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Re: isnan in fortran


From: John W. Eaton
Subject: Re: isnan in fortran
Date: Wed, 11 Apr 2012 07:11:12 -0400

On 11-Apr-2012, c. wrote:

| 
| On 10 Apr 2012, at 19:00, address@hidden wrote:
| 
| > I think it would be better to rename the files that need this
| > treatment to FILE.in.f and then use sed to do the transformation to
| > generate FILE.f in the build tree.
| > 
| > jwe
| 
| I am preparing a patch to do that.

After giving it some more thought, it might be better in this specific
case to have a configure test that checks whether isnan is available
in Fortran and if not, adds misc/isnan.f to the list of functions to
compile.  The misc/isnan.f function could be

      logical function isnan (x)
      double precision x
      if (x != x)
        isnan = .false.
      else
        isnan = .true.
      endif
      return
      end

jwe




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