Getting bunch of errors while integrating unity as library into ios native project, in which both unity and native project contains Firebase libraries.

[vishnunairvp]

I have an iOS native project and a Unity project.

What i am trying to achieve? - On a button click from the native ios app, i want to show unity in which both the native and ios project contains firebase dependencies. What i am actually getting? - When i try to run the app in xcode, i am getting following errors (almost 4000 similar error but for different Targets): "Multiple commands produce '/Users/M_742794/Library/Developer/Xcode/DerivedData/MarkersLab-gpaeablwazuyowbfwysavwxcotrv/Build/Products/Debug-iphoneos/BoringSSL-GRPC/openssl_grpc.framework/Headers/cipher.h': 1) Target 'BoringSSL-GRPC' (project 'Pods') has copy command from '/Users/M_742794/Developer/iOS/Development/iOS AR Build/Pods/BoringSSL-GRPC/src/include/openssl/cipher.h' to '/Users/M_742794/Library/Developer/Xcode/DerivedData/MarkersLab-gpaeablwazuyowbfwysavwxcotrv/Build/Products/Debug-iphoneos/BoringSSL-GRPC/openssl_grpc.framework/Headers/cipher.h' 2) Target 'BoringSSL-GRPC' (project 'Pods') has copy command from '/Users/M_742794/Developer/iOS/Development/unity-AR-Build/Pods/BoringSSL-GRPC/src/include/openssl/cipher.h' to '/Users/M_742794/Library/Developer/Xcode/DerivedData/MarkersLab-gpaeablwazuyowbfwysavwxcotrv/Build/Products/Debug-iphoneos/BoringSSL-GRPC/openssl_grpc.framework/Headers/cipher.h'"

Steps i followed for unity integration to my native project -

1. imported Firebase libraries like Auth, storage, firestore, core in unity and created an iOS build.
2. Podfile has been generated after the build and i installed the firebase pods.
3. I have added the Unity-iPhone.xcodeproj along with its Pods.xcodeproj to my native project workspace with the project structure as below(masked is my native xcodeproj):

4. followed the steps mentioned in this uaal link https://github.com/Unity-Technologies/uaal-example/blob/master/docs/ios.md properly like:

   1. Added UnityFramework.framework to the native app general settings framework, libraries and embedded content and removed the same from Build phases Link binary with libraries section.
   2. Added Unity-iPhone.xcodeproj's Data folder target membership to UnityFramework.
   3. Added Unity-iPhone.xcodeproj's NativeCallProxy file target membership to UnityFramework with public access.
   4. made code changes in native project to show unity on button click.

5. I have firebase dependencies in my native xcode project as well as unity xcode project and the podfiles are as below:

   • Unity Xcode project Podfile:

   • Native Xcode project Podfile:

6. I have installed the pods for both the projects and started building in xcode.

7. The build is failing with number of "Multiple commands produce" errors:

8. The errors might be causing due to firebase dependency in both native and unity projects but could not find proper solution for this issue. I am expecting solutions from this group for my problem, Thanks!

[vishnunairvp]

Try deleting your derived data!

https://programmingwithswift.com/delete-derived-data-xcode/

I tried deleting derived data but it didnt solved the problem.

[vishnunairvp]

To people who face the same issue, keep only a single podfile with multiple targets (native xcode project and unity xcode project). Refer the link for example https://stackoverflow.com/a/42480097/11061458 .