[CMake] CMAKE_SYSTEM_NAME Returning Blank??

[Pettey . Lucas]

Hello,

I am trying to set some default variables based on the platform being used. I am trying the following syntax:

IF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
    # Mac OS X specific code
    SET(OperatingSystem "Mac OS X")
    message(STATUS "WORKS OK")
    IF(${CMAKE_SYSTEM_PROCESSOR } MATCHES "Intel")
        # Intel Mac OS X specific code
        SET(Processor "Intel")
        message(status "Works even better")
    ENDIF(${CMAKE_SYSTEM_PROCESSOR } MATCHES "Intel")

ENDIF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")

But on a Mac OS X system with an Intel processor, I am not receiving any messages. In fact, CMAKE_SYSTEM_NAME and CMAKE_SYSTEM_PROCESSOR appear to be blank on my mac and the UNIX cluster I tried them on. Am I missing a crucial step in determining the platform?

Thanks,
Lucas
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