X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fbison.m4;h=91039b1ced41170eb3b8292230a834a5fc06b03b;hb=8575b0774d7270385308b89a8d021c054db65c58;hp=273b641ed38cd94d27f28271260c12d3a26b777f;hpb=44d7c1c1f004fa9bfb8ec3948de2671a7958cf5b;p=gnulib.git

diff --git a/m4/bison.m4 b/m4/bison.m4
index 273b641ed..91039b1ce 100644
--- a/m4/bison.m4
+++ b/m4/bison.m4
@@ -1,6 +1,6 @@
 #serial 4
 
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2005 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.
@@ -9,5 +9,16 @@ AC_DEFUN([gl_BISON],
 [
   # getdate.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 getdate.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
 ])