Google Firebase build error for iOS from Unity - ios

Question

I recently tried to setup Google Firebase Analytics for my Unity game. I am building it for iOS exclusively. I have not been able to get Firebase working unfortunately.
I am using Xcode 8.1, OSX 10.12.1, and Unity 5.5.0f3
Whenever I try to build to iOS from Unity, I get this error in console:
Error running cocoapods. Please ensure you have at least version 1.0.0. You can install cocoapods with the Ruby gem package manager:
sudo gem install -n /usr/local/bin cocoapods
pod setup
'pod --version' returned status: 127
output:
UnityEngine.Debug:LogError(Object)
Google.IOSResolver:Log(String, Boolean, LogLevel)
Google.IOSResolver:OnPostProcessInstallPods(BuildTarget, String)
UnityEditor.HostView:OnGUI()
I have tried just about every suggestion I could find online. I have installed Cocoapods version 1.1.1, and later I tried the beta version 1.2.0.beta.1, nothing has worked.
Typing "which pod" in my terminal yields: /usr/local/bin/pod
Typing "pod --version" in my terminal yields the correct version number (i.e.: 1.2.0.beta.1)
I cannot get this build to work in my game's project, or a completely empty project to which I just imported firebase and tried to build.
I also tried to get this working with the sample project at the following link with no success: https://github.com/firebase/quickstart-unity
I am out of ideas here... can anyone help?
Much appreciated!

Answer 1

Firebase engineer here.
The code reporting the error is here:
https://github.com/googlesamples/unity-jar-resolver/blob/b7a90e43d6c893622102ca53681f53a58dab1a24/source/IOSResolver/src/IOSResolver.cs#L760
unfortunately, it looks like we're not logging the stderr stream so it's tricky to see how this is failing.
It sounds like your pod tool is returning a non-zero error code, not sure why. For example, on my machine I see the following:
$ which pod
/usr/local/bin/pod
$ pod --version ; echo $?
1.1.1
0
As you can see "pod --version" is returning "0" (success).
Similarly, pulling the latest Cocoapods tool from github https://github.com/CocoaPods/CocoaPods yields:
cd CocoaPods
export RUBYLIB=$(cd lib ; pwd)
export COCOAPODS_NO_BUNDLER=1
$ ./bin/pod --version ; echo $?
1.2.0.beta.1
0
Where the same thing is happening, the pod tool is returning a success exit code.
Things to try:
Contact support#firebase.google.com - we'll be able to work directly with you to diagnose and resolve this issue.
Try changing your LANG variable, we've been tripped up by this code https://github.com/CocoaPods/CocoaPods/blob/8db5956/bin/pod#L3 in the past. It's supposed to be handled by https://github.com/googlesamples/unity-jar-resolver/blob/b7a90e4/source/IOSResolver/src/IOSResolver.cs#L743 but you never know.
If you feel brave, build https://github.com/googlesamples/unity-jar-resolver/ yourself (you should be able to run ./gradlew in the root directory to build the DLLs) then you can add the stderr reporting, post / diagnose the error you're running into.
Cheers,
Stewart

Answer 2

If you have this error in your output:
Failed to extract git version from `git --version` ("xcrun: error: active developer path (\"/Applications/Xcode.app/Contents/Developer\") does not exist\nUse `sudo xcode-select --switch path/to/Xcode.app` to specify the Xcode that you wish to use for command line developer tools, or use `xcode-select --install` to install the standalone command line developer tools.\nSee `man xcode-select` for more details.\n") (RuntimeError),
...and IF you have a different path to XCode (like in my case, I had Xcode beta), then you should run the command:
sudo xcode-select --switch /Applications/Xcode-beta.app/