proper error messages

Author: dgrove-oss

private/private.h

@@ -181,7 +181,7 @@ typedef mach_port_t dispatch_runloop_handle_t;
 #elif defined(__linux__)
 typedef int dispatch_runloop_handle_t;
 #else
-#error
+#error "runloop support not implemented on this platform"
 #endif
 
 #if TARGET_OS_MAC

src/queue.c

@@ -4073,7 +4073,7 @@ _dispatch_runloop_handle_is_valid(dispatch_runloop_handle_t handle)
 #elif defined(__linux__)
 	return handle >= 0;
 #else
-#error
+#error "runloop support not implemented on this platform"
 #endif
 }
 
@@ -4086,7 +4086,7 @@ _dispatch_runloop_queue_get_handle(dispatch_queue_t dq)
 #elif defined(__linux__)
 	return ((dispatch_runloop_handle_t)(uintptr_t)dq->do_ctxt) - 1;
 #else
-#error
+#error "runloop support not implemented on this platform"
 #endif
 }
 
@@ -4099,7 +4099,7 @@ _dispatch_runloop_queue_set_handle(dispatch_queue_t dq, dispatch_runloop_handle_
 #elif defined(__linux__)
 	dq->do_ctxt = (void *)(uintptr_t)(handle + 1);
 #else
-#error
+#error "runloop support not implemented on this platform"
 #endif
 }
 
@@ -4186,7 +4186,7 @@ _dispatch_runloop_queue_class_poke(dispatch_queue_t dq)
 	} while (result == -1 && errno == EINTR);
 	(void)dispatch_assume_zero(result);
 #else
-#error
+#error "runloop support not implemented on this platform"
 #endif
 }
 
@@ -5677,7 +5677,7 @@ _dispatch_runloop_queue_handle_init(void *ctxt)
 #elif defined(__linux__)
 	handle = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 #else
-#error
+#error "runloop support not implemented on this platform"
 #endif	
 	(void)dispatch_assume(_dispatch_runloop_handle_is_valid(handle));
 	_dispatch_runloop_queue_set_handle(dq, handle);
@@ -5704,7 +5704,7 @@ _dispatch_runloop_queue_handle_dispose(dispatch_queue_t dq)
 	int rc = close(handle);
 	(void)dispatch_assume_zero(rc);
 #else
-#error
+#error "runloop support not implemented on this platform"
 #endif
 }