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| <div class="section" id="cmp0079"> |
| <span id="policy:CMP0079"></span><h1>CMP0079<a class="headerlink" href="#cmp0079" title="Permalink to this headline">ΒΆ</a></h1> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.13.</span></p> |
| </div> |
| <p><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> allows use with targets in other directories.</p> |
| <p>Prior to CMake 3.13 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> command did not |
| accept targets not created in the calling directory as its first argument |
| for calls that update the <span class="target" id="index-0-prop_tgt:LINK_LIBRARIES"></span><a class="reference internal" href="../prop_tgt/LINK_LIBRARIES.html#prop_tgt:LINK_LIBRARIES" title="LINK_LIBRARIES"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">LINK_LIBRARIES</span></code></a> of the target itself. |
| It did accidentally accept targets from other directories on calls that |
| only update the <span class="target" id="index-0-prop_tgt:INTERFACE_LINK_LIBRARIES"></span><a class="reference internal" href="../prop_tgt/INTERFACE_LINK_LIBRARIES.html#prop_tgt:INTERFACE_LINK_LIBRARIES" title="INTERFACE_LINK_LIBRARIES"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">INTERFACE_LINK_LIBRARIES</span></code></a>, but would simply |
| add entries to the property as if the call were made in the original |
| directory. Thus link interface libraries specified this way were always |
| looked up by generators in the scope of the original target rather than |
| in the scope that called <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>.</p> |
| <p>CMake 3.13 now allows the <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> command to |
| be called from any directory to add link dependencies and link interface |
| libraries to targets created in other directories. The entries are added |
| to <span class="target" id="index-1-prop_tgt:LINK_LIBRARIES"></span><a class="reference internal" href="../prop_tgt/LINK_LIBRARIES.html#prop_tgt:LINK_LIBRARIES" title="LINK_LIBRARIES"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">LINK_LIBRARIES</span></code></a> and <span class="target" id="index-1-prop_tgt:INTERFACE_LINK_LIBRARIES"></span><a class="reference internal" href="../prop_tgt/INTERFACE_LINK_LIBRARIES.html#prop_tgt:INTERFACE_LINK_LIBRARIES" title="INTERFACE_LINK_LIBRARIES"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">INTERFACE_LINK_LIBRARIES</span></code></a> |
| using a special (internal) suffix to tell the generators to look up the |
| names in the calling scope rather than the scope that created the target.</p> |
| <p>This policy provides compatibility with projects that already use |
| <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> with the <code class="docutils literal notranslate"><span class="pre">INTERFACE</span></code> keyword |
| on a target in another directory to add <span class="target" id="index-2-prop_tgt:INTERFACE_LINK_LIBRARIES"></span><a class="reference internal" href="../prop_tgt/INTERFACE_LINK_LIBRARIES.html#prop_tgt:INTERFACE_LINK_LIBRARIES" title="INTERFACE_LINK_LIBRARIES"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">INTERFACE_LINK_LIBRARIES</span></code></a> |
| entries to be looked up in the target's directory. Such projects should |
| be updated to be aware of the new scoping rules in that case.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of this policy is to disallow |
| <span class="target" id="index-5-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> calls naming targets from another directory |
| except in the previously accidentally allowed case of using the <code class="docutils literal notranslate"><span class="pre">INTERFACE</span></code> |
| keyword only. The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior of this policy is to allow all such |
| calls but use the new scoping rules.</p> |
| <p>This policy was introduced in CMake version 3.13. 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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