Latest stable gcc & Co.

Hallo!

I've been using for longimt emx+pgcc+libext and always found that its biggest problem was the lack of a multithreaded
libreria stdc++. Lately, however, I've encountered more and more problems, due to bugs, oldness of the C++ compiler, and
so on.
Let's suppose I was out of the OS/2 world for a while and I wanted the latest *stable* C++ compiler; what should
I install?
posix2? libext? emx? UnixOS2? Something from Innotek? Any other thing?
I'm quite disoriented...

 bye & Thanks
        av.