Currently, [some pre-built version](https://github.com/code4fukui/mpy-cross-v6) for `mpy-cross` is used. But it's somewhat outdated and leads to issues. 1. Newer language features are unsupported  2. Newer architectures (i.e. `rv32imc`) are unsupported 
Currently, some pre-built version for
mpy-crossis used. But it's somewhat outdated and leads to issues.rv32imc) are unsupported