CMake Cookbook

How to do it

This is a step-by-step breakdown of our three CMake files:

1. In this recipe, we will not compile any code and our language requirement is therefore NONE:

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)  project(recipe-05 LANGUAGES NONE)

2. We then define an include_guard macro, which we place in a separate module:

# (re)defines include_guardinclude(cmake/include_guard.cmake)

3. The cmake/include_guard.cmake file contains the following (we will discuss it in detail shortly):

macro(include_guard)  if (CMAKE_VERSION VERSION_LESS "3.10")    # for CMake below 3.10 we define our    # own include_guard(GLOBAL)    message(STATUS "calling our custom include_guard")    # if this macro is called the first time    # we start with an empty list if(NOT DEFINED ...