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Enable Swift 6 mode unless we are in a self-hosted Swift CI job #2621

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Merged
merged 1 commit into from
Apr 25, 2024
Merged

Enable Swift 6 mode unless we are in a self-hosted Swift CI job #2621

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7 changes: 6 additions & 1 deletion Package.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -298,7 +298,12 @@ let package = Package(
exclude: ["Inputs"]
),
],
swiftLanguageVersions: [.v5]
// Disable Swift 6 mode when the `SWIFTSYNTAX_DISABLE_SWIFT_6_MODE` environment variable is set. This works around the following
// issue: The self-hosted SwiftPM job has Xcode 15.3 (Swift 5.10) installed and builds a Swift 6 SwiftPM from source.
// It then tries to build itself as a fat binary using the just-built Swift 6 SwiftPM, which uses xcbuild from Xcode
// as the build system. But the xcbuild in the installed Xcode is too old and doesn't know about Swift 6 mode, so it
// fails with: SWIFT_VERSION '6' is unsupported, supported versions are: 4.0, 4.2, 5.0 (rdar://126952308)
swiftLanguageVersions: hasEnvironmentVariable("SWIFTSYNTAX_DISABLE_SWIFT_6_MODE") ? [.v5] : [.v5, .version("6")]
)

// This is a fake target that depends on all targets in the package.
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