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kbuild: make single target builds much faster

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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>
This commit is contained in:
Masahiro Yamada 2019-10-16 14:15:47 +09:00
parent 203126293c
commit 2dffd23f81
1 changed files with 4 additions and 1 deletions
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5
scripts/Makefile.build
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@ -479,7 +479,10 @@ curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
$(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
__build: $(curdir-single) $(subdir-ym)
single-subdirs := $(foreach d, $(subdir-ym), \
$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
__build: $(curdir-single) $(single-subdirs)
ifneq ($(unknown-single),)
$(Q)$(MAKE) -f /dev/null $(unknown-single)
endif