https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83834
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Jakub Jelinek from comment #3) > So, what exact symbols does it report as incompatible? > I can't reproduce with my build from Friday late evening on both targets. It happened during weekend: 2 incompatible symbols 0 _ZZSt9call_onceIMSt6threadFvvEJSt17reference_wrapperIS0_EEEvRSt9once_flagOT_DpOT0_ENKUlvE0_clEv std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#2}::operator()() const version status: incompatible GLIBCXX_3.4 type: function status: added 1 _ZZSt9call_onceIMSt6threadFvvEJSt17reference_wrapperIS0_EEEvRSt9once_flagOT_DpOT0_ENUlvE0_4_FUNEv std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#2}::_FUN() version status: incompatible GLIBCXX_3.4 type: function status: added