Doug Gregor a6c88ee52c Disable availability checking when type-checking the _Concurrency interface ...

Swift 5.5 didn't support back deployment of concurrency features, so a
Swift 5.5 compiler processing the _Concurrency .swiftinterface will
produce errors for each `async` function and actor with pre-macOS
12/iOS 15 availability. Emit `-disable-availability-checking` into the
generated `.swiftinterface` files to allow Swift 5.5 to continue to
build them.

Finishes rdar://82602353.

2021-09-02 12:56:20 -07:00

82 KiB

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