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References: <20230723142128.194339-1-ojeda@kernel.org>
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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Tue, 25 Jul 2023 14:00:49 +0900
Message-ID: <CAK7LNAR_CaZ8fJ+fOm9-X83MOtwDa9aavZ5JM6DFOAA00GgULw@mail.gmail.com>
Subject: Re: [PATCH v2] kbuild: rust: avoid creating temporary files
To:     Miguel Ojeda <ojeda@kernel.org>
Cc:     Wedson Almeida Filho <wedsonaf@gmail.com>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nicolas Schier <nicolas@fjasle.eu>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>,
        Benno Lossin <benno.lossin@proton.me>,
        Alice Ryhl <aliceryhl@google.com>,
        Andreas Hindborg <a.hindborg@samsung.com>,
        linux-kbuild@vger.kernel.org, rust-for-linux@vger.kernel.org,
        linux-kernel@vger.kernel.org, patches@lists.linux.dev,
        Raphael Nestler <raphael.nestler@gmail.com>,
        Andrea Righi <andrea.righi@canonical.com>,
        stable@vger.kernel.org
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On Sun, Jul 23, 2023 at 11:21=E2=80=AFPM Miguel Ojeda <ojeda@kernel.org> wr=
ote:
>
> `rustc` outputs by default the temporary files (i.e. the ones saved
> by `-Csave-temps`, such as `*.rcgu*` files) in the current working
> directory when `-o` and `--out-dir` are not given (even if
> `--emit=3Dx=3Dpath` is given, i.e. it does not use those for temporaries)=
.
>
> Since out-of-tree modules are compiled from the `linux` tree,
> `rustc` then tries to create them there, which may not be accessible.
>
> Thus pass `--out-dir` explicitly, even if it is just for the temporary
> files.
>
> Similarly, do so for Rust host programs too.
>
> Reported-by: Raphael Nestler <raphael.nestler@gmail.com>
> Closes: https://github.com/Rust-for-Linux/linux/issues/1015
> Reported-by: Andrea Righi <andrea.righi@canonical.com>
> Tested-by: Raphael Nestler <raphael.nestler@gmail.com> # non-hostprogs
> Tested-by: Andrea Righi <andrea.righi@canonical.com> # non-hostprogs
> Fixes: 295d8398c67e ("kbuild: specify output names separately for each em=
ission type from rustc")
> Cc: stable@vger.kernel.org
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
> v2:
>   - Add fix for host programs too (Masahiro).


This is now available in the mainline.

df01b7cfcef08bf3fdcac2909d0e1910781d6bfd


--=20
Best Regards
Masahiro Yamada