https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82644
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- Bah, now we have failures for TR1 with -std=c++17 or -std=c++2a: $ ~/gcc/8/bin/g++ -std=c++17 -include tr1/cmath -x c++ /dev/null In file included from <command-line>: /home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1163:20: error: ‘__gnu_cxx::conf_hypergf’ has not been declared using __gnu_cxx::conf_hypergf; ^~~~~~~~~~~~ /home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1164:20: error: ‘__gnu_cxx::conf_hypergl’ has not been declared using __gnu_cxx::conf_hypergl; ^~~~~~~~~~~~ /home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1165:20: error: ‘__gnu_cxx::conf_hyperg’ has not been declared using __gnu_cxx::conf_hyperg; ^~~~~~~~~~~ /home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1203:20: error: ‘__gnu_cxx::hypergf’ has not been declared using __gnu_cxx::hypergf; ^~~~~~~ /home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1204:20: error: ‘__gnu_cxx::hypergl’ has not been declared using __gnu_cxx::hypergl; ^~~~~~~ /home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1205:20: error: ‘__gnu_cxx::hyperg’ has not been declared using __gnu_cxx::hyperg; ^~~~~~