PATCH: fix fixincludes fake warnings

["Laurynas Biveinis" <lauras at softhome dot net>]

Fixincludes under DJGPP generates tens of following error messages -
error 22 (No such file or directory)) opening output (c:/djgpp/tmp/fxincaa)
for read.
However, this error is completely bogus, because fixer does not make
any output file at all if no patching is required.

Please consider this patch (tested under i686-pc-msdosdjgpp and
i686-pc-linux-gnu):

2001-01-28  Laurynas Biveinis  <lauras@softhome.net>

	* fixinc/fixincl.c (process): check if pz_temp_file exists
	before opening it.

Index: fixincl.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/fixinc/fixincl.c,v
retrieving revision 1.49
diff -u -u -p -r1.49 fixincl.c
--- fixincl.c	2001/01/05 16:28:58	1.49
+++ fixincl.c	2001/01/28 11:14:36
@@ -1428,21 +1428,23 @@ process ()
       pz_file_source = pz_temp_file;
     }
 
-  read_fd = open (pz_temp_file, O_RDONLY);
-  if (read_fd < 0)
+  if (!access(pz_temp_file, R_OK))
     {
-      fprintf (stderr, "error %d (%s) opening output (%s) for read\n",
-               errno, xstrerror (errno), pz_temp_file);
+      read_fd = open (pz_temp_file, O_RDONLY);
+      if (read_fd < 0)
+        {
+          fprintf (stderr, "error %d (%s) opening output (%s) for read\n",
+                   errno, xstrerror (errno), pz_temp_file);
+        }
+      else
+        {
+          test_for_changes (read_fd);
+          /* Unlinking a file while it is still open is a Bad Idea on
+             DOS/Windows.  */
+          close (read_fd);
+          unlink (pz_temp_file);
+        }
     }
-  else
-    {
-      test_for_changes (read_fd);
-      /* Unlinking a file while it is still open is a Bad Idea on
-         DOS/Windows.  */
-      close (read_fd);
-      unlink (pz_temp_file);
-    }
-
 # endif
   UNLOAD_DATA();
 }