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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