feat: add Linux x86_64 support to the prebuilt archive#20
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Build SwiftSyntax for both macOS arm64 and Linux x86_64 in CI, then package them into a single release tarball with a generated BUILD.bazel that select()s on @platforms//os + @platforms//cpu so one archive_override works for every supported platform. build.sh is split into two phases (`build` per platform, `package` once) so the workflow can fan out across heterogeneous runners and fan back in for a single release artifact.
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Summary
build.shinto two phases:build(per-platform binary build, run once perTARGET_PLATFORM) andpackage(combines staged platform tarballs into the final release archive).macos-arm64/,linux-x86_64/) of.a/.swiftinterface/.swiftdoc. The generatedBUILD.bazelusesselect()over@platforms//os+@platforms//cpuconfig_settings so a singlearchive_overrideURL works for any consumer.dry-run.ymlandbuild-publish.ymlto fan out to a macOS job + a Linux job, then fan in to a single packaging/publish job. Linux usesswift-actions/setup-swift@v2for the Swift toolchain and pulls a static buildozer release.apple/swift-syntaxcheckout'sBUILD.bazelandutils/bazel/swift_syntax_library.bzlon Linux builds to drop the@build_bazel_rules_appleload +ios_xctestrun_runner/ios_unit_testreferences that the prebuilt doesn't need.Why
Consuming the current prebuilt on a Linux Bazel build fails with
module 'SwiftSyntax' was created for incompatible target arm64-apple-macos13.0, because the.aand.swiftinterfacefiles in the archive are arm64-apple-macos only. Downstream repos that want to run their Bazel build on Blox/Linux runners have had to work around this by skipping thearchive_overrideon Linux. With per-platform artifacts, that workaround can go away.