bug#31318: emacs-26 fns-tests-collate-sort failure on glibc 2.27

[Paul Eggert]

On 04/30/2018 12:50 PM, Eli Zaretskii wrote:
> you are saying that 'ls' now sorts differently in UTF-8
> locales on Fedora 28?  That is, it no longer ignores punctuation in
> file names?  Doesn't that cause user outcry?

Yes, that's what I'm saying, at least for en_US.utf8. I haven't heard 
any user outcry. Not that I've been listening for one....

> This is backwards: Windows needs enu_USA, not en_US.UTF-8 (which is
> not supported on Windows).

Thanks, that was a silly typo. Revised patch attached, for the emacs-26 
branch.

> Why did they change the collation order?


To be more consistent with other platforms, as I understand it. The idea 
is to do collation consistent with ISO/IEC 14651 
<https://www.iso.org/standard/68309.html>. For more details, please see 
<https://sourceware.org/bugzilla/show_bug.cgi?id=14095>.

Regardless of whether one thinks the change was a good idea, the Emacs 
tests should be portable to any POSIX platform, and since POSIX does not 
specify how the en_US.utf8 locale works the tests should not insist on 
either the old glibc implementation or the new one.

0001-Port-collation-tests-to-glibc-2.27.patch
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