以前的项目 放到Xcode7中运行时可能会遇到以下错误：You must rebuild it with bitcode enabled (Xcodesetting ENABLE_BITCODE)

未来 Watch 应用须包含 Bitcode，iOS不强制，但 Xcode7 默认会开启 Bitcode。

如何适配？

方法一：更新library使包含Bitcode，否则会出现以下中的警告；

(null): URGENT: all bitcode will be dropped because ‘/Users/myname/Library/Mobile Documents/com~apple~CloudDocs/foldername/appname/GoogleMobileAds.framework/GoogleMobileAds(GADSlot+AdEvents.o)‘ was built without bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. Note: This will be an error in the future.

方法二：关闭Bitcode

工程设置中 buildingsetting 中搜索 bitcode 选择 no