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kbuild: add real-prereqs shorthand for $(filter-out FORCE,$^)

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In Kbuild, if_changed and friends must have FORCE as a prerequisite.

Hence, $(filter-out FORCE,$^) or $(filter-out $(PHONY),$^) is a common
idiom to get the names of all the prerequisites except phony targets.

Add real-prereqs as a shorthand.

Note:
We cannot replace $(filter %.o,$^) in cmd_link_multi-m because $^ may
include auto-generated dependencies from the .*.cmd file when a single
object module is changed into a multi object module. Refer to commit
69ea912fda ("kbuild: remove unneeded link_multi_deps"). I added some
comment to avoid accidental breakage.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Masahiro Yamada
2019-01-17 19:02:43 +09:00
parent 5d680056cb
commit afa974b771
9 changed files with 25 additions and 19 deletions
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4
scripts/Kbuild.include
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@@ -23,6 +23,10 @@ depfile = $(subst $(comma),_,$(dot-target).d)
# filename of target with directory and extension stripped
basetarget = $(basename $(notdir $@))
###
# real prerequisites without phony targets
real-prereqs = $(filter-out $(PHONY), $^)
###
# Escape single quote for use in echo statements
escsq = $(subst $(squote),'\$(squote)',$1)