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kbuild: change kbuild to not rely on incorrect GNU make behavior

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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 <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
This commit is contained in:
Paul Smith 2006-03-05 17:14:10 -05:00 • committed by Sam Ravnborg
commit 4f1933620f
25 changed files with 144 additions and 75 deletions
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7
arch/arm26/Makefile
View file

@ -1,6 +1,9 @@
#
# arch/arm26/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.
@ -49,9 +52,9 @@ all: zImage
boot := arch/arm26/boot
.PHONY: maketools FORCE
PHONY += maketools FORCE
maketools: FORCE
# Convert bzImage to zImage
bzImage: vmlinux

5
arch/arm26/boot/Makefile
View file

@ -1,6 +1,9 @@
#
# 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.
@ -60,7 +63,7 @@ $(obj)/xipImage: vmlinux FORCE
@echo ' Kernel: $@ is ready'
endif
.PHONY: initrd
PHONY += initrd
initrd:
@test "$(INITRD_PHYS)" != "" || \
(echo This machine does not support INITRD; exit -1)