The code for this recipe is available at https://github.com/dev-cafe/cmake-cookbook/tree/v1.0/chapter-01/recipe-04 and has a C++ example. The recipe is valid with CMake version 3.5 (and higher) and has been tested on GNU/Linux, macOS, and Windows.
So far, we have looked at fairly simple projects, where the execution flow for CMake was linear: from a set of source files to a single executable, possibly via static or shared libraries. To ensure complete control over the execution flow of all the steps involved in building a project, configuration, compilation, and linkage, CMake offers its own language. In this recipe, we will explore the use of the conditional construct if-elseif-else-endif.
The CMake language is fairly large and consists of basic control constructs, CMake-specific commands, and infrastructure for modularly extending the...
