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| <div class="section" id="cmp0025"> |
| <span id="policy:CMP0025"></span><h1>CMP0025<a class="headerlink" href="#cmp0025" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Compiler id for Apple Clang is now <code class="docutils literal notranslate"><span class="pre">AppleClang</span></code>.</p> |
| <p>CMake 3.0 and above recognize that Apple Clang is a different compiler |
| than upstream Clang and that they have different version numbers. |
| CMake now prefers to present this to projects by setting the |
| <span class="target" id="index-0-variable:CMAKE_<LANG>_COMPILER_ID"></span><a class="reference internal" href="../variable/CMAKE_LANG_COMPILER_ID.html#variable:CMAKE_<LANG>_COMPILER_ID" title="CMAKE_<LANG>_COMPILER_ID"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_COMPILER_ID</span></code></a> variable to <code class="docutils literal notranslate"><span class="pre">AppleClang</span></code> instead |
| of <code class="docutils literal notranslate"><span class="pre">Clang</span></code>. However, existing projects may assume the compiler id for |
| Apple Clang is just <code class="docutils literal notranslate"><span class="pre">Clang</span></code> as it was in CMake versions prior to 3.0. |
| Therefore this policy determines for Apple Clang which compiler id to |
| report in the <span class="target" id="index-1-variable:CMAKE_<LANG>_COMPILER_ID"></span><a class="reference internal" href="../variable/CMAKE_LANG_COMPILER_ID.html#variable:CMAKE_<LANG>_COMPILER_ID" title="CMAKE_<LANG>_COMPILER_ID"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_COMPILER_ID</span></code></a> variable after |
| language <code class="docutils literal notranslate"><span class="pre"><LANG></span></code> is enabled by the <span class="target" id="index-0-command:project"></span><a class="reference internal" href="../command/project.html#command:project" title="project"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">project()</span></code></a> or |
| <span class="target" id="index-0-command:enable_language"></span><a class="reference internal" href="../command/enable_language.html#command:enable_language" title="enable_language"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">enable_language()</span></code></a> command. The policy must be set prior |
| to the invocation of either command.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to use compiler id <code class="docutils literal notranslate"><span class="pre">Clang</span></code>. The |
| <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior for this policy is to use compiler id <code class="docutils literal notranslate"><span class="pre">AppleClang</span></code>.</p> |
| <p>This policy was introduced in CMake version 3.0. 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 this policy 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 most policies, CMake version 3.23.1 does <em>not</em> warn |
| by default 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_CMP0025</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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