概要

iOS framework addition failed due to a CocoaPods installation failure. This will will likely result in an non-functional Xcode project.

After the failure, "pod repo update" was executed and succeeded. "pod install" was then attempted again, and still failed. This may be due to a broken CocoaPods installation. See: https://guides.cocoapods.org/using/troubleshooting.html for potential solutions.

pod install output:

Analyzing dependencies
[!] `FirebaseABTesting` requires CocoaPods version `>= 1.12.0`, which is not satisfied by your current version, `1.11.3`.

Ignoring ffi-1.15.5 because its extensions are not built. Try: gem pristine ffi --version 1.15.5
Ignoring json-1.8.6 because its extensions are not built. Try: gem pristine json --version 1.8.6
...

pod repo update output:

Updating spec repo `cocoapods`
Updating spec repo `trunk`

CocoaPods 1.15.0 is available.
To update use: `sudo gem install cocoapods`

For more information, see https://blog.cocoapods.org and the CHANGELOG for this version at https://github.com/CocoaPods/CocoaPods/releases/tag/1.15.0

Ignoring ffi-1.15.5 because its extensions are not built. Try: gem pristine ffi --version 1.15.5
Ignoring json-1.8.6 because its extensions are not built. Try: gem pristine json --version 1.8.6
...

UnityEngine.Debug:LogError (object)
Google.Logger:Log (string,Google.LogLevel) (at Z:/tmp/tmp.K9OFax9s5i/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/Logger.cs:136)
Google.IOSResolver:Log (string,bool,Google.LogLevel) (at Z:/tmp/tmp.UswgKsehZ1/third_party/unity/unity_jar_resolver/source/IOSResolver/src/IOSResolver.cs:1243)
Google.IOSResolver:OnPostProcessInstallPods (UnityEditor.BuildTarget,string) (at Z:/tmp/tmp.UswgKsehZ1/third_party/unity/unity_jar_<message truncated>

Firebase を導入している Unity プロジェクトで iOS ビルドしたら
上記のエラーが発生してビルドに失敗するようになった

Xcode 15.2 をインストールしてからか、
Firebase のパッチバージョンをアップデートしてからエラーが出るようになった

CocoaPods 周りに問題があるようだったので

gem install cocoapods

ターミナルで上記のコマンドを実行したら

baba-s@babashoutamacbookpro ~ % gem install cocoapods
Ignoring ffi-1.15.5 because its extensions are not built. Try: gem pristine ffi --version 1.15.5
Ignoring json-1.8.6 because its extensions are not built. Try: gem pristine json --version 1.8.6
Fetching cocoapods-1.15.2.gem
Fetching cocoapods-core-1.15.2.gem
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.

上記のエラーが出た

sudo gem install cocoapods

sudo を付けてコマンドを実行したら

Ignoring ffi-1.15.5 because its extensions are not built. Try: gem pristine ffi --version 1.15.5
Ignoring json-1.8.6 because its extensions are not built. Try: gem pristine json --version 1.8.6
Successfully installed cocoapods-core-1.15.2
Successfully installed cocoapods-1.15.2
Parsing documentation for cocoapods-core-1.15.2
Installing ri documentation for cocoapods-core-1.15.2
Parsing documentation for cocoapods-1.15.2
Installing ri documentation for cocoapods-1.15.2
Done installing documentation for cocoapods-core, cocoapods after 2 seconds
2 gems installed

成功した

その後に Unity プロジェクトで iOS ビルドしたら正常に完了した