Check for command line option in my header file

[greg7mdp]

Really cool, thanks a lot Jeff. 
 
I know that my CPU supports the feature, as I can test it using Visual
Studio on windows, but when I run the command you specified on Ubuntu
wunning under Virtualbox, I do not see a POPCNT definition. Is it possible
that g++ doesn't detect the feature because it is running in a virtual
machine?
 
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