tree.h (TREE_THIS_VOLATILE): Document the effect on a function decl.

2005-04-24  Andrew Pinski  <pinskia@physics.uc.edu>

        * tree.h (TREE_THIS_VOLATILE): Document the effect on a
        function decl.

From-SVN: r98663

gcc/ChangeLog

+2005-04-24  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	* tree.h (TREE_THIS_VOLATILE): Document the effect on a
+	function decl.
+
 2005-04-24  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* config/rs6000/rs6000.c (rs6000_override_options): Use gcc_assert

gcc/tree.h

@@ -907,6 +907,9 @@ extern void tree_operand_check_failed (int, enum tree_code,
    its address should be of type `volatile WHATEVER *'.
    In other words, the declared item is volatile qualified.
    This is used in _DECL nodes and _REF nodes.
+   On a FUNCTION_DECL node, this means the function does not
+   return normally.  This is the same effect as setting
+   the attribute noreturn on the function in C.
 
    In a ..._TYPE node, means this type is volatile-qualified.
    But use TYPE_VOLATILE instead of this macro when the node is a type,