conf.py: Add support for sphinx 4.0+

ujfalusi · lgirdwood · commit 84c5ca5fa824 · 2021-05-21T12:41:32.000+01:00
add_stylesheet is removed with sphinx 4.0 and this will cause error in
conf.py
Fix it by trying to use the new add_css_file introduced in 1.8 and fall
back to add_stylesheet for older sphinx version.

Signed-off-by: Peter Ujfalusi &lt;peter.ujfalusi@linux.intel.com&gt;
diff --git a/conf.py b/conf.py
@@ -185,7 +185,10 @@
 def setup(app):
 # add_stylesheet() was renamed to add_css_file() in sphinx 1.8 released
 # in September 2018. add_stylesheet() will be removed in sphinx 4.0
-   app.add_stylesheet("sof-custom.css")
+    try:
+        app.add_css_file('sof-custom.css')
+    except AttributeError:
+        app.add_stylesheet('sof-custom.css')
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.
