https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101817
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Invalid, we do some simplifications at -O0 including inlining of some builtins which includes strncmp. As I mentioned use -fno-builtins if you don't want builtins to be reconigized.