How can Cmake describe non-source dependency and post-copy?

Question

CMake

There is a configuration file (not the source) of a part of the project, when it is changed, it is necessary to run a Python script that regenerates the sources.
How to describe? But so that only when changing the configuration file.
How to run python script after linking?

Answer 1

You will most likely be helped by add_custom_command with the OUTPUT and DEPENDS options.
Example:

add_executable(
    my_target
    path/to/generated/file_1
    path/to/generated/file_2
)

add_custom_command(
    OUTPUT # Файлы, которые генерируем
        path/to/generated/file_1
        path/to/generated/file_2
    COMMAND # Команда генерации
        python generate.py
    DEPENDS # Файл конфига (CMake должен сам отслеживать изменения этого файла и вызывать COMMAND если это необходимо)
        path/to/config.cfg
)