Firebase Unity 2017.4.11 and XCode 10.0 Cocoapods Error

[Alex Ferrier]

I foolishly updated to XCode 10.0 (actually I didn't mean to, I failed to notice what App Store's update notification was about...), and now can't build any of our Firebase Database apps (or the database quickstart sample) using Unity 2017.4.11.

The actual error we get when building (from Unity, pre-XCodeproj) is at the footer of this email. 

I've set the DeploymentTarget for the project to higher numbers (including 9.0, 11.0 and 12.0) without success. I've also uninstalled and reinstalled cocoapods, just because when you're dealing with a complex multi-layered build system that's the expedient thing to do rather than trying to understand the issue :P 

Is this a known issue? 

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Analyzing dependencies

[!] CocoaPods could not find compatible versions for pod "GoogleUtilities/MethodSwizzler":

  In Podfile:

    Firebase/Core (= 5.6.0) was resolved to 5.6.0, which depends on

      FirebaseAnalytics (= 5.1.1) was resolved to 5.1.1, which depends on

        GoogleUtilities/MethodSwizzler (~> 5.2.0)

Specs satisfying the `GoogleUtilities/MethodSwizzler (~> 5.2.0)` dependency were found, but they required a higher minimum deployment target.

Error building Player: 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:

[Stewart Miles]

The latest version of https://cocoapods.org/pods/GoogleUtilities is 5.3.0

Prior releases are also available at https://github.com/CocoaPods/Specs/tree/master/Specs/0/8/4/GoogleUtilities

Is it possible your local Cocoapods mirror is out of date?

Could you try "pod repo update" on the command line?

Typically the iOS resolver plugin would do this for you if an error occurs while resolving pods (see https://github.com/googlesamples/unity-jar-resolver/blob/fff74e14f2d915c2cb034fbea497e8fba4bb2f2b/source/IOSResolver/src/IOSResolver.cs#L1987) so this could be a regression.

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[Alex Ferrier]

Sorry, believe that the issue is this one, discussed here: 

https://github.com/firebase/firebase-ios-sdk/issues/1845

Just found that issue. Can confirm that changing firebase dependencies to 5.9.0 gets us at least as far as a compiling XCWorkspace. 

Will read that thread, including the 5.3.1 firebase-unity release details (I'm on 5.3.0 from the public link) and follow up if I can't resolve it.