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From: robert@gitpyr.UUCP (Robert Viduya)
Newsgroups: net.micro.att
Subject: Re: What's wrong with this program (3b2)?
Message-ID: <476@gitpyr.UUCP>
Date: Sun, 16-Jun-85 09:17:10 EDT
Article-I.D.: gitpyr.476
Posted: Sun Jun 16 09:17:10 1985
Date-Received: Mon, 17-Jun-85 04:30:38 EDT
References: <104@gwsd.UUCP>
Organization: Georgia Tech, Atlanta
Lines: 32

>
> The following program came out of the K&R book, page 8.
> When compiled on a 3b2 (SYS-V.2)...
> 
> $ cc -g temperature.c
> $ a.out
> Illegal instruction - core dumped
> $ sdb a.out
> main:15:     fahr = lower;
> *q
> 

The problem isn't in the the program.  Basically, the 3B2 (or as I understand
it, the old 3B2) doesn't have hardware floating point.  If you notice, the
program died at the point where the first floating point variable was
referenced.  The C compiler doesn't know about the missing hardware and gen-
erates floating point instructions which the machine promptly pukes on.
There's an undocumented flag for the cc command which enables generation
of software floating point support.  Simply change your cc command line to:

	$ cc -g -f temperature.c

and everything should work fine.


			robert
-- 
Robert Viduya							01111000
Georgia Institute of Technology

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