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<div class="section" id="objcxx-extensions">
<span id="prop_tgt:OBJCXX_EXTENSIONS"></span><h1>OBJCXX_EXTENSIONS<a class="headerlink" href="#objcxx-extensions" title="Permalink to this headline">ΒΆ</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.16.</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=gnu++11</span></code> instead of <code class="docutils literal notranslate"><span class="pre">-std=c++11</span></code> to the compile line. This
property is <code class="docutils literal notranslate"><span class="pre">ON</span></code> by default. The basic ObjC++ standard level is
controlled by the <span class="target" id="index-0-prop_tgt:OBJCXX_STANDARD"></span><a class="reference internal" href="OBJCXX_STANDARD.html#prop_tgt:OBJCXX_STANDARD" title="OBJCXX_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">OBJCXX_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>If the property is not set, and the project has set the <span class="target" id="index-0-prop_tgt:CXX_EXTENSIONS"></span><a class="reference internal" href="CXX_EXTENSIONS.html#prop_tgt:CXX_EXTENSIONS" title="CXX_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">CXX_EXTENSIONS</span></code></a>,
the value of <span class="target" id="index-1-prop_tgt:CXX_EXTENSIONS"></span><a class="reference internal" href="CXX_EXTENSIONS.html#prop_tgt:CXX_EXTENSIONS" title="CXX_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">CXX_EXTENSIONS</span></code></a> is set for <span class="target" id="index-0-prop_tgt:OBJCXX_EXTENSIONS"></span><a class="reference internal" href="#prop_tgt:OBJCXX_EXTENSIONS" title="OBJCXX_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">OBJCXX_EXTENSIONS</span></code></a>.</p>
<p>This property is initialized by the value of
the <span class="target" id="index-0-variable:CMAKE_OBJCXX_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_OBJCXX_EXTENSIONS.html#variable:CMAKE_OBJCXX_EXTENSIONS" title="CMAKE_OBJCXX_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_OBJCXX_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_&lt;LANG&gt;_EXTENSIONS_DEFAULT"></span><a class="reference internal" href="../variable/CMAKE_LANG_EXTENSIONS_DEFAULT.html#variable:CMAKE_&lt;LANG&gt;_EXTENSIONS_DEFAULT" title="CMAKE_&lt;LANG&gt;_EXTENSIONS_DEFAULT"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_OBJCXX_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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