linux-kernel - Re: [PATCH v9 23/27] Kbuild: add Rust support

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Message-ID: <CAK7LNASzund0a=t6gz3Mfex3j6jMfjYW--nqv9x_wY=RzSR-=g@mail.gmail.com>
Date:   Tue, 13 Sep 2022 15:37:23 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        patches@...ts.linux.dev, Jarkko Sakkinen <jarkko@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Finn Behrens <me@...enk.de>,
        Adam Bratschi-Kaye <ark.email@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sven Van Asbroeck <thesven73@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Boris-Chengbiao Zhou <bobo1239@....de>,
        Boqun Feng <boqun.feng@...il.com>,
        Douglas Su <d0u9.su@...look.com>,
        Dariusz Sosnowski <dsosnowski@...snowski.pl>,
        Antonio Terceiro <antonio.terceiro@...aro.org>,
        Daniel Xu <dxu@...uu.xyz>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v9 23/27] Kbuild: add Rust support

On Tue, Sep 13, 2022 at 1:18 AM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> Hi Masahiro,
>
> On Mon, Sep 12, 2022 at 5:08 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > I have not figured out where this difference comes from.
>
> It is the `RUSTC_BOOTSTRAP` environment variable: it allows to use
> unstable featuers in the stable compiler.


Thanks, I learned a new thing.


>
> We currently set it in the global `Makefile`, but we could be more
> explicit and do it on each command if you think that would be better.


I checked "make compile_commands.json", but it collects build commands
only for C.


I did not see any bad scenario with the current approach.








>
> If you want that we keep using the global export, then we can add a
> comment explaining this to clarify.
>
> Cheers,
> Miguel
--
Best Regards
Masahiro Yamada