strtod ("nan") returns negative NaN

[Steven Penny]

On Tue, 14 Aug 2018 16:44:59, Eric Blake wrote:
> The remaining question is whether it should turn "-NaN" into 
> -NaN; and the argument that glibc JUST fixed their bug 23007 to make 
> strtod("-nan") return -NaN means that Cygwin should, indeed, preserve 
> the negative sign bit when parsing "-nan".
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=23007

respectfully, no, it doesnt mean that.

correct me, but Cygwin uses NewLib, not GlibC, so I would say the
"NewLib Committee" or its analog would have the say on what should happen in
this case.

Ive made my view clear already that "NaN" should never exist with a negative.
it would be equivalent to answering the question "what does blue smell like".
it just doesnt make sense.

and doing it just so that "strtod" matches "sscanf" seems like a solution going
the wrong way - we should be fixing "sscanf" to stop emitting a negative rather
than convincing "strtod" that it needs to start doing that.


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