Build and test on native ubuntu-24.04-arm - #233
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Mirrors the existing x86_64 Linux job's matrix (Swift 6.2.3/6.3.3, debug/release, static/dynamic) on GitHub's hosted ARM64 runner, using the same official multi-arch Swift container images. Unlike swift-arm.yml's armv6/armv7 jobs, this is a real 64-bit ARM machine rather than a cross-compilation target, so it builds and runs the full test suite directly.
Same jobs, same coverage — arch is now a matrix dimension instead of a separate duplicated job, with an include block supplying the matching runner label per architecture.
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unsafeBitCast between UInt128 and its 16-byte tuple representation assumes compatible alignment, but UInt128 is naturally 16-byte aligned while a tuple of UInt8 is 1-byte aligned. withUnsafeBytes plus loadUnaligned make no such assumption. This is a correctness cleanup, not a fix for the arm64 crash in HCILEPrivacyTests — that crash reproduces unchanged with this applied, so its cause lies elsewhere.
A single failing cell was cancelling the rest mid-compile, which hides exactly the arch/toolchain/config breakdown needed to diagnose a platform-specific failure.
They witnessed `async throws` protocol requirements with synchronous `throws` methods, so every call went through a compiler-generated thunk. Diagnostic for the arm64 debug crash in HCILEPrivacyTests: if the thunk is where a 16-byte-aligned parameter struct gets mislaid, removing it should make the crash go away.
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Summary
Adds a
linux-arm64job toswift.yml, mirroring the existinglinuxjob's matrix (Swift 6.2.3/6.3.3, debug/release, static/dynamic) on GitHub's hostedubuntu-24.04-armrunner.This is distinct from
swift-arm.yml's existing armv6/armv7 jobs, which cross-compile on x86_64 runners because those 32-bit ARM targets have no hosted execution environment.ubuntu-24.04-armis a real 64-bit ARM machine, so this job builds and runs the full test suite natively, using the same official multi-arch Swift container images the x86_64 job already uses (Docker pulls the arm64 variant automatically).Test plan
Linux (ARM64)matrix and passes