4f1933620f
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>
149 lines
4.8 KiB
Makefile
149 lines
4.8 KiB
Makefile
# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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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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# Changes for PPC by Gary Thomas
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# Rewritten by Cort Dougan and Paul Mackerras
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#
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# This must match PAGE_OFFSET in include/asm-ppc/page.h.
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KERNELLOAD := $(CONFIG_KERNEL_START)
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HAS_BIARCH := $(call cc-option-yn, -m32)
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ifeq ($(HAS_BIARCH),y)
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AS := $(AS) -a32
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LD := $(LD) -m elf32ppc
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CC := $(CC) -m32
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endif
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LDFLAGS_vmlinux := -Ttext $(KERNELLOAD) -Bstatic
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# The -Iarch/$(ARCH)/include is temporary while we are merging
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CPPFLAGS += -Iarch/$(ARCH) -Iarch/$(ARCH)/include
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AFLAGS += -Iarch/$(ARCH)
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CFLAGS += -Iarch/$(ARCH) -msoft-float -pipe \
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-ffixed-r2 -mmultiple
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# No AltiVec instruction when building kernel
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CFLAGS += $(call cc-option, -mno-altivec)
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CPP = $(CC) -E $(CFLAGS)
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# Temporary hack until we have migrated to asm-powerpc
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LINUXINCLUDE += -Iarch/$(ARCH)/include
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CHECKFLAGS += -D__powerpc__
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ifndef CONFIG_FSL_BOOKE
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CFLAGS += -mstring
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endif
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cpu-as-$(CONFIG_PPC64BRIDGE) += -Wa,-mppc64bridge
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cpu-as-$(CONFIG_4xx) += -Wa,-m405
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cpu-as-$(CONFIG_6xx) += -Wa,-maltivec
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cpu-as-$(CONFIG_POWER4) += -Wa,-maltivec
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cpu-as-$(CONFIG_E500) += -Wa,-me500
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cpu-as-$(CONFIG_E200) += -Wa,-me200
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AFLAGS += $(cpu-as-y)
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CFLAGS += $(cpu-as-y)
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# Default to the common case.
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KBUILD_DEFCONFIG := common_defconfig
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head-y := arch/ppc/kernel/head.o
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head-$(CONFIG_8xx) := arch/ppc/kernel/head_8xx.o
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head-$(CONFIG_4xx) := arch/ppc/kernel/head_4xx.o
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head-$(CONFIG_44x) := arch/ppc/kernel/head_44x.o
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head-$(CONFIG_FSL_BOOKE) := arch/ppc/kernel/head_fsl_booke.o
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head-$(CONFIG_6xx) += arch/ppc/kernel/idle_6xx.o
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head-$(CONFIG_POWER4) += arch/ppc/kernel/idle_power4.o
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head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
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core-y += arch/ppc/kernel/ arch/powerpc/kernel/ \
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arch/ppc/platforms/ \
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arch/ppc/mm/ arch/ppc/lib/ \
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arch/ppc/syslib/ arch/powerpc/sysdev/ \
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arch/powerpc/lib/
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core-$(CONFIG_4xx) += arch/ppc/platforms/4xx/
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core-$(CONFIG_83xx) += arch/ppc/platforms/83xx/
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core-$(CONFIG_85xx) += arch/ppc/platforms/85xx/
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core-$(CONFIG_MATH_EMULATION) += arch/ppc/math-emu/
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core-$(CONFIG_XMON) += arch/ppc/xmon/
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core-$(CONFIG_APUS) += arch/ppc/amiga/
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drivers-$(CONFIG_8xx) += arch/ppc/8xx_io/
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drivers-$(CONFIG_4xx) += arch/ppc/4xx_io/
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drivers-$(CONFIG_CPM2) += arch/ppc/8260_io/
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drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/
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BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm
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PHONY += $(BOOT_TARGETS)
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all: uImage zImage
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CPPFLAGS_vmlinux.lds := -Upowerpc
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# All the instructions talk about "make bzImage".
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bzImage: zImage
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boot := arch/$(ARCH)/boot
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$(BOOT_TARGETS): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $@
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uImage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot)/images $(boot)/images/$@
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define archhelp
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@echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/images/zImage.*)'
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@echo ' uImage - Create a bootable image for U-Boot / PPCBoot'
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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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@echo ' *_defconfig - Select default config from arch/$(ARCH)/ppc/configs'
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endef
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archclean:
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$(Q)$(MAKE) $(clean)=arch/ppc/boot
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# Temporary hack until we have migrated to asm-powerpc
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$(Q)rm -rf arch/$(ARCH)/include
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archprepare: checkbin
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# Temporary hack until we have migrated to asm-powerpc
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include/asm: arch/$(ARCH)/include/asm
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arch/$(ARCH)/include/asm:
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$(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi
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$(Q)ln -fsn $(srctree)/include/asm-powerpc arch/$(ARCH)/include/asm
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# Use the file '.tmp_gas_check' for binutils tests, as gas won't output
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# to stdout and these checks are run even on install targets.
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TOUT := .tmp_gas_check
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# Ensure this is binutils 2.12.1 (or 2.12.90.0.7) or later for altivec
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# instructions.
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# gcc-3.4 and binutils-2.14 are a fatal combination.
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checkbin:
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@if test "$(call cc-version)" = "0304" ; then \
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if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
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echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
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echo 'correctly with gcc-3.4 and your version of binutils.'; \
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echo '*** Please upgrade your binutils or downgrade your gcc'; \
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false; \
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fi ; \
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fi
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@if ! /bin/echo dssall | $(AS) -many -o $(TOUT) >/dev/null 2>&1 ; then \
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echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build ' ; \
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echo 'correctly with old versions of binutils.' ; \
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echo '*** Please upgrade your binutils to 2.12.1 or newer' ; \
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false ; \
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fi
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CLEAN_FILES += $(TOUT)
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