alt Hacker NewsThe thing about Mes is that it does riscv64 too. I don't know the current state of the support, but there is something there.
There are still many pieces of riscv64 missing in the whole thing (an equivalent to Fiwix being the most challenging right now), and realistically only x86 is currently viable. I think riscv64 is the next in line though.
Stage 3 or 4 support for the other targets is also planed. This will require some small adaptations to the compiler for 32 to 64 word size and Stack-C versions for those targets.