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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> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.1.</span></p> |
| </div> |
| <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 notranslate"><span class="pre">-std=gnu++11</span></code> to the compile line. For compilers that |
| have no notion of a standard level, such as Microsoft Visual C++ before |
| 2015 Update 3, this has no effect.</p> |
| <p>Supported values are:</p> |
| <dl> |
| <dt><code class="docutils literal notranslate"><span class="pre">98</span></code></dt><dd><p>C++98</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">11</span></code></dt><dd><p>C++11</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">14</span></code></dt><dd><p>C++14</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">17</span></code></dt><dd><div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.8.</span></p> |
| </div> |
| <p>C++17</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">20</span></code></dt><dd><div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.12.</span></p> |
| </div> |
| <p>C++20</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">23</span></code></dt><dd><div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.20.</span></p> |
| </div> |
| <p>C++23</p> |
| </dd> |
| </dl> |
| <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 notranslate"><div class="highlight"><pre><span></span><span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">tgt</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="no">CXX_STANDARD</span><span class="w"> </span><span class="m">11</span><span class="nf">)</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>with a compiler which does not support <code class="docutils literal notranslate"><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 notranslate"><span class="pre">-std=gnu++98</span></code> flag if supported. This "decay" 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 notranslate"><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 notranslate"><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 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_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 notranslate"><span class="pre">CMAKE_CXX_STANDARD</span></code></a> variable if it is set when a target |
| is created.</p> |
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