In cp/ChangeLog:

* tree.c (cp_build_qualified_type_real): When copying
	pointer-to-method types, unshare the record that holds
	the cached pointer-to-member-function type.
In testsuite/ChangeLog:
	* g++.dg/other/ptrmem4.C: New testcase.

From-SVN: r55725

gcc/cp/ChangeLog

@@ -1,3 +1,9 @@
+2002-07-24  Geoffrey Keating  <geoffk@redhat.com>
+
+	* tree.c (cp_build_qualified_type_real): When copying
+	pointer-to-method types, unshare the record that holds
+	the cached pointer-to-member-function type.
+
 2002-07-23  Neil Booth  <neil@daikokuya.co.uk>
 
 	* cp-tree.h (FILE_FUNCTION_PREFIX_LEN): Remove.

gcc/cp/tree.c

@@ -644,13 +644,13 @@ cp_build_qualified_type_real (type, type_quals, complain)
   result = build_qualified_type (type, type_quals);
 
   /* If this was a pointer-to-method type, and we just made a copy,
-     then we need to clear the cached associated
+     then we need to unshare the record that holds the cached
-     pointer-to-member-function type; it is not valid for the new
+     pointer-to-member-function type, because these will be distinct
-     type.  */
+     between the unqualified and qualified types.  */
   if (result != type 
       && TREE_CODE (type) == POINTER_TYPE
       && TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE)
-    TYPE_SET_PTRMEMFUNC_TYPE (result, NULL_TREE);
+    TYPE_LANG_SPECIFIC (result) = NULL;
 
   return result;
 }

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2002-07-24  Geoffrey Keating  <geoffk@redhat.com>
+
+	* g++.dg/other/ptrmem4.C: New testcase.
+
 2002-07-24  Richard Henderson  <rth@redhat.com>
 
 	* gcc.c-torture/execute/loop-2e.c: Rewrite for 64 bit and no mmap.

gcc/testsuite/g++.dg/other/ptrmem4.C

@@ -0,0 +1,18 @@
+// Bug: This checks that the pointer-to-member-function type is not
+// shared between differently-qualified pointer-to-method types.
+
+// { dg-do compile }
+struct A
+{ 
+  void f () {}
+};
+
+void (A::*const cp)() = &A::f;
+
+int main ()
+{ 
+  void (A::* p)();
+  void (A::** ip)() = &p;
+
+  *ip = &A::f;
+}