docs: Generate qemu.1 manpage with Sphinx

Generate the qemu.1 manpage using Sphinx; we do this with a new
top-level rst source file which is just the skeleton of the manpage
and which includes .rst.inc fragments where it needs to incorporate
sections from the larger HTML manuals.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20200228153619.9906-30-peter.maydell@linaro.org

docs/system/conf.py

@@ -17,6 +17,8 @@ html_theme_options['description'] = u'System Emulation User''s Guide'
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
+    ('qemu-manpage', 'qemu', u'QEMU User Documentation',
+     ['Fabrice Bellard'], 1),
     ('qemu-block-drivers', 'qemu-block-drivers',
      u'QEMU block drivers reference',
      ['Fabrice Bellard and the QEMU Project developers'], 7),

docs/system/qemu-manpage.rst

@@ -0,0 +1,45 @@
+:orphan:
+
+..
+   This file is the skeleton for the qemu.1 manpage. It mostly
+   should simply include the .rst.inc files corresponding to the
+   parts of the documentation that go in the manpage as well as the
+   HTML manual.
+
+Title
+=====
+
+Synopsis
+--------
+
+.. parsed-literal::
+
+   |qemu_system| [options] [disk_image]
+
+Description
+-----------
+
+.. include:: target-i386-desc.rst.inc
+
+Options
+-------
+
+disk_image is a raw hard disk image for IDE hard disk 0. Some targets do
+not need a disk image.
+
+.. hxtool-doc:: qemu-options.hx
+
+.. include:: keys.rst.inc
+
+.. include:: mux-chardev.rst.inc
+
+Notes
+-----
+
+.. include:: device-url-syntax.rst.inc
+
+See also
+--------
+
+The HTML documentation of QEMU for more precise information and Linux
+user mode emulator invocation.