rust-psp-hello

Rather than trying to run the compiler itself on a given platform, I'd recommend cross-compiling binaries from a known platform. I'm not an expert in this aspect of Rust, but here's some example Rust code that targets the PSP: https://github.com/luqmana/rust-psp-hello (AIUI the magic is in the psp.json.in file, which communicates a target specification to the compiler). Feel free to come ask in #rust on irc.mozilla.org if you need some experts to consult!

As others have mentioned, Rust does indeed support cross-compilation (and has from day one). Sadly we still need to document it fully, though our spotty docs haven't stopped community members from getting Rust code running on FreeBSD and iOS and all sorts of ARM things. For the moment it may be enlightening to read the recently-implemented Flexible Target Specification RFC (https://github.com/rust-lang/rfcs/blob/master/text/0131-targ...), which you may have seen in action via Rust on the PSP (https://github.com/luqmana/rust-psp-hello).

Yes, LLVM does (mostly) support the PSP as a target. Previously though, one would have to manually modify the rust compiler itself to recognize any new targets and basically fill in a lot of the plumbing for the new target. But thanks to the (relatively) recent Target Specs feature, teaching rustc about a new triple is as easy as writing a simple JSON file: https://github.com/luqmana/rust-psp-hello/blob/master/psp.js...