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<section id="checkcxxcompilerflag">
<span id="module:CheckCXXCompilerFlag"></span><h1>CheckCXXCompilerFlag<a class="headerlink" href="#checkcxxcompilerflag" title="Permalink to this heading"></a></h1>
<p>Check whether the CXX compiler supports a given flag.</p>
<dl class="cmake command">
<dt class="sig sig-object cmake" id="command:check_cxx_compiler_flag">
<span class="sig-name descname"><span class="pre">check_cxx_compiler_flag</span></span><a class="headerlink" href="#command:check_cxx_compiler_flag" title="Permalink to this definition"></a></dt>
<dd><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">check_cxx_compiler_flag(</span><span class="nv">&lt;flag&gt;</span><span class="w"> </span><span class="nv">&lt;var&gt;</span><span class="nf">)</span>
</pre></div>
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<p>Check that the <code class="docutils literal notranslate"><span class="pre">&lt;flag&gt;</span></code> is accepted by the compiler without
a diagnostic. Stores the result in an internal cache entry
named <code class="docutils literal notranslate"><span class="pre">&lt;var&gt;</span></code>.</p>
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<p>A positive result from this check indicates only that the compiler did not
issue a diagnostic message when given the flag. Whether the flag has any
effect or even a specific one is beyond the scope of this module.</p>
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like <span class="target" id="index-0-variable:CMAKE_&lt;LANG&gt;_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_&lt;LANG&gt;_FLAGS" title="CMAKE_&lt;LANG&gt;_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_FLAGS</span></code></a>, unknown flags
in such variables may cause a false negative for this check.</p>
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