typeck.c (build_static_cast): Allow enum to enum conversions as per DR 128.

cp:
	* typeck.c (build_static_cast): Allow enum to enum conversions
	as per DR 128.
testsuite:
	* g++.old-deja/g++.other/enum3.C: New test.

From-SVN: r40187

gcc/cp/ChangeLog

 2001-03-02  Nathan Sidwell  <nathan@codesourcery.com>
 
+	* typeck.c (build_static_cast): Allow enum to enum conversions
+	as per DR 128.
+
+2001-03-02  Nathan Sidwell  <nathan@codesourcery.com>
+
 	* class.c (check_field_decls): Pointers to member do not a
 	non-pod struct make, as per DR 148.
 

gcc/cp/typeck.c

@@ -5093,6 +5093,13 @@ build_static_cast (type, expr)
 	   && TREE_CODE (type) != FUNCTION_TYPE
 	   && can_convert (intype, strip_all_pointer_quals (type)))
     ok = 1;
+  else if (TREE_CODE (intype) == ENUMERAL_TYPE
+           && TREE_CODE (type) == ENUMERAL_TYPE)
+    /* DR 128: "A value of integral _or enumeration_ type can be explicitly
+       converted to an enumeration type."
+       The integral to enumeration will be accepted by the previous clause.
+       We need to explicitly check for enumeration to enumeration.  */
+    ok = 1;
 
   /* [expr.static.cast]
 

gcc/testsuite/ChangeLog

 2001-03-02  Nathan Sidwell  <nathan@codesourcery.com>
 
+	* g++.old-deja/g++.other/enum3.C: New test.
+
+2001-03-02  Nathan Sidwell  <nathan@codesourcery.com>
+
 	* g++.old-deja/g++.other/pod1.C: New test.
 
 2001-03-02  Nathan Sidwell  <nathan@codesourcery.com>

gcc/testsuite/g++.old-deja/g++.other/enum3.C

+// Build don't link:
+
+// Copyright (C) 2001 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 28 Feb 2001 <nathan@codesourcery.com>
+
+// Bug 338 and DR 128. Allow static cast to convert between enums.
+
+enum E1 {e1};
+enum E2 {e2};
+
+E2 Foo (E1 e)
+{
+  return static_cast <E2> (e);
+}