Cross-compiling - retrieve target CPU and version - cmake

Question

I'm cross-compiling for VxWorks using cmake. When I run cmake the first time I have to provide informations about compiler, target OS etc..
In the cross-compile dialogue there are three target system settings I set:
Operating System
Version
Processor
(followed by compiler etc.)
While I can retrieve the first one using CMAKE_SYSTEM_NAME, i can't get the version and the processor.
Both return an empty string.
Here's an example:
MESSAGE("CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
MESSAGE("CMAKE_SYSTEM_VERSION: ${CMAKE_SYSTEM_VERSION}")
Output:
CMAKE_SYSTEM_PROCESSOR:
CMAKE_SYSTEM_VERSION:
My Cmake Version is 2.8.10.2 and target OS is VxWorks (if this matters - compiler are WindRiver GNU).
How can I get the version and processor I've set in the beginning? Or is this impossible if I cross-compile to an OS that's unknown to cmake?
(Btw. Compiling works fine)

Answer 1

It seems this is not possible so far. I'm getting empty strings all the time.
However, there's a working solution, and i guess it's the better way:
Before:
I specified cross-compile settings (Compiler and target system, see question), then it runs over VxWorks specific parts in the CMake list (checked with if( VxWorks ) to ensure it's not executed when other systems are used).
Now (Solution):
I wrote a toolchain file and platform files for VxWorks and required processors.
Cons:
I have to write some extra files:
Toolchain file
Platform file for VxWorks
Further Platform files for each Processor (and processor type, Gnu and Diab)
Pros:
CMake list is much cleaner now
Separate Project and Target settings
Separate System and processor settings - easy to add new Processors in a very clear way but keep System settings
I write some settings in the toolchain file and CMake loads related system / processor settings
...