[patch,fortran] PRs 19363 and 19691, Cygwin failure in formatted write of Inf and NaN

[Steve Kargl]

On Mon, Jan 31, 2005 at 11:51:38PM +0100, Steven Bosscher wrote:
> On Monday 31 January 2005 23:45, Steve Kargl wrote:
> > How do you fix configure?  AFAIK, configure only
> > compiles a test code to ensure that math.h defines
> > isfinite().  It does not actually test to see if
> > isfinite() actually works.  isfinite() is defined
> > on Cygwin, but it does not work.
> 
> Then you add a check to see if it works.  libstdc++ has
> a check for it iirc.
> 

troutmask:sgk[211] pwd 
/usr/tmp/sgk/gcc/libstdc++-v3
troutmask:sgk[212] grep isfinite configure
isfinite(0.0);

This does not test whether isfinite works when the
number is NaN or Inf.  I'll also suggest that 0.0
may be a bad choice for the the value to test.

See http://gcc.gnu.org/ml/fortran/2005-01/msg00092.html

-- 
Steve