kbuild: fix silentoldconfig with make O=



Al Viro reported that sometimes silentoldconfig failed because
output directory was missing.
So create it unconditionally before executing conf

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

parent 5bb78269

Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -491,6 +491,7 @@ include .config
		# If .config is newer than include/linux/autoconf.h, someone tinkered
		# with it and forgot to run make oldconfig
		include/linux/autoconf.h: .config
		$(Q)mkdir -p include/linux
		$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
		else
		# Dummy target needed, because used as prerequisite