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<p>I've started a wiki page to document some of this discussion
<a class="moz-txt-link-freetext" href="https://gitlab.haskell.org/ghc/ghc/wikis/Developing-Hadrian">https://gitlab.haskell.org/ghc/ghc/wikis/Developing-Hadrian</a>. We'll
also need to deal with ouputs as well as inputs (dependencies)
soon. Hence I've expanded a bit on my understanding of rule
*outputs* and added the terms "vital input" and "vital output"
(does it make sense? is there a better name here?). I've slightly
changed the definition of "shallow dependencies" so that by
definition it is a (minimal) subset of direct dependencies such
that "<em>no change in the shallow dependencies -> no change in
the vial output</em>" The important part to take away is that
rules must:</p>
<ul>
<li>`<tt>need</tt>` all shallow dependencies.</li>
<li data-sourcepos="40:1-41:0">
<code>`produces</code>` all vital outputs (excluding the rule
target).</li>
</ul>
<p>David E<br>
</p>
<div class="moz-cite-prefix">On 3/27/19 11:23 PM, Andrey Mokhov
wrote:<br>
</div>
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--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">Simon:
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">>
Perhaps the remaining un-tracked dependencies will be fewer
and easier to nail?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">There are a
few other cases where we `need` only a subset of direct
dependencies that "cover" all others. For example,
`setup-config` files produced when configuring a package are
used to signal the completion of package configuration,
which might produce a few other hard-to-predict files, such
as “build/include/HsBaseConfig.h”.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">I just
realised that if one wants to have “hermetic builds”, where
build commands are executed in a sandbox, then it is
absolutely necessary to declare all direct dependencies
without exception, because they will need to be made
available in the sandbox for the build command to succeed.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">David:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">>
Perhaps the best step forward is to simply silence the
linting<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">> using
`trackAllow ["//*.hi"]` for haskell object rules. Then<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">> I can
continue tracking down other missing dependencies in<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">>
Hadrian with fsatrace linting.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">Yes, this
looks like the best approach for now.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US">Andrey<o:p></o:p></span></p>
</div>
</blockquote>
<pre class="moz-signature" cols="72">--
David Eichmann, Haskell Consultant
Well-Typed LLP, <a class="moz-txt-link-freetext" href="http://www.well-typed.com">http://www.well-typed.com</a>
Registered in England & Wales, OC335890
118 Wymering Mansions, Wymering Road, London W9 2NF, England </pre>
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