permissions: Handle unknown permission statuses gracefully

If an application runs on a macOS or iOS version that introduces new
permission statuses that we haven't accounted for, we don't want to
crash.

Replace Q_UNREACHABLE with a warning and Qt::PermissionStatus::Denied.

Pick-to: 6.5 6.6
Change-Id: I063042f510caaa8936742f6195bd455d09c4d9ee
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/corelib/platform/darwin/qdarwinpermissionplugin_bluetooth.mm

@@ -31,7 +31,8 @@
 
 - (Qt::PermissionStatus)currentStatus
 {
-    switch (CBCentralManager.authorization) {
+    auto status = CBCentralManager.authorization;
+    switch (status) {
     case CBManagerAuthorizationNotDetermined:
         return Qt::PermissionStatus::Undetermined;
     case CBManagerAuthorizationRestricted:
@@ -41,7 +42,8 @@
         return Qt::PermissionStatus::Granted;
     }
 
-    Q_UNREACHABLE();
+    qCWarning(lcPermissions) << "Unknown permission status" << status << "detected in" << self;
+    return Qt::PermissionStatus::Denied;
 }
 
 - (void)requestPermission:(QPermission)permission withCallback:(PermissionCallback)callback

src/corelib/platform/darwin/qdarwinpermissionplugin_calendar.mm

@@ -18,7 +18,8 @@
 
 - (Qt::PermissionStatus)currentStatus
 {
-    switch ([EKEventStore authorizationStatusForEntityType:EKEntityTypeEvent]) {
+    auto status = [EKEventStore authorizationStatusForEntityType:EKEntityTypeEvent];
+    switch (status) {
     case EKAuthorizationStatusNotDetermined:
         return Qt::PermissionStatus::Undetermined;
     case EKAuthorizationStatusRestricted:
@@ -33,7 +34,8 @@
 #endif
     }
 
-    Q_UNREACHABLE();
+    qCWarning(lcPermissions) << "Unknown permission status" << status << "detected in" << self;
+    return Qt::PermissionStatus::Denied;
 }
 
 - (QStringList)usageDescriptionsFor:(QPermission)permission

src/corelib/platform/darwin/qdarwinpermissionplugin_location.mm

@@ -73,7 +73,8 @@ struct PermissionRequest
         return Qt::PermissionStatus::Denied;
     }
 
-    switch ([self authorizationStatus]) {
+    auto status = [self authorizationStatus];
+    switch (status) {
     case kCLAuthorizationStatusRestricted:
     case kCLAuthorizationStatusDenied:
         return Qt::PermissionStatus::Denied;
@@ -89,7 +90,8 @@ struct PermissionRequest
 #endif
     }
 
-    Q_UNREACHABLE();
+    qCWarning(lcPermissions) << "Unknown permission status" << status << "detected in" << self;
+    return Qt::PermissionStatus::Denied;
 }
 
 - (CLAuthorizationStatus)authorizationStatus
@@ -118,7 +120,8 @@ struct PermissionRequest
             return Qt::PermissionStatus::Denied;
     }
 
-    Q_UNREACHABLE();
+    qCWarning(lcPermissions) << "Unknown accuracy status" << status << "detected in" << self;
+    return Qt::PermissionStatus::Denied;
 }
 
 - (QStringList)usageDescriptionsFor:(QPermission)permission

src/corelib/platform/darwin/qdarwinpermissionplugin_p_p.h

@@ -83,7 +83,9 @@ Qt::PermissionStatus nativeStatusToQtStatus(NativeStatus status)
     case Converter::Undetermined:
         return Qt::PermissionStatus::Undetermined;
     }
-    Q_UNREACHABLE();
+    qCWarning(lcPermissions) << "Unknown permission status" << status << "detected in"
+        << QT_STRINGIFY(QT_DARWIN_PERMISSION_PLUGIN);
+    return Qt::PermissionStatus::Denied;
 }
 } // namespace