CMake Cookbook

Getting ready

We will need two source files, both very similar to the previous recipe. One will be configured with the recorded hash (version.hpp.in), as follows:

#pragma once  #include <string>const std::string GIT_HASH = "@GIT_HASH@";

We will also need an example source file (example.cpp), which will print the hash to the screen:

#include "version.hpp"#include <iostream>int main() {  std::cout << "This code has been configured from version " << GIT_HASH            << std::endl;}

This recipe also assumes that we are in a Git repository with at least one commit. So, initialize this example with git init, and create commits with git add <filename>, followed by git commit, in order to get a meaningful example.