bug#79301: fold-spaces test failure

On 04/09/2025 18:36, Collin Funk wrote:
> Bruno Haible <[email protected]> writes:
> 
>> On 2025-08-24 I wrote:
>>> Today's CI reports a test failure
>>>    FAIL: tests/fold/fold-spaces
>>> on several systems:
>>>    - Alpine Linux,
>>>    - macOS 13..15,
>>>    - FreeBSD 14.
>>
>> Sorry for the incorrect reporting: macOS 13 and 14 failed with a fold-nbsp
>> failure (bug #79300), not a fold-spaces failure.
>>
>> As of today, the failures on macOS 13 and 14 are fixed. The failures on
>>    - Alpine Linux,
>>    - macOS 15,
>>    - FreeBSD 14
>> are still present in today's CI run.
> 
> Yep, I was planning on fixing this one next. So them failing is
> expected.
> 
> No worries about the slightly wrong platform list. I could reproduce
> them just fine.
> 
> My thinking is that the only portable test is ASCII space or TAB, since
> POSIX only requires those be treated as blank characters. I think it is
> fine to leave the current tests under a check for $host_os being gnu.

You might be able to use the uniq trick
to determine if a character is blank?

https://bugs.gnu.org/cgi/79300#32

cheers,
Padraig