Hello @alephao,

Thank you for restoring the Linux build!

However, I do not feel comfortable in the long term. Adding an @unchecked Sendable conformance is a quick fix, but it is unsafe, and might hide a deeper issue. We need more information:

Since I suppose one or several related issues have been opened in the Swift repository. I'd appreciate if you'd link to them here in a comment.

I'll feel more comfortable merging the PR after that.

(Please tell me if my question is not clear)

Hi @groue thanks for the quick response.

Found a few related issues, they are not related to DispatchWorkItemsFlags and DispatchQueue, but close enough: conditional Sendable conformance in the Dispatch lib.

Related issues:

• bug: DispatchSpecificKey missing conditional Sendable annotation swiftlang/swift-corelibs-libdispatch#845
• DispatchQoS and DispatchSpecificKey should have consistent Sendable conformances between macOS and linux swiftlang/swift-corelibs-libdispatch#847
• Add Sendable conformances to thread-safe types swiftlang/swift-corelibs-libdispatch#779
• And I just created this one targeting the types causing the issue here Add Sendable conformance to DispatchWorkItemsFlags and DispatchQueue swiftlang/swift-corelibs-libdispatch#910

Wow, that's perfect. Thank you very much for this investigation and for opening swiftlang/swift-corelibs-libdispatch#910 👍 I can now see that the feedback is almost inexistent, but the rationale for this PR is strong.

Merged! 👍

Oh, and thank you very much for restoring the Linux build 🙏

⛵ Shipped in v7.7.0!