re PR c++/27292 (ICE on casts on bitfields)

	PR c++/27292
	* tree.c (rvalue): Convert bitfields to their declared types.
	PR c++/27292
	* g++.dg/conversion/bitfield4.C: New test.

From-SVN: r113339

gcc/cp/ChangeLog

 2006-04-27  Mark Mitchell  <mark@codesourcery.com>
 
+	PR c++/27292
+	* tree.c (rvalue): Convert bitfields to their declared types.
+
 	PR c++/27102
 	* typeck2.c (cxx_incomplete_type_diagnostic): Handle
 	TYPENAME_TYPE.

gcc/cp/tree.c

@@ -372,8 +372,9 @@ rvalue (tree expr)
   if (real_lvalue_p (expr))
     {
       type = is_bitfield_expr_with_lowered_type (expr);
-      if (!type)
-	type = TREE_TYPE (expr);
+      if (type)
+	return cp_convert (TYPE_MAIN_VARIANT (type), expr);
+      type = TREE_TYPE (expr);
       /* [basic.lval]
 	 
          Non-class rvalues always have cv-unqualified types.  */

gcc/testsuite/ChangeLog

+2006-04-27  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/27292
+	* g++.dg/conversion/bitfield4.C: New test.
+
 2006-04-27  Eric Christopher  <echristo@apple.com>
 
 	* gcc.dg/pragma-ms_struct.c: New.

gcc/testsuite/g++.dg/conversion/bitfield4.C

+// PR c++/27292
+
+enum ColorRole
+{
+  WindowText, Button
+};
+
+struct QPalette {
+
+ColorRole bg_role:8;
+
+ bool hasBackground();
+};
+
+
+bool
+QPalette::hasBackground ()
+{
+  return (ColorRole (bg_role) != WindowText);
+}