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| <div class="section" id="cmp0018"> |
| <span id="policy:CMP0018"></span><h1>CMP0018<a class="headerlink" href="#cmp0018" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Ignore <code class="docutils literal notranslate"><span class="pre">CMAKE_SHARED_LIBRARY_<Lang>_FLAGS</span></code> variable.</p> |
| <p>CMake 2.8.8 and lower compiled sources in <code class="docutils literal notranslate"><span class="pre">SHARED</span></code> and <code class="docutils literal notranslate"><span class="pre">MODULE</span></code> libraries |
| using the value of the undocumented <code class="docutils literal notranslate"><span class="pre">CMAKE_SHARED_LIBRARY_<Lang>_FLAGS</span></code> |
| platform variable. The variable contained platform-specific flags |
| needed to compile objects for shared libraries. Typically it included |
| a flag such as <code class="docutils literal notranslate"><span class="pre">-fPIC</span></code> for position independent code but also included |
| other flags needed on certain platforms. CMake 2.8.9 and higher |
| prefer instead to use 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 to determine what targets should be position independent, and new |
| undocumented platform variables to select flags while ignoring |
| <code class="docutils literal notranslate"><span class="pre">CMAKE_SHARED_LIBRARY_<Lang>_FLAGS</span></code> completely.</p> |
| <p>The default for either approach produces identical compilation flags, |
| but if a project modifies <code class="docutils literal notranslate"><span class="pre">CMAKE_SHARED_LIBRARY_<Lang>_FLAGS</span></code> from its |
| original value this policy determines which approach to use.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to ignore the |
| <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> property for all targets and use the |
| modified value of <code class="docutils literal notranslate"><span class="pre">CMAKE_SHARED_LIBRARY_<Lang>_FLAGS</span></code> for <code class="docutils literal notranslate"><span class="pre">SHARED</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">MODULE</span></code> libraries.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior for this policy is to ignore |
| <code class="docutils literal notranslate"><span class="pre">CMAKE_SHARED_LIBRARY_<Lang>_FLAGS</span></code> whether it is modified or not and |
| honor 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.</p> |
| <p>This policy was introduced in CMake version 2.8.9. CMake version |
| 3.23.1 warns when the policy is not set and uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior. 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.</p> |
| <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> |
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