re PR c++/19395 (invalid scope qualifier allowed in typedef)

PR c++/19395
	* decl.c (grokdeclarator): Refactor code so that qualified names
	are never allowed as the declarator in a typedef.

	PR c++/19367
	* name-lookup.c (do_nonmember_using_decl): Avoid overloading
	builtin declarations.

	PR c++/19395
	* g++.dg/parse/error24.C: New test.

	PR c++/19367
	* g++.dg/lookup/builtin1.C: New test.

From-SVN: r94466

gcc/cp/ChangeLog

@@ -1,5 +1,13 @@
 2005-01-30  Mark Mitchell  <mark@codesourcery.com>
 
+	PR c++/19395
+	* decl.c (grokdeclarator): Refactor code so that qualified names
+	are never allowed as the declarator in a typedef.
+
+	PR c++/19367
+	* name-lookup.c (do_nonmember_using_decl): Avoid overloading
+	builtin declarations.
+
 	PR c++/19457
 	* call.c (convert_like_real): Inline call to
 	dubious_conversion_warnings here.

gcc/cp/decl.c

@@ -7524,18 +7524,14 @@ grokdeclarator (const cp_declarator *declarator,
 	TYPE_FOR_JAVA (type) = 1;
 
       if (decl_context == FIELD)
-	{
-	  if (constructor_name_p (unqualified_id, current_class_type))
-	    pedwarn ("ISO C++ forbids nested type %qD with same name "
-                     "as enclosing class",
-		     unqualified_id);
-	  decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
-	}
+	decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
       else
+	decl = build_decl (TYPE_DECL, unqualified_id, type);
+      if (id_declarator && declarator->u.id.qualifying_scope)
+	error ("%Jtypedef name may not be a nested-name-specifier", decl);
+
+      if (decl_context != FIELD)
 	{
-	  decl = build_decl (TYPE_DECL, unqualified_id, type);
-	  if (in_namespace || ctype)
-	    error ("%Jtypedef name may not be a nested-name-specifier", decl);
 	  if (!current_function_decl)
 	    DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
 	  else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
@@ -7547,6 +7543,10 @@ grokdeclarator (const cp_declarator *declarator,
 	       clones.  */
 	    DECL_ABSTRACT (decl) = 1;
 	}
+      else if (constructor_name_p (unqualified_id, current_class_type))
+	pedwarn ("ISO C++ forbids nested type %qD with same name "
+		 "as enclosing class",
+		 unqualified_id);
 
       /* If the user declares "typedef struct {...} foo" then the
 	 struct will have an anonymous name.  Fill that name in now.

gcc/cp/name-lookup.c

@@ -2036,6 +2036,15 @@ do_nonmember_using_decl (tree scope, tree name, tree oldval, tree oldtype,
 	  oldval = NULL_TREE;
 	}
 
+      /* It is impossible to overload a built-in function; any
+	 explicit declaration eliminates the built-in declaration.
+	 So, if OLDVAL is a built-in, then we can just pretend it
+	 isn't there.  */
+      if (oldval 
+	  && TREE_CODE (oldval) == FUNCTION_DECL
+	  && DECL_ANTICIPATED (oldval))
+	oldval = NULL_TREE;
+
       *newval = oldval;
       for (tmp = decls.value; tmp; tmp = OVL_NEXT (tmp))
 	{
@@ -2059,33 +2068,18 @@ do_nonmember_using_decl (tree scope, tree name, tree oldval, tree oldtype,
 	      else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (new_fn)),
 		  		  TYPE_ARG_TYPES (TREE_TYPE (old_fn))))
 		{
+		  gcc_assert (!DECL_ANTICIPATED (old_fn));
+
 	          /* There was already a non-using declaration in
 		     this scope with the same parameter types. If both
 	             are the same extern "C" functions, that's ok.  */
                   if (decls_match (new_fn, old_fn))
-		    {
-		      /* If the OLD_FN was a builtin, we've seen a real 
-			 declaration in another namespace.  Use it instead.
-			 Set tmp1 to NULL so we can use the existing
-			 OVERLOAD logic at the end of this inner loop.
-		      */
-		      if (DECL_ANTICIPATED (old_fn))
-			{
-			  gcc_assert (! DECL_ANTICIPATED (new_fn));
-			  tmp1 = NULL;
-			}
-		      break;
-		    }
-		  else if (!DECL_ANTICIPATED (old_fn))
-		    {
-		      /* If the OLD_FN was really declared, the
-			 declarations don't match.  */
+		    break;
+		  else
+ 		    {
 		      error ("%qD is already declared in this scope", name);
 		      break;
 		    }
-
-		  /* If the OLD_FN was not really there, just ignore
-		     it and keep going.  */
 		}
 	    }
 

gcc/testsuite/ChangeLog

@@ -1,5 +1,11 @@
 2005-01-30  Mark Mitchell  <mark@codesourcery.com>
 
+	PR c++/19395
+	* g++.dg/parse/error24.C: New test. 
+
+	PR c++/19367
+	* g++.dg/lookup/builtin1.C: New test.
+
 	PR c++/19457
 	* g++.dg/warn/conv3.C: New test.
 

gcc/testsuite/g++.dg/lookup/builtin1.C

@@ -0,0 +1,12 @@
+// PR c++/19367
+// { dg-do link } 
+
+void abort (void) { throw 3; }
+
+namespace std { using ::abort; }
+
+int main ()
+{
+  using std::abort;
+  abort();
+}

gcc/testsuite/g++.dg/parse/error24.C

@@ -0,0 +1,7 @@
+// PR c++/19395
+
+struct A {
+  typedef int ::X; // { dg-error "" }
+};
+
+