C++ is super annoying in this way. Many other languages (e.g Rust) only have one compiler and good portability out of the box which completely avoids this problem. And other ecosystems that do have multiple implementation (e.g. JavaScript) seem to have much better compatibility/interop such that it's not typically a problem you have to spend much if any time on in practice.
I'm curious what sort of CPUs and OSes do those languages run on. C++ runs on all sorts of obscure real time OSes, all the standard mainstream ones as well as on embedded equipment and various CPUs, but a lot of that is possible because of the variety of compilers.
