Re: check fails on Fedora 23

On Wed, Oct 7, 2015 at 9:49 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Sun, Oct 4, 2015 at 11:52 AM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
>> Isn't this arguably a Fedora regression? What did they change in F23 to make
>> it fail? I note that F23 is still in Beta.
>
> Maybe, but it's pretty unfriendly for us to complain about a library
> issue, if it is one, by failing an Assert(). People with
> non-assert-enabled builds will just get wrong answers. Yuck.
>
> Thinking about how this could happen, I believe that one possibility
> is that there are two strings A and B and a locale L such that
> strcoll_l(A, B, L) and memcmp(strxfrm(A, L), strxfrm(B, L)) disagree
> (that is, the results are of different sign, or one is zero and the
> other is not).

I wonder if Glibc bug 18589 is relevant. Bug 18934 says "Note that
these unittests pass with glibc-2.21 but fail with 2.22 and current
git due to bug 18589 which points to a broken change in the collate
algorithm that needs to be reverted first." Hungarian is mentioned.
Doesn't Fedora 23 include glibc-2.22? Is it possible that that bug
affects strcoll but not strxfrm?

https://sourceware.org/bugzilla/show_bug.cgi?id=18589
https://sourceware.org/bugzilla/show_bug.cgi?id=18934

--
Thomas Munro
http://www.enterprisedb.com