linux-kernel - Re: [PATCH] gen_compile_commands: prune some directories

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Date:   Tue, 16 Feb 2021 15:40:51 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gen_compile_commands: prune some directories

On Fri, Feb 12, 2021 at 2:19 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> On Fri, Feb 12, 2021 at 01:11:54AM +0900, Masahiro Yamada wrote:
> > If directories are passed to gen_compile_commands.py, os.walk() traverses
> > all the subdirectories to search for .cmd files, but we know some of them
> > are not worth traversing.
> >
> > Use the 'topdown' parameter of os.walk to prune them.
> >
> > Documentation about the 'topdown' option of os.walk:
> >   When topdown is True, the caller can modify the dirnames list
> >   in-place (perhaps using del or slice assignment), and walk() will
> >   only recurse into the subdirectories whose names remain in dirnames;
> >   this can be used to prune the search, impose a specific order of
> >   visiting, or even to inform walk() about directories the caller
> >   creates or renames before it resumes walk() again. Modifying
> >   dirnames when topdown is False has no effect on the behavior of
> >   the walk, because in bottom-up mode the directories in dirnames
> >   are generated before dirpath itself is generated.
> >
> > This commit prunes four directories, .git, Documentation, include, and
> > tools.
> >
> > The first three do not contain any C files. My main motivation is the
> > last one, tools/ directory.
> >
> > Commit 6ca4c6d25949 ("gen_compile_commands: do not support .cmd files
> > under tools/ directory") stopped supporting the tools/ directory.
> > The current code no longer picks up .cmd files from the tools/
> > directory.
> >
> > If you run:
> >
> >   ./scripts/clang-tools/gen_compile_commands.py --log_level=INFO
> >
> > then, you will see several "File ... not found" log messages.
> >
> > This is expected, and I do not want to support the tools/ directory.
> > However, without an explicit comment "do not support tools/", somebody
> > might try to get it back. Clarify this.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>
> Sorry, I did not realize that gen_compile_commands.py did not intend to
> support. I was only looking at the history for the current location, not
> the former one of scripts/gen_compile_commands.py.
>
> Acked-by: Nathan Chancellor <nathan@...nel.org>
>

Applied to linux-kbuild.



Best Regards
Masahiro Yamada