archive error: "xxx-master.dia:1:1: Could not read serialized diagnostics file: Cannot Load File: Failed to open diagnostics file"
I root caused my occurrence of this error to usage of 'Self' in a class func for a XIB UIView. The error happened for me in XCode 11.5 and only the release build of the project. So, looks like the issue is in -O compilation. (It looks like the academic project named Swift has rediscovered the useful concept of Self)
THE EXAMPLE BELOW CAUSES segfault 11, FIXED BY REPLACING THE THREE "Self" WITH CLASS NAME "StyleHSView":
class StyleHSView: UIStackView, UITextFieldDelegate { @IBOutlet weak var styleNameTF: UITextField! @IBOutlet weak var urlTF: UITextField! // THIS FUNC CAUSES segfault 11, fix by changing Self to class name StyleHSView. class func Instantiate() -> Self { let nib = UINib.init(nibName: "StyleHSView", bundle: nil) if let view = nib.instantiate(withOwner: nil, options: nil).first(where: { return $0 is Self }) as? Self { return view } else { fatalError("No StyleHSView") } }}
Similar to the experience of this commenter in the issue @foolbear commented above, this was caused by a modifier one of my views.
In my case, I was using an Introspect modifier on a UIViewRepresentable
.
In the stack dump of your error, identify the view where the issue is happening and try removing view modifiers until the error goes away.