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Commit c4da7ed0 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

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: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
parent 8a78756e

scripts/Makefile.build

+5 −0
Original line number Diff line number Diff line
@@ -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.