Convert underscores to dashes in some %define variable names.

For now, just api.push-pull and lr.keep-unreachable-states.
Maintain old names for backward compatibility.
* NEWS (2.5): Document.
* data/c.m4 (b4_identification): Update comment.
* data/yacc.c: Update access.
* doc/bison.texinfo: Update.
* etc/bench.pl.in (bench_push_parser): Update use.
* src/files.c (tr): Move to...
* src/getargs.c, src/getargs.h (tr): ... here because I can't
think of a better place to expose it.  My logic is that, for all
uses of tr so far, command-line arguments can be involved, and
getargs.h is already included.
* src/main.c (main): Update access.
* src/muscle_tab.c (muscle_percent_define_insert): Convert old
variable names to new variable names before assigning value.
* src/reader.c (reader): Update setting default.
* tests/calc.at: Update uses.
* tests/conflicts.at (Unreachable States After Conflict
Resolution): Update use.
* tests/input.at (%define enum variables): Update use.
(%define backward compatibility): New test group.
* tests/push.at: Update uses.
* tests/reduce.at: Update uses.
* tests/torture.at: Update uses.
(cherry picked from commit 812775a039)

Conflicts:

	data/c.m4
	etc/bench.pl.in
	src/parse-gram.c
	src/parse-gram.h
	tests/conflicts.at

src/files.c

@@ -1,7 +1,7 @@
 /* Open and close files for Bison.
 
    Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
-   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -136,15 +136,6 @@ xfclose (FILE *ptr)
 | Compute ALL_BUT_EXT, ALL_BUT_TAB_EXT and output files extensions. |
 `------------------------------------------------------------------*/
 
-/* In the string S, replace all characters FROM by TO.  */
-static void
-tr (char *s, char from, char to)
-{
-  for (; *s; s++)
-    if (*s == from)
-      *s = to;
-}
-
 /* Compute extensions from the grammar file extension.  */
 static void
 compute_exts_from_gf (const char *ext)

src/getargs.c

@@ -671,3 +671,11 @@ getargs (int argc, char *argv[])
   current_file = grammar_file = uniqstr_new (argv[optind]);
   MUSCLE_INSERT_C_STRING ("file_name", grammar_file);
 }
+
+void
+tr (char *s, char from, char to)
+{
+  for (; *s; s++)
+    if (*s == from)
+      *s = to;
+}

src/getargs.h

@@ -136,4 +136,7 @@ void getargs (int argc, char *argv[]);
 void language_argmatch (char const *arg, int prio, location loc);
 void skeleton_arg (const char *arg, int prio, location loc);
 
+/** In the string \c s, replace all characters \c from by \c to.  */
+void tr (char *s, char from, char to);
+
 #endif /* !GETARGS_H_ */

src/main.c

@@ -114,7 +114,7 @@ main (int argc, char *argv[])
      declarations.  */
   timevar_push (TV_CONFLICTS);
   conflicts_solve ();
-  if (!muscle_percent_define_flag_if ("lr.keep_unreachable_states"))
+  if (!muscle_percent_define_flag_if ("lr.keep-unreachable-states"))
     {
       state_number *old_to_new = xnmalloc (nstates, sizeof *old_to_new);
       state_number nstates_old = nstates;

src/muscle-tab.c

@@ -403,10 +403,20 @@ void
 muscle_percent_define_insert (char const *variable, location variable_loc,
                               char const *value)
 {
+  char *variable_tr = NULL;
   char const *name;
   char const *loc_name;
   char const *syncline_name;
 
+  /* Permit certain names with underscores for backward compatibility.  */
+  if (0 == strcmp (variable, "api.push_pull")
+      || 0 == strcmp (variable, "lr.keep_unreachable_states"))
+    {
+      variable_tr = strdup (variable);
+      tr (variable_tr, '_', '-');
+      variable = variable_tr;
+    }
+
   MUSCLE_USER_NAME_CONVERT (name, "percent_define(", variable, ")");
   MUSCLE_USER_NAME_CONVERT (loc_name, "percent_define_loc(", variable, ")");
   MUSCLE_USER_NAME_CONVERT (syncline_name,
@@ -427,6 +437,8 @@ muscle_percent_define_insert (char const *variable, location variable_loc,
   muscle_syncline_grow (syncline_name, variable_loc);
   muscle_user_name_list_grow ("percent_define_user_variables", variable,
                               variable_loc);
+
+  free (variable_tr);
 }
 
 /* This is used for backward compatibility, e.g., "%define api.pure"

src/parse-gram.c

@@ -1,4 +1,4 @@
-/* A Bison parser, made by GNU Bison 2.4.307-8f0d-dirty.  */
+/* A Bison parser, made by GNU Bison 2.4.311-ba5c-dirty.  */
 
 /* Implementation for Bison's Yacc-like parsers in C
 
@@ -45,7 +45,7 @@
 #define YYBISON 1
 
 /* Bison version.  */
-#define YYBISON_VERSION "2.4.307-8f0d-dirty"
+#define YYBISON_VERSION "2.4.311-ba5c-dirty"
 
 /* Skeleton name.  */
 #define YYSKELETON_NAME "yacc.c"

src/parse-gram.h

@@ -1,4 +1,4 @@
-/* A Bison parser, made by GNU Bison 2.4.307-8f0d-dirty.  */
+/* A Bison parser, made by GNU Bison 2.4.311-ba5c-dirty.  */
 
 /* Interface for Bison's Yacc-like parsers in C
 

src/reader.c

@@ -556,7 +556,7 @@ reader (void)
   gram_parse ();
 
   /* Set front-end %define variable defaults.  */
-  muscle_percent_define_default ("lr.keep_unreachable_states", "false");
+  muscle_percent_define_default ("lr.keep-unreachable-states", "false");
   {
     char *lr_type;
     /* IELR would be a better default, but LALR is historically the