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Message-ID: <e362b49c-521c-4cd5-8963-c17d5770619b@SystematicSW.ab.ca>
Date: Sun, 3 May 2026 10:14:22 -0600
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Subject: Re: wcwidth broken with gcc 16
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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On 2026-05-03 06:00, Thomas Wolff via Cygwin wrote:
> Am 03.05.2026 um 12:58 schrieb Dimitry Andric:
>> On 3 May 2026, at 12:47, Thomas Wolff via Cygwin <cygwin AT cygwin DOT com> wrote:
>>> Am 03.05.2026 um 07:35 schrieb ASSI via Cygwin:
>>>> Thomas Wolff via Cygwin writes:
>>>>> Observed with gcc 16:
>>>>> For a number of character ranges, mainly (but not only) from CJK
>>>>> ranges, wcwidth incorrectly reports width 1 instead of 2, 0, or -1.
>>>>> Test file attached.
>>>> Can you report this upstream, please?
>>> I couldn't yet test it with gcc 16 on Linux as there is no Debian package.
>>> Did you test it?
>> It looks like BSD-based libc gives 1 for U+D7C6, U+D7CB and U+D7CB, while 
>> glibc gives 0.
> Thanks. Despite some differences, none of them gives the broken results of 
> gcc-16 on cygwin, so I wonder whether it makes sense to report upstream at this 
> time.

It appears that libiberty does not contain any mb/wc macros/functions, , and 
only contains safe-ctype IS... macros/functions with fixed ASCII characters.

Does gcc, like most GNU products, include some release of gnulib?
Could gnulib or gcc config detect some lack of support and "fix" newlib-cygwin 
support of Unicode properties declared in wchar.h/wctype.h, or used in i18n, 
libunistring, and Unicode string functions, especially if doing any kind of 
cross-bootstrap?

	https://www.gnu.org/software/gnulib/MODULES.html

I also note that w32api-headers/runtime are gcc runtime dependencies and hope 
they are used only in COFF/PE-related generation?

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

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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