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  <section id="cmake-c-known-features">
<span id="prop_gbl:CMAKE_C_KNOWN_FEATURES"></span><h1>CMAKE_C_KNOWN_FEATURES<a class="headerlink" href="#cmake-c-known-features" title="Permalink to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.1.</span></p>
</div>
<p>List of C features known to this version of CMake.</p>
<p>The features listed in this global property may be known to be available to the
C compiler.  If the feature is available with the C compiler, it will
be listed in the <span class="target" id="index-0-variable:CMAKE_C_COMPILE_FEATURES"></span><a class="reference internal" href="../variable/CMAKE_C_COMPILE_FEATURES.html#variable:CMAKE_C_COMPILE_FEATURES" title="CMAKE_C_COMPILE_FEATURES"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_COMPILE_FEATURES</span></code></a> variable.</p>
<p>The features listed here may be used with the <span class="target" id="index-0-command:target_compile_features"></span><a class="reference internal" href="../command/target_compile_features.html#command:target_compile_features" title="target_compile_features"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_compile_features()</span></code></a>
command.  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>The features known to this version of CMake are listed below.</p>
<section id="high-level-meta-features-indicating-c-standard-support">
<h2>High level meta features indicating C standard support<a class="headerlink" href="#high-level-meta-features-indicating-c-standard-support" title="Permalink to this heading">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.8.</span></p>
</div>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">c_std_90</span></code></dt><dd><p>Compiler mode is at least C 90.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">c_std_99</span></code></dt><dd><p>Compiler mode is at least C 99.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">c_std_11</span></code></dt><dd><p>Compiler mode is at least C 11.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">c_std_17</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">New in version 3.21.</span></p>
</div>
<p>Compiler mode is at least C 17.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">c_std_23</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">New in version 3.21.</span></p>
</div>
<p>Compiler mode is at least C 23.</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If the compiler's default standard level is at least that
of the requested feature, CMake may omit the <code class="docutils literal notranslate"><span class="pre">-std=</span></code> flag.
The flag may still be added if the compiler's default extensions mode
does not match the <span class="target" id="index-0-prop_tgt:&lt;LANG&gt;_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/LANG_EXTENSIONS.html#prop_tgt:&lt;LANG&gt;_EXTENSIONS" title="&lt;LANG&gt;_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">&lt;LANG&gt;_EXTENSIONS</span></code></a> target property,
or if the <span class="target" id="index-0-prop_tgt:&lt;LANG&gt;_STANDARD"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD.html#prop_tgt:&lt;LANG&gt;_STANDARD" title="&lt;LANG&gt;_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">&lt;LANG&gt;_STANDARD</span></code></a> target property is set.</p>
</div>
</section>
<section id="low-level-individual-compile-features">
<h2>Low level individual compile features<a class="headerlink" href="#low-level-individual-compile-features" title="Permalink to this heading">¶</a></h2>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">c_function_prototypes</span></code></dt><dd><p>Function prototypes, as defined in <code class="docutils literal notranslate"><span class="pre">ISO/IEC</span> <span class="pre">9899:1990</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">c_restrict</span></code></dt><dd><p><code class="docutils literal notranslate"><span class="pre">restrict</span></code> keyword, as defined in <code class="docutils literal notranslate"><span class="pre">ISO/IEC</span> <span class="pre">9899:1999</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">c_static_assert</span></code></dt><dd><p>Static assert, as defined in <code class="docutils literal notranslate"><span class="pre">ISO/IEC</span> <span class="pre">9899:2011</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">c_variadic_macros</span></code></dt><dd><p>Variadic macros, as defined in <code class="docutils literal notranslate"><span class="pre">ISO/IEC</span> <span class="pre">9899:1999</span></code>.</p>
</dd>
</dl>
</section>
</section>

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<li><a class="reference internal" href="#high-level-meta-features-indicating-c-standard-support">High level meta features indicating C standard support</a></li>
<li><a class="reference internal" href="#low-level-individual-compile-features">Low level individual compile features</a></li>
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