build disappears

(Xcode 26.2, iPhone 17 Pro) I can't seem to get hardware tag checks to work in an app launched without the special Hardware Memory Tagging diagnostics. In other words, I have been unable to reproduce the crash example at 6:40 in Apple's video Secure your app with Memory Integrity Enforcement. When I write a heap overflow or a UAF, it is picked up perfectly provided I enable the Hardware Memory Tagging feature under Scheme Diagnostics. If I instead add the Enhanced Security capability with the memory-tagging related entitlements: I'm seeing distinct memory tags being assigned in pointers returned by malloc (without the capability, this is not the case) Tag mismatches are not being caught or enforced, regardless of soft mode The behaviour is the same whether I launch from Xcode without Hardware Memory Tagging, or if I launch the app by tapping it on launchpad. In case it was related to debug builds, I also tried creating an ad hoc IPA and it didn't make any difference. I realise there's a wrinkle here

I have an older project that was created before Xcode 26.2. In Xcode versions prior to 26.2, there was no Swift Compiler – Concurrency build setting. With those older versions, the following behavior occurs: a nonisolated function executes off the main thread. class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() run() } private func run() { Task { await runInMainThread() } } func runInMainThread() async { print(>>>> IN runInMainThread(), Thread.isMainThread (Thread.isMainThread)) await runInBackgroundThread() } private nonisolated func runInBackgroundThread() async { print(>>>> IN runInBackgroundThread(), Thread.isMainThread (Thread.isMainThread)) } } Output: >>>> IN runInMainThread(), Thread.isMainThread true >>>> IN runInBackgroundThread(), Thread.isMainThread false However, starting with Xcode 26.2, Apple introduced the Swift Compiler – Concurrency settings. When running the same code with the default configurati

I'm stuck in an impossible situation with DeviceActivityReportExtension on iOS 18. THE ISSUE: Configuration that works on device (iOS 18.2): Info.plist has only NSExtensionPointIdentifier Swift code uses u/main attribute App installs and runs perfectly Extension works correctly App Store validation FAILS: Missing NSExtensionPrincipalClass Adding NSExtensionPrincipalClass (as validation requests): Device installation FAILS with Error 3002 Error says: NSExtensionPrincipalClass key is not allowed for this extension point Cannot test on device Validation would likely pass ENVIRONMENT: Xcode 16.2 iOS 18.2 Extension point: com.apple.deviceactivityui.report-extension EVIDENCE IT'S WIDESPREAD: Apple Forums (3 days ago): https://developer.apple.com/forums/thread/812380 Stack Overflow (1+ year): https://stackoverflow.com/questions/77866230/ ROOT CAUSE: iOS 18 changed this extension to use u/main pattern (no NSExtensionPrincipalClass needed). App Store validation hasn't been updated and still expects iOS 17 configuratio

I'm stuck in an impossible situation with DeviceActivityReportExtension on iOS 18. THE ISSUE: Configuration that works on device (iOS 18.2): Info.plist has only NSExtensionPointIdentifier Swift code uses u/main attribute App installs and runs perfectly Extension works correctly App Store validation FAILS: Missing NSExtensionPrincipalClass Adding NSExtensionPrincipalClass (as validation requests): Device installation FAILS with Error 3002 Error says: NSExtensionPrincipalClass key is not allowed for this extension point Cannot test on device Validation would likely pass ENVIRONMENT: Xcode 16.2 iOS 18.2 Extension point: com.apple.deviceactivityui.report-extension EVIDENCE IT'S WIDESPREAD: Apple Forums (3 days ago): https://developer.apple.com/forums/thread/812380 Stack Overflow (1+ year): https://stackoverflow.com/questions/77866230/ ROOT CAUSE: iOS 18 changed this extension to use u/main pattern (no NSExtensionPrincipalClass needed). App Store validation hasn't been updated and still expects iOS 17 configuratio