linux-kernel - Re: [PATCH v2] kbuild: gitignore output directory

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Message-Id: <20190322155212.133029-1-andre.przywara@arm.com>
Date:   Fri, 22 Mar 2019 15:52:12 +0000
From:   Andre Przywara <andre.przywara@....com>
To:     Vladimir Kondratiev <vladimir.kondratiev@...ux.intel.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] kbuild: gitignore output directory

Hi,

> 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

just found this when testing -rc1.
Unfortunately this breaks my setup, because I keep a totally separate
git repository in my build directories to track (various versions of)
.config. So .gitignore there is carefully crafted to ignore most build
artefacts, but not .config, for instance.

I am not sure how git would interact with the build directory for you?
Do you build into a subdirectory of the kernel tree?

I was hoping that we would not overwrite unrelated files in directories
outside of the kernel tree. In case this is about a subdirectory of the
source tree, can we somehow check for this case?

Cheers,
Andre.

> 
> Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@...ux.intel.com>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>  Makefile | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Makefile b/Makefile
> index 97ee0be24d52..d487fca342c4 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
>  outputmakefile:
>  ifneq ($(KBUILD_SRC),)
>  	$(Q)ln -fsn $(srctree) source
>  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
> +	$(Q){ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
>  endif
>  
>  ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
> -- 
> 2.17.1