NEWS: update.

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index 39b6e58e38e505921c209740e5933d43716e1075..e0e58cdb82b1c4644d4c56d42297138eefa104e8 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -1,8 +1,8 @@
                                                             -*- Autoconf -*-
 
 # C M4 Macros for Bison.
                                                             -*- Autoconf -*-
 
 # C M4 Macros for Bison.

-# Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009 Free Software
-# Foundation, Inc.
+
+# Copyright (C) 2002, 2004-2012 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
 
 # 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 +134,17 @@ m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])
 
 
 [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.  ##
 
 ## ---------##
 ## Values.  ##