Add swift-atomics

[clackary]

Pull Request Description

Add https://github.com/apple/swift-atomics

Acceptance Criteria

• be an Xcode or swift package manager project
• support building on either Linux or macOS
• target Linux, macOS, or iOS/tvOS/watchOS device
• be contained in a publicly accessible git repository
• maintain a project branch that builds against Swift 4.0 and passes any unit tests
• have maintainers who will commit to resolve issues in a timely manner
• be compatible with the latest GM/Beta versions of Xcode and swiftpm
• add value not already included in the suite
• be licensed with one of the following permissive licenses:
  • Apache License, version 2.0
• pass ./project_precommit_check script run

PASS: swift-atomics, 5.2, df9f81, Swift Package
========================================
Action Summary:
     Passed: 1
     Failed: 0
    XFailed: 0
    UPassed: 0
      Total: 1
========================================
Repository Summary:
      Total: 1
========================================
Result: PASS
========================================
--- swift-atomics checked successfully against Swift 5.2 ---

[clackary]

@swift-ci test

[clackary]

@lorentey FYI - Adding you as a maintainer for this! Thanks

[lorentey]

Thanks for adding this! 💯

[shahmishal]

@lorentey Have you seen this error before?

Full log: https://ci.swift.org/job/swift-PR-source-compat-suite-test-macOS/680/artifact/swift-source-compat-suite/FAIL_swift-atomics_5.2_BuildSwiftPackage.log

/Users/buildnode/jenkins/workspace/swift-PR-source-compat-suite-test-macOS/swift-source-compat-suite/project_cache/swift-atomics: warning: failed storing manifest for 'swift-atomics' in cache: unknown system error while operating on /Users/buildnode/Library/Caches/org.swift.swiftpm/manifests/manifest.db.lock

[clackary]

The previous log looks strange to me, there are a few warnings, but no real error after the swift-frontend command.

warning: failed storing manifest for 'swift-atomics' in cache: unknown system error while operating on /Users/buildnode/Library/Caches/org.swift.swiftpm/manifests/manifest.db.lock

The warning though, makes me wonder if something else caused this to fail. Going to restart testing for now...

[clackary]

@swift-ci test

[shahmishal]

The previous log looks strange to me, there are a few warnings, but no real error after the swift-frontend command.

warning: failed storing manifest for 'swift-atomics' in cache: unknown system error while operating on /Users/buildnode/Library/Caches/org.swift.swiftpm/manifests/manifest.db.lock

The warning though, makes me wonder if something else caused this to fail. Going to restart testing for now...

Looks like the same error I wrote above

[clackary]

@swift-ci test

[shahmishal]

@swift-ci test

[clackary]

@swift-ci test

[clackary]

@shahmishal I think this should be fine to merge now. The failure in PR testing is coming from swift-futures, which is also failing on the baseline, and swift-atomics built successfully.

[shahmishal]

Can you please xfail it in baseline?

[clackary]

@swift-ci test