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| <div class="section" id="cmp0023"> |
| <span id="policy:CMP0023"></span><h1>CMP0023<a class="headerlink" href="#cmp0023" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Plain and keyword <span class="target" id="index-0-command:target_link_libraries"></span><a class="reference internal" href="../command/target_link_libraries.html#command:target_link_libraries" title="target_link_libraries"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_libraries()</span></code></a> signatures cannot be mixed.</p> |
| <p>CMake 2.8.12 introduced the <span class="target" id="index-1-command:target_link_libraries"></span><a class="reference internal" href="../command/target_link_libraries.html#command:target_link_libraries" title="target_link_libraries"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_libraries()</span></code></a> signature using |
| the <code class="docutils literal notranslate"><span class="pre">PUBLIC</span></code>, <code class="docutils literal notranslate"><span class="pre">PRIVATE</span></code>, and <code class="docutils literal notranslate"><span class="pre">INTERFACE</span></code> keywords to generalize the |
| <code class="docutils literal notranslate"><span class="pre">LINK_PUBLIC</span></code> and <code class="docutils literal notranslate"><span class="pre">LINK_PRIVATE</span></code> keywords introduced in CMake 2.8.7. |
| Use of signatures with any of these keywords sets the link interface of a |
| target explicitly, even if empty. This produces confusing behavior |
| when used in combination with the historical behavior of the plain |
| <span class="target" id="index-2-command:target_link_libraries"></span><a class="reference internal" href="../command/target_link_libraries.html#command:target_link_libraries" title="target_link_libraries"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_libraries()</span></code></a> signature. For example, consider the code:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>target_link_libraries(mylib A) |
| target_link_libraries(mylib PRIVATE B) |
| </pre></div> |
| </div> |
| <p>After the first line the link interface has not been set explicitly so |
| CMake would use the link implementation, A, as the link interface. |
| However, the second line sets the link interface to empty. In order |
| to avoid this subtle behavior CMake now prefers to disallow mixing the |
| plain and keyword signatures of <span class="target" id="index-3-command:target_link_libraries"></span><a class="reference internal" href="../command/target_link_libraries.html#command:target_link_libraries" title="target_link_libraries"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_libraries()</span></code></a> for a single |
| target.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to allow keyword and plain |
| <span class="target" id="index-4-command:target_link_libraries"></span><a class="reference internal" href="../command/target_link_libraries.html#command:target_link_libraries" title="target_link_libraries"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_libraries()</span></code></a> signatures to be mixed. The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior for |
| this policy is to not to allow mixing of the keyword and plain |
| signatures.</p> |
| <p>This policy was introduced in CMake version 2.8.12. 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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