[m-rev.] for review: mercury implementation of string__format

[Peter Ross]

fjh wrote:
> On 22-Nov-2002, Peter Ross <pro at missioncriticalit.com> wrote:
> > > > runtime/mercury_conf.h.in:
> > > > #define for existence of ieeefp.h.
> > >
> > > It would be nice to also check for isnan() and isinf() in <math.h>,
which
> > > is where C99 puts them.
> >
> > Done.
>
> In fact, why is this code using ieeefp.h at all?
> Which system has isnan() in <ieeefp.h> but not in <math.h>?
>
My copy of cygwin says that isnan resides in "ieeefp.h".
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