Undefined symbols for architecture armv7 - Firebase_Auth_Future_User_result

Description of issue:
16076: ❌; Undefined symbols for architecture armv7
16077: > Symbol: _Firebase_Auth_Future_User_result
16078: > Referenced from: _AuthUtilPINVOKE_Firebase_Auth_Future_User_result_m70BB9B236844F9C99E00A8A94C26C36AEB3418F3 in Firebase.Auth.o
16079: ❌; ld: symbol(s) not found for architecture armv7
16080: ❌; clang: error: linker command failed with exit code 1 (use -v to see invocation)

Unity version: Latest 2019.2

XCode version: 11.2.1

Source control: Github.com

Local build platform: Macbook pro with Mojave 10.14.6

Build target: iOS

Relevant plugins being used (i.e. Google Play Game Services, other plugins that may perform automatic post-build behaviors) Firebase, Google SignIn

Project name: Math Pop Fiesta

Build log (relevant chunk): See above

Does it build locally from a fresh checkout? YES

Thanks,
Ash

 

I recently had very similar problems with Firebase on iOS as well, it's not a Unity Cloud Build issue (at least not in my case). It seems the Firebase plugins no longer support armv7. Unity is also deprecating support for it starting in 2020.1 I think, so the easiest solution is to just change your ios project settings to build for arm64 only.

 

You might

If you assume changing to arm64 will work, it does not. Expect the same error above with arm64 instead:

16079: ❌; ld: symbol(s) not found for architecture armv64

Right now it's March 2021, we are using Unity 2019.4.f1 and XCode 12.2

My team has been using Unity for 15+ years and came away from this issue baffled why XCode flat out fails with Firebase either on Unity Cloud build or when built locally.

We gave up on Firebase, I would say that Firebase in Unity for iOS is not a supported platform. Google is unable to provide a solution, either on forums and from our direct support requests.

I think this thread which was shut down without a solution is telling:

https://github.com/firebase/quickstart-unity/issues/725

If anyone has had success with Firebase in iOS, please share. This is a costly road to go down as a developer, it's definitely not plug-and-play like most solutions from small dev teams.