https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66163
--- Comment #7 from Jan Hubicka <hubicka at ucw dot cz> --- > According to -fsanitize=null, there are many places in Firefox that produce > undefined behavior in followin way: > > https://bugzilla.mozilla.org/show_bug.cgi?id=1165904 > > One common example: > > static size_t offsetOfThis() { > JitFrameLayout* base = nullptr; > return reinterpret_cast<size_t>(&base->argv()[0]); > } Jason, just to double check, this is indeed an undefined and offsetof is usable only for POD? Honza
