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| <span id="policy:CMP0000"></span><h1>CMP0000<a class="headerlink" href="#cmp0000" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>A minimum required CMake version must be specified.</p> |
| <p>CMake requires that projects specify the version of CMake to which |
| they have been written. This policy has been put in place so users |
| trying to build the project may be told when they need to update their |
| CMake. Specifying a version also helps the project build with CMake |
| versions newer than that specified. Use the <span class="target" id="index-0-command:cmake_minimum_required"></span><a class="reference internal" href="../command/cmake_minimum_required.html#command:cmake_minimum_required" title="cmake_minimum_required"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_minimum_required()</span></code></a> |
| command at the top of your main <code class="docutils literal notranslate"><span class="pre">CMakeLists.txt</span></code> file:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>cmake_minimum_required(VERSION <major>.<minor>) |
| </pre></div> |
| </div> |
| <p>where <code class="docutils literal notranslate"><span class="pre"><major>.<minor></span></code> is the version of CMake you want to support |
| (such as <code class="docutils literal notranslate"><span class="pre">3.14</span></code>). The command will ensure that at least the given |
| version of CMake is running and help newer versions be compatible with |
| the project. See documentation of <span class="target" id="index-1-command:cmake_minimum_required"></span><a class="reference internal" href="../command/cmake_minimum_required.html#command:cmake_minimum_required" title="cmake_minimum_required"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_minimum_required()</span></code></a> for |
| details.</p> |
| <p>Note that the command invocation must appear in the <code class="docutils literal notranslate"><span class="pre">CMakeLists.txt</span></code> |
| file itself; a call in an included file is not sufficient. However, |
| the <span class="target" id="index-0-command:cmake_policy"></span><a class="reference internal" href="../command/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> command may be called to set policy <code class="docutils literal notranslate"><span class="pre">CMP0000</span></code> |
| to <code class="docutils literal notranslate"><span class="pre">OLD</span></code> or <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior explicitly. The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior is to |
| silently ignore the missing invocation. The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior is to issue |
| an error instead of a warning. An included file may set <code class="docutils literal notranslate"><span class="pre">CMP0000</span></code> |
| explicitly to affect how this policy is enforced for the main |
| <code class="docutils literal notranslate"><span class="pre">CMakeLists.txt</span></code> file.</p> |
| <p>This policy was introduced in CMake version 2.6.0.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of a policy is |
| <span class="target" id="index-0-manual:cmake-policies(7)"></span><a class="reference internal" href="../manual/cmake-policies.7.html#manual:cmake-policies(7)" title="cmake-policies(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">deprecated</span> <span class="pre">by</span> <span class="pre">definition</span></code></a> |
| and may be removed in a future version of CMake.</p> |
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