I'm not entirely sure myself, but it seems to be a bit more involved than that. I recently came across a thread [1] discussing how to add support for Objective-

I'm not entirely sure myself, but it seems to be a bit more involved than that. I recently came across a thread [1] discussing how to add support for Objective-C and it seems the approach is to compile the Obj-C to C++... I think only C and C++ are supported at this point. But I'd bet they eventually get there. The bigger problem however, is that most of the commonly used languages don't just compile to native executables. They include a runtime handling stuff like garbage collection and just-in-time compilation. Since these runtimes are usually written in C or C++, we'll get there if C compiled to asm.js gets fast enough. That's one of the goals of Emscripten :) There's a demo [2] showing off various language runtimes compiled to asm.js. I'm not sure how they perform in comparison with JS, but the REPLs work pretty well. [1] https://groups.google.com/forum/?fromgroups#!topic/emscripten-discuss/HY9yjH-EoqA https://groups.google.com/forum/?fromgroups#!topic/emscripte... [2] http://repl.it/languages http://repl.it/languages