diff -ruN mysql-5.5.42.orig/sql-common/client_plugin.c mysql-5.5.42/sql-common/client_plugin.c
--- mysql-5.5.42.orig/sql-common/client_plugin.c	2015-01-07 04:39:40.000000000 +0800
+++ mysql-5.5.42/sql-common/client_plugin.c	2015-03-24 10:36:45.682700014 +0800
@@ -233,6 +233,7 @@
 {
   MYSQL mysql;
   struct st_mysql_client_plugin **builtin;
+  va_list dummy;
 
   if (initialized)
     return 0;
@@ -249,7 +250,7 @@
   pthread_mutex_lock(&LOCK_load_client_plugin);
 
   for (builtin= mysql_client_builtins; *builtin; builtin++)
-    add_plugin(&mysql, *builtin, 0, 0, 0);
+    add_plugin(&mysql, *builtin, 0, 0, dummy);
 
   pthread_mutex_unlock(&LOCK_load_client_plugin);
 
@@ -293,6 +294,7 @@
 mysql_client_register_plugin(MYSQL *mysql,
                              struct st_mysql_client_plugin *plugin)
 {
+  va_list dummy;
   if (is_not_initialized(mysql, plugin->name))
     return NULL;
 
@@ -307,7 +309,7 @@
     plugin= NULL;
   }
   else
-    plugin= add_plugin(mysql, plugin, 0, 0, 0);
+    plugin= add_plugin(mysql, plugin, 0, 0, dummy);
 
   pthread_mutex_unlock(&LOCK_load_client_plugin);
   return plugin;