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<h3>
Eric S. Raymond pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/44a99f7c3bcafe37d57e212896e5d3f3b74c4e41">44a99f7c</a></strong>
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<span>by Eric S. Raymond</span>
<i>at 2016-09-26T11:29:52-04:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Document the build-recipe organization.
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<h4>2 changed files:</h4>
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devel/TODO
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devel/tour.txt
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<h4>Changes:</h4>
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<a href="https://gitlab.com/NTPsec/ntpsec/commit/44a99f7c3bcafe37d57e212896e5d3f3b74c4e41#diff-0"><strong>devel/TODO</strong></a>
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<pre style="margin: 0"> <span id="LC4" class="line"></span>
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<pre style="margin: 0"> <span id="LC5" class="line">=== Build system ===</span>
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<pre style="margin: 0"> <span id="LC7" class="line">* Document build files.</span>
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<pre style="margin: 0"> <span id="LC7" class="line">* Cleanup and separate features in wafhelpers/*</span>
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<pre style="margin: 0"> <span id="LC9" class="line">* Add support for enabling all conditional checks to ensure none are broken.</span>
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<pre style="margin: 0"> <span id="LC147" class="line">[quote, ESR 2015-09-30]</span>
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<pre style="margin: 0"> <span id="LC151" class="line">* Write C++ required to glue the unit tests under test/ to Unity so they</span>
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<pre style="margin: 0"> <span id="LC152" class="line">  run when 'waf check' is called. Requires basic C++ skills.</span>
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<pre style="margin: 0"> <span id="LC153" class="line"></span>
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<pre style="margin: 0"> <span id="LC149" class="line">* In the docs subdirectory, include/command.txt is an HTML passthrough</span>
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<pre style="margin: 0"> <span id="LC150" class="line">  in a not entirely successful attempt to emulate the look of the</span>
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<pre style="margin: 0"> <span id="LC151" class="line">  Mills HTML documentation this directory was made from. It should be</span>
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<a href="https://gitlab.com/NTPsec/ntpsec/commit/44a99f7c3bcafe37d57e212896e5d3f3b74c4e41#diff-1"><strong>devel/tour.txt</strong></a>
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<pre style="margin: 0"> <span id="LC244" class="line">command on a system without refclocks.  That covers end nodes and</span>
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<pre style="margin: 0"> <span id="LC245" class="line">maybe lightly loaded servers.</span>
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<pre style="margin: 0"> <span id="LC246" class="line"></span>
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<pre style="margin: 0"> <span id="LC247" class="line">== The build recipe ==</span>
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<pre style="margin: 0"> <span id="LC248" class="line"></span>
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<pre style="margin: 0"> <span id="LC249" class="line">The build recipe is, essentially, a big Python program using a set of</span>
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<pre style="margin: 0"> <span id="LC250" class="line">specialized procedures caled 'waf'.  To learn about waf itself see</span>
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<pre style="margin: 0"> <span id="LC251" class="line">the https://waf.io/book/[Waf Book]; this section is about the</span>
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<pre style="margin: 0"> <span id="LC252" class="line">organization and particular quirks of NTPsec's build.</span>
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<pre style="margin: 0"> <span id="LC253" class="line"></span>
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<pre style="margin: 0"> <span id="LC254" class="line">If you are used to autoconf, you will find the waf reciple</span>
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<pre style="margin: 0"> <span id="LC255" class="line">odd at first.  We replaced autoconf because with waf the</span>
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<pre style="margin: 0"> <span id="LC256" class="line">build recipe is literally orders of magnitude less complex,</span>
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<pre style="margin: 0"> <span id="LC257" class="line">faster, and more maintainable.</span>
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<pre style="margin: 0"> <span id="LC258" class="line"></span>
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<pre style="margin: 0"> <span id="LC259" class="line">The top level wscript calls wscript files in various subdirectories</span>
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<pre style="margin: 0"> <span id="LC260" class="line">using the ctx.recurse() function. These subfiles are all relatively</span>
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<pre style="margin: 0"> <span id="LC261" class="line">simple, consisting mainly of calls to the waf function ctx().  Each</span>
