doc: Makefile: add support for xelatex

This patch makes the "latexpdf" target compile the documentation with
xelatex instead of the default pdflatex engine.

The reason behind this is stated in [YOCTO #14357]: pdflatex does not
support compiling foreign characters, so we need to resort to another
engine, here xelatex.

It also increases the texmf config buf_size to 10000000 to avoid a
compilation error.

(From yocto-docs rev: bd6265ca323fac547a197bb516dc4a9ef3897508)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/documentation/conf.py b/documentation/conf.py
index 9e87df0564..c7dd4e03fc 100644
--- a/documentation/conf.py
+++ b/documentation/conf.py
@@ -158,9 +158,14 @@ html_last_updated_fmt = '%b %d, %Y'
 # Remove the trailing 'dot' in section numbers
 html_secnumber_suffix = " "
 
+# We need XeTeX to process special unicode character, sometimes the contributor
+# list from the release note contains those.
+# See https://docs.readthedocs.io/en/stable/guides/pdf-non-ascii-languages.html.
+latex_engine = 'xelatex'
+latex_use_xindy = False
 latex_elements = {
     'passoptionstopackages': '\\PassOptionsToPackage{bookmarksdepth=5}{hyperref}',
-    'preamble': '\\setcounter{tocdepth}{2}',
+    'preamble': '\\usepackage[UTF8]{ctex}\n\\setcounter{tocdepth}{2}',
 }
 
 # Make the EPUB builder prefer PNG to SVG because of issues rendering Inkscape SVG