Re: [PATCH v4 0/3] C.UTF-8

[Carlos O'Donell via Libc-alpha <libc-alpha@sourceware.org>]

On 7/29/21 3:53 AM, Florian Weimer wrote:
> * Carlos O'Donell via Libc-alpha:
> 
>> The following changes implement a minimally sized C.UTF-8.
>> First we implement the 'strcmp_collation' directive.
>> Then we implement C.UTF-8 with an LC_COLLATE that uses the
>> 'strcmp_collation' directive to support using strcmp for
>> collation i.e. code point sorting. The final C.UTF-8 is
>> only ~396KiB with the largest ~346KiB in LC_CTYPE for all
>> of Unicode.
>>
>> This v4 fixes the regressions detected in Fedora Rawhide
>> here: https://bugzilla.redhat.com/show_bug.cgi?id=1986421
>> Additional testing coverage is provided for fnmatch, regcomp,
>> and regexec (which would have caught the regression).
> 
> From a high-level point of view I wonder if the more conservative choice
> would be to fix the localdef generation for LC_COLLATE, at least for
> this release.  It would also mean that we do not break statically linked
> executables.

That is a great idea. In fact it's actually fairly easy to split and
reuse the tables from C-collate.c in ld-collate.c and emit them when
you have a nrules == 0 scenario and thus provide support in fnmatch,
regexec, and regcomp for ASCII ranges.

I've finished a new v5 along these lines and I'm testing it right now.

-- 
Cheers,
Carlos.