[PATCH] Define iszero as a function template for C++ [BZ #20715]

[Florian Weimer]

On 10/21/2016 06:23 PM, Joseph Myers wrote:
> On Fri, 21 Oct 2016, Florian Weimer wrote:
>
>> On 10/21/2016 06:12 PM, Joseph Myers wrote:
>>> On Fri, 21 Oct 2016, Florian Weimer wrote:
>>>
>>>> Tested on x86_64, ppc64, ppc64le, s390x, aarch64.
>>>>
>>>> I'm not sure if the new test is particularly meaningful, but at least it
>>>> catches syntax errors in <math.h>.
>>>
>>> This seems fine to me (with negative zero included in the testcase),
>>
>> Oh.  How do I get a negative zero?  Would T{-0.0} be sufficient?  Or should I
>
> Yes, T{-0.0} or -T{0} should suffice.

Thanks.  Here is what I've committed.  Everything is optimized away 
anyway (but I deliberately introduced a bug to make sure the test still 
tests something).

Florian

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