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| <div class="section" id="checkpiesupported"> |
| <span id="module:CheckPIESupported"></span><h1>CheckPIESupported<a class="headerlink" href="#checkpiesupported" title="Permalink to this headline">¶</a></h1> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.14.</span></p> |
| </div> |
| <p>Check whether the linker supports Position Independent Code (PIE) or No |
| Position Independent Code (NO_PIE) for executables. |
| Use this to ensure that the <span class="target" id="index-0-prop_tgt:POSITION_INDEPENDENT_CODE"></span><a class="reference internal" href="../prop_tgt/POSITION_INDEPENDENT_CODE.html#prop_tgt:POSITION_INDEPENDENT_CODE" title="POSITION_INDEPENDENT_CODE"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">POSITION_INDEPENDENT_CODE</span></code></a> target |
| property for executables will be honored at link time.</p> |
| <dl class="cmake command"> |
| <dt class="sig sig-object cmake" id="command:check_pie_supported"> |
| <span class="sig-name descname"><span class="pre">check_pie_supported</span></span><a class="headerlink" href="#command:check_pie_supported" title="Permalink to this definition">¶</a></dt> |
| <dd><div class="highlight-none notranslate"><div class="highlight"><pre><span></span>check_pie_supported([OUTPUT_VARIABLE <output>] |
| [LANGUAGES <lang>...]) |
| </pre></div> |
| </div> |
| <p>Options are:</p> |
| <dl> |
| <dt><code class="docutils literal notranslate"><span class="pre">OUTPUT_VARIABLE</span> <span class="pre"><output></span></code></dt><dd><p>Set <code class="docutils literal notranslate"><span class="pre"><output></span></code> variable with details about any error. If the check is |
| bypassed because it uses cached results from a previous call, the output |
| will be empty even if errors were present in the previous call.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">LANGUAGES</span> <span class="pre"><lang>...</span></code></dt><dd><p>Check the linkers used for each of the specified languages. |
| If this option is not provided, the command checks all enabled languages.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">C</span></code>, <code class="docutils literal notranslate"><span class="pre">CXX</span></code>, <code class="docutils literal notranslate"><span class="pre">Fortran</span></code> are supported.</p> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.23: </span><code class="docutils literal notranslate"><span class="pre">OBJC</span></code>, <code class="docutils literal notranslate"><span class="pre">OBJCXX</span></code>, <code class="docutils literal notranslate"><span class="pre">CUDA</span></code>, and <code class="docutils literal notranslate"><span class="pre">HIP</span></code> are supported.</p> |
| </div> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <p>It makes no sense to use this module when <span class="target" id="index-0-policy:CMP0083"></span><a class="reference internal" href="../policy/CMP0083.html#policy:CMP0083" title="CMP0083"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0083</span></code></a> is set to <code class="docutils literal notranslate"><span class="pre">OLD</span></code>, |
| so the command will return an error in this case. See policy <span class="target" id="index-1-policy:CMP0083"></span><a class="reference internal" href="../policy/CMP0083.html#policy:CMP0083" title="CMP0083"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0083</span></code></a> |
| for details.</p> |
| <div class="section" id="variables"> |
| <h2>Variables<a class="headerlink" href="#variables" title="Permalink to this headline">¶</a></h2> |
| <p>For each language checked, two boolean cache variables are defined.</p> |
| <blockquote> |
| <div><dl class="simple"> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_<lang>_LINK_PIE_SUPPORTED</span></code></dt><dd><p>Set to true if <code class="docutils literal notranslate"><span class="pre">PIE</span></code> is supported by the linker and false otherwise.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_<lang>_LINK_NO_PIE_SUPPORTED</span></code></dt><dd><p>Set to true if <code class="docutils literal notranslate"><span class="pre">NO_PIE</span></code> is supported by the linker and false otherwise.</p> |
| </dd> |
| </dl> |
| </div></blockquote> |
| </div> |
| <div class="section" id="examples"> |
| <h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">check_pie_supported()</span><span class="w"></span> |
| <span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">foo</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="no">POSITION_INDEPENDENT_CODE</span><span class="w"> </span><span class="no">TRUE</span><span class="nf">)</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="c"># Retrieve any error message.</span> |
| <span class="nf">check_pie_supported(</span><span class="no">OUTPUT_VARIABLE</span><span class="w"> </span><span class="nb">output</span><span class="w"> </span><span class="no">LANGUAGES</span><span class="w"> </span><span class="no">C</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">foo</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="no">POSITION_INDEPENDENT_CODE</span><span class="w"> </span><span class="no">TRUE</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">if(</span><span class="no">NOT</span><span class="w"> </span><span class="no">CMAKE_C_LINK_PIE_SUPPORTED</span><span class="nf">)</span><span class="w"></span> |
| <span class="w"> </span><span class="nf">message(</span><span class="no">WARNING</span><span class="w"> </span><span class="s">"PIE is not supported at link time: ${output}.\n"</span><span class="w"></span> |
| <span class="w"> </span><span class="s">"PIE link options will not be passed to linker."</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">endif()</span><span class="w"></span> |
| </pre></div> |
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| <li><a class="reference internal" href="#">CheckPIESupported</a><ul> |
| <li><a class="reference internal" href="#variables">Variables</a></li> |
| <li><a class="reference internal" href="#examples">Examples</a></li> |
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