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docs: Makefile: use latexmk if available 

In the past, Sphinx was generating a LaTex Makefile that would
run xelatex 3 times. Running it multiple times is needed in order
to make the indexes right.

However, newer versions of it runs it just once, as it expects
the machine to use the "latexmk" build, with automatically
detects the need for rebuilds.

So, add a logic at the Makefile in order to detect if latexmk
is installed. If so, it will call it.

As an additional bonus, the output of latexmk is a little bit
better, making easier to identify build problems.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mauro Carvalho Chehab 2019-03-30 10:45:58 -03:00 committed by Jonathan Corbet
parent 6c5d24eef7
commit 28f7c99425
1 changed files with 7 additions and 2 deletions
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9
Documentation/Makefile
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@ -28,8 +28,13 @@ ifeq ($(HAVE_SPHINX),0)
else # HAVE_SPHINX
# User-friendly check for pdflatex
# 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 := $(shell if which latexmk >/dev/null 2>&1; then echo 1; else echo 0; fi)
ifeq ($(HAVE_LATEXMK),1)
PDFLATEX := latexmk -$(PDFLATEX)
endif #HAVE_LATEXMK
# Internal variables.
PAPEROPT_a4 = -D latex_paper_size=a4
@ -82,7 +87,7 @@ pdfdocs:
else # HAVE_PDFLATEX
pdfdocs: latexdocs
$(foreach var,$(SPHINXDIRS), $(MAKE) PDFLATEX=$(PDFLATEX) LATEXOPTS="$(LATEXOPTS)" -C $(BUILDDIR)/$(var)/latex || exit;)
$(foreach var,$(SPHINXDIRS), $(MAKE) PDFLATEX="$(PDFLATEX)" LATEXOPTS="$(LATEXOPTS)" -C $(BUILDDIR)/$(var)/latex || exit;)
endif # HAVE_PDFLATEX