115 lines
5.8 KiB
HTML
115 lines
5.8 KiB
HTML
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ASDF Copyright (C) 2001-2019 Daniel Barlow and contributors.
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<title>LOAD-PATHNAME has a weird value (ASDF Manual)</title>
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<div class="subsection" id="LOAD_002dPATHNAME-has-a-weird-value">
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<p>
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Next: <a href="How-can-I-produce-a-binary-at-a-specific-path-from-sources-at-a-specific-path.html" accesskey="n" rel="next">How can I produce a binary at a specific path from sources at a specific path?</a>, Previous: <a href="How-can-I-capture-ASDF_0027s-output_003f.html" accesskey="p" rel="prev">How can I capture ASDF’s output?</a>, Up: <a href="Issues-with-using-and-extending-ASDF-to-define-systems.html" accesskey="u" rel="up">Issues with using and extending ASDF to define 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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<span id="g_t_002aLOAD_002dPATHNAME_002a-and-_002aLOAD_002dTRUENAME_002a-have-weird-values_002c-help_0021"></span><h4 class="subsection">13.6.9 *LOAD-PATHNAME* and *LOAD-TRUENAME* have weird values, help!</h4>
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<span id="index-_002aLOAD_002dPATHNAME_002a"></span>
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<span id="index-_002aLOAD_002dTRUENAME_002a"></span>
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<p>Conventional Common Lisp code may use <code>*LOAD-TRUENAME*</code> or <code>*LOAD-PATHNAME*</code> to find
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files adjacent to source files. This will generally <em>not</em> work in
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ASDF-loaded systems. Recall that ASDF relocates the FASL files it
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builds, typically to a special cache directory. Thus the value of
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<code>*LOAD-PATHNAME*</code> and <code>*LOAD-TRUENAME*</code> at load time, when ASDF is loading your system,
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will typically be a pathname in that cache directory, and useless to you
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for finding other system components.
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</p>
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<p>There are two ways to work around this problem:
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</p><ol>
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<li> <span id="index-system_002drelative_002dpathname-1"></span>
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Use the <code>system-relative-pathname</code> function. This can readily be
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used from outside the system, but it is probably not good software
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engineering to require a source file <em>of</em> a system to know what
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system it is going to be part of. Contained objects should not have to
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know their containers.
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</li><li> Store the pathname at compile time, so that you get the pathname of the
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source file, which is presumably what you want. To do this, you can
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capture the value of <code>(or *compile-file-pathname* *load-truename*)</code>
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(or <code>*LOAD-PATHNAME*</code>, if you prefer)
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in a macro expansion or other compile-time evaluated context.
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</li></ol>
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</div>
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