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

[Martin Rodriguez Reboredo <yakoyoku@gmail.com>]

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@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 emission type from rustc")
> Cc: stable@vger.kernel.org
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
> [...]
Tested-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>