darwin: make it possible to compile for iOS

Relocate the include of TargetConditionals.h and fixe the use of
TARGET_OS_IPHONE. Furthermore, uv__fsevents_init() and uv__fsevents_close are
now empty functions for iOS, since the FSEvents API is not available there.

include/uv-private/uv-darwin.h

@@ -26,6 +26,7 @@
 # include <mach/mach.h>
 # include <mach/task.h>
 # include <mach/semaphore.h>
+# include <TargetConditionals.h>
 # define UV_PLATFORM_SEM_T semaphore_t
 #endif
 

src/unix/darwin.c

@@ -28,11 +28,7 @@
 #include <ifaddrs.h>
 #include <net/if.h>
 
-#include <TargetConditionals.h>
+#include <CoreFoundation/CFRunLoop.h>
-
-#if !TARGET_OS_IPHONE
-#include <CoreServices/CoreServices.h>
-#endif
 
 #include <mach/mach.h>
 #include <mach/mach_time.h>

src/unix/fsevents.c

@@ -21,6 +21,21 @@
 #include "uv.h"
 #include "internal.h"
 
+#if TARGET_OS_IPHONE
+
+/* iOS (currently) doesn't provide the FSEvents-API (nor CoreServices) */
+
+int uv__fsevents_init(uv_fs_event_t* handle) {
+  return 0;
+}
+
+
+int uv__fsevents_close(uv_fs_event_t* handle) {
+  return 0;
+}
+
+#else /* TARGET_OS_IPHONE */
+
 #include <assert.h>
 #include <stdlib.h>
 #include <CoreServices/CoreServices.h>
@@ -278,3 +293,5 @@ int uv__fsevents_close(uv_fs_event_t* handle) {
 
   return 0;
 }
+
+#endif /* TARGET_OS_IPHONE */

src/unix/internal.h

@@ -62,7 +62,7 @@
 # define HAVE_KQUEUE 1
 #endif
 
-#if defined(__APPLE__) && !defined(TARGET_OS_IPHONE)
+#if defined(__APPLE__) && !TARGET_OS_IPHONE
 # include <CoreServices/CoreServices.h>
 #endif
 

src/unix/process.c

@@ -33,10 +33,6 @@
 #include <fcntl.h>
 #include <poll.h>
 
-#ifdef __APPLE__
-# include <TargetConditionals.h>
-#endif
-
 #if defined(__APPLE__) && !TARGET_OS_IPHONE
 # include <crt_externs.h>
 # define environ (*_NSGetEnviron())