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| <div class="section" id="cmp0028"> |
| <span id="policy:CMP0028"></span><h1>CMP0028<a class="headerlink" href="#cmp0028" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Double colon in target name means <code class="docutils literal notranslate"><span class="pre">ALIAS</span></code> or <code class="docutils literal notranslate"><span class="pre">IMPORTED</span></code> target.</p> |
| <p>CMake 2.8.12 and lower allowed the use of targets and files with double |
| colons in <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>, with some buildsystem generators.</p> |
| <p>The use of double-colons is a common pattern used to namespace <code class="docutils literal notranslate"><span class="pre">IMPORTED</span></code> |
| targets and <code class="docutils literal notranslate"><span class="pre">ALIAS</span></code> targets. When computing the link dependencies of |
| a target, the name of each dependency could either be a target, or a file |
| on disk. Previously, if a target was not found with a matching name, the name |
| was considered to refer to a file on disk. This can lead to confusing error |
| messages if there is a typo in what should be a target name.</p> |
| <p>See also the <span class="target" id="index-0-prop_tgt:LINK_LIBRARIES_ONLY_TARGETS"></span><a class="reference internal" href="../prop_tgt/LINK_LIBRARIES_ONLY_TARGETS.html#prop_tgt:LINK_LIBRARIES_ONLY_TARGETS" title="LINK_LIBRARIES_ONLY_TARGETS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">LINK_LIBRARIES_ONLY_TARGETS</span></code></a> target property.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to search for targets, then files on |
| disk, even if the search term contains double-colons. The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior |
| for this policy is to issue a <code class="docutils literal notranslate"><span class="pre">FATAL_ERROR</span></code> if a link dependency contains |
| double-colons but is not an <code class="docutils literal notranslate"><span class="pre">IMPORTED</span></code> target or an <code class="docutils literal notranslate"><span class="pre">ALIAS</span></code> target.</p> |
| <p>This policy was introduced in CMake version 3.0. 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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