[Bug libstdc++/54314] [4.8 Regression] undefined references to 'construction vtable for std::ostream-in-std::basic_ostringstream, std::allocator >'

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54314



--- Comment #38 from Jason Merrill <jason at gcc dot gnu.org> 2013-03-12 
14:03:05 UTC ---

(In reply to comment #37)

> I assumed it to be public...  So I suppose there is no way to write 
> constructor

> of fstream that would not be linked into libstdc++.so but that is how it is

> intended to work...



Other places could emit constructors (just not the VTT).  But they won't,

because of the extern explicit instantiation.