[CMake] Detect 32 bit build on a 64 bit system

[Clinton Stimpson]

On Tuesday 29 September 2009 11:00:56 am James Bigler wrote:
> Is it possible to detect a 32 bit build on a 64 bit system.
>
> I know I can look at the CMAKE_SIZEOF_VOIDP to determine the bitness
> of the build, but that can't tell me if I'm on a 64 bit linux system.
> Is there another mechanism?
>

Maybe execute "uname -m" and see if its "x86_64."

Clint