Pacify -DGNULIB_POSIXCHECK.

* bootstrap.conf (gnulib_modules): Add all modules suggested by
-DGNULIB_POSIXCHECK.
* src/files.c (file_name_split)
* src/getargs.c (getargs)
* src/location.c (boundary_set_from_string)
* src/output.c (output_skeleton)
* src/parse-gram.y (prologue_declaration)
* src/scan-gram.l (handle_syncline)
* src/symtab.c (symbol_new): Use mbschr and mbsrchr instead of
strchr and strrchr.  In the cases of command-line options, file
names, and thus locations, functionality may be improved.  In the
case of symbol names, there should be no functional difference as
all characters are ASCII, so the intended benefit is just warning
suppression.
(cherry picked from commit d143e9c33f)

Conflicts:

	src/output.c
	src/parse-gram.c
	src/parse-gram.h

src/files.c

@@ -205,7 +205,7 @@ file_name_split (const char *file_name,
   *base = last_component (file_name);
 
   /* Look for the extension, i.e., look for the last dot. */
-  *ext = strrchr (*base, '.');
+  *ext = mbsrchr (*base, '.');
   *tab = NULL;
 
   /* If there is an extension, check if there is a `.tab' part right

src/getargs.c

@@ -559,7 +559,7 @@ getargs (int argc, char *argv[])
       case 'F': /* -FNAME[=VALUE]. */
         {
           char* name = optarg;
-          char* value = strchr (optarg, '=');
+          char* value = mbschr (optarg, '=');
           if (value)
             *value++ = 0;
           muscle_percent_define_insert (name, command_line_location (),

src/location.c

@@ -143,11 +143,11 @@ boundary_set_from_string (boundary *bound, char *loc_str)
 {
   /* Must search in reverse since the file name field may
    * contain `.' or `:'.  */
-  char *delim = strrchr (loc_str, '.');
+  char *delim = mbsrchr (loc_str, '.');
   aver (delim);
   *delim = '\0';
   bound->column = atoi (delim+1);
-  delim = strrchr (loc_str, ':');
+  delim = mbsrchr (loc_str, ':');
   aver (delim);
   *delim = '\0';
   bound->line = atoi (delim+1);

src/output.c

@@ -595,7 +595,7 @@ output_skeleton (void)
   full_m4sugar = xstrdup (full_skeleton);
   strcpy (full_skeleton + pkgdatadirlen + 1, m4bison);
   full_m4bison = xstrdup (full_skeleton);
-  if (strchr (skeleton, '/'))
+  if (mbschr (skeleton, '/'))
     strcpy (full_skeleton, skeleton);
   else
     strcpy (full_skeleton + pkgdatadirlen + 1, skeleton);

src/parse-gram.c

@@ -2422,7 +2422,7 @@ yyreduce:
 #line 342 "src/parse-gram.y"
     {
       char const *skeleton_user = (yyvsp[0].chars);
-      if (strchr (skeleton_user, '/'))
+      if (mbschr (skeleton_user, '/'))
         {
           size_t dir_length = strlen (current_file);
           char *skeleton_build;

src/parse-gram.y

@@ -341,7 +341,7 @@ prologue_declaration:
 | "%skeleton" STRING
     {
       char const *skeleton_user = $2;
-      if (strchr (skeleton_user, '/'))
+      if (mbschr (skeleton_user, '/'))
         {
           size_t dir_length = strlen (current_file);
           char *skeleton_build;

src/scan-gram.l

@@ -941,8 +941,8 @@ handle_syncline (char *args, location loc)
 {
   char *after_num;
   unsigned long int lineno = strtoul (args, &after_num, 10);
-  char *file = strchr (after_num, '"') + 1;
-  *strchr (file, '"') = '\0';
+  char *file = mbschr (after_num, '"') + 1;
+  *mbschr (file, '"') = '\0';
   if (INT_MAX <= lineno)
     {
       warn_at (loc, _("line number overflow"));

src/symtab.c

@@ -68,7 +68,7 @@ symbol_new (uniqstr tag, location loc)
 
   /* If the tag is not a string (starts with a double quote), check
      that it is valid for Yacc. */
-  if (tag[0] != '\"' && tag[0] != '\'' && strchr (tag, '-'))
+  if (tag[0] != '\"' && tag[0] != '\'' && mbschr (tag, '-'))
     yacc_at (loc, _("POSIX Yacc forbids dashes in symbol names: %s"),
              tag);