OXIESEC PANEL

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  <section id="cmp0102">
<span id="policy:CMP0102"></span><h1>CMP0102<a class="headerlink" href="#cmp0102" title="Permalink to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.17.</span></p>
</div>
<p>The <span class="target" id="index-0-command:mark_as_advanced"></span><a class="reference internal" href="../command/mark_as_advanced.html#command:mark_as_advanced" title="mark_as_advanced"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">mark_as_advanced()</span></code></a> command no longer creates a cache entry if one
does not already exist.</p>
<p>In CMake 3.16 and below, if a variable was not defined at all or just defined
locally, the <span class="target" id="index-1-command:mark_as_advanced"></span><a class="reference internal" href="../command/mark_as_advanced.html#command:mark_as_advanced" title="mark_as_advanced"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">mark_as_advanced()</span></code></a> command would create a new cache
entry with an <code class="docutils literal notranslate"><span class="pre">UNINITIALIZED</span></code> type and no value. When a <span class="target" id="index-0-command:find_path"></span><a class="reference internal" href="../command/find_path.html#command:find_path" title="find_path"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_path()</span></code></a>
(or other similar <code class="docutils literal notranslate"><span class="pre">find_</span></code> command) would next run, it would find this
undefined cache entry and set it up with an empty string value. This process
would end up deleting the local variable in the process (due to the way the
cache works), effectively clearing any stored <code class="docutils literal notranslate"><span class="pre">find_</span></code> results that were only
available in the local scope.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to create the empty cache definition.
The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior of this policy is to ignore variables which do not
already exist in the cache.</p>
<p>This policy was introduced in CMake version 3.17.  Use 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 to set it to <code class="docutils literal notranslate"><span class="pre">OLD</span></code> or <code class="docutils literal notranslate"><span class="pre">NEW</span></code> explicitly.
Unlike many policies, CMake version 3.26.3 does <em>not</em> warn
when this policy is not set and simply uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior.  See
documentation of the <span class="target" id="index-0-variable:CMAKE_POLICY_WARNING_CMP&lt;NNNN&gt;"></span><a class="reference internal" href="../variable/CMAKE_POLICY_WARNING_CMPNNNN.html#variable:CMAKE_POLICY_WARNING_CMP&lt;NNNN&gt;" title="CMAKE_POLICY_WARNING_CMP&lt;NNNN&gt;"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_POLICY_WARNING_CMP0102</span></code></a> variable to control the warning.</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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