Refer to xelatex and latex options via variables. This allows the user
to override the pdflatex and latex options to use on the make command
line for experimenting. As a side effect, this makes the makefile a bit
tidier.

Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 Documentation/Makefile.sphinx | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Documentation/Makefile.sphinx b/Documentation/Makefile.sphinx
index 92deea30b183..1314e3ee31c4 100644
--- a/Documentation/Makefile.sphinx
+++ b/Documentation/Makefile.sphinx
@@ -10,6 +10,8 @@ _SPHINXDIRS   = $(patsubst 
$(srctree)/Documentation/%/conf.py,%,$(wildcard $(src
 SPHINX_CONF   = conf.py
 PAPER         =
 BUILDDIR      = $(obj)/output
+PDFLATEX      = xelatex
+LATEXOPTS     = -interaction=nonstopmode
 
 # User-friendly check for sphinx-build
 HAVE_SPHINX := $(shell if which $(SPHINXBUILD) >/dev/null 2>&1; then echo 1; 
else echo 0; fi)
@@ -29,7 +31,7 @@ else ifneq ($(DOCBOOKS),)
 else # HAVE_SPHINX
 
 # User-friendly check for pdflatex
-HAVE_PDFLATEX := $(shell if which xelatex >/dev/null 2>&1; then echo 1; else 
echo 0; fi)
+HAVE_PDFLATEX := $(shell if which $(PDFLATEX) >/dev/null 2>&1; then echo 1; 
else echo 0; fi)
 
 # Internal variables.
 PAPEROPT_a4     = -D latex_paper_size=a4
@@ -68,7 +70,7 @@ htmldocs:
 
 latexdocs:
 ifeq ($(HAVE_PDFLATEX),0)
-       $(warning The 'xelatex' command was not found. Make sure you have it 
installed and in PATH to produce PDF output.)
+       $(warning The '$(PDFLATEX)' command was not found. Make sure you have 
it installed and in PATH to produce PDF output.)
        @echo "  SKIP    Sphinx $@ target."
 else # HAVE_PDFLATEX
        @$(foreach var,$(SPHINXDIRS),$(call 
loop_cmd,sphinx,latex,$(var),latex,$(var)))
@@ -76,7 +78,8 @@ endif # HAVE_PDFLATEX
 
 pdfdocs: latexdocs
 ifneq ($(HAVE_PDFLATEX),0)
-       $(foreach var,$(SPHINXDIRS), $(MAKE) PDFLATEX=xelatex 
LATEXOPTS="-interaction=nonstopmode" -C $(BUILDDIR)/$(var)/latex)
+       $(foreach var,$(SPHINXDIRS), $(MAKE) PDFLATEX=$(PDFLATEX) 
LATEXOPTS="$(LATEXOPTS)" -C $(BUILDDIR)/$(var)/latex)
+
 endif # HAVE_PDFLATEX
 
 epubdocs:
-- 
2.1.4

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