Compatibility51: Backport the 5.2 implementation of the conformance cache. #31256
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mikeash
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Apr 24, 2020
…ache. 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 swiftlang#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
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mikeash
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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 #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