[Bug libstdc++/51813] [4.7 Regression] -fvisibility=hidden causes std::codecvt members to be undefined

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51813

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
          Component|c++                         |libstdc++

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2012-01-13 
16:19:11 UTC ---
I see the problem: mbstate_t is hidden, so codecvt is hidden, so use_facet is
hidden.  This is indeed revealed by the fix for PR 35688.

What do we want to do about C library visibility?