[bug#69637] [PATCH mesa-updates 0/6] gnu: mesa: Update to 24.0.2.

[aurtzy]

On 3/12/24 04:11, Efraim Flashner wrote:

> Are there other architectures which have rust based drivers? x86_64
> isn't the only architecture which has rust building on it.
>     
    There doesn't appear to be any official documentation stating
    architecture requirements for Mesa with NVK/Rust, however I have
    added few new inputs other than rust to get NVK working. I've only
    done extensive testing with x86_64 so I was unsure of potential
    issues with including this on other architectures (other than i686
    not building rust).
> The crates are also available in
> %output/share/cargo/registry/name-version.crate, although I can't think
> of a good way to address them by name without using find-files.
>
> I would personally replace the versions requested by mesa with whatever
> version we happen to have in guix so that we don't have to add special
> versions just for mesa.
>

I have/had tried a few approaches to use the crates already available in Guix with no success so far. I've outlined the approaches below; still looking into solutions, but perhaps there's something I'm missing or haven't tried yet?

- Simply including crates as (native-)inputs does not make them discoverable by meson.

- Mesa uses these *.wrap files which specify the rust dependency versions, source URLs, and tar hashes. I currently get the build working by relying on meson to fall back to "downloading" from a patched source URL (pointing to store), although it still has to match the hash.

- I recently discovered a way to disable the hash requirement so I could use a different input version (i.e. one from Guix), but doing it causes "File src/lib.rs does not exist" errors. I'm still looking into this right now, as it seems promising.

- Old IRC logs point to projects like newsboat and librsvg which also mix cargo with with another build system, but these start with cargo-build-system with phases added/replaced from the second build system. Cargo.toml doesn't exist in Mesa either (which cargo-build-system seems to depend on), so experimenting with using cargo-build-system didn't yield much.

I wanted to look more into the third bullet before responding, but I felt it would be unfortunate to have this information rot while trying to make time for hacking - hopefully it's still useful.

Cheers,

aurtzy