[CMake] config dependent defines

[Adam J Richardson]

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> Your users will hate you for that, because they will not be able to
> override the compile-flags without modifying the CMakeLists.txt file.
> 
> You can set the COMPILE_DEFINITIONS_DEBUG property on individual
> targets using SET_TARGET_PROPERTIES() or on directories with
> SET_DIRECTORY_PROPERTIES.

I've been meaning to ask, Michael. Exactly how would a user expect to
override the defaults without modifying the CMakeLists.txt file? Isn't
that the easiest way to override the defaults?

Is it because of the FORCE option they will hate him?

Regards,
Adam J Richardson
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