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

[jojelino at gmail dot com]

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

--- Comment #1 from gee <jojelino at gmail dot com> 2012-08-18 14:53:53 UTC ---
bug 53518 also has this problem.
reference type in method argument causes symbol reference of construction
vtable for ***.
so, construction vtable for * symbol must not be marked as weak in PE target.
since PE target cannot handle weak symbol.
or, just reverting the problematic commit would be good.