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Paul Smith 4f1933620f kbuild: change kbuild to not rely on incorrect GNU make behavior

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>

2006-03-06 00:09:51 +01:00

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arch/arm26/boot/Makefile

This file is included by the global makefile so that you can add your own

architecture-specific flags and dependencies.

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) 1995-2002 Russell King

Note: the following conditions must always be true:

ZRELADDR == virt_to_phys(TEXTADDR)

PARAMS_PHYS must be with 4MB of ZRELADDR

INITRD_PHYS must be in RAM

zreladdr-y := 0x02080000 params_phys-y := 0x0207c000 initrd_phys-y := 0x02180000

ZRELADDR := 0x02080000 ZTEXTADDR := 0x0207c000 PARAMS_PHYS := $(params_phys-y) INITRD_PHYS := 0x02180000

We now have a PIC decompressor implementation. Decompressors running

from RAM should not define ZTEXTADDR. Decompressors running directly

from ROM or Flash must define ZTEXTADDR (preferably via the config)

FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK

ifeq ($(CONFIG_ZBOOT_ROM),y) ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT) ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS) else ZTEXTADDR := 0 ZBSSADDR := ALIGN(4) endif

export ZTEXTADDR ZBSSADDR ZRELADDR INITRD_PHYS PARAMS_PHYS

targets := Image zImage bootpImage xipImage

$(obj)/Image: vmlinux FORCE $(call if_changed,objcopy) @echo ' Kernel: $@ is ready'

$(obj)/zImage: $(obj)/compressed/vmlinux FORCE $(call if_changed,objcopy) @echo ' Kernel: $@ is ready'

$(obj)/compressed/vmlinux: vmlinux FORCE $(Q)$(MAKE) $(build)=$(obj)/compressed $@

ifeq ($(CONFIG_XIP_KERNEL),y) $(obj)/xipImage: vmlinux FORCE

$(OBJCOPY) -S -O binary -R .data -R .comment vmlinux vmlinux-text.bin

FIXME - where has .pci_fixup crept in from?

$(OBJCOPY) -S -O binary -R .data -R .pci_fixup -R .comment vmlinux vmlinux-text.bin
$(OBJCOPY) -S -O binary -R .init -R .text -R __ex_table -R .pci_fixup -R __ksymtab -R __ksymtab_gpl -R __kcrctab -R __kcrctab_gpl -R __param -R .comment vmlinux vmlinux-data.bin
cat vmlinux-text.bin vmlinux-data.bin > $@
$(RM) -f vmlinux-text.bin vmlinux-data.bin
@echo '  Kernel: $@ is ready'

endif

PHONY += initrd initrd: @test "$(INITRD_PHYS)" != "" ||
(echo This machine does not support INITRD; exit -1) @test "$(INITRD)" != "" ||
(echo You must specify INITRD; exit -1)

install: $(obj)/Image $(CONFIG_SHELL) $(obj)/install.sh
$(KERNELRELEASE)
$(obj)/Image System.map "$(INSTALL_PATH)"

zinstall: $(obj)/zImage $(CONFIG_SHELL) $(obj)/install.sh
$(KERNELRELEASE)
$(obj)/zImage System.map "$(INSTALL_PATH)"

subdir- := compressed

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