[PATCH v2 5/5] scripts: sphinx-pre-install: place a warning for Sphinx >= 3.0

[Mauro Carvalho Chehab]

Newer versions of Sphinx have a known bug:
	https://github.com/sphinx-doc/sphinx/pull/8313

Those currently produces 11 false-positive warnings On Sphinx
version 3.1+.

While Sphinx fix is not applied, let's warn adventurers that would
be using Sphinx installed via distro packages.

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
---

To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH v2 0/5] at: https://lore.kernel.org/all/cover.1656756450.git.mchehab@xxxxxxxxxx/

 scripts/sphinx-pre-install | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 106d75425d3f..271c4eb1d702 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -902,6 +902,10 @@ sub recommend_sphinx_version($)
 	$need = $old_need;
 	$optional = $old_optional;
 
+	printf "\n    Please note that Sphinx >= 3.0 will currently produce false-positive\n";
+	printf "   warning when the same name is used for more than one type (functions,\n";
+	printf "   structs, enums,...). This is known Sphinx bug. For more details, see:\n";
+	printf "\thttps://github.com/sphinx-doc/sphinx/pull/8313\n";;
 }
 
 sub check_needs()
-- 
2.36.1