linux-kernel - Re: [PATCH v2] kbuild: rust: avoid creating temporary files

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Message-ID: <01d23a2c-1e30-b660-7997-6d9c29b9dcf1@gmail.com>
Date:   Sun, 23 Jul 2023 11:34:54 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        linux-kbuild@...r.kernel.org, rust-for-linux@...r.kernel.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Raphael Nestler <raphael.nestler@...il.com>,
        Andrea Righi <andrea.righi@...onical.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] kbuild: rust: avoid creating temporary files

On 7/23/23 11:21, Miguel Ojeda wrote:
> `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=x=path` 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@...il.com>
> Closes: https://github.com/Rust-for-Linux/linux/issues/1015
> Reported-by: Andrea Righi <andrea.righi@...onical.com>
> Tested-by: Raphael Nestler <raphael.nestler@...il.com> # non-hostprogs
> Tested-by: Andrea Righi <andrea.righi@...onical.com> # non-hostprogs
> Fixes: 295d8398c67e ("kbuild: specify output names separately for each emission type from rustc")
> Cc: stable@...r.kernel.org
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
> ---
> [...]
Tested-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>