--- a/gcc/plugin.h	Fri Feb 12 23:41:23 2010 +0900
+++ b/gcc/plugin.h	Mon May 24 12:47:05 2010 +0900
@@ -1,5 +1,5 @@
 /* Header file for internal GCC plugin mechanism.
-   Copyright (C) 2009 Free Software Foundation, Inc.
+   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -26,7 +26,7 @@
 
 extern void add_new_plugin (const char *);
 extern void parse_plugin_arg_opt (const char *);
-extern int invoke_plugin_callbacks (int, void *);
+extern int invoke_plugin_callbacks_full (int, void *);
 extern void initialize_plugins (void);
 extern bool plugins_active_p (void);
 extern void dump_active_plugins (FILE *);
@@ -35,6 +35,29 @@
 extern void print_plugins_help (FILE *file, const char *indent);
 extern void finalize_plugins (void);
 
+extern bool flag_plugin_added;
+
+/* Called from inside GCC.  Invoke all plugin callbacks registered with
+   the specified event.
+   Return PLUGEVT_SUCCESS if at least one callback was called,
+   PLUGEVT_NO_CALLBACK if there was no callback.
+
+   EVENT    - the event identifier
+   GCC_DATA - event-specific data provided by the compiler  */
+
+static inline int
+invoke_plugin_callbacks (int event ATTRIBUTE_UNUSED,
+			 void *gcc_data ATTRIBUTE_UNUSED)
+{
+#ifdef ENABLE_PLUGIN
+  /* True iff at least one plugin has been added.  */
+  if (flag_plugin_added)
+    return invoke_plugin_callbacks_full (event, gcc_data);
+#endif
+
+  return PLUGEVT_NO_CALLBACK;
+}
+
 /* In attribs.c.  */
 
 extern void register_attribute (const struct attribute_spec *attr);