GNU bug report logs - #21844
`sort` behavior unstable based on neighboring elements ?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Mike Frysinger <vapier <at> gentoo.org>
To: bug-coreutils <at> gnu.org
Subject: `sort` behavior unstable based on neighboring elements ?
Date: Fri, 6 Nov 2015 11:41:41 -0500

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i got this bug report today about sort mismatches.  the order of the
inputs changes the order of the outputs which surprised me.  but it
might be a nuance of unicode collation i'm not familiar with ?

$ printf '%s\n' aarch64 abc zed | LC_ALL=nb_NO.UTF-8 sort -u
aarch64
abc
zed
$ printf '%s\n' abc aarch64 zed | LC_ALL=nb_NO.UTF-8 sort -u
abc
zed
aarch64

why aren't the outputs here the same ?  a nordic user pointed out
that aa is an alternative for å which comes after z, which is fine,
but that doesn't explain why the output isn't the same here.
-mike

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