[Bug libstdc++/21405] Can't give symbol versions to templates

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21405

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #20 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-11 14:00:52 UTC ---
For DSOs you need to avoid re-exporting libstdc++ symbols without versions.
Use a linker script to assign versions and/or restrict what you export
via visibility attributes and/or use -fvisbility-default=hidden.

To pick up properly versioned symbols for UNDEFs in DSOs you have to
link the DSO against the proper libstdc++.

This is not a bug (but easy to get wrong).