Thanks for the update @tlively. I agree with your assessment that we should continue deferring to emcc for projects that want to target an emulated POSIX environment.
Tangentially, I’ve heard from @wycats that he needs to be able to generate no_std wasm binaries that are very minimal and contain no extra binary gunk that strictly necessary, and has had problems in the past doing so. ISTM that it should be possible to do a no_std build against emcc without pulling in any more of the emscripten runtime and glue than necessary, but I don’t know. A non-emscripten wasm target would also be good far that use case.