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From: pjh@mccc.edu (Pete Holsberg)
Newsgroups: comp.lang.c
Subject: Re: exp(anything_but_0) dumps core
Message-ID: <1991Mar24.155820.28429@mccc.edu>
Date: 24 Mar 91 15:58:20 GMT
References: <1991Mar18.211839.3010@mccc.edu> <2550162@hpisod2.cup.hp.com>
Organization: The College On The Other Side Of Route One
Lines: 42

In article <2550162@hpisod2.cup.hp.com> decot@hpisod2.cup.hp.com (Dave Decot) writes:
=> I have a program:
=> 
=> #include <stdio.h>
=> #include <math.h>
=> main()
=> {
=> 	double y;
=> 	y=exp(1.0);
=> }
=> 
=> that compiles OK but dumps core when run (the message is 'Floating
=> exception').  Running 'strings' on the binary yields:
=> 
=> @(#)/usr/ccs/lib/libm.a/exp.o.sl 1.1 5.0-3 11/05/89 65417 AT&T-SF 0.0
=> 
=> I'm using the AT&T Standard C (i.e., "ANSI C") Development Environment
=> (SCDE) 5.0/3 05/25/90 on a 6386 running AT&T UNIX System V/386 R3.2 2.2.
=> 
=> 'sum /usr/ccs/lib/libm.a' yields
=> 	17278 147 libm.a
=
=I presume that you are linking with -lm, and that a declaration of
=exp() returning double is found in <math.h>?

You presume correctly, sir!

=Are you using a "floats is floats" option to the compiler?

No idea what that means.

The AT&T HotLine folk claim that they can compile and execute that code
on a 386 with the same version of UNIX and the same SCDE.  I suppose
that means that I have a buggy libm.a, but how to get a copy of the
unbuggy one is a new question!

Pete
-- 
Prof. Peter J. Holsberg      Mercer County Community College
Voice: 609-586-4800          Engineering Technology, Computers and Math
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