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Message-ID: <DCHFGJXCAPAZ.3JG065Y5DZVLZ@google.com>
Date: Mon, 01 Sep 2025 11:29:44 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Nicolas Schier <nsc@...nel.org>, Nathan Chancellor <nathan@...nel.org>
Cc: Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Bill Wendling <morbo@...gle.com>,
<linux-kernel@...r.kernel.org>, Justin Stitt <justinstitt@...gle.com>,
<llvm@...ts.linux.dev>, <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH] .gitignore: ignore temporary files from 'bear'
On Sat Aug 30, 2025 at 7:25 PM UTC, Nicolas Schier wrote:
> On Fri, Aug 29, 2025 at 04:38:24PM -0700, Nathan Chancellor wrote:
>> Hi Brendan,
>>
>> On Wed, Aug 27, 2025 at 08:59:43AM +0000, Brendan Jackman wrote:
>> > Bear [0] is a tool for generating compile_commands.json. For Kbuild,
>> > Bear is not useful, since Kbuild already generates the necessary info
>> > and that can be converted to compile_commands.json by
>> > gen_compile_commads.py.
>> >
>> > However, for code in tools/, it's handy. For example, this command
>> > updates compile_commands.json so that clangd code navigation will also
>> > work for the VMA unit tests:
>> >
>> > bear --append -- make -C tools/testing/vma -j
>> >
>> > Bear generates some temporary files. These are usually deleted again
>> > but having them show up ephemerally confuses tools that trigger
>> > recompilation on source code changes. Ignore them in Git so that these
>> > tools can tell they aren't source code.
>> >
>> > [0]: https://github.com/rizsotto/Bear
>> >
>> > Signed-off-by: Brendan Jackman <jackmanb@...gle.com>
>>
>> We can likely take this via the Kbuild tree. I do wonder if this would
>> be better in a tools/.gitignore file since bear is really only of use
>> there but I am not sure it matters much.
>
> yeah, please consider using tools/.gitignore.
I don't believe that works here, because AFAIK clangd assumes a single
compile_commands.json, so while we could git-ignore
tools/compile_commands.json that wouldn't really serve the usecase I
have here with 'bear --append'.
> Please have a look at
> this thread about ignoring files from "external" tools:
>
> https://lore.kernel.org/lkml/CAHk-=wiJHMje8cpiTajqrLrM23wZK0SWetuK1Bd67c0OGM_BzQ@mail.gmail.com/
Hm, I would read the spirit of that thread as not being about things
from 'external tools', rather Linus' objection seems to be that the
_lifetime_ of the mbox files is unrelated to the kernel build. Well, to
be honest the only coherent principle I can get from it is "don't break
Linus' workflow". Which... yeah, is still a pretty valid concern.
> If using tools/.gitignore is not possible, I think the best way for
> ignoring files that are not natively related to kernel build tools is to
> update the local ~/.config/git/ignore, as suggested in
>
> https://lore.kernel.org/lkml/CAK7LNAQas0cK7pgi72tYC3yU=ZkQxnr41YYW1mXd-sWiHtG+UA@mail.gmail.com/
Given this alternative, and given the fact that I'm ignoring a very
generic suffix in *.tmp (if it was just *.events.json I'd say the
practical risk has gotta be close to nil), I think we could just drop
this unless anyone else pops up with evidence that 'bear' is important
to lots of people or something.
Cheers,
Brendan
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