[bfrog]

If you are going on proprietary tool chains... most of those are moving to llvm which rust is based on. In theory any proprietary toolchain based on llvm could provide rustc given incentives to do so.

If you are speaking to missing a rust compiler built on gcc, that seems to be an ongoing project with some momentum.

Realistically the most widely used architectures are now supported by rustc through llvm... x86, arm, riscv, and even to some extent xtensa now.

Power, arc, mips, sparc, and some others aren't too far away if someone cared enough.

If Linux can support Rust, I'd think that's a good sign most project can use Rust.

[humanrebar]

That's just the compilation toolchain. For better or worse, existing C projects have their whole workflows sitting on top of bespoke tools with the assumption that there is a C toolchain. And Rust projects assume cargo, etc. You're more or less doing a parallel rewrite in Rust to adopt Rust in an existing C project.

The Linux kernel already does extensive bespoke tooling and it's low level enough to skip cargo and such. It's rare to see that approach in Rust projects in the wild.