[CMake] How to determine CPU features

[Alexander Tarasov]

First of all the ${CMAKE_HOST_HAS_<any_feature>} does not seem to work.

Also I've looked through the patch submitted in the context of bug 
#7273. It looks like it implements (fixes) the CPU features retrieval 
but it does not export them to the cmake user.

As far as I understand the only way to export a cmake variable is to use 
DefineProperty() method. I've looked through all properties exported and 
did not find anything related to the extended CPU features. It looks 
like that these properties have been removed or may be has not been 
implemented.

While this info is available to cmake I suppose this should be exported 
to an end-user as well. So
1) could anyone clarify the issue?
2) is it needs to be added to the bugtracker?

Best regards,
Alexander.

> This is directly related to my request Bug #7273 of two years ago to have all of this installation data "exported" as ${CMAKE_xxxxx} -- just like the OS type is exported in ${CMAKE_SYSTEM_NAME}
>
> I would suggest ${CMAKE_HOST_HAS_SSE2} , etc.
>
> Richard
>
>
> On Mar 26, 2010, at 6:23 PM, Alexander Tarasov wrote:
>
>   
>> Hi All,
>>
>> Is there a clean way to find out if host CPU supports MMX & SSE2 extensions?
>>
>> As far as I know this stuff is analyzed by cmake (am I wrong?). However I've did not find any way this info can be used in CMakeLists.txt.
>>
>> Best regards,
>> Alexander.
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