V3 PATCH: numeric_limits<> support, fix PR/3865

[Ulrich Drepper]

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Zack Weinberg wrote:

>>I suppose we could define "snan" (case insensitive) to do what we
>>want.  I'd bet that Uli would be willing to pick this up for glibc's 
>>strtod implementation.  We'd probably be "inconsistent" with other
>>libcs, but in an extremely minor way.
> 
> 
> It might make sense to permit entry of infinity and NaN as hexadecimal
> floating constants.  I could go two ways on that:

That would be good but we have a standard way of writing this for nans. 
  I'd rather see this mathod extended:

   __builtin_nan ("...")
   __builtin_qnan ("...")
   __builtin_snan ("...")
   __builtin_inf ()

This has the benefit of never going to clash with additions which might 
be added to ISO C or C++.

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