I think the simpler answer is that regardless of platform, gccrs can't yet compile core or std libraries, so println! won't work (https://github.com/Rust-GCC/gc

I think the simpler answer is that regardless of platform, gccrs can't yet compile core or std libraries, so println! won't work (https://github.com/Rust-GCC/gccrs/issues/1389 https://github.com/Rust-GCC/gccrs/issues/1389). I don't think it's about what tier is supported in rustc, as that's compiled by LLVM in that case.