Undefined symbol: _swift_stdlib_isstackallocationsafe

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When you encounter the error “undefined symbol: _swift_stdlib_isstackallocationsafe” in Swift, it typically means that there is an issue with the Swift runtime or library installation on your system. This error often occurs when there is a mismatch between the version of Swift you are using and the version of the Swift runtime/library that is available.

To resolve this issue, you can try the following steps:

  1. Check the version of Swift you are using by running the command swift --version in your terminal. Make sure it matches the version you have installed.
  2. If you have multiple versions of Swift installed, make sure you are using the correct version for your project.
  3. If you are using a package manager like Homebrew or Swift Version Manager (swiftenv), try reinstalling Swift to ensure that all necessary dependencies are correctly installed.
  4. If you are using Xcode, try updating or reinstalling Xcode to ensure that it includes the correct version of the Swift runtime/library.

Here’s an example of how you can check the version of Swift and reinstall it using Homebrew on macOS: 

$ swift --version
Swift version 5.3.2 (swiftlang-1200.0.45 clang-1200.0.32.28)

$ brew update
$ brew reinstall swift

If none of these steps resolve the issue, it may be helpful to seek assistance from the Swift community or check for any known issues related to your specific operating system or Swift version.

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