Issue Link:

#152989

Changelog Description:

On Xcode 16 beta, compilation errors are not displayed in the output of flutter run.

Impact Description:

If there are compilation errors flutter build ios/run will fail, but displays the last x lines out the Xcode output instead of a nicely formatted description of the error.

Workaround:

Use Xcode 15.

Risk:

What is the risk level of this cherry-pick?

• Low
• Medium
• High

Test Coverage:

Are you confident that your fix is well-tested by automated tests?

• Yes
• No

Validation Steps:

Run the following steps with both Xcode 15 and Xcode 16 installed (should behave the same):

$ flutter create test_create
$ cd test_create
$ open ios/Runner/AppDelegate.swift

Add code that would cause a compilation issue:

import Flutter
import UIKit

@main
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    var i = 1 + @""
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

$ flutter build ios

Output should be:

Failed to build iOS app
Swift Compiler Error (Xcode): String literals in Swift are not preceded by an '@' sign
/Users/m/Projects/test_create/ios/Runner/AppDelegate.swift:9:16


Swift Compiler Error (Xcode): Binary operator '+' cannot be applied to operands of type 'Int' and 'String'
/Users/m/Projects/test_create/ios/Runner/AppDelegate.swift:9:14


Encountered error while building for device.