[Bug libstdc++/52680] std::this_thread::sleep_for #ifdef'd out by _GLIBCXX_USE_NANOSLEEP

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52680

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-06-05 
18:15:28 UTC ---
some ideas at http://gcc.gnu.org/ml/libstdc++/2012-05/msg00085.html