Don't assume time_t can fit into int.

* buffer.h (struct buffer.modtime): Now time_t, not int.
* fileio.c (Fvisited_file_modtime): No need for time_t cast now.
* undo.c (Fprimitive_undo): Use time_t, not int, for time_t value.

src/ChangeLog

 2011-06-02  Paul Eggert  <eggert@cs.ucla.edu>
 
+	Don't assume time_t can fit into int.
+	* buffer.h (struct buffer.modtime): Now time_t, not int.
+	* fileio.c (Fvisited_file_modtime): No need for time_t cast now.
+	* undo.c (Fprimitive_undo): Use time_t, not int, for time_t value.
+
 	Minor fixes for signed vs unsigned integers.
 	* character.h (MAYBE_UNIFY_CHAR):
 	* charset.c (maybe_unify_char):

src/buffer.h

@@ -545,7 +545,7 @@ struct buffer
      -1 means visited file was nonexistent.
      0 means visited file modtime unknown; in no case complain
      about any mismatch on next save attempt.  */
-  int modtime;
+  time_t modtime;
   /* Size of the file when modtime was set.  This is used to detect the
      case where the file grew while we were reading it, so the modtime
      is still the same (since it's rounded up to seconds) but we're actually

src/fileio.c

@@ -4990,7 +4990,7 @@ See Info node `(elisp)Modification Time' for more details.  */)
 {
   if (! current_buffer->modtime)
     return make_number (0);
-  return make_time ((time_t) current_buffer->modtime);
+  return make_time (current_buffer->modtime);
 }
 
 DEFUN ("set-visited-file-modtime", Fset_visited_file_modtime,

src/undo.c

@@ -500,7 +500,7 @@ Return what remains of the list.  */)
 		{
 		  /* Element (t high . low) records previous modtime.  */
 		  Lisp_Object high, low;
-		  int mod_time;
+		  time_t mod_time;
 		  struct buffer *base_buffer = current_buffer;
 
 		  high = Fcar (cdr);