[Bug locale/18589] sort-test.sh fails at random

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

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

--- Comment #5 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Egmont Koblinger from comment #4)
> Thanks Carlos!
> 
> I wanted to investigate a bit but didn't have time, so sorry if I make wrong
> assumptions:
> 
> Does this bug result in strcoll(a, b) returning different result than
> [pseudocode] strcmp(strxfrm(a), strxfrm(b))?
> 
> I would have guessed the former is just a thin wrapper performing the
> latter; apparently it has its standalone implementation for performance
> reasons which is error prone to let the two go out of sync, am I right?
> 
> Wouldn't it make sense to extend the unittests to sort the files with both
> comparison approaches? (Although that'd still not give full protection
> against weird undiscovered corner cases where the two methods produce
> different results.)

My current analysis is that the fast-forward is wrong because it should not
fast forward into the middle of a digraph since that results in incorrect
sorting. I'm not sure why Leonhard didn't notice this.

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