Bug 22336

Created attachment 10632 [details]
0001-cs_CZ-locale-Base-collation-on-iso14651_t1-BZ-22336.patch

Patch to fix the problem.

Difference in sorting of the added test file (added in the patch)
before and after applying the sorting changes of the patch:

$ diff -u cs_CZ.UTF-8.in.old cs_CZ.UTF-8.in 
--- cs_CZ.UTF-8.in.old  2017-11-24 16:47:52.688348458 +0530
+++ cs_CZ.UTF-8.in      2017-11-24 16:42:08.364221944 +0530
@@ -1,7 +1,3 @@
-ȥ
-Ȥ
-ʒ
-Ʒ
 a
 a
 a
@@ -65,7 +61,6 @@
 cenných
 cenným
 cenou
-cH
 cvrček
 cz
 cZ
@@ -94,8 +89,9 @@
 H
 hruška
 ch
-CH
+cH
 Ch
+CH
 chřestýšům
 Chřestýšům
 chřipka
@@ -188,6 +184,8 @@
 Z
 ź
 Ź
+ȥ
+Ȥ
 za
 Za
 źa
@@ -209,6 +207,8 @@
 Žb
 žluva
 Žluva
+ʒ
+Ʒ
 0
 1
 1

I think "cH" was sorted completely wrong before and "CH" slightly
wrong as well. So this patch seems to not only base the Czech
LC_COLLATE implementation on the iso14651_t1 file as requested in this
bug but also improves the sorting of the uppercase/lowercase variants
of the ch digraph.

And of course it improves the sorting of some non-Czech characters
like ʒ and ȥ because these were not handled at all in the old
Czech LC_COLLATE implementation.

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commit f9bb1ef233f7c99312ddc3efb6bc652537e077bc
Author: Mike FABIAN <mfabian@redhat.com>
Date:   Fri Nov 24 15:17:18 2017 +0530

    cs_CZ locale: Base collation on iso14651_t1 [BZ #22336]
    
    	[BZ #22336]
    	* localedata/locales/cs_CZ (LC_COLLATE): Use “copy "iso14651_t1"”
    	and implement the collation rules for cs from CLDR on top of that.
    	* Makefile: Add cs_CZ.UTF-8 to test-input and to the list
    	of locales to be built for testing.
    	* cs_CZ.UTF-8.in: New file with test data to test the Czech sorting.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

-----------------------------------------------------------------------

Summary of changes:
 localedata/Makefile       |    4 +-
 localedata/cs_CZ.UTF-8.in |  228 +++++
 localedata/locales/cs_CZ  | 2216 ++-------------------------------------------
 3 files changed, 286 insertions(+), 2162 deletions(-)
 create mode 100644 localedata/cs_CZ.UTF-8.in

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commit 22c69b6ad63dce90955d3a1d654dd152e7972fdd
Author: Mike FABIAN <mfabian@redhat.com>
Date:   Tue Nov 28 16:42:13 2017 +0100

    Add the Changelog entry for “cs_CZ locale: Base collation on iso14651_t1 [BZ #22336]”

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

Fixed in glibc master.