Unity iOS构建错误：使用Firebase Unity SDK + Google VR SDK for Unity时出现重复符号 [英] Unity iOS build error: duplicate symbols when using Firebase Unity SDK + Google VR SDK for Unity

问题描述

我正在使用 Google VR SDK for Unity 和 FirebaseMessaging.unitypackage 来开发 Unity项目 c $ c $>来自 Firebase SDK for Unity 。

Google SDK的这种组合引发了 code>错误，当我尝试为iOS构建。

---

最小，完整和可验证的例子重现错误：

要求：

• iOS设备（7.0或更高版本）


• 使用macOS的计算机


• 最新 <
  
  
  $ b
  
  
  • 有什么我们可以做的吗？
    
  • 这是一个错误，必须由Google解决？
    
    

    解决方案

    这是一个错误GVR sdk。问题是，GVR被发布，包括传递依赖，其中一些在谷歌（或别处）的其他SDK也依赖于，如firebase。由于Unity没有任何软件包管理，我们已经推出了自己的软件： -jar-resolverrel =nofollow noreferrer> https://github.com/googlesamples/unity-jar-resolver

    
    
    

    然而GVR sdk isn还没有使用它来包含它的传递依赖，所以我们得到的冲突。
    
    

    我正在做一个修复，使IOSResolver上面，在GVR中检测到这一点，剥离不应包含的对象。
    
    

    同时，您可以使用以下方法自行去除冗余对象：
    
    

    
    
    1. 在资产/插件/ iOS / libgvrunity.a中找到libgvrunity.a
       

    2. 在包含以下内容：
       
       

         set -ex 
        lipo libgvrunity.a -thin armv7 -output libgvrunity-armv7。 a 
        lipo libgvrunity.a -thin arm64 -output libgvrunity-arm64.a 
        
        ar -t libgvrunity-armv7.a | grep'GTMLogger \ | GTMSession'| xargs ar -dv libgvrunity-armv7.a 
        ar -t libgvrunity-arm64.a | grep'GTMLogger \ | GTMSession'| xargs ar -dv libgvrunity-arm64.a 
        
        lipo libgvrunity.a -replace armv7 libgvrunity-armv7.a -replace arm64 libgvrunity-arm64.a -output libgvrunity-fat.a 
        
        rm libgvrunity-armv7.a libgvrunity-arm64.a 
        
        mkdir -p备份
        mv libgvrunity.a备份
        mv libgvrunity-fat.a libgvrunity.a  
        
        
        
       再次建立并运行Unity。 
        

    


    I'm working on an Unity project where I'm using the Google VR SDK for Unity and the FirebaseMessaging.unitypackage from the Firebase SDK for Unity.

    This combination of Google SDK's throws a duplicate symbols error when I try to build for iOS.

    ---

    Minimal, Complete, and Verifiable example to reproduce the error:

    Requirements:

    • iOS device (version 7.0 or later)
    • Computer with macOS
    • Latest Unity version (5.5.2f1)
    • Latest Xcode version (8.2.1)

    Steps:

    1. Download the Google VR SDK for Unity (v1.20).
    2. Download the Firebase SDK for Unity (v3.0.0).
    3. Unzip the Firebase SDK for Unity.
    4. Open Unity and create a new project.
    5. Go to File > Build Settings... , select iOS and click on Switch Platform.
    6. Open Player Settings... and set a Bundle Identifier.
    7. Go to Assets > Import Package > Custom package... , select the GoogleVRForUnity.unitypackage and import all except the Demos folder.
    8. A Pop-Up window will appear. Select I Made a Backup, Go Ahead!.
    9. Another Pop-Up window will appear. Select Import Package and Import all.
    10. Go to Assets > Import Package > Custom package... , select the unzipped FirebaseMessaging.unitypackage and import all of it.
    11. File > Save project
    12. Connect the iOS device to the computer.
    13. File > Build & Run
    14. The Xcode build will fail because the project needs a signing with a team. Set it in your Xcode project to a valid one.
    15. Press the Xcode play button to build & run the project on your connected iOS device.

    ---

    The project build on Xcode will end with the following error:

    25 duplicate symbols for architecture arm64

    The architecture changes depending of the connected iOS device, but the error is the same.

    ---

    • Is there something that we can do?
    • Is it an error that must be resolved by Google?

    解决方案

    This is a bug in the GVR sdk. The problem is that GVR was released including the transitive dependencies, some of which other SDKs at google (or elsewhere) depend on as well, such as firebase. Since Unity doesn't have any package management for this, we've rolled our own:

    https://github.com/googlesamples/unity-jar-resolver

    However GVR sdk isn't yet using this to include its transitive dependencies and so we get the conflicts.

    I'm working on a fix that makes the IOSResolver above, detect this in GVR and strip the objects that should not be included.

    In the meantime, here's a work-around you can use to strip the redundant objects yourself:

    1. Locate: libgvrunity.a in Assets/Plugins/iOS/libgvrunity.a

    2. Create a shell script in the folder with the following contents:

       set -ex
       lipo libgvrunity.a -thin armv7 -output libgvrunity-armv7.a
       lipo libgvrunity.a -thin arm64 -output libgvrunity-arm64.a
       
       ar -t libgvrunity-armv7.a | grep 'GTMLogger\|GTMSession' | xargs ar -dv libgvrunity-armv7.a
       ar -t libgvrunity-arm64.a | grep 'GTMLogger\|GTMSession' | xargs ar -dv libgvrunity-arm64.a
       
       lipo libgvrunity.a -replace armv7 libgvrunity-armv7.a -replace arm64 libgvrunity-arm64.a -output libgvrunity-fat.a
       
       rm libgvrunity-armv7.a libgvrunity-arm64.a
       
       mkdir -p backup
       mv libgvrunity.a backup
       mv libgvrunity-fat.a libgvrunity.a

    3. Build and run from Unity again.

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