Module compiled with Swift 5.1 cannot be imported by the Swift 5.1.1 compilerAsk Questions

 Posted on 10/19/2019

When building application in Xcode 11.2 beta (Swift 5.1.1) that uses framework build in Xcode 11.0 (Swift 5.1) I get an error that module compiled with 5.1 compiler cannot be imported by Swift 5.1.1 compiler. Shouldn't Swift 5.1 module stability solved this issue?

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Asked by Doug Stevenson on 10/19/2019 Score: 51 points
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Answered by hardik chaudhary on 10/21/2019 8:16:22 AM Score: 553 points

This problem is caused by the fact that you embed a pre-compiled framework. This can only be done if the swift compiler version that you use to compile your project is the same version that was used to compile that framework.

Hopefully, this restriction will be removed in future Swift / compiler versions... For more information refer to the chapter on Module Stability here:

As already mentioned in one of the comments, the solution to this problem is to up- or downgrade to the appropriate Xcode version. (Or, if possible, recompile the framework with the desired compiler version)


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Answered by Jhon Walls on 10/19/2019 10:39:26 AM Score: 64 points

Yes, assuming you have enabled the Build Libraries for Distribution (BUILD_LIBRARY_FOR_DISTRIBUTION) build setting.


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