ld: entry point (_main) undefined. for architecture x86_64 : Xcode 9

Question

Recently I downloaded Xcode 9 and created one sample iPhone app but the app is not able to build as it shows the following error:

ld: entry point (_main) undefined. for architecture x86_64

I searched on net about same and tried few ways like deleting derived data, restarting Xcode but still not fix the problem.

Anybody has faced similar issue?

Answer 1

Adding @UIApplicationMain fixed the issue.

@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { ... }