Executing custom tasks at build time

The most generic way to add a custom task is by creating a custom target that executes an external task as a sequence of commands. Custom targets are handled like any other library or executable target, with the difference that they do not invoke the compiler and linker; instead, they do something defined by the user. Custom targets are defined using the add_custom_target command:

add_custom_target(Name [ALL] [command1 [args1...]]
                  [COMMAND command2 [args2...] ...]
                  [DEPENDS depend depend depend ... ]
                  [BYPRODUCTS [files...]]
                 ...