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| <div class="section" id="cmp0020"> |
| <span id="policy:CMP0020"></span><h1>CMP0020<a class="headerlink" href="#cmp0020" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Automatically link Qt executables to <code class="docutils literal notranslate"><span class="pre">qtmain</span></code> target on Windows.</p> |
| <p>CMake 2.8.10 and lower required users of Qt to always specify a link |
| dependency to the <code class="docutils literal notranslate"><span class="pre">qtmain.lib</span></code> static library manually on Windows. |
| CMake 2.8.11 gained the ability to evaluate generator expressions |
| while determining the link dependencies from <code class="docutils literal notranslate"><span class="pre">IMPORTED</span></code> targets. This |
| allows CMake itself to automatically link executables which link to Qt |
| to the <code class="docutils literal notranslate"><span class="pre">qtmain.lib</span></code> library when using <code class="docutils literal notranslate"><span class="pre">IMPORTED</span></code> Qt targets. For |
| applications already linking to <code class="docutils literal notranslate"><span class="pre">qtmain.lib</span></code>, this should have little |
| impact. For applications which supply their own alternative WinMain |
| implementation and for applications which use the QAxServer library, |
| this automatic linking will need to be disabled as per the |
| documentation.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is not to link executables to |
| <code class="docutils literal notranslate"><span class="pre">qtmain.lib</span></code> automatically when they link to the QtCore <code class="docutils literal notranslate"><span class="pre">IMPORTED</span></code> target. |
| The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior for this policy is to link executables to <code class="docutils literal notranslate"><span class="pre">qtmain.lib</span></code> |
| automatically when they link to QtCore <code class="docutils literal notranslate"><span class="pre">IMPORTED</span></code> target.</p> |
| <p>This policy was introduced in CMake version 2.8.11. 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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