https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105569
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Actually this is probably a better fix; I don't suppose we want to issue
warnings for the compiler-generated POINTER_PLUS_EXPRs.
--- a/gcc/cp/class.cc
+++ b/gcc/cp/class.cc
@@ -518,6 +518,8 @@ build_base_path (enum tree_code code,
expr = build1 (NOP_EXPR, ptr_target_type, expr);
+ suppress_warning (expr, OPT_Waddress);
+
indout:
if (!want_pointer)
{
