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| <div class="section" id="cmp0083"> | |
| <span id="policy:CMP0083"></span><h1>CMP0083<a class="headerlink" href="#cmp0083" title="Permalink to this headline">¶</a></h1> | |
| <div class="versionadded"> | |
| <p><span class="versionmodified added">New in version 3.14.</span></p> | |
| </div> | |
| <p>To control generation of Position Independent Executable (<code class="docutils literal notranslate"><span class="pre">PIE</span></code>) or not, some | |
| flags are required at link time.</p> | |
| <p>CMake 3.13 and lower did not add these link flags when | |
| <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> is set.</p> | |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to not manage <code class="docutils literal notranslate"><span class="pre">PIE</span></code> link flags. The | |
| <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior is to add link flags if <span class="target" id="index-1-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> | |
| is set:</p> | |
| <ul class="simple"> | |
| <li><p>Set to <code class="docutils literal notranslate"><span class="pre">TRUE</span></code>: flags to produce a position independent executable are | |
| passed to the linker step. For example <code class="docutils literal notranslate"><span class="pre">-pie</span></code> for <code class="docutils literal notranslate"><span class="pre">GCC</span></code>.</p></li> | |
| <li><p>Set to <code class="docutils literal notranslate"><span class="pre">FALSE</span></code>: flags not to produce a position independent executable are | |
| passed to the linker step. For example <code class="docutils literal notranslate"><span class="pre">-no-pie</span></code> for <code class="docutils literal notranslate"><span class="pre">GCC</span></code>.</p></li> | |
| <li><p>Not set: no flags are passed to the linker step.</p></li> | |
| </ul> | |
| <p>Since a given linker may not support <code class="docutils literal notranslate"><span class="pre">PIE</span></code> flags in all environments in | |
| which it is used, it is the project's responsibility to use the | |
| <span class="target" id="index-0-module:CheckPIESupported"></span><a class="reference internal" href="../module/CheckPIESupported.html#module:CheckPIESupported" title="CheckPIESupported"><code class="xref cmake cmake-module docutils literal notranslate"><span class="pre">CheckPIESupported</span></code></a> module to check for support to ensure that the | |
| <span class="target" id="index-2-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> | |
| <p>This policy was introduced in CMake version 3.14. Use the | |
| <span class="target" id="index-0-command:cmake_policy"></span><a class="reference internal" href="../command/cmake_policy.html#command:cmake_policy" title="cmake_policy"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_policy()</span></code></a> command to set it to <code class="docutils literal notranslate"><span class="pre">OLD</span></code> or <code class="docutils literal notranslate"><span class="pre">NEW</span></code> explicitly. | |
| Unlike most policies, CMake version 3.23.1 does not warn when this policy is | |
| not set and simply uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior.</p> | |
| <div class="admonition note"> | |
| <p class="admonition-title">Note</p> | |
| <p>Android platform has a special handling of <code class="docutils literal notranslate"><span class="pre">PIE</span></code> so it is not required | |
| to use the <span class="target" id="index-1-module:CheckPIESupported"></span><a class="reference internal" href="../module/CheckPIESupported.html#module:CheckPIESupported" title="CheckPIESupported"><code class="xref cmake cmake-module docutils literal notranslate"><span class="pre">CheckPIESupported</span></code></a> module to ensure flags are passed to | |
| the linker.</p> | |
| </div> | |
| <div class="admonition note"> | |
| <p class="admonition-title">Note</p> | |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of a policy is | |
| <span class="target" id="index-0-manual:cmake-policies(7)"></span><a class="reference internal" href="../manual/cmake-policies.7.html#manual:cmake-policies(7)" title="cmake-policies(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">deprecated</span> <span class="pre">by</span> <span class="pre">definition</span></code></a> | |
| and may be removed in a future version of CMake.</p> | |
| </div> | |
| <div class="section" id="examples"> | |
| <h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2> | |
| <p>Behave like CMake 3.13 and do not apply any <code class="docutils literal notranslate"><span class="pre">PIE</span></code> flags at link stage.</p> | |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">cmake_minimum_required(</span><span class="no">VERSION</span><span class="w"> </span><span class="m">3.13</span><span class="nf">)</span><span class="w"></span> | |
| <span class="nf">project(</span><span class="nb">foo</span><span class="nf">)</span><span class="w"></span> | |
| <span class="c"># ...</span> | |
| <span class="nf">add_executable(</span><span class="nb">foo</span><span class="w"> </span><span class="p">...</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> | |
| </pre></div> | |
| </div> | |
| <p>Use the <span class="target" id="index-2-module:CheckPIESupported"></span><a class="reference internal" href="../module/CheckPIESupported.html#module:CheckPIESupported" title="CheckPIESupported"><code class="xref cmake cmake-module docutils literal notranslate"><span class="pre">CheckPIESupported</span></code></a> module to detect whether <code class="docutils literal notranslate"><span class="pre">PIE</span></code> is | |
| supported by the current linker and environment. Apply <code class="docutils literal notranslate"><span class="pre">PIE</span></code> flags only | |
| if the linker supports them.</p> | |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">cmake_minimum_required(</span><span class="no">VERSION</span><span class="w"> </span><span class="m">3.14</span><span class="nf">)</span><span class="w"> </span><span class="c"># CMP0083 NEW</span> | |
| <span class="nf">project(</span><span class="nb">foo</span><span class="nf">)</span><span class="w"></span> | |
| <span class="nf">include(</span><span class="nb">CheckPIESupported</span><span class="nf">)</span><span class="w"></span> | |
| <span class="nf">check_pie_supported()</span><span class="w"></span> | |
| <span class="c"># ...</span> | |
| <span class="nf">add_executable(</span><span class="nb">foo</span><span class="w"> </span><span class="p">...</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> | |
| </pre></div> | |
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| <li><a class="reference internal" href="#">CMP0083</a><ul> | |
| <li><a class="reference internal" href="#examples">Examples</a></li> | |
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