X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/812775a0391e122eff1983afea2da96c600c7307..1462fcee1ed295b24f47758b370068aa6304bb41:/data/c.m4

diff --git a/data/c.m4 b/data/c.m4
index 39b6e58e..964fc2e0 100644
--- a/data/c.m4
+++ b/data/c.m4
@@ -1,8 +1,7 @@
                                                             -*- Autoconf -*-
 
 # C M4 Macros for Bison.
-# Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009 Free Software
-# Foundation, Inc.
+# Copyright (C) 2002, 2004-2010 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -134,6 +133,17 @@ m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])
 
 
+# b4_table_value_equals(TABLE, VALUE, LITERAL)
+# --------------------------------------------
+# Without inducing a comparison warning from the compiler, check if the
+# literal value LITERAL equals VALUE from table TABLE, which must have
+# TABLE_min and TABLE_max defined.  YYID must be defined as an identity
+# function that suppresses warnings about constant conditions.
+m4_define([b4_table_value_equals],
+[m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
+               || m4_indir([b4_]$1[_max]) < $3), [1],
+       [[YYID (0)]],
+       [[((]$2[) == (]$3[))]])])
 
 ## ---------##
 ## Values.  ##