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[Stdlib] Special-case major version 9999 as always available. #22658

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Merged
merged 1 commit into from
Feb 18, 2019
Merged

[Stdlib] Special-case major version 9999 as always available. #22658

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3 changes: 3 additions & 0 deletions stdlib/public/core/Availability.swift
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Expand Up @@ -25,6 +25,9 @@ public func _stdlib_isOSVersionAtLeast(
_ patch: Builtin.Word
) -> Builtin.Int1 {
#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
if Int(major) == 9999 {
return true._value
}
// The call to _swift_stdlib_operatingSystemVersion is used as an indicator
// that this function was called by a compiler optimization pass. If it is
// replaced that pass needs to be updated.
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3 changes: 3 additions & 0 deletions test/stdlib/Runtime.swift.gyb
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Expand Up @@ -766,6 +766,9 @@ AvailabilityVersionsTestSuite.test("_stdlib_isOSVersionAtLeast") {
expectFalse(isAtLeastOS(1066, 0, 0))
expectTrue(isAtLeastOS(0, 1066, 0))
expectTrue(isAtLeastOS(0, 0, 1066))

// 9999 is a special version that's always available
expectTrue(isAtLeastOS(9999, 0, 0))
#endif
}

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