Similar issue to robs stack trace. Release version of Xcode 12.3 (17715), trying to build a small SwiftUI app. Other projects work beautifully. Looks like it's horking when trying to evaluate run destinations. Main Thread - https://developer.apple.com/forums/content/attachment/964e8677-2627-4196-9f09-af571871f98d

I use this: func open(appPath pathString: String) {         openFromSafari("com.myapp.myapp://my.domain.com\(pathString)")         XCTAssert(app.wait(for: .runningForeground, timeout: 5))     }     private func openFromSafari(_ urlString: String) {         let safari = XCUIApplication(bundleIdentifier: "com.apple.mobilesafari")         safari.launch()         // Make sure Safari is really running before asserting         XCTAssert(safari.wait(for: .runningForeground, timeout: 5))         // Type the deeplink and execute it         let firstLaunchContinueButton = safari.buttons["Continue"]         if firstLaunchContinueButton.exists {             firstLaunchContinueButton.tap()         }         safari.textFields["Address"].tap()         let keyboardTutorialButton = safari.buttons["Continue"]         if keyboardTutorialButton.exists {             keyboardTutorialButton.tap()         }         safari.typeText(urlString)         safari.buttons["go"].tap()         let openButton = safari.buttons["Open"]         let _ = openButton.waitForExistence(timeout: 2)         if openButton.exists {             openButton.tap()         }     }

Append the -skipMacroValidation option to xcodebuild, or you can also add set it as a default via: defaults write com.apple.dt.Xcode IDESkipMacroFingerprintValidation -bool YES