Commit 1c9e70a5 authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Michal Marek

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.
Signed-off-by: default avatarMasahiro Yamada <>
Acked-by: default avatarSam Ravnborg <>
Signed-off-by: default avatarMichal Marek <>
parent a03fcb50
......@@ -120,9 +120,10 @@ ifneq ($(KBUILD_OUTPUT),)
# Invoke a second make in the output directory, passing relevant variables
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
&& /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
$(error output directory "$(saved-output)" does not exist))
$(error failed to create output directory "$(saved-output)"))
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