[Bug] Incompatible grPC-Core Version for Xcode Version 16.3+

[aryansaurav]

Description

gRPC-Core Pod is not compatible with Xcode Versions 16.3 onwards

[Error Message]: A template argument list is expected after a name prefixed by the template keyword
[Error Location]: gPRC-c++ > Implementation > basic_seq.h > PollNonEmpty() > Construct(&state_, Traits::template CallSeqFactory(f_, *cur_, std::move(arg)));

This is similar to the issue raised on the firebase-ios-sdk
firebase/firebase-ios-sdk#14643 (comment)

However, the solution provided there was to modify a system file manually, or use Swift Package Manger instead of cocoa pods. Manual change is not recommend for technical reasons. And, I guess using Swift Package Manger is not an easy option for many Unity Developers.

Can you please tell us if there is an update coming to fix this issue?

I have tested Firebase Unity sdk versions 11.9.0 , 12.0.0 and 13.0.0 as well. But the issue remains there.

Reproducing the issue

No response

Firebase Unity SDK Version

11.9.0

Unity editor version

6000.2.6f2

Installation Method

.unitypackage

Problematic Firebase Component(s)

Firestore

Other Firebase Component(s) in use

No response

Additional SDKs you are using

No response

Targeted Platform(s)

Apple Platforms

Unity editor platform

Mac

Scripting Runtime

IL2CPP

Release Distribution Type

Pre-built SDK from https://firebase.google.com/download/unity

Relevant Log Output

[Error Message]: A template argument list is expected after a name prefixed by the template keyword
[Error Location]: gPRC-c++ > Implementation > basic_seq.h > PollNonEmpty() > Construct(&state_, Traits::template CallSeqFactory(f_, *cur_, std::move(arg)));

If using CocoaPods for Apple platforms, the project's Podfile.lock

Expand Podfile.lock snippet

👀 Replace this line with the contents of your Podfile.lock!

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[niccolo-hare]

Hi @aryansaurav, thanks for reaching out. Just to provide you with an update, I'm still looking into this. We're curious about which version of gRPC your build is currently using. So to help with our investigation, would you be able to share your Podfile.lock file?

[aryansaurav]

Thanks @niccolo-hare for getting back. Here are the relevant entries corresponding to firebase from Podlock.file

