Re: Add c++11 to USE_LANGUAGES

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

> My impression is that each compiler version has its own private C++ ABI, 
> compared to C where there is a defined API and you can link code from 
> multiple compilers.
If that is indeed the case, the only working scheme seems to be to wire down 
the supported C++ (compiler) version in a mk.conf variable, build that version 
as soon as anyone needs C++ (if it's not in base) and fail for any package 
requiring a higher verson, no?