Change SPHINXOPTS in doc/makefile (ufs-community#83)

* add + to sphinxopts

* remove warning log

.github/workflows/auto_doc.yml

@@ -18,7 +18,6 @@ jobs:
       uses: ammaraskar/sphinx-action@dev
       with:
         docs-folder: "doc/"
-        build-command: "sphinx-build source build"
 
     - name: Upload artifacts
       uses: actions/upload-artifact@v3

doc/Makefile

@@ -3,7 +3,7 @@
 
 # You can set these variables from the command line, and also
 # from the environment for the first two.
-SPHINXOPTS    = -a -n #-W
+SPHINXOPTS    += -a -n
 SPHINXBUILD   ?= sphinx-build
 SOURCEDIR     = source
 BUILDDIR      = build
@@ -29,4 +29,4 @@ linkcheck:
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile
-	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) -w $(BUILDDIR)/warnings.log
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(0)