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The kbuild system takes advantage of an incorrect behavior in GNU make. Once this behavior is fixed, all files in the kernel rebuild every time, even if nothing has changed. This patch ensures kbuild works with both the incorrect and correct behaviors of GNU make. For more details on the incorrect behavior, see: http://lists.gnu.org/archive/html/bug-make/2006-03/msg00003.html Changes in this patch: - Keep all targets that are to be marked .PHONY in a variable, PHONY. - Add .PHONY: $(PHONY) to mark them properly. - Remove any $(PHONY) files from the $? list when determining whether targets are up-to-date or not. Signed-off-by: Paul Smith <psmith@gnu.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
108 lines
3.3 KiB
Makefile
108 lines
3.3 KiB
Makefile
#
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# x86_64/Makefile
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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#
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# 19990713 Artur Skawina <skawina@geocities.com>
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# Added '-march' and '-mpreferred-stack-boundary' support
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# 20000913 Pavel Machek <pavel@suse.cz>
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# Converted for x86_64 architecture
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# 20010105 Andi Kleen, add IA32 compiler.
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# ....and later removed it again....
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#
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# $Id: Makefile,v 1.31 2002/03/22 15:56:07 ak Exp $
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LDFLAGS := -m elf_x86_64
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OBJCOPYFLAGS := -O binary -R .note -R .comment -S
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LDFLAGS_vmlinux :=
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CHECKFLAGS += -D__x86_64__ -m64
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cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
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cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
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CFLAGS += $(cflags-y)
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CFLAGS += -m64
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CFLAGS += -mno-red-zone
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CFLAGS += -mcmodel=kernel
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CFLAGS += -pipe
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# this makes reading assembly source easier, but produces worse code
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# actually it makes the kernel smaller too.
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CFLAGS += -fno-reorder-blocks
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CFLAGS += -Wno-sign-compare
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ifneq ($(CONFIG_UNWIND_INFO),y)
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CFLAGS += -fno-asynchronous-unwind-tables
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endif
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ifneq ($(CONFIG_DEBUG_INFO),y)
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# -fweb shrinks the kernel a bit, but the difference is very small
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# it also messes up debugging, so don't use it for now.
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#CFLAGS += $(call cc-option,-fweb)
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endif
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# -funit-at-a-time shrinks the kernel .text considerably
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# unfortunately it makes reading oopses harder.
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CFLAGS += $(call cc-option,-funit-at-a-time)
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# prevent gcc from generating any FP code by mistake
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CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
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AFLAGS += -m64
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head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kernel/init_task.o
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libs-y += arch/x86_64/lib/
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core-y += arch/x86_64/kernel/ \
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arch/x86_64/mm/ \
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arch/x86_64/crypto/
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core-$(CONFIG_IA32_EMULATION) += arch/x86_64/ia32/
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drivers-$(CONFIG_PCI) += arch/x86_64/pci/
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drivers-$(CONFIG_OPROFILE) += arch/x86_64/oprofile/
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boot := arch/x86_64/boot
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PHONY += bzImage bzlilo install archmrproper \
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fdimage fdimage144 fdimage288 archclean
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#Default target when executing "make"
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all: bzImage
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BOOTIMAGE := arch/x86_64/boot/bzImage
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KBUILD_IMAGE := $(BOOTIMAGE)
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bzImage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(BOOTIMAGE)
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bzlilo: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) zlilo
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bzdisk: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) zdisk
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fdimage fdimage144 fdimage288: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@
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install:
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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define archhelp
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echo '* bzImage - Compressed kernel image (arch/$(ARCH)/boot/bzImage)'
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echo ' install - Install kernel using'
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echo ' (your) ~/bin/installkernel or'
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echo ' (distribution) /sbin/installkernel or'
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echo ' install to $$(INSTALL_PATH) and run lilo'
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endef
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CLEAN_FILES += arch/$(ARCH)/boot/fdimage arch/$(ARCH)/boot/mtools.conf
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