https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69473
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- https://gcc.gnu.org/onlinedocs/gcc-5.3.0/cpp/System-specific-Predefined-Macros.html#System-specific-Predefined-Macros This manual, being for all systems and machines, cannot tell you what their names are, but you can use cpp -dM to see them all. ....
