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<section id="checklinkerflag">
<span id="module:CheckLinkerFlag"></span><h1>CheckLinkerFlag<a class="headerlink" href="#checklinkerflag" title="Permalink to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.18.</span></p>
</div>
<p>Check whether the compiler supports a given link flag.</p>
<dl class="cmake command">
<dt class="sig sig-object cmake" id="command:check_linker_flag">
<span class="sig-name descname"><span class="pre">check_linker_flag</span></span><a class="headerlink" href="#command:check_linker_flag" title="Permalink to this definition">¶</a></dt>
<dd><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">check_linker_flag(</span><span class="nv"><lang></span><span class="w"> </span><span class="nv"><flag></span><span class="w"> </span><span class="nv"><var></span><span class="nf">)</span><span class="w"></span>
</pre></div>
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</dd></dl>
<p>Check that the link <code class="docutils literal notranslate"><span class="pre"><flag></span></code> is accepted by the <code class="docutils literal notranslate"><span class="pre"><lang></span></code> compiler without
a diagnostic. Stores the result in an internal cache entry named <code class="docutils literal notranslate"><span class="pre"><var></span></code>.</p>
<p>This command temporarily sets the <code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_LINK_OPTIONS</span></code> variable
and calls the <span class="target" id="index-0-command:check_source_compiles"></span><a class="reference internal" href="CheckSourceCompiles.html#command:check_source_compiles" title="check_source_compiles"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">check_source_compiles()</span></code></a> command from the
<span class="target" id="index-0-module:CheckSourceCompiles"></span><a class="reference internal" href="CheckSourceCompiles.html#module:CheckSourceCompiles" title="CheckSourceCompiles"><code class="xref cmake cmake-module docutils literal notranslate"><span class="pre">CheckSourceCompiles</span></code></a> module. See that module's documentation
for a listing of variables that can otherwise modify the build.</p>
<p>The underlying implementation relies on the <span class="target" id="index-0-prop_tgt:LINK_OPTIONS"></span><a class="reference internal" href="../prop_tgt/LINK_OPTIONS.html#prop_tgt:LINK_OPTIONS" title="LINK_OPTIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">LINK_OPTIONS</span></code></a> property
to check the specified flag. The <code class="docutils literal notranslate"><span class="pre">LINKER:</span></code> prefix, as described in the
<span class="target" id="index-0-command:target_link_options"></span><a class="reference internal" href="../command/target_link_options.html#command:target_link_options" title="target_link_options"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_options()</span></code></a> command, can be used as well.</p>
<p>A positive result from this check indicates only that the compiler did not
issue a diagnostic message when given the link flag. Whether the flag has any
effect or even a specific one is beyond the scope of this module.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Since the <span class="target" id="index-0-command:try_compile"></span><a class="reference internal" href="../command/try_compile.html#command:try_compile" title="try_compile"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_compile()</span></code></a> command forwards flags from variables
like <span class="target" id="index-0-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_FLAGS</span></code></a>, unknown flags in such variables may
cause a false negative for this check.</p>
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