Fix compile error when building with DBUG, but without DEBUG_SYNC.

sql/slave.cc

@@ -1334,6 +1334,7 @@ static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
     unavailable (very old master not supporting UNIX_TIMESTAMP()?).
   */
 
+#ifdef ENABLED_DEBUG_SYNC
   DBUG_EXECUTE_IF("dbug.before_get_UNIX_TIMESTAMP",
                   {
                     const char act[]=
@@ -1343,6 +1344,7 @@ static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
                     DBUG_ASSERT(!debug_sync_set_action(current_thd,
                                                        STRING_WITH_LEN(act)));
                   };);
+#endif
 
   master_res= NULL;
   if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT UNIX_TIMESTAMP()")) &&
@@ -1384,6 +1386,7 @@ static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
     Note: we could have put a @@SERVER_ID in the previous SELECT
     UNIX_TIMESTAMP() instead, but this would not have worked on 3.23 masters.
   */
+#ifdef ENABLED_DEBUG_SYNC
   DBUG_EXECUTE_IF("dbug.before_get_SERVER_ID",
                   {
                     const char act[]=
@@ -1393,6 +1396,7 @@ static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
                     DBUG_ASSERT(!debug_sync_set_action(current_thd, 
                                                        STRING_WITH_LEN(act)));
                   };);
+#endif
   master_res= NULL;
   master_row= NULL;
   if (!mysql_real_query(mysql,
@@ -3081,6 +3085,7 @@ pthread_handler_t handle_slave_io(void *arg)
 
 connected:
 
+#ifdef ENABLED_DEBUG_SYNC
     DBUG_EXECUTE_IF("dbug.before_get_running_status_yes",
                     {
                       const char act[]=
@@ -3090,6 +3095,7 @@ pthread_handler_t handle_slave_io(void *arg)
                       DBUG_ASSERT(!debug_sync_set_action(thd, 
                                                          STRING_WITH_LEN(act)));
                     };);
+#endif
 
   // TODO: the assignment below should be under mutex (5.0)
   mi->slave_running= MYSQL_SLAVE_RUN_CONNECT;

sql/sql_parse.cc

@@ -2944,6 +2944,7 @@ case SQLCOM_PREPARE:
       thd->first_successful_insert_id_in_cur_stmt=
         thd->first_successful_insert_id_in_prev_stmt;
 
+#ifdef ENABLED_DEBUG_SYNC
     DBUG_EXECUTE_IF("after_mysql_insert",
                     {
                       const char act1[]=
@@ -2959,6 +2960,7 @@ case SQLCOM_PREPARE:
                                                          STRING_WITH_LEN(act2)));
                     };);
     DEBUG_SYNC(thd, "after_mysql_insert");
+#endif
     break;
   }
   case SQLCOM_REPLACE_SELECT:

sql/sql_repl.cc

@@ -897,6 +897,7 @@ impossible position";
 
       event_type=
         (Log_event_type)((uchar)(*packet)[LOG_EVENT_OFFSET+ev_offset]);
+#ifdef ENABLED_DEBUG_SYNC
       DBUG_EXECUTE_IF("dump_thread_wait_before_send_xid",
                       {
                         if (event_type == XID_EVENT)
@@ -915,6 +916,7 @@ impossible position";
                                                              STRING_WITH_LEN(act2)));
                         }
                       });
+#endif
       if (event_type == FORMAT_DESCRIPTION_EVENT)
       {
         current_checksum_alg= get_checksum_alg(packet->ptr() + ev_offset,