109 lines
5 KiB
HTML
109 lines
5 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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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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<title>Truenames and other dangers (ASDF Manual)</title>
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<meta name="description" content="Truenames and other dangers (ASDF Manual)">
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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="Controlling-where-ASDF-searches-for-systems.html" rel="up" title="Controlling where ASDF searches for systems">
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<div class="section" id="Truenames-and-other-dangers">
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<div class="header">
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<p>
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Next: <a href="XDG-base-directory.html" accesskey="n" rel="next">XDG base directory</a>, Previous: <a href="Configurations.html" accesskey="p" rel="prev">Configurations</a>, Up: <a href="Controlling-where-ASDF-searches-for-systems.html" accesskey="u" rel="up">Controlling where ASDF searches for systems</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="Truenames-and-other-dangers-1"></span><h3 class="section">8.2 Truenames and other dangers</h3>
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<p>One great innovation of the original ASDF was its ability to leverage
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<code>CL:TRUENAME</code> to locate where your source code was and where to build it,
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allowing for symlink farms as a simple but effective configuration mechanism
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that is easy to control programmatically.
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ASDF 3 still supports this configuration style, and it is enabled by default;
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however we recommend you instead use
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our source-registry configuration mechanism described below,
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because it is easier to setup in a portable way across users and implementations.
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</p>
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<p>Additionally, some people dislike truename,
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either because it is very slow on their system, or
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because they are using content-addressed storage where the truename of a file
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is related to a digest of its individual contents,
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and not to other files in the same intended project.
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For these people, ASDF 3 allows to eschew the <code>TRUENAME</code> mechanism,
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by setting the variable <var>asdf:*resolve-symlinks*</var> to <code>nil</code>.
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</p>
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<p>PS: Yes, if you haven’t read Vernor Vinge’s short but great classic
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“True Names... and Other Dangers” then you’re in for a treat.
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</p>
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