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'Embedded' doesn't require supporting everyone's favorite microcontroller. Even if ESP32 is really popular, there's plenty of others. OBTW experimental xtensa backend is landing in upstream llvm lately.

That were just the examples when Rust is not really suitable as a drop-in replacement for C/C++. Of course, if your platform is well-supported by Rust compiler and you don't have to write safety critical applications, then using Rust is just a matter of choice.

I don't argue whether it's good or bad language. It's a quite interesting one with its own pros and cons. If it fits you, then it's great, but you should know its limitations.

It took me two hours to compile the esp32 fork of rustc on a 2015 macbook pro. Not ideal, but it works just fine.

That's very interesting! Do you have any pointers on how to do that?

Follow https://github.com/MabezDev/xtensa-rust-quickstart.

Certified toolchains only factor into play in DAL A for DO178. Either that or manually inspecting the compiler output and tracing it to the source.