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Re: 961002: problem with ncdump (fwd)

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  • Subject: Re: 961002: problem with ncdump (fwd)
  • Date: Wed, 02 Oct 1996 14:57:36 -0600
>To: address@hidden
>From: Patrick Guio <address@hidden>
>Subject: problem with ncdump (fwd)
>Organization: .
>Keywords: 199610020843.AA13593

Patrick,

Oops, I didn't test that patch I sent you sufficiently.  It should be
portable, but it contains a peculiar statement that is incorrectly
compiled by several Unix systems, and incorrectly optimized by several
others:

    #define IS_FINITE(x) (((x)-(x))==((x)-(x)))

This macro works OK on AIX 4.2, HP-UX 9, SunOS 4.x, SunOS 5.x.
It works OK unless compiled with the -O flag on ULTRIX and IRIX 6.2.
It gets optimized incorrectly by default on IRIX64 and OSF1.

I'll have to keep looking for a portable way to determine whether a
number is an IEEE infinity value.

--Russ

_____________________________________________________________________

Russ Rew                                         UCAR Unidata Program
address@hidden                     http://www.unidata.ucar.edu