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