http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54775 --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-10-02 01:01:18 UTC --- (In reply to comment #1) > That symbol is std::string::string(string&&), Sorry, that should be std::string::operator=(string&&), but otherwise my reply applies.