plugin.c (register_plugin_info): Produce an error message if the plugin is not…

plugin.c (register_plugin_info): Produce an error message if the plugin is not found in the hash table.

	* plugin.c (register_plugin_info): Produce an error message if the
	plugin is not found in the hash table.

From-SVN: r241613

gcc/ChangeLog

+2016-10-27  Nick Clifton  <nickc@redhat.com>
+
+	* plugin.c (register_plugin_info): Produce an error message if the
+	plugin is not found in the hash table.
+
 2016-10-27  Bin Cheng  <bin.cheng@arm.com>
 
 	* match.pd ((convert1 (minmax ((convert2 (x) c)))) -> minmax (x c)):

gcc/plugin.c

@@ -330,7 +330,15 @@ static void
 register_plugin_info (const char* name, struct plugin_info *info)
 {
   void **slot = htab_find_slot (plugin_name_args_tab, name, NO_INSERT);
-  struct plugin_name_args *plugin = (struct plugin_name_args *) *slot;
+  struct plugin_name_args *plugin;
+
+  if (slot == NULL)
+    {
+      error ("unable to register info for plugin '%s' - plugin name not found",
+	     name);
+      return;
+    }
+  plugin = (struct plugin_name_args *) *slot;
   plugin->version = info->version;
   plugin->help = info->help;
 }