[CMake] Use of CMake OPTION in code

[Pelt, R.F.P. van]

Dear all,

Recently I have added an option to a CMake project that I'm using.

For example:
OPTION(BUILD_EXTRA_STUFF "Build extra stuff." ON)

Whenever this is enables, this also changes a couple of things in 
the code, which is currently implemented with a hard define.

For example:
#define EXTRA_STUFF
#ifdef EXTRA_STUFF

Is there a way that I can 'propagate' the BUILD_EXTRA_STUFF option
to my code, so that I can implements as follows:

#ifdef BUILD_EXTRA_STUFF

Thanks for the help.

Best regards,

Roy