The Rust compiler has supported RISC-V64GC for many years already. I got my first RISC-V SBC in 2022 and have not found a single issue with the Rust compiler (some libraries have problems, but that's a different problem). In the end, the Rust compiler relies on LLVM, which also Clang users need it in order to compile C and C++ programs to RISC-V.
