Compile against the Swift Static Linux SDK (musl) in CI - #234
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Verifies both x86_64-swift-linux-musl and aarch64-swift-linux-musl build cleanly against the official static SDK, each on a host of the matching architecture. Build-only: the static SDK's swift_static resources don't include a Testing.swiftmodule, so anything importing swift-testing (the whole test suite) cannot compile against it regardless of host/target match.
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Summary
Adds a
swift-musl.ymlworkflow that installs the official Swift Static Linux SDK and builds the package against bothx86_64-swift-linux-muslandaarch64-swift-linux-musl, each on a GitHub-hosted runner of the matching CPU architecture (ubuntu-latest/ubuntu-24.04-arm).Build-only, not test: verified locally (in the actual
swift:6.3.3-jammycontainer) that the static SDK'sswift_staticresources don't ship aTesting.swiftmodule, so anything importing swift-testing — the whole test suite — fails to compile against this SDK regardless of host/target architecture match.swift buildalone was verified to succeed for both triples.Note:
swift sdk install --checksumneeds the checksum SwiftPM itself computes for the bundle, which differs from a plainsha256sumof the downloaded file by one trailing hex digit (SwiftPM appears to use its own checksum representation, not a raw SHA256 digest) — confirmed by havingswift sdk installreport its own "Computed archive checksum" and using that value verbatim.Test plan
Linux (musl, x86_64)andLinux (musl, aarch64)jobs and passes