libstdc++ soname and versioning

[Paolo Carlini]

Theodore Papadopoulo wrote:

>..........................(actually there is still a
>pending core compiler ABI change pending)....
>
Indeed, I think you are right: I clearly remember Mark saying: let's
synchronize any possible library ABI  change with a core compiler
change. In my understanding, we will end up doing one further iteration
within, say, 1-2 years. Seems to me a good compromise, considering,
again 3.4.0 ->

Paolo.