https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107873
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Alexandre Oliva from comment #0) > Without SUPPORTS_ONE_ONLY, the GNU/Linux bootstrap fails because > pthread_once is not weakref'ed in libstdc++: flag_weak is set to false, so > we define __GXX_WEAK__=0. N.B. for recent glibc no pthreads symbols should be weakrefs.
