https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81928
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Matthieu Brucher from comment #11) > Oh, and if this is always false, why isn't it the case in debug mode? It is > then a bug according to what you said. It is always false in a valid program. If you create a situation where the this pointer is null that's a bug in your program, not in GCC.