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Subject[PATCH v2] kbuild: gitignore output directory
From: Vladimir Kondratiev <>

When compiling into output directory using O=, many files
created under KBUILD_OUTPUT that git considers
as new ones; git clients, ex. "git gui" lists it, and it clutters
file list making it difficult to see what was really changed

Generate .gitignore in output directory that ignores all
its content

Signed-off-by: Vladimir Kondratiev <>
Makefile | 3 +++
1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index 141653226f3c..b1d651e822b1 100644
--- a/Makefile
+++ b/Makefile
@@ -483,10 +483,13 @@ PHONY += outputmakefile
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
+# At the same time when output Makefile generated, generate .gitignore to
+# ignore whole output directory
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

ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
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