Universal binaries, or otherwise VM-based approach with JIT. I think Swift is moving in that direction. Just imagine you have pure Swift with no ObjC or C code

Universal binaries, or otherwise VM-based approach with JIT. I think Swift is moving in that direction. Just imagine you have pure Swift with no ObjC or C code allowed: the compiler will be able to easily build a VM binary that will be JIT'ed on the machine.