[dpdk-dev] [PATCH] doc: fix build with Sphinx 4

[Thomas Monjalon <thomas@monjalon.net>]

Sphinx 4.0 became stricter with permalink configuration:
"
html_add_permalinks has been deprecated since v3.5.0.
Please use html_permalinks and html_permalinks_icon instead.
"

The new variable is used while keeping compatibility
with older Sphinx versions.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
 doc/guides/conf.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/doc/guides/conf.py b/doc/guides/conf.py
index ec59aeae7e..c22caaa247 100644
--- a/doc/guides/conf.py
+++ b/doc/guides/conf.py
@@ -31,7 +31,10 @@
 project = 'Data Plane Development Kit'
 html_logo = '../logo/DPDK_logo_vertical_rev_small.png'
 latex_logo = '../logo/DPDK_logo_horizontal_tag.png'
-html_add_permalinks = ""
+if LooseVersion(sphinx_version) >= LooseVersion('3.5'):
+    html_permalinks = False
+else:
+    html_add_permalinks = ""
 html_show_copyright = False
 highlight_language = 'none'
 
-- 
2.31.1