Possible to build wasm modules without emscripten

[hswick]

Found a way to compile rust code without using emscripten

https://www.hellorust.com/setup/wasm-target/

Eventually this may even become easier than using emscripten and its possible other languages might do something similar. Would it be possible to generate the wasm this way as well, or are we locked into emscripten?

[mrsmkl]

Last time I checked, there were no system calls available in that setup. Anyway, it shouldn't be too hard to get rid of emscripten, or have a fork of emscripten that will directly produce wasm files that we need, we would just have to have out own version of libc etc.