Re: [PATCH v2 06/11] kbuild: rust_is_available: check that environment variables are set

[Martin Rodriguez Reboredo]

On 6/15/23 21:16, Miguel Ojeda wrote:
> Sometimes [1] users may attempt to setup the Rust support by
> checking what Kbuild does and they end up finding out about
> `scripts/rust_is_available.sh`. Inevitably, they run the script
> directly, but unless they setup the required variables,
> the result of the script is not meaningful.
>
> We could add some defaults to the variables, but that could be
> confusing for those that may override the defaults (compared
> to their kernel builds), and `$CC` would not be a simple default
> in any case.
>
> Therefore, instead, explicitly check whether the expected variables
> are set (`$RUSTC`, `$BINDGEN` and `$CC`). If not, print an explanation
> about the fact that the script is meant to be called from Kbuild,
> since that is the most likely cause for the variables not being set.
>
> Link: https://lore.kernel.org/oe-kbuild-all/Y6r4mXz5NS0+HVXo@xxxxxxx/ [1]
> Signed-off-by: Miguel Ojeda <ojeda@xxxxxxxxxx>
> ---
> [...]

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@xxxxxxxxx>