Make docs build stricter

docs/Makefile

@@ -55,7 +55,7 @@ clean:
 
 .PHONY: html
 html:
-	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
+	$(SPHINXBUILD) -W -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
 	@echo
 	@echo "Build finished. The HTML pages are in $(CUR_RELDIR)/$(BUILDDIR)/html."
 
@@ -67,38 +67,38 @@ serve: html
 
 .PHONY: dirhtml
 dirhtml:
-	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
+	$(SPHINXBUILD) -W -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
 	@echo
 	@echo "Build finished. The HTML pages are in $(CUR_RELDIR)/$(BUILDDIR)/dirhtml."
 
 .PHONY: singlehtml
 singlehtml:
-	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
+	$(SPHINXBUILD) -W -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
 	@echo
 	@echo "Build finished. The HTML page is in $(CUR_RELDIR)/$(BUILDDIR)/singlehtml."
 
 .PHONY: pickle
 pickle:
-	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
+	$(SPHINXBUILD) -W -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
 	@echo
 	@echo "Build finished; now you can process the pickle files."
 
 .PHONY: json
 json:
-	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
+	$(SPHINXBUILD) -W -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
 	@echo
 	@echo "Build finished; now you can process the JSON files."
 
 .PHONY: htmlhelp
 htmlhelp:
-	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
+	$(SPHINXBUILD) -W -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
 	@echo
 	@echo "Build finished; now you can run HTML Help Workshop with the" \
 	      ".hhp project file in $(CUR_RELDIR)/$(BUILDDIR)/htmlhelp."
 
 .PHONY: qthelp
 qthelp:
-	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
+	$(SPHINXBUILD) -W -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
 	@echo
 	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
 	      ".qhcp project file in $(CUR_RELDIR)/$(BUILDDIR)/qthelp, like this:"
@@ -108,7 +108,7 @@ qthelp:
 
 .PHONY: applehelp
 applehelp:
-	$(SPHINXBUILD) -b applehelp $(ALLSPHINXOPTS) $(BUILDDIR)/applehelp
+	$(SPHINXBUILD) -W -b applehelp $(ALLSPHINXOPTS) $(BUILDDIR)/applehelp
 	@echo
 	@echo "Build finished. The help book is in $(CUR_RELDIR)/$(BUILDDIR)/applehelp."
 	@echo "N.B. You won't be able to view it unless you put it in" \
@@ -117,7 +117,7 @@ applehelp:
 
 .PHONY: devhelp
 devhelp:
-	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
+	$(SPHINXBUILD) -W -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
 	@echo
 	@echo "Build finished."
 	@echo "To view the help file:"
@@ -127,98 +127,98 @@ devhelp:
 
 .PHONY: epub
 epub:
-	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
+	$(SPHINXBUILD) -W -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
 	@echo
 	@echo "Build finished. The epub file is in $(CUR_RELDIR)/$(BUILDDIR)/epub."
 
 .PHONY: latex
 latex:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	$(SPHINXBUILD) -W -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
 	@echo
 	@echo "Build finished; the LaTeX files are in $(CUR_RELDIR)/$(BUILDDIR)/latex."
 	@echo "Run \`make' in that directory to run these through (pdf)latex" \
 	      "(use \`make latexpdf' here to do that automatically)."
 
 .PHONY: latexpdf
 latexpdf:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	$(SPHINXBUILD) -W -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
 	@echo "Running LaTeX files through pdflatex..."
 	$(MAKE) -C $(BUILDDIR)/latex all-pdf
 	@echo "pdflatex finished; the PDF files are in $(CUR_RELDIR)/$(BUILDDIR)/latex."
 
 .PHONY: latexpdfja
 latexpdfja:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	$(SPHINXBUILD) -W -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
 	@echo "Running LaTeX files through platex and dvipdfmx..."
 	$(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
 	@echo "pdflatex finished; the PDF files are in $(CUR_RELDIR)/$(BUILDDIR)/latex."
 
