Undefined symbols for architecture arm64 for Unity ios integration using cocoapods

[moritz-wundke]

[REQUIRED] Step 2: Describe your environment

• Xcode version: 9.2 (9C40b)
• Firebase SDK version: Unity SDK 5.2.1
• Firebase Components: Auth, Messaging

[REQUIRED] Step 3: Describe the problem

When integrating Firebase into our Unity app using cocoapods we get the following error:

❌  Undefined symbols for architecture arm64
> Symbol: _SWIGRegisterStringCallback_AppUtil
> Referenced from: _SWIGStringHelper__cctor_m1919616954 in Bulk_Firebase.App_0.o

This is our Podfile:

source 'https://github.com/CocoaPods/Specs.git'

platform :ios, '8.0'

target 'Unity-iPhone' do
  pod 'Firebase/Core'
  pod 'Firebase/Messaging'
  pod 'Firebase/DynamicLinks'
  pod 'Firebase/Invites'
end

The pod output is as follows:

Using Firebase (5.5.0)
Using FirebaseAnalytics (5.1.0)
Using FirebaseCore (5.1.0)
Using FirebaseDynamicLinks (3.0.2)
Using FirebaseInstanceID (3.2.1)
Using FirebaseInvites (3.0.0)
Using FirebaseMessaging (3.1.0)
Using GTMOAuth2 (1.1.6)
Using GTMSessionFetcher (1.2.0)
Using GoogleAPIClientForREST (1.3.6)
Using GoogleAppMeasurement (5.1.1)
Using GoogleSignIn (4.2.0)
Using GoogleToolboxForMac (2.1.4)
Using GoogleUtilities (5.2.2)
Using Protobuf (3.6.1)
Using nanopb (0.3.8)

[morganchen12]

@moritz-wundke can you file a support ticket? It looks like part of the Unity SDK is missing from your project.

[moritz-wundke]

Ok thanks will do!

[moritz-wundke]

It turned out that one of the .a was not set for iOS. Thanks for the hint!