decl.c (grokfndecl): Require that `main' return an `int'.

	* decl.c (grokfndecl): Require that `main' return an `int'.
	* mangle.c (write_encoding): Don't mangle return types for
	conversion functions.

From-SVN: r35972

gcc/cp/ChangeLog

+2000-08-25  Mark Mitchell  <mark@codesourcery.com>
+
+	* decl.c (grokfndecl): Require that `main' return an `int'.
+	* mangle.c (write_encoding): Don't mangle return types for
+	conversion functions.
+
 2000-08-25  Gabriel Dos Reis  <gdr@codesourcery.com>
 
 	* error.c (tree_formatting_info): New data type.

gcc/cp/decl.c

@@ -8819,8 +8819,11 @@ grokfndecl (ctype, type, declarator, orig_declarator, virtualp, flags, quals,
 	error ("cannot declare `::main' to be a template");
       if (inlinep)
 	error ("cannot declare `::main' to be inline");
-      else if (! publicp)
+      if (!publicp)
 	error ("cannot declare `::main' to be static");
+      if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
+			integer_type_node))
+	error ("`main' must return `int'");
       inlinep = 0;
       publicp = 1;
     }

gcc/cp/mangle.c

@@ -643,6 +643,7 @@ write_encoding (decl)
       write_bare_function_type (fn_type, 
 				(!DECL_CONSTRUCTOR_P (decl)
 				 && !DECL_DESTRUCTOR_P (decl)
+				 && !DECL_CONV_FN_P (decl)
 				 && decl_is_template_id (decl, NULL)));
     }
 }

gcc/testsuite/g++.old-deja/g++.other/main2.C

+// Build don't link:
+// Origin: Mark Mitchell <mark@codesourcery.com>
+
+double main () {} // ERROR - main must return `int'