title: Flutter iOS build failed after Flutter 1.22 upgrade
body: <p>I just upgraded my Flutter version to 1.22.0. After upgrading and making some changes for Firebase my Android app started working, but I am unable to build and run the iOS app on emulator or on physical device.</p>
  <p>The terminal shows the following errors when I try to run the app in the emulator or physical device. The emulator runs on iOS 14 and the physical device is on 14.0.1.</p>
  <pre><code>Emulator: ld: symbol(s) not found for architecture x86_64
  Actual device: ld: symbol(s) not found for architecture arm64
  </code></pre>
  <p>I also executed the following commands but still not working...</p>
  <pre><code>flutter clean &amp;&amp; \
  rm ios/Podfile ios/Podfile.lock pubspec.lock &amp;&amp; \
  rm -rf ios/Pods ios/Runner.xcworkspace &amp;&amp; \ 
  flutter run
  </code></pre>
  <p><strong>Flutter Doctor:</strong></p>
  <pre><code>[✓] Flutter (Channel stable, 1.22.0, on Mac OS X 10.15.7 19H2, locale en-US)
      • Flutter version 1.22.0 at /Volumes/demouser/Flutter/FlutterSDK/flutter
      • Framework revision d408d302e2 (7 days ago), 2020-09-29 11:49:17 -0700
      • Engine revision 5babba6c4d
      • Dart version 2.10.0
  
  [✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
      • Android SDK at /Users/demouserdemouser/Library/Android/sdk
      • Platform android-29, build-tools 29.0.2
      • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
      • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
      • All Android licenses accepted.
  
  [✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
      • Xcode at /Applications/Xcode.app/Contents/Developer
      • Xcode 12.0.1, Build version 12A7300
      • CocoaPods version 1.9.3
  
  [✓] Android Studio (version 4.0)
      • Android Studio at /Applications/Android Studio.app/Contents
      • Flutter plugin version 49.0.2
      • Dart plugin version 193.7547
      • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
  
  [✓] VS Code (version 1.49.2)
      • VS Code at /Applications/Visual Studio Code.app/Contents
      • Flutter extension version 3.14.1
  
  [✓] Connected device (1 available)
      • AOSP on IA Emulator (mobile) • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)
  
  • No issues found!
  </code></pre>
  <p><strong>pubspec.yaml</strong></p>
  <pre><code>name: demo
  description: demo
  version: 1.0.0+1
  
  environment:
    sdk: &quot;&gt;=2.5.2 &lt;3.0.0&quot;
  
  dependencies:
    flutter:
      sdk: flutter
  
    cupertino_icons: ^1.0.0
    firebase_auth: ^0.18.1+1
    cloud_firestore: ^0.14.1+2
    firebase_messaging: ^6.0.16
    firebase_storage: ^5.0.0-dev.2
    firebase_core: ^0.5.0
    firebase_admob: ^0.10.0+1
    intl_translation: ^0.17.10+1
    http: ^0.12.2
    xml: ^4.5.1
    shared_preferences: ^0.5.12
    flutter_staggered_grid_view: ^0.3.0
    flutter_signin_button: ^1.0.0
    image_picker: ^0.6.7+11
    mlkit: ^0.15.1
    cached_network_image: ^2.3.2+1
    permission_handler: ^5.0.1+1
    url_launcher: ^5.7.2
    share: ^0.6.5+2
    simple_connectivity: ^0.1.1
    us_states: ^1.0.3
    cloud_functions: ^0.6.0+1
    email_validator: ^1.0.4
    package_info: ^0.4.3
    device_info: ^0.4.2+8
    expandable: ^4.1.4
    launch_review: ^2.0.0
    xml2json: ^4.4.0
    purchases_flutter: ^1.3.1
  
  dev_dependencies:
    flutter_test:
      sdk: flutter
    flutter_launcher_icons: ^0.7.5
  
  flutter_icons:
    image_path: &quot;icon/new_icon.png&quot;
    android: false
    ios: true
  </code></pre>
  <p><strong>Terminal's output:</strong></p>
  <pre><code>&gt; Launching lib/main.dart on physical iPhone in debug mode...
  &gt; Automatically signing iOS for device deployment using specified
  &gt; development team in Xcode project: 5ABCDEFG9 Running Xcode build...
  &gt; Xcode build done.                                           118.3s
  &gt; Failed to build iOS app Error output from Xcode build: ↳
  &gt;     2020-10-06 10:59:58.676 xcodebuild[7528:47880]  DTDeviceKit: deviceType from a578d1d6cb0d414525f7dc4c6cee was NULL
  &gt;     2020-10-06 10:59:58.778 xcodebuild[7528:47881]  DTDeviceKit: deviceType from a578d1d6cb0d414525f7dc4c6cee was NULL
  &gt;     2020-10-06 10:59:58.778 xcodebuild[7528:47881]  DTDeviceKit: deviceType from a578d1d6cb0d414525f7dc4c6cee was NULL
  &gt;     ** BUILD FAILED **
  Xcode's output:
  ↳
      /Volumes/driveD/Flutter/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-5.7.2/ios/Classes/FLTURLLauncherPlugin.m:153:57: warning: 'keyWindow' is deprecated: first deprecated in iOS 13.0 - Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes [-Wdeprecated-declarations]
                                                             .keyWindow.rootViewController];
                                                              ^
      In module 'UIKit' imported from /Volumes/driveD/projects/new/demo/ios/Pods/Target Support Files/url_launcher/url_launcher-prefix.pch:2:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIApplication.h:134:51: note: 'keyWindow' has been explicitly marked deprecated here
      @property(nullable, nonatomic,readonly) UIWindow *keyWindow API_DEPRECATED(&quot;Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes&quot;, ios(2.0, 13.0));
  
  
     -------
   ld: symbol(s) not found for architecture arm64
      clang: error: linker command failed with exit code 1 (use -v to see invocation)
      note: Using new build system
      note: Building targets in parallel
      note: Planning build
      note: Constructing build description
  
  Could not build the precompiled application for the device.
  
  Error launching application on physical’s iPhone.
  </code></pre>
  <p>It looks like this problem is coming due to RevenueCat API. When I comment out the import <strong>purchases_flutter</strong> in the <strong>pubspec.yaml</strong> file then I am able to install the app but it crashes at startup saying connection lost.</p>