The global_listener_rwlock was introduced by recent commit
13e86d947
("BUG/MEDIUM: listener: Fix race condition when updating the global mngmt
task"), but it's declared static and is not used when threads are disabled,
thus causing a warning to be emitted in this case. Let's just condition it
to thread usage to shut the warning.
This will need to be backported where the patch above is backported.
/* list of the temporarily limited listeners because of lack of resource */
static struct mt_list global_listener_queue = MT_LIST_HEAD_INIT(global_listener_queue);
static struct task *global_listener_queue_task;
-static HA_RWLOCK_T global_listener_rwlock;
+__decl_thread(static HA_RWLOCK_T global_listener_rwlock);
/* listener status for stats */
const char* li_status_st[LI_STATE_COUNT] = {