在嵌入 supersonic 的广告sdk时 遇到了同样的问题.
supersonic也要求加入 -ObjC

Undefined symbols for architecture armv7s:
  "_GCControllerDidDisconnectNotification",referenced from:
      -[GCControllerConnectionEventHandler observerConnection:disconnection:] in libcocos2dx iOS.a(CCController-iOS.o)
  "_GCControllerDidConnectNotification",referenced from:
      -[GCControllerConnectionEventHandler observerConnection:disconnection:] in libcocos2dx iOS.a(CCController-iOS.o)
  "_OBJC_CLASS_$_GCController",referenced from:
      objc-class-ref in libcocos2dx iOS.a(CCController-iOS.o)
     (maybe you meant: _OBJC_CLASS_$_GCControllerConnectionEventHandler)
ld: symbol(s) not found for architecture armv7s
clang: error: linker command Failed with exit code 1 (use -v to see invocation)

我用的是iphone5c，昨天使用admob的广告，这个sdk要求要将Other Linker Flags 设置成 -ObjC。不知如何解决以上报错。

解决方法：

增加两个库：
MediaPlayer.framework
GameController.framework

原因参见：

http://stackoverflow.com/questions/24844766/linking-errors-when-adding-admob-to-ios-cocos2d-x-3-2

http://www.jb51.cc/article/p-xabtfycs-ek.html