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>
diff --git a/Makefile b/Makefile
index e90ee6a..45e5a38 100644
--- a/Makefile
+++ b/Makefile
@@ -491,6 +491,7 @@
# 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