Masahiro Yamada c4da7ed0e7 kbuild: optimize object directory creation for incremental build
The previous commit largely optimized the object directory creation.
We can optimize it more for incremental build.

There are already *.cmd files in the output directory.  The existing
*.cmd files have been picked up by $(wildcard ...).  Obviously,
directories containing them exist too, so we can skip "mkdir -p".

With this, Kbuild runs almost zero "mkdir -p" in incremental building.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-11-16 09:07:36 +09:00
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