Michael Paquier wrote, On 2015-03-25 04:26:
> copysign is not that portable, at least it is not in the MSVC world.
> So as a patch you would get something like the attached with what you
> wrote.
The only point of using copysign there was to deal with a negative zero
corner case. The attached removes copysign from the test program too,
relying instead on sprintf outputting the sign of minus zero when available.
