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| <div class="section" id="link-directories"> | |
| <span id="command:link_directories"></span><h1>link_directories<a class="headerlink" href="#link-directories" title="Permalink to this headline">ΒΆ</a></h1> | |
| <p>Add directories in which the linker will look for libraries.</p> | |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">link_directories(</span><span class="p">[</span><span class="no">AFTER</span><span class="p">|</span><span class="no">BEFORE</span><span class="p">]</span><span class="w"> </span><span class="nb">directory1</span><span class="w"> </span><span class="p">[</span><span class="nb">directory2</span><span class="w"> </span><span class="p">...]</span><span class="nf">)</span><span class="w"></span> | |
| </pre></div> | |
| </div> | |
| <p>Adds the paths in which the linker should search for libraries. | |
| Relative paths given to this command are interpreted as relative to | |
| the current source directory, see <span class="target" id="index-0-policy:CMP0015"></span><a class="reference internal" href="../policy/CMP0015.html#policy:CMP0015" title="CMP0015"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0015</span></code></a>.</p> | |
| <p>The command will apply only to targets created after it is called.</p> | |
| <div class="versionadded"> | |
| <p><span class="versionmodified added">New in version 3.13: </span>The directories are added to the <span class="target" id="index-0-prop_dir:LINK_DIRECTORIES"></span><a class="reference internal" href="../prop_dir/LINK_DIRECTORIES.html#prop_dir:LINK_DIRECTORIES" title="LINK_DIRECTORIES"><code class="xref cmake cmake-prop_dir docutils literal notranslate"><span class="pre">LINK_DIRECTORIES</span></code></a> directory | |
| property for the current <code class="docutils literal notranslate"><span class="pre">CMakeLists.txt</span></code> file, converting relative | |
| paths to absolute as needed. See the <span class="target" id="index-0-manual:cmake-buildsystem(7)"></span><a class="reference internal" href="../manual/cmake-buildsystem.7.html#manual:cmake-buildsystem(7)" title="cmake-buildsystem(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-buildsystem(7)</span></code></a> | |
| manual for more on defining buildsystem properties.</p> | |
| </div> | |
| <div class="versionadded"> | |
| <p><span class="versionmodified added">New in version 3.13: </span>By default the directories specified are appended onto the current list of | |
| directories. This default behavior can be changed by setting | |
| <span class="target" id="index-0-variable:CMAKE_LINK_DIRECTORIES_BEFORE"></span><a class="reference internal" href="../variable/CMAKE_LINK_DIRECTORIES_BEFORE.html#variable:CMAKE_LINK_DIRECTORIES_BEFORE" title="CMAKE_LINK_DIRECTORIES_BEFORE"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_LINK_DIRECTORIES_BEFORE</span></code></a> to <code class="docutils literal notranslate"><span class="pre">ON</span></code>. By using | |
| <code class="docutils literal notranslate"><span class="pre">AFTER</span></code> or <code class="docutils literal notranslate"><span class="pre">BEFORE</span></code> explicitly, you can select between appending and | |
| prepending, independent of the default.</p> | |
| </div> | |
| <div class="versionadded"> | |
| <p><span class="versionmodified added">New in version 3.13: </span>Arguments to <code class="docutils literal notranslate"><span class="pre">link_directories</span></code> may use "generator expressions" with | |
| the syntax "$<...>". See the <span class="target" id="index-0-manual:cmake-generator-expressions(7)"></span><a class="reference internal" href="../manual/cmake-generator-expressions.7.html#manual:cmake-generator-expressions(7)" title="cmake-generator-expressions(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-generator-expressions(7)</span></code></a> | |
| manual for available expressions.</p> | |
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| <div class="admonition note"> | |
| <p class="admonition-title">Note</p> | |
| <p>This command is rarely necessary and should be avoided where there are | |
| other choices. Prefer to pass full absolute paths to libraries where | |
| possible, since this ensures the correct library will always be linked. | |
| The <span class="target" id="index-0-command:find_library"></span><a class="reference internal" href="find_library.html#command:find_library" title="find_library"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_library()</span></code></a> command provides the full path, which can | |
| generally be used directly in calls to <span class="target" id="index-0-command:target_link_libraries"></span><a class="reference internal" href="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>. | |
| Situations where a library search path may be needed include:</p> | |
| <ul class="simple"> | |
| <li><p>Project generators like Xcode where the user can switch target | |
| architecture at build time, but a full path to a library cannot | |
| be used because it only provides one architecture (i.e. it is not | |
| a universal binary).</p></li> | |
| <li><p>Libraries may themselves have other private library dependencies | |
| that expect to be found via <code class="docutils literal notranslate"><span class="pre">RPATH</span></code> mechanisms, but some linkers | |
| are not able to fully decode those paths (e.g. due to the presence | |
| of things like <code class="docutils literal notranslate"><span class="pre">$ORIGIN</span></code>).</p></li> | |
| </ul> | |
| <p>If a library search path must be provided, prefer to localize the effect | |
| where possible by using the <span class="target" id="index-0-command:target_link_directories"></span><a class="reference internal" href="target_link_directories.html#command:target_link_directories" title="target_link_directories"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_directories()</span></code></a> command | |
| rather than <code class="docutils literal notranslate"><span class="pre">link_directories()</span></code>. The target-specific command can also | |
| control how the search directories propagate to other dependent targets.</p> | |
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