ENABLE_BITCODE in xcode 7

Bitcode refers to an intermediate representation of a compiled program. The installation of iOS, tvOS, and watchOS apps by tailoring app delivery to the capabilities of the user’s particular device. Apple called this optimization,"app thinning". Note: Sliced apps are supported on devices running 9.0 and later; otherwise, the App Store delivers universal apps to customers. If you came across error like this:-

You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture arm64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

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