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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Markus Armbruster Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 4/11/20 2:29 PM, Peter Maydell wrote: > Our current docs don't build with Sphinx 3, as noted in > https://bugs.launchpad.net/bugs/1872113 -- this is a combination of: > (1) we are using the sphinx-build -W option so warnings are treated > as errors > (3) a kernel-doc script bug meant it was omitting a close-paren > when a function parameter was a function pointer; older Sphinx > ignored this but Sphinx 3 parses the function declaration and > warns about it; and because of (1) this is fatal to the QEMU build > (2) Sphinx 3 makes a breaking change in how it wants C structs > to be marked up (moving from 'c:type:: struct Foo' to > 'c:struct:: Foo'); our use of the old syntax provokes a > warning, which again because of point (1) is fatal > > Patch 1 extends configure's --disable-werror to cover Sphinx as > well as the C compiler, so that at least there is a workaround > (which will be automatic for release builds). > > Patch 2 fixes the trivial kernel-doc bug. > > Patch 3 adds and uses a new --sphinx-version option to kernel-doc, > so that our Sphinx plugin can pass the Sphinx version down and > the script can then choose the right syntax. > > I've marked this up as 'for-5.0?' because I think it would be > nice if at least patch 1 went in. Patch 2 seems uncontroversial > (though I guess we should forward it up to the kernel folks > since kernel-doc is from them originally). Patch 3 is the > expedient change, but you could argue about whether this is > the best way to tell kernel-doc what to do. > > thanks > -- PMM > I was curious about our actual version compatibility, so I did some testing. I modified configure to prefer 'sphinx-build' over 'sphinx-build-3' so it would use my venv version, and then; >From my qemu build directory (~/src/qemu/bin/git): > python3 -m venv 200 > source ./200/bin/activate.fish > pip install sphinx==2.0.0 > ../../configure --target-list='x86_64-softmmu' --enable-debug --enable-docs; and cat config-host.mak | grep sphinx; and make html; Repeat the process for the major versions we believe that we support in the abstract (1.3.x through 2.4.x): 1.3: Can't even pass the configure check with a blank document. Exception occurred: File "/home/jhuston/src/qemu/bin/git/130/lib64/python3.7/site-packages/sphinx/environment.py", line 146, in __init__ FileInput.__init__(self, *args, **kwds) TypeError: __init__() got an unexpected keyword argument 'handle_io_errors' The full traceback has been saved in /tmp/sphinx-err-owwisn63.log, if you want to report the issue to the developers. No idea. 1.4 - 1.4.9: Fails to build. Warning, treated as error: /home/jsnow/src/qemu/docs/system/images.rst:4: SEVERE: Duplicate ID: "cmdoption-qcow2-arg-encrypt". It doesn't seem to like the "encrypt.FOO" section names here and considers them duplicates, cutting off at the '.'. Not clear if there's a fix, or if it's worth caring about. 1.5 - 1.5.6: Fails to build. Warning, treated as error: /home/jsnow/src/qemu/docs/system/invocation.rst:544: WARNING: Malformed option description '[enable=]PATTERN', should look like "opt", "-opt args", "--opt args", "/opt args" or "+opt args" ... I actually don't know where this one goes wrong; that's not a valid line number there. device-url-syntax.rst.inc isn't that long either, so I don't know what this correlates to, unfortunately. 1.6.1 through 2.2.2 all appear to work just fine, but produce a lot of warnings about a coming incompatibility with Docutils > 0.16. 2.3.0 - 2.4.4 work silently with Docutils 0.16. 3.0.0: Notably fails, as is the subject of this patch. :) Conclusion: Required: >= 1.6.1 Recommended: >= 2.3.0 We can make this a little easier by using python virtual environments as part of our build tree; we can freeze version dependencies if we want to get more reproducible python builds. We might also begin "installing" the QAPI generator module into such a virtual environment such that the include statements are written in a more formal manner, which will assist for pylint and mypy gating, but that's another email. I want to send patches to: 1. Change configure to try and prefer a virtualenv version of sphinx-build, when found 2. Change sphinx conf.py to require >= 1.6.1 so that the requirement is documented 3. Update documentation (somewhere?) explaining our sphinx dependency and which versions are required and why ("Because 1.5.x does not work with our tree.") --js