bug#67506: guix: platform: Add platform-rust-architecture.

[Efraim Flashner <efraim@flashner.co.il>]

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On Fri, Dec 01, 2023 at 02:39:44PM +0000, Jean-Pierre De Jesus Diaz via Guix-patches via wrote:
> Hello,
> 
> The patch series looks good to me.  I was thinking of something
> similar to this in order
> to add a procedure to cross compile the `std` target so that the rust
> package can use it.
> 
> I was thinking that maybe the RUST-ARCHITECTURE could be called RUST-TARGET and
> that it could be a list (RUST-TARGETS) as some GCC multilib targets
> don't have a single
> RUST-TARGET, namely arm-none-eabi and avr, but the latter only has one
> rust target
> but the intention from the existing target is to add more as needed I
> think, as the
> avr-unknown-gnu-atmega328 target is MCU specific.
> 
> But given that there are zero multilib targets present in GNU Guix as
> of now I think
> it can stay as a string.

I like rust-target better than rust-architecture.  I suppose we can look
at changing it to rust-targets later if necessary but currently rust
cross-builds aren't setup to accept a list of targets.

We can always change it later if necessary.

-- 
Efraim Flashner   <efraim@flashner.co.il>   רנשלפ םירפא
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