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Swift CMake Examples

This repository contains examples for using CMake to build Swift with different project layouts, including using CMake to build pure-Swift projects, and projects that use Swift-C++ interoperability.

Requirements

The projects in this repository have been tested with the 5.7.3 Linux container, as well as with the 5.7 compiler toolchain on macOS. For some of the examples with more advanced usage, you may need a newer CMake than what is shipped by the packages in your Linux distro.

  • CMake 3.22+*
  • Ninja 1.5+
  • Swift 5.7+*

* Unless noted otherwise.

These projects build with the Ninja generator (e.g cmake -G 'Ninja' ...) and likely do not work with the other generators.

Single Executable

Directory: 1_single_executable

This project demonstrates creating a simple executable written in Swift.

Executable with Library

Directory: 2_executable_library

This project demonstrates creating a single executable that links against a Swift library.

Bi-directional Swift/C++ Interop

Directory: 3_bidirectional_cxx_interop

This project demonstrates mixing Swift and C++ in a library using the Swift/C++ interoperability in Swift 5.9. Requires CMake 3.26, Swift 5.9, and Clang 11 or newer, or Apple Clang shipped in Xcode 12 or newer.

Requires:

  • CMake 3.26
  • Swift 5.9
  • Clang 11 or Apple Clang in Xcode 12 or newer

Swift Macros

Directory: 4_swift_macros

This project demonstrates how to build a custom macro in a CMake-based project using the Swift macro support introduced in Swift 5.9.

Requires:

  • Swift 5.9 (macOS: Swift 5.9.0, Windows and Linux: Swift 5.9.1)