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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>
110 lines
3.2 KiB
Makefile
110 lines
3.2 KiB
Makefile
# Makefile for making bootable images on various OpenFirmware machines.
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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.
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#
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# Paul Mackerras January 1997
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# XCOFF bootable images for PowerMacs
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# Geert Uytterhoeven September 1997
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# ELF bootable iamges for CHRP machines.
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# Tom Rini January 2001
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# Cleaned up, moved into arch/ppc/boot/pmac
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# Tom Rini July/August 2002
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# Merged 'chrp' and 'pmac' into 'openfirmware', and cleaned up the
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# rules.
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zImage.initrd znetboot.initrd: del-ramdisk-sec := -R .ramdisk
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zImage.initrd znetboot.initrd: initrd := .initrd
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boot := arch/ppc/boot
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common := $(boot)/common
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utils := $(boot)/utils
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bootlib := $(boot)/lib
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of1275 := $(boot)/of1275
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images := $(boot)/images
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CHRP_LD_ARGS := -T $(srctree)/$(boot)/ld.script -e _start -Ttext 0x00800000
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COMMONOBJS := start.o misc.o common.o
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CHRPOBJS := crt0.o $(COMMONOBJS) chrpmain.o
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targets := $(CHRPOBJS) dummy.o
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CHRPOBJS := $(addprefix $(obj)/, $(CHRPOBJS))
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LIBS := lib/lib.a $(bootlib)/lib.a $(of1275)/lib.a $(common)/lib.a
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ifdef CONFIG_SMP
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END := .smp
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endif
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ifdef CONFIG_PPC64BRIDGE
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END += .64
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endif
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$(images)/ramdisk.image.gz:
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@echo ' MISSING $@'
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@echo ' RAM disk image must be provided separately'
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@/bin/false
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quiet_cmd_genimage = GEN $@
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cmd_genimage = $(OBJCOPY) -R .comment \
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--add-section=.image=$(images)/vmlinux.gz \
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--set-section-flags=.image=contents,alloc,load,readonly,data $< $@
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targets += image.o
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$(obj)/image.o: $(obj)/dummy.o $(images)/vmlinux.gz FORCE
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$(call if_changed,genimage)
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# Place the ramdisk in the initrd image.
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quiet_cmd_genimage-initrd = GEN $@
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cmd_genimage-initrd = $(OBJCOPY) $< $@ \
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--add-section=.ramdisk=$(images)/ramdisk.image.gz \
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--set-section-flags=.ramdisk=contents,alloc,load,readonly,data
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targets += image.initrd.o
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$(obj)/image.initrd.o: $(obj)/image.o $(images)/ramdisk.image.gz FORCE
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$(call if_changed,genimage-initrd)
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targets += crt0.o
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$(obj)/crt0.o: $(common)/crt0.S FORCE
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$(call if_changed_dep,as_o_S)
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quiet_cmd_gen-chrp = CHRP $@
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cmd_gen-chrp = $(LD) $(CHRP_LD_ARGS) -o $@ $(CHRPOBJS) $< $(LIBS) && \
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$(OBJCOPY) $@ $@ -R .comment $(del-ramdisk-sec)
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$(images)/zImage.chrp: $(obj)/image.o $(CHRPOBJS) $(LIBS) \
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$(srctree)/$(boot)/ld.script
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$(call cmd,gen-chrp)
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$(images)/zImage.initrd.chrp: $(obj)/image.initrd.o $(CHRPOBJS) $(LIBS) \
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$(srctree)/$(boot)/ld.script
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$(call cmd,gen-chrp)
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quiet_cmd_addnote = ADDNOTE $@
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cmd_addnote = cat $< > $@ && $(utils)/addnote $@
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$(images)/zImage.chrp-rs6k $(images)/zImage.initrd.chrp-rs6k: \
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%-rs6k: %
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$(call cmd,addnote)
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# The targets used on the make command-line
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PHONY += zImage zImage.initrd
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zImage: $(images)/zImage.chrp \
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$(images)/zImage.chrp-rs6k
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@echo ' kernel: $@ is ready ($<)'
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zImage.initrd: $(images)/zImage.initrd.chrp \
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$(images)/zImage.initrd.chrp-rs6k
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@echo ' kernel: $@ is ready ($<)'
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TFTPIMAGE := /tftpboot/zImage
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PHONY += znetboot znetboot.initrd
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znetboot: $(images)/zImage.chrp
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cp $(images)/zImage.chrp $(TFTPIMAGE).chrp$(END)
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@echo ' kernel: $@ is ready ($<)'
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znetboot.initrd:$(images)/zImage.initrd.chrp
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cp $(images)/zImage.initrd.chrp $(TFTPIMAGE).chrp$(END)
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@echo ' kernel: $@ is ready ($<)'
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