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<section id="findswig">
<span id="module:FindSWIG"></span><h1>FindSWIG<a class="headerlink" href="#findswig" title="Permalink to this heading">ΒΆ</a></h1>
<p>Find the Simplified Wrapper and Interface Generator (<a class="reference external" href="https://swig.org">SWIG</a>) executable.</p>
<p>This module finds an installed SWIG and determines its version.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.18: </span>If a <code class="docutils literal notranslate"><span class="pre">COMPONENTS</span></code> or <code class="docutils literal notranslate"><span class="pre">OPTIONAL_COMPONENTS</span></code> argument is given to the
<span class="target" id="index-0-command:find_package"></span><a class="reference internal" href="../command/find_package.html#command:find_package" title="find_package"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_package()</span></code></a> command, it will also determine supported target
languages.</p>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.19: </span>When a version is requested, it can be specified as a simple value or as a
range. For a detailed description of version range usage and capabilities,
refer to the <span class="target" id="index-1-command:find_package"></span><a class="reference internal" href="../command/find_package.html#command:find_package" title="find_package"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_package()</span></code></a> command.</p>
</div>
<p>The module defines the following variables:</p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">SWIG_FOUND</span></code></dt><dd><p>Whether SWIG and any required components were found on the system.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">SWIG_EXECUTABLE</span></code></dt><dd><p>Path to the SWIG executable.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">SWIG_DIR</span></code></dt><dd><p>Path to the installed SWIG <code class="docutils literal notranslate"><span class="pre">Lib</span></code> directory (result of <code class="docutils literal notranslate"><span class="pre">swig</span> <span class="pre">-swiglib</span></code>).</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">SWIG_VERSION</span></code></dt><dd><p>SWIG executable version (result of <code class="docutils literal notranslate"><span class="pre">swig</span> <span class="pre">-version</span></code>).</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">SWIG_<lang>_FOUND</span></code></dt><dd><p>If <code class="docutils literal notranslate"><span class="pre">COMPONENTS</span></code> or <code class="docutils literal notranslate"><span class="pre">OPTIONAL_COMPONENTS</span></code> are requested, each available
target language <code class="docutils literal notranslate"><span class="pre"><lang></span></code> (lowercase) will be set to TRUE.</p>
</dd>
</dl>
<p>Any <code class="docutils literal notranslate"><span class="pre">COMPONENTS</span></code> given to <code class="docutils literal notranslate"><span class="pre">find_package</span></code> should be the names of supported
target languages as provided to the LANGUAGE argument of <code class="docutils literal notranslate"><span class="pre">swig_add_library</span></code>,
such as <code class="docutils literal notranslate"><span class="pre">python</span></code> or <code class="docutils literal notranslate"><span class="pre">perl5</span></code>. Language names <em>must</em> be lowercase.</p>
<p>All information is collected from the <code class="docutils literal notranslate"><span class="pre">SWIG_EXECUTABLE</span></code>, so the version
to be found can be changed from the command line by means of setting
<code class="docutils literal notranslate"><span class="pre">SWIG_EXECUTABLE</span></code>.</p>
<p>Example usage requiring SWIG 4.0 or higher and Python language support, with
optional Fortran support:</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">find_package(</span><span class="no">SWIG</span><span class="w"> </span><span class="m">4.0</span><span class="w"> </span><span class="no">COMPONENTS</span><span class="w"> </span><span class="nb">python</span><span class="w"> </span><span class="no">OPTIONAL_COMPONENTS</span><span class="w"> </span><span class="nb">fortran</span><span class="nf">)</span><span class="w"></span>
<span class="nf">if(</span><span class="no">SWIG_FOUND</span><span class="nf">)</span><span class="w"></span>
<span class="w"> </span><span class="nf">message(</span><span class="s">"SWIG found: ${SWIG_EXECUTABLE}"</span><span class="nf">)</span><span class="w"></span>
<span class="w"> </span><span class="nf">if(</span><span class="no">NOT</span><span class="w"> </span><span class="nb">SWIG_fortran_FOUND</span><span class="nf">)</span><span class="w"></span>
<span class="w"> </span><span class="nf">message(</span><span class="no">WARNING</span><span class="w"> </span><span class="s">"SWIG Fortran bindings cannot be generated"</span><span class="nf">)</span><span class="w"></span>
<span class="w"> </span><span class="nf">endif()</span><span class="w"></span>
<span class="nf">endif()</span><span class="w"></span>
</pre></div>
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