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Date:   Wed, 12 Aug 2020 14:44:13 +0200
From:   Markus Heiser <markus.heiser@...marit.de>
To:     Salvatore Bonaccorso <carnil@...ian.org>,
        linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>
Cc:     Bhaskar Chowdhury <unixbhaskar@...il.com>,
        LinuxKernel <linux-kernel@...r.kernel.org>,
        jforbes@...oraproject.org
Subject: Re: Documentation: build failure with sphinx >= 3.0.0: exception:
 cannot import name 'c_funcptr_sig_re' from 'sphinx.domains.c'


Am 12.08.20 um 10:21 schrieb Markus Heiser:
> 
> Am 12.08.20 um 09:30 schrieb Salvatore Bonaccorso:
> [..]
>>> The problem is actually related to changes happening in Sphinx 3.0.0.
>>> There is the followign issue filled upstream:
>>>
>>> https://github.com/sphinx-doc/sphinx/issues/7421
>>>
>>> 'c_funcptr_sig_re' was removed upstream in sphinx v3.0.0b1 and so the
>>> kernel documentation build fails. This is reproducible with a recent
>>> sphinx version (in attached case it is 3.2.0):
>>>
>>> $ make PYTHON=python3 xmldocs
>>>    SPHINX  xmldocs --> file:///home/build/linux/Documentation/output/xml
>>> make[2]: Nothing to be done for 'xml'.
>>> Running Sphinx v3.2.0
>>>
>>> Extension error:
>>> Could not import extension cdomain (exception: cannot import name 
>>> 'c_funcptr_sig_re' from 'sphinx.domains.c' 
>>> (/usr/lib/python3/dist-packages/sphinx/domains/c.py))
>>> make[1]: *** [Documentation/Makefile:115: xmldocs] Error 2
>>> make: *** [Makefile:1655: xmldocs] Error 2
>>>
>>> Distribution reports related to this issue:
>>> https://bugs.debian.org/963636
>>> https://bugs.archlinux.org/task/66178
>>> https://bugs.archlinux.org/task/66156
>>
>> As a workaround to make the documentation build again (but known that
>> parts of the documentation will be broken), we could drop the cdomain
>> extension.
>>
>> Regards,
>> Salvatore
> 
> @jon, do you have time to implement a patch?
> .. sorry, I'am in a hurry :o
> 
> In the linked github issue you find also a patch that fixes a
> cdomain.py.  I tested the patch (shee below) in the linux kernel.
> 
>    For me it works.

Sorry, I have to correct:

   a Patch needs more work

sphinx-doc has changed the way how domains are implemented [1].

-- Markus --

[1] https://github.com/sphinx-doc/sphinx/commit/0f49e30c

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