Anything that can run C++ should be able to run Rust if you use the LLVM backend, perhaps except when a watch uses musl libc and you rely on some glibc-only call in your program. afaik the only physical devices shipping with musl are car infotainment systems based on l4 kernels and networking hardware (OpenWRT).
this post was submitted on 11 Aug 2024
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Your answer wanders a bit unnecessarily IMHO.
- no-std Rust has no run-time dependencies of its own.
- std Rust runtime-requirements are basically libc, a heap allocator, and a threading library. Many implementations on many OSes are already supported, including musl on Linux. And what's not supported can theoretically be so in the future.
- Code generation at build-time is dependent on LLVM, with cranelift and (soon) GCC available as not fully mature alternatives.
- 3rd party code/crates may impose additional requirements.
I did not really mean that out of the box there would be incompatibilities, more likely within unsafe blocks and external crates
Do you mean compiler running on the Watch? Because the compiled code is no longer Rust and therefore there is no reason why it should not run on the Watch. Or do you mean specifically applications with the Rust library Egui?
I mean applications with any Rust GUI library that can interact with watch's OS.
There are two people on GH working on watchy rust firmwares