124 lines
5.9 KiB
HTML
124 lines
5.9 KiB
HTML
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<!-- This manual describes ASDF, a system definition facility
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for Common Lisp programs and libraries.
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You can find the latest version of this manual at
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https://common-lisp.net/project/asdf/asdf.html.
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ASDF Copyright (C) 2001-2019 Daniel Barlow and contributors.
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This manual Copyright (C) 2001-2019 Daniel Barlow and contributors.
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This manual revised (C) 2009-2019 Robert P. Goldman and Francois-Rene Rideau.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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<title>Dependencies (ASDF Manual)</title>
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<meta name="description" content="Dependencies (ASDF Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="The-object-model-of-ASDF.html" rel="up" title="The object model of ASDF">
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<link href="Functions.html" rel="next" title="Functions">
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</head>
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<body lang="en">
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<div class="section" id="Dependencies">
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<div class="header">
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<p>
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Next: <a href="Functions.html" accesskey="n" rel="next">Functions</a>, Previous: <a href="Components.html" accesskey="p" rel="prev">Components</a>, Up: <a href="The-object-model-of-ASDF.html" accesskey="u" rel="up">The Object model of ASDF</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="Dependencies-2"></span><h3 class="section">7.3 Dependencies</h3>
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<p>To be successfully build-able, this graph of actions must be acyclic.
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If, as a user, extender or implementer of ASDF, you introduce
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a cycle into the dependency graph,
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ASDF will fail loudly.
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To clearly distinguish the direction of dependencies,
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ASDF 3 uses the words <em>requiring</em> and <em>required</em>
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as applied to an action depending on the other:
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the requiring action <code>depends-on</code> the completion of all required actions
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before it may itself be <code>perform</code>ed.
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</p>
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<p>Using the <code>defsystem</code> syntax, users may easily express
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direct dependencies along the graph of the object hierarchy:
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between a component and its parent, its children, and its siblings.
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By defining custom CLOS methods, you can express more elaborate dependencies as you wish.
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Most common operations, such as <code>load-op</code>, <code>compile-op</code> or <code>load-source-op</code>
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are automatically propagate “downward” the component hierarchy and are “covariant” with it:
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to act the operation on the parent module, you must first act it on all the children components,
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with the action on the parent being parent of the action on each child.
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Other operations, such as <code>prepare-op</code> and <code>prepare-source-op</code>
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(introduced in ASDF 3) are automatically propagated “upward” the component hierarchy
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and are “contravariant” with it:
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to perform the operation of preparing for compilation of a child component,
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you must perform the operation of preparing for compilation of its parent component, and so on,
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ensuring that all the parent’s dependencies are (compiled and) loaded
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before the child component may be compiled and loaded.
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Yet other operations, such as <code>test-op</code> or <code>load-bundle-op</code>
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remain at the system level, and are not propagated along the hierarchy,
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but instead do something global on the system.
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</p>
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</div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Functions.html">Functions</a>, Previous: <a href="Components.html">Components</a>, Up: <a href="The-object-model-of-ASDF.html">The Object model of ASDF</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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