Swift Package Manager

[paulb777]

• Adds build support for Swift Package Manager
• Adds a GitHub Action to verify the build
• Tested in conjunction with SPM: Build and unit test RTDB firebase/firebase-ios-sdk#6022

[pwnall]

Thank you for your contribution!

I don't want this repository to grow build configurations for all major languages and package managers. So, unfortunately, I must say no to all such contributions.

I really appreciate the addition of CI coverage for the correctness of your packaging! Please consider hosting your own repository for the swift packaging! You can pull in leveldb as a git submodule.

[paulb777]

Thanks for the response. According to https://forums.swift.org/t/package-with-git-submodule-doesnt-build-correctly/27852, Swift Package Manager does not support git submodules so it looks like we'll go with a leveldb fork for Firebase and perhaps consolidate the CocoaPods leveldb support there as well.

[pwnall]

Oh I didn't realize this is for Firebase.

[MoNTE48]

@pwnall, will this someday be merged? It's just 1 swift file and it's pretty darn simple.

[paulb777]

@MoNTE48 In the meantime, Firebase is managing a leveldb fork with SPM support. See https://github.com/firebase/leveldb/tree/spm and https://github.com/firebase/firebase-ios-sdk/blob/master/Package.swift#L179