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Date: Tue, 25 Apr 2023 10:43:26 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: Juraj =?utf-8?Q?Linke=C5=A1?= <juraj.linkes@pantheon.tech>
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Subject: Re: [RFC PATCH v1 0/4] dts: add dts api docs
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On Tue, Apr 25, 2023 at 10:57:12AM +0200, Juraj Linkeš wrote:
> On Tue, Apr 25, 2023 at 10:44 AM Bruce Richardson
> <bruce.richardson@intel.com> wrote:
> >
> > On Tue, Apr 25, 2023 at 10:20:36AM +0200, Juraj Linkeš wrote:
> > > On Mon, Apr 3, 2023 at 11:42 AM Bruce Richardson
> > > <bruce.richardson@intel.com> wrote:
> > > >
> > > > On Mon, Apr 03, 2023 at 11:17:06AM +0200, Juraj Linkeš wrote:
> > > > > Hi Bruce, Thomas,
> > > > > The meson integration is kinda all over the place. I wanted to use the
> > > > > existing conf.py Sphinx config file, but I also wanted to keep the docs
> > > > > separated (because of extra DTS api docs dependencies), so the various
> > > > > pieces are in different places (the config file in one place, meson
> > > > > code in dts directory and generated Sphinx docs are in a new directory
> > > > > in the api build dir, separate from the rest of the Sphinx html).
> > > > > The big thing here is that I didn't figure out how to separate the dts
> > > > > api build from the rest of the docs. I don't know how the -Denable_docs
> > > > > option is supposed to work. I wanted to use -Denable_dts_docs in the
> > > > > same fashion to decouple the builds, but it doesn't seem to work.
> > > > > Reading the code I think the original option doesn't actually do
> > > > > anything - does it work? How is it supposed to work?
> > > > > Thanks,
> > > > > Juraj
> > > >
> > > > The enable_docs option works by selectively enabling the doc build tasks
> > > > using the "build_by_default" parameter on them.
> > > > See http://git.dpdk.org/dpdk/tree/doc/guides/meson.build#n23 for an
> > > > example. The custom_target for sphinx is not a dependency of any other
> > > > task, so whether it gets run or not depends entirely on whether the
> > > > "build_by_default" and/or "install" options are set.
> > > >
> > > > As usual, there may be other stuff that needs cleaning up on this, but
> > > > that's how it works for now, anyway. [And it does actually work, last I
> > > > tested it :-)]
> > >
> > > I looked into this and as is so frequently the case, we're both right. :-)
> > >
> > > When running according to docs, that is with:
> > > 1. meson setup doc_build
> > > 2. ninja -C doc_build doc
> > >
> > > it doesn't matter what enable_docs is set to, it always builds the docs.
> > >
> >
> > Yes, I'd forgotten that. That was deliberately done so one could always
> > request a doc build directly, without having to worry about DPDK config or
> > building the rest of DPDK.
> >
> > > But in the full build it does control whether docs are built, i.e.:
> > >
> > > 1. meson setup doc_build
> > > 2. ninja -C doc_build
> > > doesn't build the docs, whereas:
> > >
> > > 1. meson setup doc_build -Denable_docs=true
> > > 2. ninja -C doc_build
> > > builds the docs.
> > >
> > > Now the problem in this version is when doing just the doc build
> > > (ninja -C doc_build doc) both DPDK and DTS docs are built and I'd like
> > > to separate those (because DTS doc build has additional dependencies).
> > > I'm thinking the following would be a good solution within the current
> > > paradigm:
> > > 1. The -Denable_docs=true and -Denable_dts_docs=true options to
> > > separate doc builds for the full build.
> > > 2. Separate dts doc dir for the doc build ("ninja -C doc_build doc"
> > > for DPDK docs and "ninja -C doc_build dts" (or maybe some other dir)
> > > for DTS docs).
> >
> > How important is it to separate out the dts docs from the regular docs?
>
> It is mostly a matter of dependencies.
>
> > What are the additional dependencies, and how hard are they to get? If
> > possible I'd rather not have an additional build config option added for
> > this.
>
> The same dependencies as for running DTS, which are the proper Python
> version (3.10 and newer) with DTS depencies obtained with Poetry
> (which is a matter of installing Poetry and running it). As is
> standard with Python projects, this is all set up in a virtual
> environment, which needs to be activated before running the doc build.
> It's documented in more detail in the tools docs:
> https://doc.dpdk.org/guides/tools/dts.html#setting-up-dts-environment
>
> This may be too much of a hassle for DPDK devs to build non-DTS docs,
> but I don't know whether DPDK devs actually build docs at all.
>
Can't really say for sure. I suspect most don't build them on a daily
basis, but would often need to build them before submitting patches with a
doc change included.
What format are the DTS docs in? I agree that as described above the
requirements are pretty different than those for the regular DPDK docs.
> >
> > If we are separating them out, I think the dts doc target should be
> > "dts_doc" rather than "dts" for clarity.
>
> Agreed, but "dts_doc" would be a new top-level dir. I think we could
> do dts/doc (a dir inside dts).
>
That path seems reasonable to me.
/Bruce