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| <div class="section" id="cmp0102"> |
| <span id="policy:CMP0102"></span><h1>CMP0102<a class="headerlink" href="#cmp0102" title="Permalink to this headline">ΒΆ</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 3.23.1 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<NNNN>"></span><a class="reference internal" href="../variable/CMAKE_POLICY_WARNING_CMPNNNN.html#variable:CMAKE_POLICY_WARNING_CMP<NNNN>" title="CMAKE_POLICY_WARNING_CMP<NNNN>"><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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