All of them quite portable, with enough abstraction libraries available to make it a moot point, unless I really want to dive into details.

The only programming language I actually do have care about the underlying OS is C, due to its dependency on POSIX as an extension of ANSI libc.

C++ is fairly straightforward to port across architectures, especially since most architectures today are going to be 64-bit or more.

And you can be sure that every new ISA will have a port of GCC and LLVM, a Go compiler and everything else that's worthwile.