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: Masahiro Yamada <[email protected]> Acked-by: Sam Ravnborg <[email protected]> Signed-off-by: Michal Marek <[email protected]>
jimmycarry · Mar 31, 2014 · 1c9e70a · 1c9e70a
1 parent a03fcb5
commit 1c9e70a
Showing 1 changed file with 3 additions and 2 deletions.
diff --git 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