  - Firebase/Analytics (10.24.0):
    - Firebase/Core
  - Firebase/Auth (10.24.0):
    - Firebase/CoreOnly
    - FirebaseAuth (~> 10.24.0)
  - Firebase/Core (10.24.0):
    - Firebase/CoreOnly
    - FirebaseAnalytics (~> 10.24.0)
  - Firebase/CoreOnly (10.24.0):
    - FirebaseCore (= 10.24.0)
  - Firebase/Database (10.24.0):
    - Firebase/CoreOnly
    - FirebaseDatabase (~> 10.24.0)
  - Firebase/Firestore (10.24.0):
    - Firebase/CoreOnly
    - FirebaseFirestore (~> 10.24.0)
  - Firebase/Messaging (10.24.0):
    - Firebase/CoreOnly
    - FirebaseMessaging (~> 10.24.0)
  - Firebase/RemoteConfig (10.24.0):
    - Firebase/CoreOnly
    - FirebaseRemoteConfig (~> 10.24.0)
  - Firebase/Storage (10.24.0):
    - Firebase/CoreOnly
    - FirebaseStorage (~> 10.24.0)
  - FirebaseABTesting (10.29.0):
    - FirebaseCore (~> 10.0)
  - FirebaseAnalytics (10.24.0):
    - FirebaseAnalytics/AdIdSupport (= 10.24.0)
    - FirebaseCore (~> 10.0)
    - FirebaseInstallations (~> 10.0)
    - GoogleUtilities/AppDelegateSwizzler (~> 7.11)
    - GoogleUtilities/MethodSwizzler (~> 7.11)
    - GoogleUtilities/Network (~> 7.11)
    - "GoogleUtilities/NSData+zlib (~> 7.11)"
    - nanopb (< 2.30911.0, >= 2.30908.0)
  - FirebaseAnalytics/AdIdSupport (10.24.0):
    - FirebaseCore (~> 10.0)
    - FirebaseInstallations (~> 10.0)
    - GoogleAppMeasurement (= 10.24.0)
    - GoogleUtilities/AppDelegateSwizzler (~> 7.11)
    - GoogleUtilities/MethodSwizzler (~> 7.11)
    - GoogleUtilities/Network (~> 7.11)
    - "GoogleUtilities/NSData+zlib (~> 7.11)"
    - nanopb (< 2.30911.0, >= 2.30908.0)
  - FirebaseAppCheckInterop (10.29.0)
  - FirebaseAuth (10.24.0):
    - FirebaseAppCheckInterop (~> 10.17)
    - FirebaseCore (~> 10.0)
    - GoogleUtilities/AppDelegateSwizzler (~> 7.8)
    - GoogleUtilities/Environment (~> 7.8)
    - GTMSessionFetcher/Core (< 4.0, >= 2.1)
    - RecaptchaInterop (~> 100.0)
  - FirebaseAuthInterop (10.29.0)
  - FirebaseCore (10.24.0):
    - FirebaseCoreInternal (~> 10.0)
    - GoogleUtilities/Environment (~> 7.12)
    - GoogleUtilities/Logger (~> 7.12)
  - FirebaseCoreExtension (10.29.0):
    - FirebaseCore (~> 10.0)
  - FirebaseCoreInternal (10.29.0):
    - "GoogleUtilities/NSData+zlib (~> 7.8)"
  - FirebaseDatabase (10.24.0):
    - FirebaseAppCheckInterop (~> 10.17)
    - FirebaseCore (~> 10.0)
    - FirebaseSharedSwift (~> 10.0)
    - leveldb-library (~> 1.22)
  - FirebaseFirestore (10.24.0):
    - FirebaseCore (~> 10.0)
    - FirebaseCoreExtension (~> 10.0)
    - FirebaseFirestoreInternal (= 10.24.0)
    - FirebaseSharedSwift (~> 10.0)
  - FirebaseFirestoreInternal (10.24.0):
    - abseil/algorithm (~> 1.20240116.1)
    - abseil/base (~> 1.20240116.1)
    - abseil/container/flat_hash_map (~> 1.20240116.1)
    - abseil/memory (~> 1.20240116.1)
    - abseil/meta (~> 1.20240116.1)
    - abseil/strings/strings (~> 1.20240116.1)
    - abseil/time (~> 1.20240116.1)
    - abseil/types (~> 1.20240116.1)
    - FirebaseAppCheckInterop (~> 10.17)
    - FirebaseCore (~> 10.0)
    - "gRPC-C++ (~> 1.62.0)"
    - gRPC-Core (~> 1.62.0)
    - leveldb-library (~> 1.22)
    - nanopb (< 2.30911.0, >= 2.30908.0)
  - FirebaseInstallations (10.29.0):
    - FirebaseCore (~> 10.0)
    - GoogleUtilities/Environment (~> 7.8)
    - GoogleUtilities/UserDefaults (~> 7.8)
    - PromisesObjC (~> 2.1)
  - FirebaseMessaging (10.24.0):
    - FirebaseCore (~> 10.0)
    - FirebaseInstallations (~> 10.0)
    - GoogleDataTransport (~> 9.3)
    - GoogleUtilities/AppDelegateSwizzler (~> 7.8)
    - GoogleUtilities/Environment (~> 7.8)
    - GoogleUtilities/Reachability (~> 7.8)
    - GoogleUtilities/UserDefaults (~> 7.8)
    - nanopb (< 2.30911.0, >= 2.30908.0)
  - FirebaseRemoteConfig (10.24.0):
    - FirebaseABTesting (~> 10.0)
    - FirebaseCore (~> 10.0)
    - FirebaseInstallations (~> 10.0)
    - FirebaseRemoteConfigInterop (~> 10.23)
    - FirebaseSharedSwift (~> 10.0)
    - GoogleUtilities/Environment (~> 7.8)
    - "GoogleUtilities/NSData+zlib (~> 7.8)"
  - FirebaseRemoteConfigInterop (10.29.0)
  - FirebaseSharedSwift (10.29.0)
  - FirebaseStorage (10.24.0):
    - FirebaseAppCheckInterop (~> 10.0)
    - FirebaseAuthInterop (~> 10.0)
    - FirebaseCore (~> 10.0)
    - FirebaseCoreExtension (~> 10.0)
    - GTMSessionFetcher/Core (< 4.0, >= 2.1)

[a-maurice]

Talking with folks on the iOS team, the issue is caused by using gRPC at version 1.62.x, which I see is what you're pulling in. The FirebaseFirestoreInternal pod was updated to use gPRC ~> 1.69.0 in version 11.9.0, which corresponds to the Unity SDK at 12.7.0, or newer. So it is odd that you saw this issue when trying newer versions of the SDK as well.

Ideally, updating to a newer version of the Firebase Unity SDK would work. If that isn't an option, you could try to adjust the Podfile to change the gRPC version. Either update the generated Podfile with:
pod 'gRPC-C++', '~>1.69.0'
alongside the other pods, though you'll have to be careful about that getting clobbered when doing a Unity build.

Or, you could add:

    <iosPod name="gRPC-C++" version="~>1.69.0">
    </iosPod>

to Assets/Firebase/Editor/FirestoreDependencies.xml, in the iosPods section. That will ideally add the above line to the Podfile when doing a build, which in turn should help Cocoapods use the newer version. Note though that I haven't fully tested this out, so I'm not 100% sure it would work. Ideally updating the Firebase version to one that is just doing this already would be the better option.

[aryansaurav]

Thanks @a-maurice for your response.

I did try upgrading the version manually in the Podfile to 1.69.0 (following discussion on similar issue thread of firebase-ios-sdk).

But, apparently it is a dependency for Firebase Pods version 10.24.0

[!] CocoaPods could not find compatible versions for pod "gRPC-C++":
  In Podfile:
    Firebase/Firestore (= 10.24.0) was resolved to 10.24.0, which depends on
      FirebaseFirestore (~> 10.24.0) was resolved to 10.24.0, which depends on
        FirebaseFirestoreInternal (= 10.24.0) was resolved to 10.24.0, which depends on
          gRPC-C++ (~> 1.62.0)

    gRPC-C++ (~> 1.69.0)

Do I need to upgrade the versions of Unity SDK first, then upgrade all the pods of firebase in Podfile?

[a-maurice]

Ah, ok, I was hoping that specifying the newer version would work, but I guess not. Yeah, if you upgrade to Firebase Unity 12.7.0 or newer, it will update those underlying dependencies to ~> 1.69.0, which should hopefully fix the issue you are having.