title: Undefined symbols for architecture x86_64 flutter
body: <p>I'm working in an app flutter. Android working fine but in ios no. I need some help to run this on ios mobile. I'm using lib: <strong>google_maps_flutter: ^0.5.27+3</strong> and <strong>firebase_ml_vision: ^0.9.3+8</strong>. Xcode 11.4.1 and Mac os Catalina 10.15.4. Someone knows how to solve this. I didn't found yet.</p>
  
  <pre><code>flutter doctor
  [✓] Flutter (Channel stable, v1.17.0, on Mac OS X 10.15.4 19E287, locale en-BR)
  [✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
  [✓] Xcode - develop for iOS and macOS (Xcode 11.4.1)
  [✓] Android Studio (version 3.6)
  [✓] VS Code (version 1.45.0)
  [✓] Connected device (1 available)
  
  • No issues found!
  </code></pre>
  
  <p>Log Error bellow:</p>
  
  <pre><code>Undefined symbols for architecture x86_64:
    "_OBJC_CLASS_$_GMSPolyline", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapPolylineController.o)
    "_OBJC_CLASS_$_FIRVisionOnDeviceImageLabelerOptions", referenced from:
        objc-class-ref in firebase_ml_vision(ImageLabeler.o)
    "_FIRFaceLandmarkTypeLeftEar", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceLandmarkTypeMouthLeft", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceLandmarkTypeRightCheek", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceLandmarkTypeNoseBase", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceLandmarkTypeRightEye", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_GMSMarker", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapMarkerController.o)
    "_FIRFaceLandmarkTypeMouthRight", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceContourTypeLeftEye", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceContourTypeRightEye", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceContourTypeLowerLipTop", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_GMSServices", referenced from:
        objc-class-ref in AppDelegate.o
    "_FIRFaceContourTypeNoseBottom", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceLandmarkTypeLeftCheek", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceLandmarkTypeLeftEye", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_GMSMapStyle", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapController.o)
    "_FIRFaceContourTypeRightEyebrowTop", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_GMSPolygon", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapPolygonController.o)
    "_FIRFaceContourTypeUpperLipTop", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceContourTypeRightEyebrowBottom", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceContourTypeLeftEyebrowBottom", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceLandmarkTypeRightEar", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceContourTypeUpperLipBottom", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_FIRVisionCloudImageLabelerOptions", referenced from:
        objc-class-ref in firebase_ml_vision(ImageLabeler.o)
    "_OBJC_CLASS_$_GMSCameraPosition", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapController.o)
    "_kGMSMinZoomLevel", referenced from:
        _InterpretMapOptions in google_maps_flutter(GoogleMapController.o)
    "_OBJC_CLASS_$_GMSMapView", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapController.o)
    "_OBJC_CLASS_$_GMSMutablePath", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapPolygonController.o)
        objc-class-ref in google_maps_flutter(GoogleMapPolylineController.o)
    "_OBJC_CLASS_$_GMSCircle", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapCircleController.o)
    "_FIRFaceLandmarkTypeMouthBottom", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_GMSCoordinateBounds", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapController.o)
    "_OBJC_CLASS_$_GMSCameraUpdate", referenced from:
        objc-class-ref in google_maps_flutter(GoogleMapController.o)
    "_FIRFaceContourTypeLeftEyebrowTop", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_FIRVision", referenced from:
        objc-class-ref in firebase_ml_vision(FLTFirebaseMlVisionPlugin.o)
    "_OBJC_CLASS_$_FIRVisionFaceDetectorOptions", referenced from:
        objc-class-ref in firebase_ml_vision(FaceDetector.o)
    "_kGMSMaxZoomLevel", referenced from:
        _InterpretMapOptions in google_maps_flutter(GoogleMapController.o)
    "_FIRFaceContourTypeAll", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_FIRVisionBarcodeDetectorOptions", referenced from:
        objc-class-ref in firebase_ml_vision(BarcodeDetector.o)
    "_OBJC_CLASS_$_FIRApp", referenced from:
        objc-class-ref in firebase_ml_vision(FLTFirebaseMlVisionPlugin.o)
    "_FIRFaceContourTypeLowerLipBottom", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_OBJC_CLASS_$_FIRVisionImage", referenced from:
        objc-class-ref in firebase_ml_vision(FLTFirebaseMlVisionPlugin.o)
    "_FIRFaceContourTypeFace", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
    "_FIRFaceContourTypeNoseBridge", referenced from:
        ___39-[FaceDetector handleDetection:result:]_block_invoke in firebase_ml_vision(FaceDetector.o)
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>