libicu works in that way. There is ucol_strcoll.

http://userguide.icu-project.org/collation/api

https://github.com/unicode-org/icu

But think twice if you want to add libicu as a mandatory dependency of
coreutils. It does works at C level and widely used but it's also quite heavy.

2019-09-26 03:46 に Peng Yu さんは書きました:
If python can have pyuca that works across platform, why such thing can not
have at C level?

On Wed, Sep 25, 2019 at 12:24 PM Eric Blake <ebl...@redhat.com> wrote:

On 9/25/19 10:56 AM, Peng Yu wrote:
> I want to make my `sort` to be machine-independent and always use the
> correct Unicode sort order. Is there a way to do so?

Those two goals are somewhat at odds.  The only truly portable
machine-independent sorting is the one guaranteed by POSIX when you use LC_ALL=C (fun fact: even on an EBCDIC machine, that is required by POSIX
to collate in ASCII order, rather than native byte order).  The moment
you use any other locale, then you not only left to the mercies of
whoever wrote that locale, but also stuck with the fact that there is no
portable way to transfer locale definitions from one vendor's libc to
another.

>
> I don't know how to check where en_US.UTF-8 comes from. Do you know
> how to check it? (I use Mac OS X.)

All other locales are somewhat vendor-dependent; as you've discovered,
your vendor (Apple) has a rather gaping hole in their locale support.
But because Apple is a closed-source shop, it will have to be Apple that
fixes their bug, unless you want to take on the gargantuan task of
writing a gnulib module that provides locale tables to mirror glibc for
use on non-glibc machines.

Note that glibc doesn't have that problem, at least on my system:

$ cat /etc/fedora-release
Fedora release 30 (Thirty)
$ rpm -q glibc
glibc-2.29-22.fc30.x86_64
$ printf '%s\n' cafe caff café | LC_ALL=en_US.UTF-8  sort --debug
sort: text ordering performed using ‘en_US.UTF-8’ sorting rules
cafe
____
café
____
caff
____

So one option you could pursue is switching to an operating system that
does not curtail your freedoms.

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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