http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58721
--- Comment #22 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #20) > Unfortunately the patch regresses abi_check in libstdc++, libstdc++.so.6 now > because of the patch exports > _ZNSt12system_errorC1ESt10error_codeRKSs@@GLIBCXX_3.4.11 > _ZNSt12system_errorC2ESt10error_codeRKSs@@GLIBCXX_3.4.11 > symbols. Those will not be exported now.