Which version of the libstdc++ is shipped with gcc5.1

[Laurent Thévenoux]

Hello everyone,

I try to exactly determine which version of libstdc++ is shipped with
gcc 5.1.0 (built on x86-64-apple-darwin14).
The only information that I am able to find is that the library is
libstdc++6, but I do not have any more details.

Thanks,
Laurent Thevenoux