Question

I have the following option defined in CMake:

option(OURAPP-DEV-USE_EXTREME_DEBUGGING "Use extreme debugging features" OFF)

and I would like to check in a C++ file that this option was checked (in the CMake-GUI) or not.

I.e. writing C++ code like:

#if OURAPP-DEV-USE_EXTREME_DEBUGGING
 print_extra_debugging();
#endif

Please note, that our project setup requires that there is a - between the options regarding the components (such as OURAPP and DEV and the rest …)

Any idea how to make it happen?

Answer 1

Transfer the CMake option to the C++ world using a preprocessor define.

IF(OURAPP-DEV-USE_EXTREME_DEBUGGING)
    ADD_DEFINITIONS(-DUSE_EXTREME_DEBUGGING)
ENDIF()

Under the hood, this adds the define to the compiler command line, and is then available to the preprocessor:

#ifdef USE_EXTREME_DEBUGGING
    print_extra_debugging();
#endif

Note that a hyphen is not a valid character in a C preprocessor token, so you’ll have to change the name in the define.