feat: add basic support to build frameworks and zip them for the Apple Watch

[jasesuperhero]

Fix #8731

These PRs add the ability to build frameworks using ReleaseTooling for Apple Watch. In my project I want to use Carthage as a dependency manager and by chance, I realized that the Firebase built frameworks do not support the architecture for Apple Watch.

The following changes are made in this PR:

• Added support for the Apple Watch platform and declared all necessary paths.
• Added arm64_32 architecture to build frameworks for Apple Watch device above Series 4. According to this documentation https://docs.elementscompiler.com/Platforms/Cocoa/CpuArchitectures/
• The minimal version is set as watchOS 6, according to podspecs.

As far as I understand supporting for different platforms is a part of the roadmap for the ReleaseTooling.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[jasesuperhero]

Sorry, I don't know how to add labels for the pr. Looks like I don't have such permissions

[paulb777]

Thanks for working on this @jasesuperhero!

There will also need to be updates to the platforms flag in the manifest to exclude products that aren't supported for watchos, like FirebaseDatabase and FirebaseFirestore.

[jasesuperhero]

Thanks for working on this @jasesuperhero!

There will also need to be updates to the platforms flag in the manifest to exclude products that aren't supported for watchos, like FirebaseDatabase and FirebaseFirestore.

Thanks for the quick response! Yes, of course. I'll fix the manifest to remove unsupported frameworks.

I just have one question. I see that FirebaseDatabase supports watchos, but only since version 7. Right now all other frameworks have version 6.

What is the more correct way to proceed here? Just make it unavailable for watchos according to the documentation here or set the minimum version as 7.0 and add it to the build?

[ncooke3]

What is the more correct way to proceed here? Just make it unavailable for watchos according to the documentation here or set the minimum version as 7.0 and add it to the build?

Thanks, @jasesuperhero. I think marking it unavailable is the way to go because the Database SDK's websocket implementation does not fully work on watchOS (more context in #10195 & https://github.com/firebase/firebase-ios-sdk/blob/10.23.0/FirebaseDatabase/CHANGELOG.md#1000).

[jasesuperhero]

@ncooke3 Thanks for the clarification!
Fixed all remarks!

[jasesuperhero]

@paulb777 @ncooke3 looks like the build failed.

I checked the code and changes again and realized that it may be necessary to also add s.watchos.deployment_target = '6.0' also in Firebase.podspec. According to this error in the logs:

Here is a full log.

Output from `pod install`:
Analyzing dependencies

[!] The platform of the target `FrameworkMaker` (watchOS 6.0) is not compatible with `Firebase (10.24.0)`, which does not support `watchOS`.

Also, I changed minimumWatchOSVersion to "8.0" in useRecentVersions. As I understand it, we need to use a version higher than 6.0 in case we build frameworks with the zipPods parameter

[paulb777]

Thanks, good find. The package-release job should still fail since it's building the latest release tags. package-head should succeed.

[jasesuperhero]

Ok, I think I understand the stages of the build and why it fell over last time. I also added platforms for GoogleAppMeasurement, Firebase podspecs.

[jasesuperhero]

@paulb777 Great, the PR build is green and I tested the build again locally. Watch specific binaries included in the xcframeworks.

[paulb777]

Thanks @jasesuperhero ! We appreciate the contribution. Looks good so far. We'll do a more thorough review and try to merge in for our next release.

[jasesuperhero]

Hey @paulb777! I tried testing the assembled binary on a real device and when building on the Apple Watch Ultra 2, I found that it was missing some architecture. I understand that we also need to add arm64 for watchos targeting.

So I updated that and also updated the template README.md to match all available platforms.

[paulb777]

Good spot! Have you confirmed the one of the zips built at https://github.com/firebase/firebase-ios-sdk/actions/runs/8468158559 addresses the Apple Watch Ultra 2 issue?

[jasesuperhero]

@paulb777 I haven't had time to test the built frameworks from github yet, but I've been building them locally with the latest changes. Everything works without any problems. I also tried submitting some crashes to Crashlytics and they showed up there.

[paulb777]

Thanks @jasesuperhero! I'll merge now and add a release note in a subsequent PR