https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58909
--- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #17) > (In reply to Jakub Jelinek from comment #16) > The example in comment 0 fails on Fedora. Nothing in libstdc++.a causes > anything from libpthread.o to be used. However, any real program that uses std::condition_variable is likely to also use std::thread, and that will cause a dependency on symbols in libpthread.o
