Bug 35867 - glibc-2.2.2 test failure while testing double (inline functions)
glibc-2.2.2 test failure while testing double (inline functions)
Status: CLOSED NOTABUG
Product: Red Hat Linux
Classification: Retired
Component: glibc (Show other bugs)
7.0
i686 Linux
high Severity medium
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Assigned To: Jakub Jelinek
Aaron Brown
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Depends On:
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Reported: 2001-04-13 05:53 EDT by additional
Modified: 2016-11-24 09:59 EST (History)
1 user (show)

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Last Closed: 2001-04-13 05:53:14 EDT
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Description additional 2001-04-13 05:53:10 EDT
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 06:02:00 EDT
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 11:53:44 EDT
Could you tell me where to find 2.2.2-10.
I tried wwwrpmfind.net and didn't find it.
Thanks for your attention!

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