I might have seen that Bootstrapping Rust article, how interesting. I've been curious about Guix for a while, one of these days I need to dive in and explore deeper. I really enjoyed their article on full-source bootstrap, it's relevant now more than ever.

Building from Source All the Way Down - https://guix.gnu.org/en/blog/2023/the-full-source-bootstrap-...

> compiling Rust programs for platforms not supported by LLVM

For this, gcc-rs[1][2] is the most promising candidate.

[1] https://rust-gcc.github.io/

[2] https://github.com/Rust-GCC/gccrs