libstdc++-v3 stability?

[Loren James Rittle]

> 1) The library ABI for gcc-3.1.x will remain fixed for the life of gcc-3.1.
> This means no-ABI-breaking fixes in gcc-3.1.x's libstdc++. We tried to do 
> this with gcc-3.0.x, but lack of symbol versioning got in the way.

Do we have a mechanism to detect such breakage?  Seems like we would
need to build a suite of dynamically-linked programs (the entire test
suite perhaps) with g++ 3.1 and then run-time link against the
libstdc++.so de jour.

Regards,
Loren