> The closest I've seen to this working is maybe games written in C++ that can be fairly easily built for different mobile platforms with a few native language

> The closest I've seen to this working is maybe games written in C++ that can be fairly easily built for different mobile platforms with a few native language bits done via a bridge where needed. Speaking for the game industry, C++ is probably the only thing you can use almost everywhere. Some handhelds/consoles have certification gates and their own weird compilers. And almost every platform that runs games can run native code to some extent. Even browsers lately, if indirectly, with stuff like Emscripten and PNaCl. So languages that compile to C (like Chicken) or have embeddable lightweight interpreters (like Lua) are similarly portable.