Zachary 'Clack' Cole

Linux build failure -- error: cannot inherit from class 'NSLock' (compiled with Swift 6.0) because it has overridable members that could not be loaded in Swift 5.10

9

**Short description of the issue**: RxSwift fails to build on Ubuntu 22.04 against 2024-07-22 nightly Swift toolchains (and newer). **Expected outcome**: Top of RxSwift main (also reproduced with 6.5.0) builds...

(Linux) Build failure against 2024-09-25 nightly toolchain -- error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 5.10

2

This one is another instance of a swiftlang compiler bug I've been running into for a while: https://github.com/swiftlang/swift-corelibs-foundation/issues/5108 ``` root@7481e59c0960:/project/opentelemetry-swift# /home/dev-toolchain/swift-DEVELOPMENT-SNAPSHOT-2024-09-25-a-ubuntu22.04-aarch64/usr/bin/swift build ... /project/opentelemetry-swift/Sources/OpenTelemetrySdk/Logs/Processors/BatchLogRecordProcessor.swift:41:15: error: cannot inherit from class 'Thread'...

[6.1] Explicitly use minimal type expansion for autodiff-related types

4

- **Explanation**: As autodiff happens on function types it is not in general possible to determine the real expansion context of the function being differentiated. Use of minimal context is...

[6.1] [AutoDiff] Peel off @sendable implicit conversion when checking for unsupported differentiable function conversion

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- **Explanation**: Peel off @sendable implicit conversion when checking for unsupported differentiable function conversion - **Scope**: Only affects autodiff code. - **Issues**: N/A - **Original PRs**: https://github.com/swiftlang/swift/pull/77869 - **Risk**: Low....

[6.1] Emit reabstraction thunks for implicit conversions between T.TangentType and Optional<T>.TangentType

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- **Explanation**: Emit reabstraction thunks for implicit conversions between T.TangentType and Optional.TangentType. Resolves a crash from silgen, producing a diagnostic instead. - **Scope**: Affects primarily autodiff code. - **Issues**: https://github.com/swiftlang/swift/issues/77871...

Plugin build fails with `error: buildFailed` when benchmarking with a recent main-snapshot toolchain

2

We've working on mainlining some optimizations to Swift. I'm trying to run benchmarks on an internal project using a toolchain with the optimizations and without to measure the performance impact....