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Getting CMake

CMake 3.5 is the minimum required version of CMake for this book. Only a few, specific recipes and examples that demonstrate useful features that were introduced after version 3.5 will require a more recent version of CMake. The introduction to every recipe features an info box, pointing out where the code is available, which examples are given, and the minimum version of CMake required. The info boxes will look like the following box:

The code for this recipe is available at https://github.com/dev-cafe/cmake-cookbook/tree/v1.0/chapter-03/recipe-10, and includes a C example. The recipe is valid with CMake version 3.5 (and higher) and has been tested on GNU/Linux, macOS, and Windows.

Some, if not most, of the recipes will still be valid with older versions of CMake. However, we have made no attempts to test this assumption, since we consider CMake 3.5 to be the default on most systems and distributions. We also consider upgrading to later versions of CMake to be a straightforward step.

CMake can be installed in a number of different ways. Downloading and extracting the binary distribution maintained by Kitware will work across all platforms. The download page is at https://cmake.org/download/.

Most GNU/Linux distributions have CMake available in their package managers. However, on some distributions, the packaged version can be rather old, so downloading the binary maintained by Kitware is still the preferred option. The following commands will download and install CMake 3.5.2 under $HOME/Deps/cmake (adjust this path to your preference), from the version packaged by CMake:

$ cmake_version="3.5.2"
$ target_path=$HOME/Deps/cmake/${cmake_version}
$ cmake_url="https://cmake.org/files/v${cmake_version%.*}/cmake-${cmake_version}-Linux-x86_64.tar.gz"
$ mkdir -p "${target_path}"
$ curl -Ls "${cmake_url}" | tar -xz -C "${target_path}" --strip-components=1
$ export PATH=$HOME/Deps/cmake/${cmake_version}/bin${PATH:+:$PATH}
$ cmake --version

Homebrew for macOS reliably ships the latest version of CMake:

$ brew upgrade cmake

On Windows, you can use Visual Studio 2017, which provides CMake support. The installation of Visual Studio 2017 is documented in Chapter 13, Alternative Generators and Cross-compilation, Recipe 1, Building a CMake project using Visual Studio 2017.

Alternatively, you can download the MSYS2 installer from https://www.msys2.org , follow the instructions given therein to update the list of packages, and then install CMake using the package manager, pacman. The following code assumes that we are building the 64-bit version:

$ pacman -S mingw64/mingw-w64-x86_64-cmake

For the 32-bit version, use the following (though we will only refer to 64-bit versions in future, for the sake of brevity):

$ pacman -S mingw64/mingw-w64-i686-cmake

Another nice feature of MSYS2 is that it provides a terminal on Windows that feels and behaves like a terminal on a Unix-like operating system, providing a useful development environment.