From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: possible issue withC formatted input/output
Date: Tue, 26 Mar 2013 08:32:00 -0000 [thread overview]
Message-ID: <20130326083235.GB16882@calimero.vinschen.de> (raw)
In-Reply-To: <5150B737.3020800@quicknet.nl>
On Mar 25 21:44, a.rburgers@quicknet.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
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Corinna Vinschen Please, send mails regarding Cygwin to
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prev parent reply other threads:[~2013-03-26 8:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-25 20:44 a.rburgers
2013-03-26 8:32 ` Corinna Vinschen [this message]
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