http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55741
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-12-20 11:45:56 UTC --- The point of http://gcc.gnu.org/viewcvs?view=revision&revision=193769 was that std::this_thread::sleep_for() is always available, even without --enable-libstdcxx-time=yes, so the default configuration needs to bootstrap.
