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From:   Jonathan Corbet <corbet@lwn.net>
To:     Akira Yokosawa <akiyks@gmail.com>
Cc:     "Wu X.C." <bobwxc@email.cn>, SeongJae Park <sj38.park@gmail.com>,
        Hu Haowen <src.res@email.cn>, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Mauro Carvalho Chehab <mchehab@kernel.org>
Subject: Re: [PATCH v3 6/9] docs: pdfdocs: One-half spacing for CJK
 translations
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 <87im0a207r.fsf@meer.lwn.net>
 <af64d80c-c1f7-7d32-9b28-e4b883dbe6e8@gmail.com>
Date:   Thu, 12 Aug 2021 09:14:52 -0600
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Akira Yokosawa <akiyks@gmail.com> writes:

> On Thu, 12 Aug 2021 08:42:48 -0600, Jonathan Corbet wrote:
>> Akira Yokosawa <akiyks@gmail.com> writes:
>> 
>>> On Mon, 2 Aug 2021 18:56:16 +0900, Akira Yokosawa wrote:
>>>> CJK documents are much easier to read with a wider baseline stretch.
>>>> Applying the onehalfspacing option of "setspace" package looks
>>>> reasonable.
>>>>
>>>> Note: \usepackage{setspace} needs to be before that of hyperref in the
>>>> preamble.  The 'extrapackages' key (available since Sphinx 2.3) is for
>>>> this purpose.
>>>
>>> Sphinx versions < 2.3 ignore 'extrapackages' and generate LaTeX
>>> sources without setspace package.
>>> Obviously, building such LaTeX sources will end up in the error of:
>>>
>>>     ! Undefined control sequence.
>>>     \kerneldocCJKoff ...exeCJKinactive \singlespacing
>>>
>>> Current requirement to build pdfdocs is Sphinx 2.4.4, but LaTeX
>>> sources generated by 1.7.9 can at least be built prior to this change.
>>>
>>> Jon, Mauro, do you think this is a regression?
>> 
>> Having the build just fail that way isn't really a good thing...it would
>> be far better to do the baseline tweaking only with versions of sphinx
>> that support it or, failing that, to at least refuse to build with a
>> suitably informative message.
>
> Hi Jon,
>
> This issue is fixed in v4 of the patch set.
> Can you please consider pulling v4?
>
> I have tested it against Sphinx versions 1.7.9, 2.4.4, and 4.1.2.

Ouch, weird...I definitely got v4, but somehow it managed to evade my
docs folder.  Apologies for that; I've just applied that version.

Thanks,

jon