kbuild: do not overwrite .gitignore in output directory

Backported from kernel
commit 156e7cbb3ef5 ("kbuild: do not overwrite .gitignore in output directory")

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

diff --git a/Makefile b/Makefile
index f05c700..5dad1aa 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -519,7 +519,8 @@ outputmakefile:
 ifneq ($(KBUILD_SRC),)
        $(Q)ln -fsn $(srctree) source
        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
-       $(Q){ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
+       $(Q)test -e .gitignore || \
+               { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 endif
 
 # To make sure we do not include .config for any of the *config targets