This program demonstrates using CMake to build a Swift executable that uses a Swift library.

$ mkdir build && cd build
$ cmake -G 'Ninja' ../
$ ninja factorials
$ ./src/factorials

factorial(0) = 1
factorial(1) = 1
factorial(2) = 2
factorial(3) = 6
factorial(4) = 24
factorial(5) = 120
factorial(6) = 720
factorial(7) = 5040
factorial(8) = 40320
factorial(9) = 362880
factorial(10) = 3628800

This project results in two primary build products, the factorial library, and the factorials executable The library and the corresponding swiftmodule live under the lib/ directory, while the executable lives under the src/ directory.