Wed Feb 28 03:56:20 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>

	* remake.c (f_mtime): Check for future timestamps; give error and mark
	file as "failed to update".

1 files changed, 22 insertions, 1 deletions

diff --git a/remake.c b/remake.c
index 528b0ba..0ba53c0 100644
--- a/remake.c
+++ b/remake.c
@@ -1,5 +1,5 @@
 /* Basic dependency engine for GNU Make.
-Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
+Copyright (C) 1988,89,90,91,92,93,94,95,96 Free Software Foundation, Inc.
 This file is part of GNU Make.
 
 GNU Make is free software; you can redistribute it and/or modify
@@ -988,6 +988,27 @@ f_mtime (file, search)
       file = file->prev;
     } while (file != 0);
 
+  {
+    /* Files can have bogus timestamps that nothing newly made will be
+       "newer" than.  Updating their dependents could just result in loops.
+       So notify the user of the anomaly by treating future files as
+       unrecoverably absent.  */
+
+    static time_t now;
+    if (mtime > now && ! file->updated)
+      {
+	/* This file's time appears to be in the future.
+	   Update our concept of the present, and compare again.  */
+	extern time_t time ();
+	if (mtime > time (&now))
+	  {
+	    error ("*** File `%s' has modification time in the future",
+		   file->name);
+	    file->update_status = 2;
+	  }
+      }
+  }
+
   return mtime;
 }