===================================================================
@@ -6022,7 +6022,7 @@ extern tree convert_for_initialization (tree, tre
extern int comp_ptr_ttypes (tree, tree);
extern bool comp_ptr_ttypes_const (tree, tree);
extern bool error_type_p (const_tree);
-extern int ptr_reasonably_similar (const_tree, const_tree);
+extern bool ptr_reasonably_similar (const_tree, const_tree);
extern tree build_ptrmemfunc (tree, tree, int, bool,
tsubst_flags_t);
extern int cp_type_quals (const_tree);
===================================================================
@@ -8599,10 +8599,10 @@ error_type_p (const_tree type)
}
}
-/* Returns 1 if to and from are (possibly multi-level) pointers to the same
+/* Returns true if to and from are (possibly multi-level) pointers to the same
type or inheritance-related types, regardless of cv-quals. */
-int
+bool
ptr_reasonably_similar (const_tree to, const_tree from)
{
for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from))
@@ -8614,8 +8614,11 @@ ptr_reasonably_similar (const_tree to, const_tree
return !error_type_p (to);
if (TREE_CODE (to) != TREE_CODE (from))
- return 0;
+ return false;
+ if (COMPLETE_TYPE_P (to) != COMPLETE_TYPE_P (from))
+ return false;
+
if (TREE_CODE (from) == OFFSET_TYPE
&& comptypes (TYPE_OFFSET_BASETYPE (to),
TYPE_OFFSET_BASETYPE (from),
@@ -8624,11 +8627,11 @@ ptr_reasonably_similar (const_tree to, const_tree
if (TREE_CODE (to) == VECTOR_TYPE
&& vector_types_convertible_p (to, from, false))
- return 1;
+ return true;
if (TREE_CODE (to) == INTEGER_TYPE
&& TYPE_PRECISION (to) == TYPE_PRECISION (from))
- return 1;
+ return true;
if (TREE_CODE (to) == FUNCTION_TYPE)
return !error_type_p (to) && !error_type_p (from);
===================================================================
@@ -0,0 +1,7 @@
+// PR c++/57942
+
+template<typename T> struct S { typename T::error type; };
+struct X {};
+void f(S<int>*);
+void f(...);
+void g() { f((X*)0); }