only define the function when used

compnerd · compnerd · commit 6899a86f2c19 · 2016-12-28T11:09:03.000-08:00
This function is only used if the pthread-workqueues QOS APIs are
available.  Guard it as such.
diff --git a/src/queue.c b/src/queue.c
@@ -5148,6 +5148,7 @@ _dispatch_trystash_to_deferred_items(dispatch_queue_t dq, dispatch_object_t dou,
 }
 #endif
 
+#if HAVE_PTHREAD_WORKQUEUE_QOS
 DISPATCH_NOINLINE
 static void
 _dispatch_queue_push_slow(dispatch_queue_t dq, dispatch_object_t dou,
@@ -5157,6 +5158,7 @@ _dispatch_queue_push_slow(dispatch_queue_t dq, dispatch_object_t dou,
 			_dispatch_root_queues_init_once);
 	_dispatch_queue_push(dq, dou, pp);
 }
+#endif
 
 DISPATCH_NOINLINE
 void

Original file line number	Diff line number	Diff line change
`@@ -5148,6 +5148,7 @@ _dispatch_trystash_to_deferred_items(dispatch_queue_t dq, dispatch_object_t dou,`
`5148`	`5148`	`}`
`5149`	`5149`	`#endif`
`5150`	`5150`
	`5151`	`+#if HAVE_PTHREAD_WORKQUEUE_QOS`
`5151`	`5152`	`DISPATCH_NOINLINE`
`5152`	`5153`	`static void`
`5153`	`5154`	`_dispatch_queue_push_slow(dispatch_queue_t dq, dispatch_object_t dou,`
`@@ -5157,6 +5158,7 @@ _dispatch_queue_push_slow(dispatch_queue_t dq, dispatch_object_t dou,`
`5157`	`5158`	`_dispatch_root_queues_init_once);`
`5158`	`5159`	`_dispatch_queue_push(dq, dou, pp);`
`5159`	`5160`	`}`
	`5161`	`+#endif`
`5160`	`5162`
`5161`	`5163`	`DISPATCH_NOINLINE`
`5162`	`5164`	`void`