X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; q=dns; s=
	default; b=a/HlwAxoqb2ZOP4TCHBWMyVBJbHF4E8CCfXViu3VYBdAQUieHdaeI
	ZOpiMSnEe9ynyyJMrCYP+Tsie5vebRDJybmE1GiK/GUpbvHHFieSFTXHkcsO0eE5
	6DQTZDkqM3syRvzaVglCCB0mtdqjzLSiJCTRkrziNz15bQKFCxJXcs=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; s=default;
	bh=3EuGfnN/ZcNXLVmD45eTc6tljzo=; b=CUZqTLKRNJxO6M1U+vLiwFwuUcd8
	SPbvriSozieDQFR2lhG2loOxXtNoMoacT+cqmM5oTbur1YfmJU8l4ycnRsQ8fjlT
	ywP5o4WYsPqC+BSyd0X16itFSCBx7nHROqzPZmF4Z9xlnt4pWx/DLDl5vv5vMscM
	NrkOrMj2bAx9Fsc=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/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
X-Spam-SWARE-Status:	No, score=-1.9 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.1
Date:	Tue, 26 Mar 2013 09:32:35 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: possible issue withC formatted input/output
Message-ID:	<20130326083235.GB16882@calimero.vinschen.de>
Reply-To:	cygwin AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
References:	<5150B737 DOT 3020800 AT quicknet DOT nl>
MIME-Version:	1.0
In-Reply-To:	<5150B737.3020800@quicknet.nl>
User-Agent:	Mutt/1.5.21 (2010-09-15)

On Mar 25 21:44, a DOT rburgers AT quicknet DOT nl wrote:
> While preparing gsl packages, one of the check fails.
> The failure is reproduced by attached .c file, which writes
> doubles to a file, and reads them back.
> 
> On linux this is the output (all zero differences in the last column).
> 
> ivals[0]=1: 0.002518891687657430663 0.002518891687657430663 0
> ivals[1]=6: 0.01511335012594458398 0.01511335012594458398 0
> ivals[2]=41: 0.1032745591939546598 0.1032745591939546598 0
> ivals[3]=45: 0.113350125944584379 0.113350125944584379 0
> ivals[4]=46: 0.1158690176322418192 0.1158690176322418192 0
> dawn.ad.intra{~/tmp }75: uname -a
> Linux dawn.ad.intra 2.6.9-89.31.1.ELsmp #1 SMP Mon Oct 4 21:41:59
> EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
> 
> on cygwin (both 32 and 64 bit):
> 
> $ ./tst
> ivals[0]=1: 0.002518891687657430663 0.002518891687657430663 0
> ivals[1]=6: 0.01511335012594458398 0.01511335012594458224 1.7347e-18
> ivals[2]=41: 0.1032745591939546598 0.1032745591939546459 1.3878e-17
> ivals[3]=45: 0.113350125944584379 0.1133501259445843651 1.3878e-17
> ivals[4]=46: 0.1158690176322418192 0.1158690176322418053 1.3878e-17
> 
> the gsl test expects 0 differences and reports a fail.
> I am not sure whether this is a bug.  Maybe something with
> extended precision registers, when I wild guess.

Thanks for the testcase.  This problem has been introduced in newlib a
while back and made it into 1.7.17, unfortunately.  However, it's fixed
in the latest snapshots from http://cygwin.com/snapshots/ and will be in
1.7.18.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -