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Bug 35867

Summary:	glibc-2.2.2 test failure while testing double (inline functions)
Product:	[Retired] Red Hat Linux	Reporter:	additional
Component:	glibc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED NOTABUG	QA Contact:	Aaron Brown <abrown>
Severity:	medium	Docs Contact:
Priority:	high
Version:	7.0	CC:	fweimer
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2001-04-13 09:53:14 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description additional 2001-04-13 09:53:10 UTC

I downloaded the latest glibc (2.2.2) and corresponding linuxthreads from 
ftp.gnu.org. When I finally built it and ran "make check" the following 
error occured:

testing double (inline functions)
Failure: Test: yn (3, 0.7) == -15.819479052819633505
Result:
 is:         -1.58194790528196396195e+01  -0x1.fa392c2273c1d0000000p+3
 should be:  -1.58194790528196342905e+01  -0x1.fa392c2273c1a0000000p+3
 difference:  5.32907051820075139403e-15   0x1.80000000000000000000p-48
 ulp       :  3.0000
 max.ulp   :  2.0000

Test suite completed:
  2419 test cases plus 2211 tests for exception flags executed.
  1 errors occurred.

This failure occured on i686 with RedHat 7.0, kernel-2.4.3, gcc-2.96-79, 
make-3.79.1, perl-5.6.0-9, binutils-2.10.1

How severe is it? Can I use the built library? And how to fix it?

Comment 1 Jakub Jelinek 2001-04-13 10:02:00 UTC

It does not happen in the glibc we ship (2.2.2-10) AFAIK.
Anyway, it is not something you should be thrilled about too much,
yn was not precise too much (2 units within last place) and the glibc
you were testing had the difference 3 units.
In glibc-2.2.3 (currently there is 2.3.3pre3) much of the double math
library has been rewritten, so it guarantees accurracy even in
the last bit.

Comment 2 additional 2001-04-13 15:53:44 UTC

Could you tell me where to find 2.2.2-10.
I tried wwwrpmfind.net and didn't find it.
Thanks for your attention!