X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fbison.m4;h=87c090ed8ab0791da1bcaf43618853edb2b62ffd;hb=c6f9e663d25b0980c51f609a3fe237deca168461;hp=273b641ed38cd94d27f28271260c12d3a26b777f;hpb=44d7c1c1f004fa9bfb8ec3948de2671a7958cf5b;p=gnulib.git

diff --git a/m4/bison.m4 b/m4/bison.m4
index 273b641ed..87c090ed8 100644
--- a/m4/bison.m4
+++ b/m4/bison.m4
@@ -1,13 +1,24 @@
-#serial 4
+# serial 6
 
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2005, 2009-2011 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_BISON],
 [
-  # getdate.y works with bison only.
+  # parse-datetime.y works with bison only.
   : ${YACC='bison -y'}
-  AC_SUBST(YACC)
+dnl
+dnl Declaring YACC & YFLAGS precious will not be necessary after GNULIB
+dnl requires an Autoconf greater than 2.59c, but it will probably still be
+dnl useful to override the description of YACC in the --help output, re
+dnl parse-datetime.y assuming `bison -y'.
+  AC_ARG_VAR([YACC],
+[The `Yet Another C Compiler' implementation to use.  Defaults to `bison -y'.
+Values other than `bison -y' will most likely break on most systems.])dnl
+  AC_ARG_VAR([YFLAGS],
+[YFLAGS contains the list arguments that will be passed by default to Bison.
+This script will default YFLAGS to the empty string to avoid a default value of
+`-d' given by some make applications.])dnl
 ])