http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51749
--- Comment #22 from Paolo Carlini <paolo.carlini at oracle dot com> --- If I remember correctly, the gthr.h included by ext/atomicity.h is also a big issue. If we switch to a non-reference-counted basic_string we can make progress but another usage is in <locale>, global locale & co.
