The reason why GCC rejects this code is simple: libstdc++ doesn’t support <codecvt> yet.
The C++11 support status page confirms this:
22.5 Standard code conversion facets N
The reason why GCC rejects this code is simple: libstdc++ doesn’t support <codecvt> yet.
The C++11 support status page confirms this:
22.5 Standard code conversion facets N