linux-kernel - Re: [PATCH 4/5] docs: by default, build docs a lot faster with Sphinx >= 1.7

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Message-ID: <20190529174716.4f0e21ad@lwn.net>
Date:   Wed, 29 May 2019 17:47:16 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc:     Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] docs: by default, build docs a lot faster with
 Sphinx >= 1.7

On Wed, 29 May 2019 20:20:05 -0300
Mauro Carvalho Chehab <mchehab+samsung@...nel.org> wrote:

> > So this totally fails to work for me with any version of sphinx, and I'm
> > not enough of a Perl person to figure it out.  Sometimes I'll see the
> > sphinx-build output, i.e.:
> > 
> >     sphinx-build 1.8.4
> > 
> > and sometimes (like with 2.0) I don't, but I never get -jauto regardless.  
> 
> Hmm... with 2.0.0 --version prints the version.
> 
> 	$ sphinx-build --version
> 	sphinx-build 2.0.0

Yup.  The point is that I see the sphinx-build output *in the docs-build
output", not when I run it standalone (where it does the expected thing). 

> > Not sure what's going on here?  
> 
> Do you have SPHINXOPTS already set on your environment? If so, Makefile
> will not override the existing environment.

Yeah, I had it set to -j1 because I want to wait as long as possible for my
docs builds :)

No, I didn't have it set separately, made a point of that.

> Here, if I call it by hand (replacing $$1 by $1), it does the right
> thing. For example:
> 
> 1.8.4:
> 
> 	$ sphinx-build --version
> 	sphinx-build 1.8.4
> 	$ perl -e 'open IN,"sphinx-build --version |"; while (<IN>) { if (m/([\d\.]+)/) { print "-jauto\n" if ($1 >= "1.7") } ;} close IN'
> 	-jauto

$ perl -e 'open IN,"sphinx-build --version |"; while (<IN>) { if (m/([\d\.]+)/) { print "-jauto\n" if ($1 >= "1.7") } ;} close IN'
sphinx-build 1.8.4
$

It works properly with 2.0.1 - but only on the command line; I still don't
get the right behavior in a docs build.

Most weird.

This is an Fedora 30 system, FWIW.

jon