -# 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 $
    -
    -# BITS is used as extension for files which are available in a 32 bit
    -# and a 64 bit version to simplify shared Makefiles.
    -# e.g.: obj-y += foo_$(BITS).o
    -BITS := 64
    -export BITS
    -
    -LDFLAGS := -m elf_x86_64
    -OBJCOPYFLAGS := -O binary -R .note -R .comment -S
    -LDFLAGS_vmlinux :=
    -CHECKFLAGS += -D__x86_64__ -m64
    -
    -cflags-y :=
    -cflags-kernel-y :=
    -cflags-$(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,)
    -KBUILD_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,)
    -KBUILD_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 += $(cflags-kernel-y)
    -KBUILD_AFLAGS += -m64
    -
    -head-y := arch/x86/kernel/head_64.o arch/x86/kernel/head64.o arch/x86/kernel/init_task.o
    -
    -libs-y += arch/x86/lib/
    -core-y += arch/x86/kernel/ \
    - arch/x86/mm/ \
    - arch/x86/crypto/ \
    - arch/x86/vdso/
    -core-$(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
    - $(Q)$(MAKE) $(build)=$(boot) $(BOOTIMAGE)
    - $(Q)mkdir -p $(objtree)/arch/x86_64/boot
    - $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/x86_64/boot/bzImage
    -
    -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: vdso_install
    - $(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@
    -
    -vdso_install:
    - $(Q)$(MAKE) $(build)=arch/x86/vdso $@
    -
    -archclean:
    - $(Q)rm -rf $(objtree)/arch/x86_64/boot
    - $(Q)$(MAKE) $(clean)=$(boot)
    -
    -define archhelp
    - echo '* bzImage - Compressed kernel image (arch/x86/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/x86/boot/fdimage \
    - arch/x86/boot/image.iso \
    - arch/x86/boot/mtools.conf
    -
    -

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      Last update: 2007-12-28 22:27    [W:0.055 / U:29.692 seconds]
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