I heard that Rust is (wants to be?) good at cross-compilation. Rust itself offers multiple platforms, also for multiple architectures such as ppc, risc-v, and for multiple operating systems.
Is the process of implementing new platforms easy for rust or is it a challenge? If a new processor architecture or a new operating system is created (or becomes more popular), will it be easy to implement Rust there?
It's probably not enough in isolation, no. How much further work is needed depends on what things should be supported. E.g., is no_std support enough, or do you also need the full standard library?