Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
From:	"Peter Kabal" <kabal AT ECE DOT McGill DOT CA>
To:	<cygwin AT cygwin DOT com>
Subject:	Printf routine incorrectly prints NaN for -Inf
Date:	Mon, 11 Nov 2002 22:11:57 -0500
Organization:	McGill University
Message-ID:	<000301c289f9$428771f0$a82ace84@research.pc.ece.mcgill.ca>
MIME-Version:	1.0
X-Priority:	3 (Normal)
X-MSMail-Priority:	Normal
Importance:	Normal
X-MimeOLE:	Produced By Microsoft MimeOLE V6.00.2800.1106

gcc version 3.2 20020818 (prerelease)

printf ("%g", log(0));

This prints "NaN" instead of "-Inf" as it should (and did in the past).
A check of the bit pattern returned shows that that log(0) returns a bit
pattern corresponding to "-Inf", but printf prints "NaN" instead.

I am not sure which C library is being used (a bug report to gcc folks
got the response that newlib is the culprit). However, the compiler
option -print-libgcc-file-name tells me it is looking for libgcc.a. So I
am confused as to who to report the bug to.

Peter Kabal     Kabal AT ECE DOT McGill DOT CA (514) 398-7130
Electrical & Computer Engineering   (514) 398-4470 (FAX)
McGill University 
3480 University, Montreal, Quebec, Canada  H3A 2A7


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -