https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118016
--- Comment #3 from Joseph S. Myers <jsm28 at gcc dot gnu.org> --- For C, see https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1361.htm and the minutes https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1380.pdf where it was accepted (thus reverting an abortive attempt to remove constants from FLT_EVAL_METHOD).