linux build fixes

Signed-off-by: Daniel A. Steffen <das@apple.com>

Author: das

src/internal.h

@@ -454,7 +454,7 @@ void _dispatch_log(const char *msg, ...);
  * For reporting bugs within libdispatch when using the "_debug" version of the
  * library.
  */
-#if __GNUC__
+#if __APPLE__
 #define dispatch_assert(e) do { \
 		if (__builtin_constant_p(e)) { \
 			dispatch_static_assert(e); \
@@ -472,7 +472,7 @@ static inline void _dispatch_assert(long e, long line) {
 #define dispatch_assert(e) _dispatch_assert((long)(e), __LINE__)
 #endif	/* __GNUC__ */
 
-#if __GNUC__
+#if __APPLE__
 /*
  * A lot of API return zero upon success and not-zero on fail. Let's capture
  * and log the non-zero value
@@ -491,7 +491,7 @@ static inline void _dispatch_assert(long e, long line) {
 static inline void _dispatch_assert_zero(long e, long line) {
 	if (DISPATCH_DEBUG && e) _dispatch_abort(line, e);
 }
-#define dispatch_assert_zero(e) _dispatch_assert((long)(e), __LINE__)
+#define dispatch_assert_zero(e) _dispatch_assert_zero((long)(e), __LINE__)
 #endif	/* __GNUC__ */
 
 /*

src/queue.c

@@ -4523,10 +4523,12 @@ _dispatch_return_to_kernel(void)
 void
 _dispatch_poll_for_events_4launchd(void)
 {
+#if DISPATCH_USE_KEVENT_WORKQUEUE
 	if (_dispatch_get_wlh()) {
 		dispatch_assert(_dispatch_deferred_items_get()->ddi_wlh_servicing);
 		_dispatch_event_loop_drain(KEVENT_FLAG_IMMEDIATE);
 	}
+#endif
 }
 
 #if HAVE_PTHREAD_WORKQUEUE_NARROWING

src/shims/lock.c

@@ -601,9 +601,9 @@ _dispatch_gate_wait_slow(dispatch_gate_t dgl, dispatch_lock value,
 #if HAVE_UL_UNFAIR_LOCK
 		_dispatch_unfair_lock_wait(&dgl->dgl_lock, new_value, 0, flags);
 #elif HAVE_FUTEX
-		_dispatch_futex_wait(&dgl->dgl_lock, tid_new, NULL, FUTEX_PRIVATE_FLAG);
+		_dispatch_futex_wait(&dgl->dgl_lock, new_value, NULL, FUTEX_PRIVATE_FLAG);
 #else
-		_dispatch_thread_switch(tid_new, flags, timeout++);
+		_dispatch_thread_switch(new_value, flags, timeout++);
 #endif
 		(void)timeout;
 	}