The code for this recipe is available at https://github.com/dev-cafe/cmake-cookbook/tree/v1.0/chapter-02/recipe-05 and has a C++ example. The recipe is valid with CMake version 3.10 (and higher) and has been tested on GNU/Linux, macOS, and Windows.
In this recipe, we will discuss how to discover the host processor instruction set with the help of CMake. This functionality has been added to CMake relatively recently and requires CMake 3.10 or later. The detected host system information can be used to either set corresponding compiler flags or to implement optional compilation of sources or source code generation depending on the host system. In this recipe, our goal will be to detect the host system information, pass it to the C++ source code using preprocessor definitions, and print the information to the output.
