Re: Gnuplot 4.4.2 (fixes some problems with 4.4.1)

[Tatsuro M. <tma...@ya...>]

Hello

--- Ethan Merritt  wrote:

> On Thursday 30 September 2010 04:24:36 pm Tatsuro MATSUOKA wrote:
> > Hello
> > 
> > I have tried Ethan's modification to config.dj2.
> > It seems to work fine on gnuplot 4.4.2 and 4.5.
> > 
> > Before Patch
> > gnuplot> print NaN
> >          undefined variable: NaN
> > After patch
> > gnuplot> print NaN
> > 0.0
> 
> Unfortunately, that shows isnan() is found but the initialization of
> the user variable NaN is not working correctly.
> NaN should print as "NaN" or "nan" rather than 0.0.
> 
> Could you please try this patch to see if the initialization
> method used for Microsoft C also works for DJGPP?
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> --- gnuplot-cvs/src/stdfn.c 2010-07-30 12:11:40.000000000 -0700
> +++ gnuplot-djgpp/src/stdfn.c     2010-09-30 18:12:55.000000000 -0700
> @@ -458,7 +458,7 @@
>  double
>  not_a_number(void)
>  {
> -#ifdef __MSC__
> +#if defined(__MSC__) || defined(DJGPP) || defined(__DJGPP__)
>         unsigned long lnan[2]={0xffffffff, 0x7fffffff};
>      return *( double* )lnan;
>  #else
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Ooops!

On windows version built by gcc on MinGW also gives
gnuplot> pr NaN
0.0               

I will research NaN related topic using search engine for gcc on MinGW (and) DJGPP.
After that I will consider application of the patch. 

Regards

Tatsuro


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