bitbake: sphinx: add initial build infrastructure

Used sphinx-quickstart to generate top level config and
Makefile.sphinx, to allow side by side DocBook and Sphinx
co-existence.

(Bitbake rev: 84ccba0f4aff91528f764523fe1205a354c889ed)

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/doc/.gitignore

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+_build/

bitbake/doc/Makefile.sphinx

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+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile.sphinx
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile.sphinx
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

bitbake/doc/conf.py

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+# Configuration file for the Sphinx documentation builder.
+#
+# This file only contains a selection of the most common options. For a full
+# list see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+import datetime
+
+# -- Project information -----------------------------------------------------
+
+project = 'Bitbake'
+copyright = '2004-%s, Richard Purdie, Chris Larson, and Phil Blundell' \
+    % datetime.datetime.now().year
+author = 'Richard Purdie, Chris Larson, and Phil Blundell'
+
+
+# -- General configuration ---------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.autosectionlabel',
+]
+autosectionlabel_prefix_document = True
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# master document name. The default changed from contents to index. so better
+# set it ourselves.
+master_doc = 'index'
+
+# create substitution for project configuration variables
+rst_prolog = """
+.. |project_name| replace:: %s
+.. |copyright| replace:: %s
+.. |author| replace:: %s
+""" % (project, copyright, author)
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'alabaster'
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']

bitbake/doc/genindex.rst

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+=====
+Index
+=====

bitbake/doc/index.rst

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+.. The Yocto Project documentation master file, created by
+   sphinx-quickstart on Mon Apr 13 09:38:33 2020.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to Bitbake documentation!
+=================================
+
+.. toctree::
+   :maxdepth: 1
+