“^”标记前的语法错误

It seems that I'm not alone ,但目前还没有人公布这个问题的解决方案。

举个例子:

此代码来自UIView.h

+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);

给出编译错误“Syntax error before'^'token”:

/var/folders/UO/UOZJs7XuF5iROp2HMSTlz++++TI/-Caches-/com.apple.Xcode.501/CompositeSDKs/iphonesimulator-iPhoneSimulator4.0-drysryiarqddqccmfooifrjfbivi/System/Library/Frameworks/UIKit.framework/Headers/UIView.h:250:0 Syntax error before '^' token in /var/folders/UO/UOZJs7XuF5iROp2HMSTlz++++TI/-Caches-/com.apple.Xcode.501/CompositeSDKs/iphonesimulator-iPhoneSimulator4.0-drysryiarqddqccmfooifrjfbivi/System/Library/Frameworks/UIKit.framework/Headers/UIView.h

它认为解决方案与构建设置有关。什么会导致这个错误?我不熟悉Objective-C中的(^)语法。