【iOS】XCode cannot run using the selected device. Choose a destination with a supported architecture in order to run on this device.

【環境：xCode 5.0.2】

把舊的code拿出來compiler，出現以下錯誤

原因為objective c 需用LLVM5.0
位置在project - > build settings - > build options - > Compiler........
如下圖

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