Use variable from CMAKE in C++

Question

I want to use a value declared in my CMakeLists.txt in my C++ code. I\'ve tried to do like that :

ADD_DEFINITIONS( -D_MYVAR=1 )

and

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Answer 1

add_definitions ( -DVARNAME=... )

is the correct way of using add_definitions.

To check for a constant then, use

#ifdef VARNAME
...
#endif