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Subject[PATCH 09/10] docs: by default, build docs a lot faster with Sphinx >= 1.7
Date
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')
+
# User-friendly check for pdflatex and latexmk
HAVE_PDFLATEX := $(shell if which $(PDFLATEX) >/dev/null 2>&1; then echo 1; else echo 0; fi)
HAVE_LATEXMK := $(shell if which latexmk >/dev/null 2>&1; then echo 1; else echo 0; fi)
--
2.21.0
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