[CMake] math(EXPR) and unary operators

[cowwoc]

   Apparently this issue is 3 years old:
http://public.kitware.com/Bug/view.php?id=8996

Gili


Rolf Eike Beer wrote
> 
> George Koehler wrote:
>> math(EXPR) rejects expressions with negative numbers. This is awful
>> because math() can reject its own negative results. For example, this
>> code fails:
>> 
>>   math(EXPR negative "1 - 2")
>>   math(EXPR sum "100 + ${negative}")
> 
> If you are touching this file anyway, do you see any chance of teaching it
> to 
> deal with hex numbers, too? When dealing with the OpenSSL version defines
> I 
> found out that this is currently not supported.
> 
> Eike
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