kbuild: create a build directory automatically for out-of-tree build
Kbuild supports saving output files in a separate directory. But the build directory must be created beforehand. For example, $ mkdir -p dir/to/store/output/files $ make O=dir/to/store/output/files defconfig Creating a build directory automatically would be useful. [ imported from Linux Kernel, commit 1c9e70a55b08 ] Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Michal Marek <mmarek@suse.cz> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Makefile
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Makefile
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@ -112,9 +112,10 @@ ifneq ($(KBUILD_OUTPUT),)
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# Invoke a second make in the output directory, passing relevant variables
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# check that the output directory actually exists
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saved-output := $(KBUILD_OUTPUT)
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KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
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KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
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&& /bin/pwd)
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$(if $(KBUILD_OUTPUT),, \
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$(error output directory "$(saved-output)" does not exist))
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$(error failed to create output directory "$(saved-output)"))
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PHONY += $(MAKECMDGOALS)
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