 .PHONY: text
 text:
-	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
+	$(SPHINXBUILD) -W -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
 	@echo
 	@echo "Build finished. The text files are in $(CUR_RELDIR)/$(BUILDDIR)/text."
 
 .PHONY: man
 man:
-	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
+	$(SPHINXBUILD) -W -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
 	@echo
 	@echo "Build finished. The manual pages are in $(CUR_RELDIR)/$(BUILDDIR)/man."
 
 .PHONY: texinfo
 texinfo:
-	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	$(SPHINXBUILD) -W -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
 	@echo
 	@echo "Build finished. The Texinfo files are in $(CUR_RELDIR)/$(BUILDDIR)/texinfo."
 	@echo "Run \`make' in that directory to run these through makeinfo" \
 	      "(use \`make info' here to do that automatically)."
 
 .PHONY: info
 info:
-	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	$(SPHINXBUILD) -W -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
 	@echo "Running Texinfo files through makeinfo..."
 	make -C $(BUILDDIR)/texinfo info
 	@echo "makeinfo finished; the Info files are in $(CUR_RELDIR)/$(BUILDDIR)/texinfo."
 
 .PHONY: gettext
 gettext:
-	$(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
+	$(SPHINXBUILD) -W -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
 	@echo
 	@echo "Build finished. The message catalogs are in $(CUR_RELDIR)/$(BUILDDIR)/locale."
 
 .PHONY: changes
 changes:
-	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
+	$(SPHINXBUILD) -W -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
 	@echo
 	@echo "The overview file is in $(CUR_RELDIR)/$(BUILDDIR)/changes."
 
 .PHONY: linkcheck
 linkcheck:
-	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
+	$(SPHINXBUILD) -W -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
 	@echo
 	@echo "Link check complete; look for any errors in the above output " \
 	      "or in $(CUR_RELDIR)/$(BUILDDIR)/linkcheck/output.txt."
 
 .PHONY: doctest
 doctest:
-	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
+	$(SPHINXBUILD) -W -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
 	@echo "Testing of doctests in the sources finished, look at the " \
 	      "results in $(CUR_RELDIR)/$(BUILDDIR)/doctest/output.txt."
 
 .PHONY: coverage
 coverage:
-	$(SPHINXBUILD) -b coverage $(ALLSPHINXOPTS) $(BUILDDIR)/coverage
+	$(SPHINXBUILD) -W -b coverage $(ALLSPHINXOPTS) $(BUILDDIR)/coverage
 	@echo "Testing of coverage in the sources finished, look at the " \
 	      "results in $(CUR_RELDIR)/$(BUILDDIR)/coverage/python.txt."
 
 .PHONY: xml
 xml:
-	$(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
+	$(SPHINXBUILD) -W -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
 	@echo
 	@echo "Build finished. The XML files are in $(CUR_RELDIR)/$(BUILDDIR)/xml."
 
 .PHONY: pseudoxml
 pseudoxml:
-	$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
+	$(SPHINXBUILD) -W -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
 	@echo
 	@echo "Build finished. The pseudo-XML files are in $(CUR_RELDIR)/$(BUILDDIR)/pseudoxml."

setup.py

@@ -99,7 +99,7 @@ def str_from_file(name):
     "tox==3.14.0",
     "coverage==4.5.4",
     "sphinx==2.2.0",
-    "sphinx_rtd_theme==0.4.3",
+    "sphinx_rtd_theme==0.5.1",
     "twine==1.15.0",
     "wheel==0.33.6",
     "github3.py==1.3.0",

tox.ini

@@ -7,7 +7,7 @@
 ###############################################################################
 [tox]
 envlist =
-    docs, py38, py39
+    py38, py39
 platform =
     linux|darwin
 
@@ -43,11 +43,3 @@ commands =
 
 whitelist_externals =
     pytest
-
-[testenv:docs]
-basepython=python
-changedir=docs
-commands=sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
-
-whitelist_externals =
-    sphinx-build