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| <span id="prop_tgt:C_STANDARD"></span><h1>C_STANDARD<a class="headerlink" href="#c-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=gnu11</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">90</span></code>, <code class="docutils literal"><span class="pre">99</span></code> and <code class="docutils literal"><span class="pre">11</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">C_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=gnu11</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=gnu99</span></code> or <code class="docutils literal"><span class="pre">-std=gnu90</span></code> flag if supported. This “decay” behavior may |
| be controlled with the <span class="target" id="index-0-prop_tgt:C_STANDARD_REQUIRED"></span><a class="reference internal" href="C_STANDARD_REQUIRED.html#prop_tgt:C_STANDARD_REQUIRED" title="C_STANDARD_REQUIRED"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">C_STANDARD_REQUIRED</span></code></a> target property. |
| Additionally, the <span class="target" id="index-0-prop_tgt:C_EXTENSIONS"></span><a class="reference internal" href="C_EXTENSIONS.html#prop_tgt:C_EXTENSIONS" title="C_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">C_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_C_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_C_STANDARD.html#variable:CMAKE_C_STANDARD" title="CMAKE_C_STANDARD"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_C_STANDARD</span></code></a> variable if it is set when a target |
| is created.</p> |
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