Undefined symbols for architecture i386:

工程运行没问题，但是使用instrument测试内存的时候爆粗了，如图

Undefined symbols for architecture i386:

  "_OBJC_CLASS_$_JPUSHRegisterEntity", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_JPUSHService", referenced from:
      objc-class-ref in BeforeMainController.o
      objc-class-ref in MainViewController.o
      objc-class-ref in LoginController.o
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture i386

clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决 方法将 build active achitecture only 中的release 和debug都设置为yes, 表示只支持当前的设备，不支持老设备。如图