Treat Sphinx warnings as errors (GH-832) (GH-835)

(cherry picked from commit 334e9ec938ea9876baadef15edb135d6d2aff30c)

diff --git a/.travis.yml b/.travis.yml
index 66f03dc7161a7f09cfcdbb37a72db4c5ccee7c4b..3496a1abba2c9707fb79b3f6cf881ae1d2f0cfbe 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -39,7 +39,7 @@ matrix:
         - cd Doc
         - make venv
       script:
-        - make check suspicious html PYTHON="./venv/bin/python" SPHINXBUILD="./venv/bin/python -m sphinx" SPHINXOPTS="-q"
+        - make check suspicious html PYTHON="./venv/bin/python" SPHINXBUILD="./venv/bin/python -m sphinx" SPHINXOPTS="-q -W"
     - os: linux
       language: c
       compiler: clang