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authorMasahiro Yamada <yamada.masahiro@socionext.com>2017-11-13 19:29:34 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2017-11-16 09:07:32 +0900
commit9a234a2e384349f21afac8d718aa294a668ad4fa (patch)
tree43d0b8a9ca7c6aa953a0bf849e457813e3892108 /scripts/Makefile.modpost
parent859fd5860cd1bbbd0370ba4f20725999681b66c8 (diff)
downloadlinux-9a234a2e384349f21afac8d718aa294a668ad4fa.tar.bz2
kbuild: create directory for make cache only when necessary
Currently, the existence of $(dir $(make-cache)) is always checked, and created if it is missing. We can avoid unnecessary system calls by some tricks. [1] If KBUILD_SRC is unset, we are building in the source tree. The output directory checks can be entirely skipped. [2] If at least one cache data is found, it means the cache file was included. Obviously its directory exists. Skip "mkdir -p". [3] If Makefile does not contain any call of __run-and-store, it will not create a cache file. No need to create its directory. [4] The "mkdir -p" should be only invoked by the first call of __run-and-store Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Douglas Anderson <dianders@chromium.org>
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