https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81677
--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- There is no such thing as an array type whose element is incomplete - you can't construct, or describe, such a type in C at all, and attempts to do so have undefined behavior in C90, are constraint violations in C99 (with a slight ambiguity about the case of array parameters decaying to pointers, but it's generally understood the constraint / undefinedness applies before decay in the case). Because the type doesn't exist, neither does a pointer to such a type, as pointer types can only be derived from types that exist, not from types that don't exist.
