The code for this recipe is available at https://github.com/dev-cafe/cmake-cookbook/tree/v1.0/chapter-07/recipe-03 and has a C/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 two recipes, we used macros; in this recipe, we will use a function to abstract away details and avoid code repetition. In the example, we will implement a function that accepts a list of compiler flags. The function will try to compile a test code with these flags, one by one, and return the first flag that was understood by the compiler. By doing so, we will learn a couple of new features: functions, list manipulations, string manipulations, and checking whether compiler flags are supported by the compiler.
