> I suppose the key reason is ABI is not defined by the language standard? It is hard to define ABI in the language standard, since ABI heavily depends on the

> I suppose the key reason is ABI is not defined by the language standard? It is hard to define ABI in the language standard, since ABI heavily depends on the architecture. (The ABI specify, for example, the calling conventions and in what register goes what, which depends on what kind of register the CPU has)