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<section id="c-extensions">
<span id="prop_tgt:C_EXTENSIONS"></span><h1>C_EXTENSIONS<a class="headerlink" href="#c-extensions" title="Permalink to this heading">ΒΆ</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.1.</span></p>
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<p>Boolean specifying whether compiler specific extensions are requested.</p>
<p>This property specifies whether compiler specific extensions should be
used. For some compilers, this results in adding a flag such
as <code class="docutils literal notranslate"><span class="pre">-std=gnu11</span></code> instead of <code class="docutils literal notranslate"><span class="pre">-std=c11</span></code> to the compile line. This
property is <code class="docutils literal notranslate"><span class="pre">ON</span></code> by default. The basic C standard level is
controlled by the <span class="target" id="index-0-prop_tgt:C_STANDARD"></span><a class="reference internal" href="C_STANDARD.html#prop_tgt:C_STANDARD" title="C_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">C_STANDARD</span></code></a> target property.</p>
<p>See the <span class="target" id="index-0-manual:cmake-compile-features(7)"></span><a class="reference internal" href="../manual/cmake-compile-features.7.html#manual:cmake-compile-features(7)" title="cmake-compile-features(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-compile-features(7)</span></code></a> manual for information on
compile features and a list of supported compilers.</p>
<p>This property is initialized by the value of
the <span class="target" id="index-0-variable:CMAKE_C_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_C_EXTENSIONS.html#variable:CMAKE_C_EXTENSIONS" title="CMAKE_C_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_EXTENSIONS</span></code></a> variable if set when a target is created and
otherwise by the value of
<span class="target" id="index-0-variable:CMAKE_<LANG>_EXTENSIONS_DEFAULT"></span><a class="reference internal" href="../variable/CMAKE_LANG_EXTENSIONS_DEFAULT.html#variable:CMAKE_<LANG>_EXTENSIONS_DEFAULT" title="CMAKE_<LANG>_EXTENSIONS_DEFAULT"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_EXTENSIONS_DEFAULT</span></code></a> (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>
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