re PR c++/4494 (Possible problem with compiler warnings on main())

	PR c++/4494
	* decl.c (start_function): Use same_type_p to check return type
	of main.

	* g++.dg/warn/main.C: New test.

From-SVN: r66476

gcc/cp/ChangeLog

+2003-05-05  Kriang Lerdsuwanakij  <lerdsuwa@users.sourceforge.net>
+
+	PR c++/4494
+	* decl.c (start_function): Use same_type_p to check return type
+	of main.
+
 2003-05-03  Zack Weinberg  <zack@codesourcery.com>
 
 	PR c/10604

gcc/cp/decl.c

@@ -13382,8 +13382,9 @@ start_function (tree declspecs, tree declarator, tree attrs, int flags)
 	ctype = TYPE_METHOD_BASETYPE (fntype);
       else if (DECL_MAIN_P (decl1))
 	{
-	  /* If this doesn't return integer_type, complain.  */
-	  if (TREE_TYPE (TREE_TYPE (decl1)) != integer_type_node)
+	  /* If this doesn't return integer_type, or a typedef to
+	     integer_type, complain.  */
+	  if (!same_type_p (TREE_TYPE (TREE_TYPE (decl1)), integer_type_node))
 	    {
 	      if (pedantic || warn_return_type)
 		pedwarn ("return type for `main' changed to `int'");

gcc/testsuite/ChangeLog

+2003-05-05  Kriang Lerdsuwanakij  <lerdsuwa@users.sourceforge.net>
+
+	PR c++/4494
+	* g++.dg/warn/main.C: New test.
+
 2003-05-04  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* gcc.dg/nonnull-3.c: New test.

gcc/testsuite/g++.dg/warn/main.C

+// { dg-do compile }
+
+// Origin: Donald W. Gillies <dgillies@graviton.com>
+
+// PR c++/4494: Incorrect diagnostics about return type of main.
+
+typedef int int_t;
+
+int_t main() {
+
+}