symbol versioning

[Benjamin Kosnik]

> I have some initial hacks at symbol versioning.

Cool. There's an outstanding PR about this: 

libstdc++/4260
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4260

> The good news is that getting
> the .so to be versioned is easy.  Bad news is hunting down all the symbols
> we need to export is going to be a pain, unless I'm overlooking something,

Yeah. I dunno what to do here.

> (How do I tell which symbols in a .so have what version?  

Dunno.

> I'm used to 'nm'
> showing symbols with @FOO_X.Y appended, but I'm not seeing that with the
> new version strings I've chosen.)

What steps have you taken so far? 

curious,
benjamin