OS升級到 iOS 7.1 了 ,開發人員必須與時俱進。果斷下載更新了xcode5.1版本 ,試運行了一下已上線的應用，哇 報錯了！好頭疼

貼下報錯地方: 都是關於第三方類庫報的錯 比如parse、shareSDK

Undefined symbols for architecture x86_64:

  "_OBJC_CLASS_$_QQApiInterface", referenced from:

      objc-class-ref in AppDelegate.o

  "_OBJC_CLASS_$_ShareSDK", referenced from:

      objc-class-ref in AppDelegate.o

      objc-class-ref in RecipeDetailViewController.o

      objc-class-ref in showViewController.o

      objc-class-ref in video_show.o

  "_OBJC_CLASS_$_TencentOAuth", referenced from:

      objc-class-ref in AppDelegate.o

  "_OBJC_CLASS_$_WXApi", referenced from:

      objc-class-ref in AppDelegate.o

  "_OBJC_CLASS_$_WeiboApi", referenced from:

      objc-class-ref in AppDelegate.o

  "_OBJC_CLASS_$_YXApi", referenced from:

      objc-class-ref in AppDelegate.o

ld: symbol(s) not found for architecture x86_64

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

Xcode升級到5.1 新特性之一就是預設讓所有App都通過64位編譯器編譯。

目前臨時的解決辦法是 

1.把1.選中Targets—>Build Settings—>Architectures。

把build active architectures only 改為 NO。

2. 把最下面的Valid Architectures中的arm64引數刪掉就可以了

   或者：

  雙擊Architectures，選擇other，刪除$(ARCH_STANDARD)，然後增加armv7和armv7s（寫上：$(ARCHS_STANDARD_32_BIT)）。

3.clean 再build。

待發現更好的解決方案