https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63478
--- Comment #2 from Dennis Clarke <dev at cor0 dot com> --- Also, this may be a simple RESOLVED WONT FIX because : https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34191 Sorry, the option -mptr64 looks to be undocumented and therefore a no no. Dennis