https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92765
--- Comment #12 from Martin Sebor <msebor at gcc dot gnu.org> --- The __builtin_strcmp(ptr->header.magic, "x") call in comment #0 is undefined because the two-element array ptr->header.magic is not a nul-terminated string. The warning was designed to point that out. Removing the call removes the bug from the test case and lets it run to completion.
