Index: includes/bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.230
diff -u -F^f -r1.230 bootstrap.inc
--- includes/bootstrap.inc	6 Oct 2008 22:40:20 -0000	1.230
+++ includes/bootstrap.inc	11 Oct 2008 00:32:24 -0000
@@ -801,7 +801,7 @@ function request_uri() {
  */
 function watchdog($type, $message, $variables = array(), $severity = WATCHDOG_NOTICE, $link = NULL) {
   global $user, $base_root;
-
+  
   static $in_error_state = FALSE;
 
   // It is possible that the error handling will itself trigger an error.  In that case, we could
@@ -823,9 +823,28 @@ function watchdog($type, $message, $vari
       'timestamp'   => REQUEST_TIME,
     );
 
-    // Call the logging hooks to log/process the message
-    foreach (module_implements('watchdog', TRUE) as $module) {
-      module_invoke($module, 'watchdog', $log_message);
+    if (function_exists('module_implements')) {
+      // Call the logging hooks to log/process the message
+      foreach (module_implements('watchdog', TRUE) as $module) {
+        module_invoke($module, 'watchdog', $log_message);
+      }
+    }
+    else {
+      // This section is for handling errors that happen too early, before module.inc
+      // gets loaded. If that happens, we don't have module_implements() yet, and therefore
+      // Drupal will abort. So we log stuff to a special flat file log.
+      //
+      // Add the following line of code to settings.php if you want different logs for
+      // different sites, or if you want to change the location of the log.
+      //
+      //   $drupal_log = '/var/tmp/www.example.com.log';
+      //
+      global $drupal_log;
+      if (!$drupal_log) {
+        $drupal_log = '/tmp/drupal.log';
+      }
+
+      @file_put_contents($drupal_log, date('c') . "\n" . print_r($log_message, TRUE) . "\n", FILE_APPEND);
     }
   }
   $in_error_state = FALSE;