Resolving the “Module Compiled with Swift 5.1 Cannot Be Imported by the Swift 5.1.2 Compiler” Error

Resolving the "Module Compiled with Swift 5.1 Cannot Be Imported by the Swift 5.1.2 Compiler" Error

28 February 2025 Stephan Petzl Leave a comment Xcode

If you’ve recently upgraded to Xcode 11.2 and encountered the error message “Module compiled with Swift 5.1 cannot be imported by the Swift 5.1.2 compiler,” you’re not alone. This issue typically arises when using frameworks compiled with an earlier Swift version, such as RxSwift, which was compiled using Xcode 11.0. Here’s a detailed guide to help you resolve this problem effectively.

Understanding the Issue

The error is related to how Swift handles module stability. Swift 5.1 introduced module stability, which was supposed to eliminate the need to recompile frameworks with every new Xcode release. However, this feature requires specific settings to be enabled during the initial compilation of your framework.

Solution: Enable “Build Libraries for Distribution”

To ensure your framework can be used across different Swift compiler versions, you need to enable the “Build Libraries for Distribution” option in your framework’s build settings. Follow these steps:

  • Open your project in Xcode.
  • Navigate to the Build Settings of your framework target.
  • Find the “Build Options” section.
  • Set “Build Libraries for Distribution” to Yes.

This setting generates the necessary .swiftinterface files, allowing future Swift compilers to load your library without recompilation.

Additional Steps

If the error persists after enabling this setting, try the following:

  • Go to Product > Clean Build Folder and rebuild your project.
  • Ensure you have the latest version of any third-party libraries you are using by checking for updates.

Exploring Alternative Solutions

In some cases, using toolchains or reverting to a previous version of Xcode can resolve the issue. However, these solutions might not be practical for everyone due to project dependencies and other considerations.

Enhancing Your Testing Workflow with Repeato

As you navigate through these technical challenges, consider how tools like Repeato can streamline your development process. Repeato is a no-code test automation tool for iOS, Android, and web apps. It simplifies the creation, execution, and maintenance of automated tests using a test recorder based on computer vision and AI.

Repeato’s ability to run command line scripts or JavaScript code for complex tasks, along with support for data-driven and keyword-driven testing, makes it a versatile choice for developers. All tests and workspace data are stored in text and JSON format, facilitating easy version control.

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