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Subject[PATCH] kbuild: create a build directory automatically for out-of-tree build
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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: Masahiro Yamada <yamada.m@jp.panasonic.com>
---
Makefile | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 575e1f8..35b5b7e 100644
--- a/Makefile
+++ b/Makefile
@@ -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)"))

PHONY += $(MAKECMDGOALS) sub-make

--
1.8.3.2


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