parse.y: Add ...

        * parse.y: Add ... IDENTIFIER SCOPE and ... PTYPENAME SCOPE expansions.
        * decl.c (make_typename_type): Handle getting a class template.
        * search.c (lookup_field_r): A class template is good enough for
        want_type.

        * call.c (convert_like_real): Only use cp_convert for the bad part.
        (standard_conversion): Also allow bad int->enum.
        * typeck.c (ptr_reasonably_similar): Also allow functions to
        interconvert.  Pointers to same-size integers are reasonably
        similar.

        * cvt.c (convert_to_void): If we build a new COND_EXPR, always
        give it void type.

From-SVN: r47060

gcc/cp/ChangeLog

+2001-11-15  Jason Merrill  <jason@redhat.com>
+
+	* parse.y: Add ... IDENTIFIER SCOPE and ... PTYPENAME SCOPE expansions.
+	* decl.c (make_typename_type): Handle getting a class template.
+	* search.c (lookup_field_r): A class template is good enough for
+	want_type.
+
+	* call.c (convert_like_real): Only use cp_convert for the bad part.
+	(standard_conversion): Also allow bad int->enum.
+	* typeck.c (ptr_reasonably_similar): Also allow functions to
+	interconvert.  Pointers to same-size integers are reasonably
+	similar.
+
+	* cvt.c (convert_to_void): If we build a new COND_EXPR, always
+	give it void type.
+
 2001-11-15  Nathan Sidwell  <nathan@codesourcery.com>
 
 	PR g++/3154

gcc/cp/call.c

@@ -753,6 +753,14 @@ standard_conversion (to, from, expr)
       conv = build_conv (STD_CONV, to, conv);
       ICS_BAD_FLAG (conv) = 1;
     }
+  else if (tcode == ENUMERAL_TYPE && fcode == INTEGER_TYPE
+	   && TYPE_PRECISION (to) == TYPE_PRECISION (from))
+    {
+      /* For backwards brain damage compatibility, allow interconversion of
+	 enums and integers with a pedwarn.  */
+      conv = build_conv (STD_CONV, to, conv);
+      ICS_BAD_FLAG (conv) = 1;
+    }
   else if (tcode == POINTER_TYPE && fcode == POINTER_TYPE)
     {
       enum tree_code ufcode = TREE_CODE (TREE_TYPE (from));
@@ -3748,7 +3756,7 @@ convert_like_real (convs, expr, fn, argnum, inner)
       tree t = convs; 
       for (; t; t = TREE_OPERAND (t, 0))
 	{
-	  if (TREE_CODE (t) == USER_CONV)
+	  if (TREE_CODE (t) == USER_CONV || !ICS_BAD_FLAG (t))
 	    {
 	      expr = convert_like_real (t, expr, fn, argnum, 1);
 	      break;

gcc/cp/cvt.c

@@ -936,9 +936,7 @@ convert_to_void (expr, implicit)
         tree new_op1 = convert_to_void (op1, implicit);
         tree new_op2 = convert_to_void (op2, implicit);
         
-        if (new_op1 != op1 || new_op2 != op2)
-          expr = build (COND_EXPR,
-                        implicit ? TREE_TYPE (expr) : void_type_node,
+	expr = build (COND_EXPR, void_type_node,
 		      TREE_OPERAND (expr, 0), new_op1, new_op2);
         break;
       }

gcc/cp/decl.c

@@ -5652,6 +5652,11 @@ make_typename_type (context, name, complain)
       if (TREE_CODE (name) == TEMPLATE_DECL)
 	name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
     }
+  if (TREE_CODE (name) == TEMPLATE_DECL)
+    {
+      cp_error ("`%D' used without template parameters", name);
+      return error_mark_node;
+    }
   if (TREE_CODE (name) != IDENTIFIER_NODE)
     my_friendly_abort (2000);
 

gcc/cp/method.c

@@ -513,6 +513,9 @@ use_thunk (thunk_fndecl, emit_p)
        referenced.  */
     TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (thunk_fndecl)) = 1;
 
