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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-13 19:29:38 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-16 09:07:36 +0900 |
| commit | c4da7ed0e7d715b159b11efd10408510ffed1aa3 (patch) | |
| tree | a08d8a1e2fcb39de48dd815d0bf30996b8bbb2f7 | |
| parent | 8a78756eb545a6fb8007fa154a626ca2bc208027 (diff) | |
| download | linux-c4da7ed0e7d715b159b11efd10408510ffed1aa3.tar.bz2 | |
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 $(wildcard ...). Obviously,
directories containing them exist too, so we can skip "mkdir -p".
With this, Kbuild runs almost zero "mkdir -p" in incremental building.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
| -rw-r--r-- | scripts/Makefile.build | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 496ecd825c71..8624924a2991 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -583,8 +583,13 @@ endif ifneq ($(KBUILD_SRC),) # Create directories for object files if they do not exist obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) +# If cmd_files exist, their directories apparently exist. Skip mkdir. +exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files)))) +obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs))) +ifneq ($(obj-dirs),) $(shell mkdir -p $(obj-dirs)) endif +endif # Declare the contents of the .PHONY variable as phony. We keep that # information in a variable se we can use it in if_changed and friends. |