Proposed appoach for PR32611 output negative signs for zero

[Tim Prince]

Jerry DeLisle wrote:
> Hi All,
>
> I am proposing the following approach to this issue of printing a 
> negative sign for zero.
>
> The Fortran 77 standard explicitly prohibits printing the negative 
> sign. The F95 and F2003 standards only say that if the internal value 
> is negative a negative sign is output.
>
> I personally struggle with interpreting a zero as having a negative 
> value and so I could interpret this to mean I don't have to print a 
> negative value if I don't feel like it (liberal thinking) because zero 
> is zero.
>
> However, Metcalf, Reid, and Cohen state that the IEEE -0 is 
> "respected" for output.  So out of respect, I think I should print it.
>
> Therefore, I propose that with -std=legacy we do not print the sign, 
> otherwise we do.  This means that -std=legacy will be required to pass 
> NIST.  It also means that in this case we will not match up with g77 
> behavior without -std=legacy.
>
> Opinions please.
>
> Jerry
>
Makes sense to me.