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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 <psmith@gnu.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Paul Smith
2006-03-05 17:14:10 -05:00
committed by Sam Ravnborg
parent 7b75b13cda
commit 4f1933620f
25 changed files with 144 additions and 75 deletions
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10
scripts/Makefile.modinst
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@ -2,7 +2,7 @@
# Installing modules
# ==========================================================================
.PHONY: __modinst
PHONY := __modinst
__modinst:
include scripts/Kbuild.include
@ -12,7 +12,7 @@ include scripts/Kbuild.include
__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
.PHONY: $(modules)
PHONY += $(modules)
__modinst: $(modules)
@:
@ -27,3 +27,9 @@ modinst_dir = $(if $(KBUILD_EXTMOD),$(ext-mod-dir),kernel/$(@D))
$(modules):
$(call cmd,modules_install,$(MODLIB)/$(modinst_dir))
# Declare the contents of the .PHONY variable as phony. We keep that
# information in a variable se we can use it in if_changed and friends.
.PHONY: $(PHONY)