Minor cleanups for SDK devsite docs.

native_client_sdk/src/doc/Makefile

 # Makefile for Sphinx documentation
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
+SPHINXOPTS    = -W
 SPHINXBUILD   = sphinx-build
 PAPER         =
 BUILDDIR      = _build
 
 # User-friendly check for sphinx-build
 ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
 $(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
 endif
 
 # Internal variables.
 PAPEROPT_a4     = -D latex_paper_size=a4
 PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
 # the i18n builder cannot share the environment and doctrees with the others
 I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
 
-.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext all
+
+all: devsite
 
 help:
         @echo "Please use \`make <target>' where <target> is one of"
         @echo "  html       to make standalone HTML files"
         @echo "  dirhtml    to make HTML files named index.html in directories"
         @echo "  singlehtml to make a single large HTML file"
         @echo "  pickle     to make pickle files"
         @echo "  json       to make JSON files"
         @echo "  htmlhelp   to make HTML files and a HTML help project"
         @echo "  qthelp     to make HTML files and a qthelp project"
@@ skipping 143 matching lines @@
 pseudoxml:
         $(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
         @echo
         @echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."
 
 devsite:
         $(SPHINXBUILD) -b devsite $(ALLSPHINXOPTS) $(BUILDDIR)/devsite
 
 serve:
         cd _build/devsite && python -m SimpleHTTPServer 8009