[Error, Xcode] Bitcode란? App Thinning ? +Bitcode 에러 해결하기

iOS 9부터는 iOS가 설치된 기기별로 최적화된 바이너리가 따로 생성되어 다운로드 되는 기능이 추가되었다.

App Thinning이라는 기술과 관련하여 XCode7부터는 BitCode라는 설정이 Build Settings에 추가되었고 기본값은 'YES'이며 이는 App Thinning을 지원한다는 의미!

 

- App Thinning ?
lets you create apps that use the most device features, occupy minimum disk space, and accommodate future updates that can be applied by Apple. Faster downloads and more space for other apps and content provides a better user experience. - iOS Developer Library

 

> 최소 디스크를 이용해 향후 업데이트와 빠른 다운로드를 제공함으로써 효율성을 증가시키는 기술


- BitCode (비트 코드) ?
Bitcode is an intermediate representation of a compiled program. Apps you upload to iTunes Connect that contain bitcode will be compiled and linked on the store. Including bitcode will allow Apple to re-optimize your app binary in the future without the need to submit a new version of your app to the store.
For iOS apps, bitcode is the default, but optional. For watchOS and tvOS apps, bitcode is required. If you provide bitcode, all apps and frameworks in the app bundle (all targets in the project) need to include bitcode

> 비트 코드는 컴파일 된 프로그램의 중간 표현입니다. 비트 코드를 포함하면 아이튠즈 커넥트에 업로드 앱은 컴파일 저장소에 연결됩니다. 비트 코드를 포함하면 애플 스토어에 앱의 새 버전을 제출할 필요 없이 미래에 앱 바이너리를 다시 최적화할 수 있고, iOS 앱의 경우 비트 코드 옵션은 선택 사항이고, watchOS 및 tvOS 앱의 비트 코드가 필수로 적용되어야 한다.  - iOS Developer Library

 

컴파일 할 때 Bitcode 관련 오류가 발생하기도 한다. 

[ ERROR ]
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...

[ 해결 방법 ]
project > Build Settings > 해당 옵션 ‘NO’ 변경