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kbuild: make single target builds much faster
Since commit 394053f4a4
("kbuild: make single targets work more
correctly"), building single targets is really slow.
Speed it up by not descending into unrelated directories.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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parent
203126293c
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2dffd23f81
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@ -479,7 +479,10 @@ curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
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unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
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$(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
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__build: $(curdir-single) $(subdir-ym)
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single-subdirs := $(foreach d, $(subdir-ym), \
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$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
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__build: $(curdir-single) $(single-subdirs)
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ifneq ($(unknown-single),)
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$(Q)$(MAKE) -f /dev/null $(unknown-single)
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endif
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