[Bug libstdc++/58625] std::signbit always converts to double

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58625

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-10-04
     Ever confirmed|0                           |1

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Well, now I see this can be certainly a correctness issue, for eg very small
negative long doubles. Thus I think we should certainly do the change anyway
for 4.9. For c_std I'm afraid we have to add overloads (I think, essentially
copy over the corresponding bits of c_global without constexpr). Can you send a
patch to the libstdc++-v3 mailing list? And, please, double check isnan and
isinf. Thanks!