https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92688
--- Comment #6 from SODA Noriyuki <soda-gnu at yuruyuru dot net> --- > More to the point is glibc still does not do the right thing for what is > needed to support C++11 and above: hmm, thanks. the pthread symbols in PR 21327 become visible with -D_XOPEN_SOURCE=700 without -D_GNU_SOURCE. the M_PI symbol in PR 11196 becomes visbile with -D_XOPEN_SOURCE=700 too. is there any other symbols which are necessary for -std=c++11, but invisible with -D_XOPEN_SOURCE=700 ?
