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

[mkline at cs dot wisc.edu]

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

--- Comment #4 from Matt Kline <mkline at cs dot wisc.edu> 2012-03-30 19:19:03 
UTC ---
Where should I specify that flag? _GLIBCXX_USE_NANOSLEEP is still undefined
when I build gcc with

configure CFLAGS='-O3' --disable-bootstrap --disable-multilib
--enable-ibstdccxx-time=rt --enable-languages=c,c++