As in your other comment there seems to be some confusion between bootstrapping and porting here? If you want to port Rust to a new OS then you ‘just’ need to a

As in your other comment there seems to be some confusion between bootstrapping and porting here? If you want to port Rust to a new OS then you ‘just’ need to add a new build target to the compiler and then cross-compile the compiler for your OS (from an OS with existing Rust support). That may indeed be a lot of work, but it doesn’t require bootstrapping the compiler, so this project wouldn’t be of any help in that scenario.