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ca48939816
The runtime that shipped with Swift 5.1 and earlier had a bug that interfered with backward deployment of binaries that dynamically check for protocol conformances on conditionally-available tests. This was fixed in the top-of-tree Swift runtime by https://github.com/apple/swift/pull/29887; however, that doesn't do much good for running binaries on older OSes that don't have that fix. In order for binaries built with a newer Swift compiler to run successfully on older OSes, introduce a compatibility hook that replaces the conformance cache implementation in the original OS runtime with a version based on the current implementation that has the fix for the protocol conformance bug. Fixes rdar://problem/59460603
28 lines
632 B
Swift
28 lines
632 B
Swift
// RUN: %target-resilience-test --backward-deployment
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// REQUIRES: executable_test
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import StdlibUnittest
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import backward_deploy_conformance
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var BackwardDeployConformanceTest = TestSuite("BackwardDeployConformance")
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public class UsesNewStruct: CustomStringConvertible {
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public var field: NewStruct<Bool>? = nil
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public let description = "This is my description"
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}
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public class OtherClass {}
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@_optimize(none)
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func blackHole<T>(_: T) {}
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BackwardDeployConformanceTest.test("ConformanceCache") {
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if getVersion() == 1 {
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blackHole(UsesNewStruct())
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}
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blackHole(OtherClass() as? CustomStringConvertible)
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}
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runAllTests()
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