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<div class="section" id="cxx-standard">
<span id="prop_tgt:CXX_STANDARD"></span><h1>CXX_STANDARD<a class="headerlink" href="#cxx-standard" title="Permalink to this headline">ΒΆ</a></h1>
<p>The C++ standard whose features are requested to build this target.</p>
<p>This property specifies the C++ standard whose features are requested
to build this target. For some compilers, this results in adding a
flag such as <code class="docutils literal"><span class="pre">-std=gnu++11</span></code> to the compile line. For compilers that
have no notion of a standard level, such as MSVC, this has no effect.</p>
<p>Supported values are <code class="docutils literal"><span class="pre">98</span></code>, <code class="docutils literal"><span class="pre">11</span></code>, <code class="docutils literal"><span class="pre">14</span></code>, and <code class="docutils literal"><span class="pre">17</span></code>.</p>
<p>If the value requested does not result in a compile flag being added for
the compiler in use, a previous standard flag will be added instead. This
means that using:</p>
<div class="highlight-cmake"><div class="highlight"><pre><span></span><span class="nb">set_property</span><span class="p">(</span><span class="s">TARGET</span> <span class="s">tgt</span> <span class="s">PROPERTY</span> <span class="s">CXX_STANDARD</span> <span class="s">11</span><span class="p">)</span>
</pre></div>
</div>
<p>with a compiler which does not support <code class="docutils literal"><span class="pre">-std=gnu++11</span></code> or an equivalent
flag will not result in an error or warning, but will instead add the
<code class="docutils literal"><span class="pre">-std=gnu++98</span></code> flag if supported. This &#8220;decay&#8221; behavior may be controlled
with the <span class="target" id="index-0-prop_tgt:CXX_STANDARD_REQUIRED"></span><a class="reference internal" href="CXX_STANDARD_REQUIRED.html#prop_tgt:CXX_STANDARD_REQUIRED" title="CXX_STANDARD_REQUIRED"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">CXX_STANDARD_REQUIRED</span></code></a> target property.
Additionally, 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"><span class="pre">CXX_EXTENSIONS</span></code></a> target property may be used to
control whether compiler-specific extensions are enabled on a per-target basis.</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"><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_CXX_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_CXX_STANDARD.html#variable:CMAKE_CXX_STANDARD" title="CMAKE_CXX_STANDARD"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_CXX_STANDARD</span></code></a> variable if it is set when a target
is created.</p>
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