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<section id="cmake-minimum-required">
<span id="command:cmake_minimum_required"></span><h1>cmake_minimum_required<a class="headerlink" href="#cmake-minimum-required" title="Permalink to this heading">¶</a></h1>
<p>Require a minimum version of cmake.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">cmake_minimum_required(</span><span class="no">VERSION</span><span class="w"> </span><span class="nv"><min></span><span class="p">[...</span><span class="nv"><policy_max></span><span class="p">]</span><span class="w"> </span><span class="p">[</span><span class="no">FATAL_ERROR</span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.12: </span>The optional <code class="docutils literal notranslate"><span class="pre"><policy_max></span></code> version.</p>
</div>
<p>Sets the minimum required version of cmake for a project.
Also updates the policy settings as explained below.</p>
<p><code class="docutils literal notranslate"><span class="pre"><min></span></code> and the optional <code class="docutils literal notranslate"><span class="pre"><policy_max></span></code> are each CMake versions of the
form <code class="docutils literal notranslate"><span class="pre">major.minor[.patch[.tweak]]</span></code>, and the <code class="docutils literal notranslate"><span class="pre">...</span></code> is literal.</p>
<p>If the running version of CMake is lower than the <code class="docutils literal notranslate"><span class="pre"><min></span></code> required
version it will stop processing the project and report an error.
The optional <code class="docutils literal notranslate"><span class="pre"><policy_max></span></code> version, if specified, must be at least the
<code class="docutils literal notranslate"><span class="pre"><min></span></code> version and affects policy settings as described in <a class="reference internal" href="#policy-settings">Policy Settings</a>.
If the running version of CMake is older than 3.12, the extra <code class="docutils literal notranslate"><span class="pre">...</span></code>
dots will be seen as version component separators, resulting in the
<code class="docutils literal notranslate"><span class="pre">...<max></span></code> part being ignored and preserving the pre-3.12 behavior
of basing policies on <code class="docutils literal notranslate"><span class="pre"><min></span></code>.</p>
<p>This command will set the value of the
<span class="target" id="index-0-variable:CMAKE_MINIMUM_REQUIRED_VERSION"></span><a class="reference internal" href="../variable/CMAKE_MINIMUM_REQUIRED_VERSION.html#variable:CMAKE_MINIMUM_REQUIRED_VERSION" title="CMAKE_MINIMUM_REQUIRED_VERSION"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_MINIMUM_REQUIRED_VERSION</span></code></a> variable to <code class="docutils literal notranslate"><span class="pre"><min></span></code>.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">FATAL_ERROR</span></code> option is accepted but ignored by CMake 2.6 and
higher. It should be specified so CMake versions 2.4 and lower fail
with an error instead of just a warning.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Call the <code class="docutils literal notranslate"><span class="pre">cmake_minimum_required()</span></code> command at the beginning of
the top-level <code class="docutils literal notranslate"><span class="pre">CMakeLists.txt</span></code> file even before calling the
<span class="target" id="index-0-command:project"></span><a class="reference internal" href="project.html#command:project" title="project"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">project()</span></code></a> command. It is important to establish version
and policy settings before invoking other commands whose behavior
they may affect. See also policy <span class="target" id="index-0-policy:CMP0000"></span><a class="reference internal" href="../policy/CMP0000.html#policy:CMP0000" title="CMP0000"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0000</span></code></a>.</p>
<p>Calling <code class="docutils literal notranslate"><span class="pre">cmake_minimum_required()</span></code> inside a <span class="target" id="index-0-command:function"></span><a class="reference internal" href="function.html#command:function" title="function"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">function()</span></code></a>
limits some effects to the function scope when invoked. For example,
the <span class="target" id="index-1-variable:CMAKE_MINIMUM_REQUIRED_VERSION"></span><a class="reference internal" href="../variable/CMAKE_MINIMUM_REQUIRED_VERSION.html#variable:CMAKE_MINIMUM_REQUIRED_VERSION" title="CMAKE_MINIMUM_REQUIRED_VERSION"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_MINIMUM_REQUIRED_VERSION</span></code></a> variable won't be set
in the calling scope. Functions do not introduce their own policy
scope though, so policy settings of the caller <em>will</em> be affected
(see below). Due to this mix of things that do and do not affect the
calling scope, calling <code class="docutils literal notranslate"><span class="pre">cmake_minimum_required()</span></code> inside a function
is generally discouraged.</p>
</div>
<section id="policy-settings">
<span id="id1"></span><h2>Policy Settings<a class="headerlink" href="#policy-settings" title="Permalink to this heading">¶</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">cmake_minimum_required(VERSION)</span></code> command implicitly invokes the
<span class="target" id="index-0-command:cmake_policy"></span><a class="reference internal" href="cmake_policy.html#command:cmake_policy" title="cmake_policy"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_policy(VERSION)</span></code></a> command to specify that the current
project code is written for the given range of CMake versions.
All policies known to the running version of CMake and introduced
in the <code class="docutils literal notranslate"><span class="pre"><min></span></code> (or <code class="docutils literal notranslate"><span class="pre"><max></span></code>, if specified) version or earlier will
be set to use <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior. All policies introduced in later
versions will be unset. This effectively requests behavior preferred
as of a given CMake version and tells newer CMake versions to warn
about their new policies.</p>
<p>When a <code class="docutils literal notranslate"><span class="pre"><min></span></code> version higher than 2.4 is specified the command
implicitly invokes</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">cmake_policy(</span><span class="no">VERSION</span><span class="w"> </span><span class="nv"><min></span><span class="p">[...</span><span class="nv"><max></span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>which sets CMake policies based on the range of versions specified.
When a <code class="docutils literal notranslate"><span class="pre"><min></span></code> version 2.4 or lower is given the command implicitly
invokes</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">cmake_policy(</span><span class="no">VERSION</span><span class="w"> </span><span class="m">2.4</span><span class="p">[...</span><span class="nv"><max></span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>which enables compatibility features for CMake 2.4 and lower.</p>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p><span class="target" id="index-1-command:cmake_policy"></span><a class="reference internal" href="cmake_policy.html#command:cmake_policy" title="cmake_policy"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_policy()</span></code></a></p></li>
</ul>
</section>
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<li><a class="reference internal" href="#see-also">See Also</a></li>
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