TDBGen: add a workaround for a workaround for async PWT #64973
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When a protocol witness thunk is formed to a serialised protocol containing an `async` function, the async function pointer to the conformance needs to be made public due to a SIL Verifier check failure (reference to a non-fragile function from within a public fragile function). Add a stop-gap solution of rolling an extra emission for a private symbol as a public symbol to avoid the error (the underlying issue has been open for ~6y and counting as of this commit). This was identified by swift-package-manager (swiftlang#64900). Thanks to @DougGregor and @aschwaighofer for the discussion on this!
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@swift-ci please test |
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DougGregor
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Apr 7, 2023
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When a protocol witness thunk is formed to a serialised protocol containing an
asyncfunction, the async function pointer to the conformance needs to be made public due to a SIL Verifier check failure (reference to a non-fragile function from within a public fragile function). Add a stop-gap solution of rolling an extra emission for a private symbol as a public symbol to avoid the error (the underlying issue has been open for ~6y and counting as of this commit).This was identified by swift-package-manager (#64900).
Thanks to @DougGregor and @aschwaighofer for the discussion on this!
Backporting this to 5.9 to repair the SPM build. The change is pretty isolated and will add an extra item to the interface definition as per TBDGen's view to match the workaround in IRGen/SILGen related to the protocol conformance of serialised interfaces.
Cherry-pick of #64920.