http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54847
--- Comment #39 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-10-08 17:16:13 UTC --- Yes, but why do you want to disable it? Why does that patch define _GLIBCXX_USE_SCHED_YIELD? That is correctly detected anyway by configure, without any changes, as I said in comment 30 and again in comment 37
