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10 changes: 8 additions & 2 deletions test/stdlib/Runtime.swift.gyb
Original file line number Diff line number Diff line change
Expand Up @@ -800,8 +800,14 @@ AvailabilityVersionsTestSuite.test("_stdlib_isOSVersionAtLeast") {
expectTrue(isAtLeastOS(0, 1066, 0))
expectTrue(isAtLeastOS(0, 0, 1066))

// 9999 is a special version that's always available
expectTrue(isAtLeastOS(9999, 0, 0))
// When using a runtime that's not part of the OS, 9999 is a special version
// that's always available. The _swift_classIsSwiftMask symbol is absent in OS
// libraries, so detect based on that.
let RTLD_DEFAULT = UnsafeMutableRawPointer(bitPattern: -2)
let _swift_classIsSwiftMaskPtr = dlsym(RTLD_DEFAULT, "_swift_classIsSwiftMask")
if _swift_classIsSwiftMaskPtr != nil {
expectTrue(isAtLeastOS(9999, 0, 0))
}
#endif
}

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