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Message-ID:	<643c1cb7-9b18-25cf-62b0-8085c8fab137@Shaw.ca>
Date:	Wed, 24 Nov 2021 11:01:46 -0700
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Subject:	Re: raise(-1) has stopped returning an error recently
To:	cygwin AT cygwin DOT com
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	<YZtwMZ1LUbx+b5+s AT calimero DOT vinschen DOT de>
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From:	Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Brian Inglis <Brian DOT Inglis AT Shaw DOT ca>
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This is a multi-part message in MIME format.
--------------zNrXg9ByJ32umLoTUxW54trQ
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Content-Transfer-Encoding: 7bit

On 2021-11-24 02:25, Corinna Vinschen via Cygwin wrote:
> On Nov 24 09:36, Duncan Roe wrote:
>> On Tue, Nov 23, 2021 at 11:18:25AM -0700, Brian Inglis wrote:
>>>> On Nov 23 19:27, Duncan Roe wrote:
>>>>> Btw to whoever maintains grep for cygwin: 'make check' should pass on
>>>>> next release (I patched out the surrogate-pair failre).
>>>
>>> I had no problems with test-raise last release.
>>
>> I don't remember having a problem with it even a few weeks ago.
>>
>>> I did with surrogate pairs but after spending too much time on all the test
>>> infrastructure around that, decided it was a low probability event, and wait
>>> until anyone complains to refer it upstream.
>>
>> I wasted time on that too. That's why I patched surrogate-pair to not do its 3rd
>> test if 'uname -s' indicates Cygwin.
>>
>> For the full story, see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=27555#5
> 
> What is that "permanent restriction" in Cygwin?  Is that something we
> could fix or something unfixable?  Did you try to debug Cygwin in terms
> of that problem?  If not, could you extract a reduced, very simple
> stand-alone testcase for further debugging?
> 
>>> Do Cygwin and/or Windows support surrogate pairs in UTF-8?
> 
> You mean UTF-16.  UTF-8 doesn't know surrogate pairs, UTF-16 does.
> Originally there was UCS-2, 16 bits, with only 65536 code points.
> However, Unicode left the BMP already with version 2.0 in 1996, so
> UTF-16 and surrogate pairs became necessary.  Windows as well as Cygwin
> support them.

How does Cygwin support UTF-16 locales with surrogate pairs?
Are they the "native" locales inherited from Windows if others are not 
specified e.g. UTF-8, some OEM SBCS or MBCS?

>> There are 3 tests in surrogate-pair and only the 3rd one failed. So I guess
>> surrogate pairs in UTF-8 "mostly work".
> 
> UTF-16.  The surrogate stuff is evil at times.  Have a look at the
> __utf8_wctomb function in
> https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=newlib/libc/stdlib/wctomb_r.c
> Lone surrogate halfs in an input stream are a problem, for instance.

Thus the confusion with grep surrogate pair tests which appear to be 
running under a UTF-8 locale: see attached surrogate pair extract from 
cygport --debug grep.cygport check.

Trying to rerun cygport build most tests are now "skipped test: failed 
to find an adequate shell SKIP ... (exit status: 77)"! Something more 
may have changed (in gnulib?) to invalidate Cygwin shell(s) in something 
updated since that grep release in August, as I am getting the same 
skipped tests under GitHub CI, although it could just be that something 
expects say bash > 4.4 or even >= 5!

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]
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