Parameter -W for sphinx-build turns build warnings into errors. This helps
us to avoid bad patches passing Gitlab CI.

Signed-off-by: Heinrich Schuchardt <[email protected]>
---
 doc/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/Makefile b/doc/Makefile
index 683e4b5609..050d9dd239 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -6,7 +6,7 @@ subdir-y :=

 # You can set these variables from the command line.
 SPHINXBUILD   = sphinx-build
-SPHINXOPTS    =
+SPHINXOPTS    = -W
 SPHINXDIRS    = .
 _SPHINXDIRS   = $(patsubst $(srctree)/doc/%/conf.py,%,$(wildcard 
$(srctree)/doc/*/conf.py))
 SPHINX_CONF   = conf.py
--
2.30.2

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