+    /* But we don't want debugging information about it.  */
+    DECL_IGNORED_P (thunk_fndecl) = 1;
+
     expand_body (finish_function (0));
   }
 

gcc/cp/parse.y

@@ -3021,6 +3021,13 @@ nested_name_specifier:
 	| nested_name_specifier TEMPLATE explicit_template_type SCOPE
                 { got_scope = $$ 
 		    = make_typename_type ($1, $3, /*complain=*/1); }
+	/* Error handling per Core 125.  */
+	| nested_name_specifier IDENTIFIER SCOPE
+                { got_scope = $$ 
+		    = make_typename_type ($1, $2, /*complain=*/1); }
+	| nested_name_specifier PTYPENAME SCOPE
+                { got_scope = $$ 
+		    = make_typename_type ($1, $2, /*complain=*/1); }
 	;
 
 /* Why the @#$%^& do type_name and notype_identifier need to be expanded
@@ -3050,16 +3057,6 @@ nested_name_specifier_1:
 		}
 	| template_type SCOPE
 		{ got_scope = $$ = complete_type (TREE_TYPE ($1)); }
-/* 	These break 'const i;'
-	| IDENTIFIER SCOPE
-		{
-		 failed_scope:
-		  cp_error ("`%D' is not an aggregate typedef", 
-			    lastiddecl ? lastiddecl : $$);
-		  $$ = error_mark_node;
-		}
-	| PTYPENAME SCOPE
-		{ goto failed_scope; } */
 	;
 
 typename_sub:

gcc/cp/search.c

@@ -1367,7 +1367,8 @@ lookup_field_r (binfo, data)
 
   /* If we're looking up a type (as with an elaborated type specifier)
      we ignore all non-types we find.  */
-  if (lfi->want_type && TREE_CODE (nval) != TYPE_DECL)
+  if (lfi->want_type && TREE_CODE (nval) != TYPE_DECL
+      && !DECL_CLASS_TEMPLATE_P (nval))
     {
       if (lfi->name == TYPE_IDENTIFIER (type))
 	{
@@ -1727,9 +1728,9 @@ lookup_fnfields_1 (type, name)
 }
 
 /* Walk the class hierarchy dominated by TYPE.  FN is called for each
-   type in the hierarchy, in a breadth-first preorder traversal.  .
+   type in the hierarchy, in a breadth-first preorder traversal.
    If it ever returns a non-NULL value, that value is immediately
-   returned and the walk is terminated.  At each node FN, is passed a
+   returned and the walk is terminated.  At each node, FN is passed a
    BINFO indicating the path from the curently visited base-class to
    TYPE.  Before each base-class is walked QFN is called.  If the
    value returned is non-zero, the base-class is walked; otherwise it

gcc/cp/typeck.c

@@ -6822,6 +6822,13 @@ ptr_reasonably_similar (to, from)
 			COMPARE_BASE | COMPARE_RELAXED))
 	continue;
 
+      if (TREE_CODE (to) == INTEGER_TYPE
+	  && TYPE_PRECISION (to) == TYPE_PRECISION (from))
+	return 1;
+
+      if (TREE_CODE (to) == FUNCTION_TYPE)
+	return 1;
+
       if (TREE_CODE (to) != POINTER_TYPE)
 	return comptypes
 	  (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 

gcc/testsuite/g++.dg/ext/conv1.C

@@ -13,4 +13,7 @@ int main ()
   f (i);
   f (v);
   g (v);
+  enum { a } b = i;
+  void (*p2)(int) = p;
+  unsigned *ip = &i;
 }

gcc/testsuite/g++.dg/overload/cond1.C

+// Test that converting a COND_EXPR to void doesn't result in trying to
+// bitwise copy a class with a nontrivial copy constructor (and thus a
+// compiler abort).
+
+// { dg-options "-O" }
+
+struct A {
+  virtual ~A() { }
+};
+
+A a1, a2;
+inline A& one () { return a1; }
+inline A& two () { return a2; }
+
+inline void f (int i)
+{
+  i ? a1 : a2;
+  i ? one() : two();
+}
+
+int main ()
+{
+  f (1);
+}

gcc/testsuite/g++.dg/template/type1.C

+// Test for helpful error messages on invalid nested-name-specifiers.
+
+struct A {
+  template <class T> struct B { static int c; };
+};
+
+int A::B::c;			// { dg-error "parameters" }
+int A::C::d;			// { dg-error "no type" }