The code for this recipe is available at https://github.com/dev-cafe/cmake-cookbook/tree/v1.0/chapter-06/recipe-07, including a C++ example. The recipe is valid with CMake version 3.5 (and higher), and has been tested on GNU/Linux, macOS, and Windows.
In the previous recipe, we recorded the state of the code repository (Git hash) at configure time, and it is very useful to have the state of the repository recorded in the executable. However, one unsatisfactory aspect of the previous approach is that if we changed branches or committed changes after having configured the code, the version record included in our source code could point to the wrong Git hash. In this recipe, we wish to go a step further and demonstrate how to record the Git hash (or, generally, perform other actions) at build time, to make sure that these actions are run every...
