varasm.c (output_constant): Do not abort on conversions to union types between different sizes.

	* varasm.c (output_constant): Do not abort on conversions to union
	types between different sizes.

From-SVN: r104404

gcc/ChangeLog

+2005-09-18  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* varasm.c (output_constant): Do not abort on conversions to union
+	types between different sizes.
+
 2005-09-18  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/23944

gcc/varasm.c

@@ -3881,8 +3881,11 @@ output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
       HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
 
       /* Make sure eliminating the conversion is really a no-op, except with
-	 VIEW_CONVERT_EXPR to allow for wild Ada unchecked conversions.  */
-      if (type_size != op_size && TREE_CODE (exp) != VIEW_CONVERT_EXPR)
+	 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
+	 union types to allow for Ada unchecked unions.  */
+      if (type_size != op_size
+	  && TREE_CODE (exp) != VIEW_CONVERT_EXPR
+	  && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
 	internal_error ("no-op convert from %wd to %wd bytes in initializer",
 			op_size, type_size);