The code for this recipe is available at https://github.com/dev-cafe/cmake-cookbook/tree/v1.0/chapter-02/recipe-03 and has a C++ and a Fortran example. The recipe is valid with CMake version 3.5 (and higher) and has been tested on GNU/Linux, macOS, and Windows.
This recipe is similar to the previous one in the sense that we will use CMake to accommodate the compilation of conditional source code that is dependent on the environment: in this case, it will be dependent on the chosen compiler. Again, for the sake of portability, this is a situation that we try to avoid when writing new code, but it is also a situation that we are almost guaranteed to meet sooner or later, especially when using legacy ...
