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XCode 12.3 ld: entry point (_main) undefined. for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

ld: entry point (_main) undefined. for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

It was building and running with the simulator the day I created the project. But now, it does not build.

The app project does not contain a AppDelegate file. I heard on recent versions of XCode (12.3), that the file is not needed. Should I create one and if so how?

Any suggestions?

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2

Answers


  1. 0

    I have found that deleting the derived data folder found under preferences usually solves unexpected / unexplained Xcode errors. Before you delete the folder, quit Xcode and then start again afterwards.

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  2. 0

    If your project is in SwiftUI, it is probably the inconsistency of not having an App swift file or a SceneDelegate file that serves as an entry point of your app.

    If your project does not have a SceneDelagate.swift file, it should at least have an App file which looks something like belowenter image description here

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