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<span id="variable:CMAKE_<LANG>_EXTENSIONS_DEFAULT"></span><h1>CMAKE_&lt;LANG&gt;_EXTENSIONS_DEFAULT<a class="headerlink" href="#cmake-lang-extensions-default" title="Permalink to this headline">ΒΆ</a></h1>
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<p><span class="versionmodified added">New in version 3.22.</span></p>
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<p>Compiler's default extensions mode. Used as the default for the
<span class="target" id="index-0-prop_tgt:&lt;LANG&gt;_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/LANG_EXTENSIONS.html#prop_tgt:&lt;LANG&gt;_EXTENSIONS" title="&lt;LANG&gt;_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">&lt;LANG&gt;_EXTENSIONS</span></code></a> target property when
<span class="target" id="index-0-variable:CMAKE_&lt;LANG&gt;_EXTENSIONS"></span><a class="reference internal" href="CMAKE_LANG_EXTENSIONS.html#variable:CMAKE_&lt;LANG&gt;_EXTENSIONS" title="CMAKE_&lt;LANG&gt;_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_&lt;LANG&gt;_EXTENSIONS</span></code></a> is not set (see <span class="target" id="index-0-policy:CMP0128"></span><a class="reference internal" href="../policy/CMP0128.html#policy:CMP0128" title="CMP0128"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0128</span></code></a>).</p>
<p>This variable is read-only. Modifying it is undefined behavior.</p>
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