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<section id="option">
<span id="command:option"></span><h1>option<a class="headerlink" href="#option" title="Permalink to this heading">ΒΆ</a></h1>
<p>Provide a boolean option that the user can optionally select.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">option(</span><span class="nv"><variable></span><span class="w"> </span><span class="s">"<help_text>"</span><span class="w"> </span><span class="p">[</span><span class="nb">value</span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
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<p>If no initial <code class="docutils literal notranslate"><span class="pre"><value></span></code> is provided, boolean <code class="docutils literal notranslate"><span class="pre">OFF</span></code> is the default value.
If <code class="docutils literal notranslate"><span class="pre"><variable></span></code> is already set as a normal or cache variable,
then the command does nothing (see policy <span class="target" id="index-0-policy:CMP0077"></span><a class="reference internal" href="../policy/CMP0077.html#policy:CMP0077" title="CMP0077"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0077</span></code></a>).</p>
<p>For options that depend on the values of other options, see
the module help for <span class="target" id="index-0-module:CMakeDependentOption"></span><a class="reference internal" href="../module/CMakeDependentOption.html#module:CMakeDependentOption" title="CMakeDependentOption"><code class="xref cmake cmake-module docutils literal notranslate"><span class="pre">CMakeDependentOption</span></code></a>.</p>
<p>In CMake project mode, a boolean cache variable is created with the option
value. In CMake script mode, a boolean variable is set with the option value.</p>
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