Em Wed, 29 May 2019 17:02:02 -0600
Jonathan Corbet [off-list ref] escreveu:

On Mon, 27 May 2019 08:07:40 -0300
Mauro Carvalho Chehab [off-list ref] wrote:

quoted

Since Sphinx version 1.7, it is possible to use "-jauto" in
order to speedup documentation builds. On older versions,
while -j was already supported, one would need to set the
number of threads manually.

So, if SPHINXOPTS is not provided, add -jauto, in order to
speed up the build. That makes it *a lot* times faster than
without -j.

If one really wants to slow things down, it can just use:

	make SPHINXOPTS=-j1 htmldocs

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---
 Documentation/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 380e24053d6f..794233d05789 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile

@@ -28,6 +28,8 @@ ifeq ($(HAVE_SPHINX),0)
 
 else # HAVE_SPHINX
 
+SPHINXOPTS = $(shell perl -e 'open IN,"sphinx-build --version |"; while (<IN>) { if (m/([\d\.]+)/) { print "-jauto" if ($$1 >= "1.7") } ;} close IN')
+  

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

Afaikt, only too old versions will output it with a different format:


	$ sphinx-build --version
	Sphinx (sphinx-build) 1.2

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.

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

2.0.0:
	$ sphinx-build --version
	sphinx-build 2.0.0
	(sphinx_2.0) $ perl -e 'open IN,"sphinx-build --version |"; while (<IN>) { if (m/([\d\.]+)/) { print "-jauto\n" if ($1 >= "1.7") } ;} close IN'
-jauto


Thanks,
Mauro