145 lines
7 KiB
HTML
145 lines
7 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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-->
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<title>How do I detect the ASDF version? (ASDF Manual)</title>
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<meta name="description" content="How do I detect the ASDF version? (ASDF Manual)">
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<meta name="keywords" content="How do I detect the ASDF version? (ASDF Manual)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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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="What-has-changed-between-ASDF-1-ASDF-2-and-ASDF-3_003f.html" rel="up" title="What has changed between ASDF 1 ASDF 2 and ASDF 3?">
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<link href="ASDF-can-portably-name-files-in-subdirectories.html" rel="next" title="ASDF can portably name files in subdirectories">
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<link href="What-are-ASDF-1-2-3_003f.html" rel="prev" title="What are ASDF 1 2 3?">
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<style type="text/css">
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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</style>
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</head>
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<body lang="en">
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<div class="subsection" id="How-do-I-detect-the-ASDF-version_003f">
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<div class="header">
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<p>
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Next: <a href="ASDF-can-portably-name-files-in-subdirectories.html" accesskey="n" rel="next">ASDF can portably name files in subdirectories</a>, Previous: <a href="What-are-ASDF-1-2-3_003f.html" accesskey="p" rel="prev">What are ASDF 1, ASDF 2, and ASDF 3?</a>, Up: <a href="What-has-changed-between-ASDF-1-ASDF-2-and-ASDF-3_003f.html" accesskey="u" rel="up">“What has changed between ASDF 1, ASDF 2, and ASDF 3?”</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="How-do-I-detect-the-ASDF-version_003f-1"></span><h4 class="subsection">13.3.2 How do I detect the ASDF version?</h4>
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<span id="index-asdf_002dversion"></span>
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<span id="index-_002afeatures_002a"></span>
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<p>All releases of ASDF
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push <code>:asdf</code> onto <code>*features*</code>.
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Releases starting with ASDF 2
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push <code>:asdf2</code> onto <code>*features*</code>.
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Releases starting with ASDF 3 (including 2.27 and later pre-releases)
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push <code>:asdf3</code> onto <code>*features*</code>.
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Furthermore, releases starting with ASDF 3.1.2 (May 2014),
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though they count as ASDF 3, include enough progress that they
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also push <code>:asdf3.1</code> onto <code>*features*</code>.
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You may depend on the presence or absence of these features
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to write code that takes advantage of recent ASDF functionality
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but still works on older versions, or at least detects the old version and signals an error.
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</p>
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<p>Additionally, all releases starting with ASDF 2
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define a function <code>(asdf:asdf-version)</code> you may use to query the version.
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All releases starting with 2.013 display the version number prominently
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on the second line of the <samp>asdf.lisp</samp> source file.
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</p>
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<p>If you are experiencing problems or limitations of any sort with ASDF 1 or ASDF 2,
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we recommend that you should upgrade to the latest release, be it ASDF 3 or other.
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</p>
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<p>Finally, here is a code snippet to programmatically determine what version of ASDF is loaded, if any,
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that works on all versions including very old ones:
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</p>
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<div class="example lisp">
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<pre class="lisp">(when (find-package :asdf)
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(let ((ver (symbol-value
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(or (find-symbol (string :*asdf-version*) :asdf)
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(find-symbol (string :*asdf-revision*) :asdf)))))
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(etypecase ver
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(string ver)
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(cons (with-output-to-string (s)
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(loop for (n . m) on ver
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do (princ n s)
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(when m (princ "." s)))))
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(null "1.0"))))
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</pre></div>
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<p>If it returns <code>nil</code> then ASDF is not installed.
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Otherwise it should return a string.
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If it returns <code>"1.0"</code>, then it can actually be
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any version before 1.77 or so, or some buggy variant of 1.x.
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If it returns anything older than <code>"3.0.1"</code>,
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you really need to upgrade your implementation or at least upgrade its ASDF.
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See <a href="Replacing-your-implementation_0027s-ASDF.html">Replacing your implementation’s ASDF</a>.
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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="ASDF-can-portably-name-files-in-subdirectories.html">ASDF can portably name files in subdirectories</a>, Previous: <a href="What-are-ASDF-1-2-3_003f.html">What are ASDF 1, ASDF 2, and ASDF 3?</a>, Up: <a href="What-has-changed-between-ASDF-1-ASDF-2-and-ASDF-3_003f.html">“What has changed between ASDF 1, ASDF 2, and ASDF 3?”</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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