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author | Paul Smith <psmith@gnu.org> | 2006-03-05 17:14:10 -0500 |
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committer | Sam Ravnborg <sam@mars.ravnborg.org> | 2006-03-06 00:09:51 +0100 |
commit | 4f1933620f57145212cdbb1ac6ce099eeeb21c5a (patch) | |
tree | c083cce1f0acedd92be2ac6eb5e6c49ebd84ac46 /scripts/Makefile.build | |
parent | 7b75b13cda8bd21e8636ea985f76e1ce5bd1a470 (diff) | |
download | kernel_goldelico_gta04-4f1933620f57145212cdbb1ac6ce099eeeb21c5a.zip kernel_goldelico_gta04-4f1933620f57145212cdbb1ac6ce099eeeb21c5a.tar.gz kernel_goldelico_gta04-4f1933620f57145212cdbb1ac6ce099eeeb21c5a.tar.bz2 |
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>
Diffstat (limited to 'scripts/Makefile.build')
-rw-r--r-- | scripts/Makefile.build | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 6ac96ea..7afe3e7 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -4,7 +4,7 @@ src := $(obj) -.PHONY: __build +PHONY := __build __build: # Read .config if it exist, otherwise ignore @@ -308,14 +308,14 @@ targets += $(multi-used-y) $(multi-used-m) # Descending # --------------------------------------------------------------------------- -.PHONY: $(subdir-ym) +PHONY += $(subdir-ym) $(subdir-ym): $(Q)$(MAKE) $(build)=$@ # Add FORCE to the prequisites of a target to force it to be always rebuilt. # --------------------------------------------------------------------------- -.PHONY: FORCE +PHONY += FORCE FORCE: @@ -330,3 +330,9 @@ cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),) include $(cmd_files) endif + + +# 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) |