[CMake] Accessing Variables from within a *.cmake file

[Hashim Mir]

Hi,

I am trying to control the flow of my program based on the value of a cmake variable called CMAKE_SIZEOF_VOID_P.

To start off, I wanted to just see what value this variable took under multiple different configurations, by issuing the following command in my cmakelists.txt file:

message(${CMAKE_SIZEOF_VOID_P})

This works perfectly. However, whenever I try to run the above command on my *.cmake file, I get no value returned to me (it just throws an error).

It is important that I am able to access the value of this variable in my *.cmake file, as that will help me decide what flags and other parameters to pass in to the compiler. All I really need is a way to determine whether cmake is running a x64 compile or a 32 bit compile, so if there is any other variable (other than this one, since it is not defined in *.cmake files) that will give me this, then that would also work for my purposes.

Any help would greatly be appreciated.

Thanks,
Hashim

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