[Bug c++/79687] [5/6/7 Regression] Wrong code with pointer-to-member

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79687

--- Comment #13 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Uh.  (sizetype) q is folded to -1 in constant_value_1.  DECL_INITIAL of "q" is
-1, that's what build_zero_init_1 did:
 177   else if (TYPE_PTR_OR_PTRMEM_P (type))
 178     init = fold (convert (type, nullptr_node));
type is offset_type.  Why is nullptr_node converted to offset_type -1?!