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<pre style="margin: 0"> <span id="LC262" class="line">such call declares a build target to be composed (often using the</span>
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<pre style="margin: 0"> <span id="LC263" class="line">compiler) from various prerequisites.</span>
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<pre style="margin: 0"> <span id="LC264" class="line"></span>
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<pre style="margin: 0"> <span id="LC265" class="line">The top-level wscript does not itself declare a lot of targets (the</span>
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<pre style="margin: 0"> <span id="LC266" class="line">exceptions are a handful of installable shellscripts and man pages).</span>
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<pre style="margin: 0"> <span id="LC267" class="line">It is mainly concerned with setting up various assumptions for the</span>
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<pre style="margin: 0"> <span id="LC268" class="line">configure and build phases.</span>
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<pre style="margin: 0"> <span id="LC269" class="line"></span>
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<pre style="margin: 0"> <span id="LC270" class="line">If you are used to working with Makefiles, you may find the absence</span>
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<pre style="margin: 0"> <span id="LC271" class="line">of object files and binaries from the source directory after a build</span>
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<pre style="margin: 0"> <span id="LC272" class="line">surprising.  Look under the build/ directory.</span>
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<pre style="margin: 0"> <span id="LC273" class="line"></span>
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<pre style="margin: 0"> <span id="LC274" class="line">Most of the complexity in this build is in the configure phase, when</span>
</pre>
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<pre style="margin: 0"> <span id="LC275" class="line">the build engine is probing the environment.  The product of this</span>
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<pre style="margin: 0"> <span id="LC276" class="line">phase is the file build/config.h, which the C programs include to</span>
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<td class="diff-line-num new new_line" data-linenumber="277" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC277" class="line">get symbols whuich describe the environment's capabilities and</span>
</pre>
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<pre style="margin: 0"> <span id="LC278" class="line">quirks.</span>
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<pre style="margin: 0"> <span id="LC279" class="line"></span>
</pre>
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<pre style="margin: 0"> <span id="LC280" class="line">The configuration logic consists of a largish number of Python files</span>
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<pre style="margin: 0"> <span id="LC281" class="line">in the wafhelpers/ directory. The entire collection is structured as</span>
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<pre style="margin: 0"> <span id="LC282" class="line">a loadable Python module.  Here are a few useful generalizations:</span>
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<pre style="margin: 0"> <span id="LC283" class="line"></span>
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<pre style="margin: 0"> <span id="LC284" class="line">* The main sequence of the configuration logic, and most of the simpler</span>
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<pre style="margin: 0"> <span id="LC285" class="line">  checks, lives in configure.py.</span>
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<pre style="margin: 0"> <span id="LC286" class="line"></span>
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<pre style="margin: 0"> <span id="LC287" class="line">* For historical reasons, a few of the simpler checks outside</span>
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<pre style="margin: 0"> <span id="LC288" class="line">  configure.py live in probes.py.</span>
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<pre style="margin: 0"> <span id="LC289" class="line"></span>
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<pre style="margin: 0"> <span id="LC290" class="line">* The check_*.py files isolate checks for individual capabilities;</span>
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<pre style="margin: 0"> <span id="LC291" class="line">  you can generally figure out which ones by looking at the name.</span>
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<pre style="margin: 0"> <span id="LC292" class="line"></span>
</pre>
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<pre style="margin: 0"> <span id="LC293" class="line">* If you need to add a build or configure option, look in options.py.</span>
</pre>
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<pre style="margin: 0"> <span id="LC294" class="line">  You will usually be able to model your implementation on code that</span>
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<pre style="margin: 0"> <span id="LC295" class="line">  is already there.</span>
</pre>
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<pre style="margin: 0"> <span id="LC296" class="line"></span>
</pre>
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<pre style="margin: 0"> <span id="LC297" class="line">// end</span></pre>
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