Module compiled with Swift 3.1 cannot be imported in Swift 4.0

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greenpanda OP

Created Jun ’17

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After updating to Xcode 9, I loaded and tried to build my project, which failed.

I use the AwesomeCache, through Carthage and I have a compiler error while importing the .framework.

import AwesomeCache ❌ Module compiled with Swift 3.1 cannot be imported in Swift 4.0

In my target's build settings, the Swift language version is set to Swift 3.2.

Do I need to wait for AwesomeCache to update their library or is there any other way to use Swift 3.1 in Xcode 9 beta?

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Answer 1

QuinceyMorris OP

Jun ’17

Yes, you'll have to wait, or you'll have to rebuild the framework yourself from source. If it's open source, rebuilding in 3.2 mode should be pretty much problem-free.

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Answer 2

KMT OP

Jun ’17

The difference between 3.1 & 3.2 is enough to throw up a roadblock. Anything you can do to move your code to at least 3.2 will make your life easier.

From the docs:

Version Compatibility

This book describes Swift 4.0, which is the default version of Swift included in Xcode 9. You can use Xcode 9 to build targets that are written in either Swift 4 or Swift 3.

NOTE

When the Swift 4 compiler is working with Swift 3 code, it identifies its language version as 3.2—this means you can use conditional compilation blocks like

#if swift(>=3.2)

to write code that is compatible with multiple versions of the Swift compiler.

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