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<section id="link-library-override-library">
<span id="prop_tgt:LINK_LIBRARY_OVERRIDE_<LIBRARY>"></span><h1>LINK_LIBRARY_OVERRIDE_<LIBRARY><a class="headerlink" href="#link-library-override-library" title="Permalink to this heading">ΒΆ</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.24.</span></p>
</div>
<p>Override the library feature associated with <code class="docutils literal notranslate"><span class="pre"><LIBRARY></span></code> from
<span class="target" id="index-0-genex:LINK_LIBRARY"></span><a class="reference internal" href="../manual/cmake-generator-expressions.7.html#genex:LINK_LIBRARY" title="LINK_LIBRARY"><code class="xref cmake cmake-genex docutils literal notranslate"><span class="pre">LINK_LIBRARY</span></code></a> generator expressions. This can be used to resolve
incompatible library features that result from specifying different features
for <code class="docutils literal notranslate"><span class="pre"><LIBRARY></span></code> in different <span class="target" id="index-1-genex:LINK_LIBRARY"></span><a class="reference internal" href="../manual/cmake-generator-expressions.7.html#genex:LINK_LIBRARY" title="LINK_LIBRARY"><code class="xref cmake cmake-genex docutils literal notranslate"><span class="pre">LINK_LIBRARY</span></code></a> generator expressions.</p>
<p>When set on a target, this property holds a single library feature name, which
will be applied to <code class="docutils literal notranslate"><span class="pre"><LIBRARY></span></code> when linking that target.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">add_library(</span><span class="nb">lib1</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
<span class="nf">add_library(</span><span class="nb">lib2</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
<span class="nf">add_library(</span><span class="nb">lib3</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
<span class="nf">target_link_libraries(</span><span class="nb">lib1</span><span class="w"> </span><span class="no">PUBLIC</span><span class="w"> </span><span class="s">"$<LINK_LIBRARY:feature1,external>"</span><span class="nf">)</span><span class="w"></span>
<span class="nf">target_link_libraries(</span><span class="nb">lib2</span><span class="w"> </span><span class="no">PUBLIC</span><span class="w"> </span><span class="s">"$<LINK_LIBRARY:feature2,lib1>"</span><span class="nf">)</span><span class="w"></span>
<span class="nf">target_link_libraries(</span><span class="nb">lib3</span><span class="w"> </span><span class="no">PRIVATE</span><span class="w"> </span><span class="nb">lib1</span><span class="w"> </span><span class="nb">lib2</span><span class="nf">)</span><span class="w"></span>
<span class="c"># lib1 is associated with both feature2 and no feature. Without any override,</span>
<span class="c"># this would result in a fatal error at generation time for lib3.</span>
<span class="c"># Define an override to resolve the incompatible feature associations.</span>
<span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">lib3</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="nb">LINK_LIBRARY_OVERRIDE_lib1</span><span class="w"> </span><span class="nb">feature2</span><span class="nf">)</span><span class="w"></span>
<span class="c"># lib1 will now be associated with feature2 instead when linking lib3</span>
</pre></div>
</div>
<p>It is also possible to override any feature with the pre-defined <code class="docutils literal notranslate"><span class="pre">DEFAULT</span></code>
library feature. This effectively discards any feature for that link item,
for that target only (<code class="docutils literal notranslate"><span class="pre">lib3</span></code> in this example):</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="c"># When linking lib3, discard any library feature for lib1</span>
<span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">lib3</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="nb">LINK_LIBRARY_OVERRIDE_lib1</span><span class="w"> </span><span class="no">DEFAULT</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>See the <span class="target" id="index-0-prop_tgt:LINK_LIBRARY_OVERRIDE"></span><a class="reference internal" href="LINK_LIBRARY_OVERRIDE.html#prop_tgt:LINK_LIBRARY_OVERRIDE" title="LINK_LIBRARY_OVERRIDE"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">LINK_LIBRARY_OVERRIDE</span></code></a> target property for an alternative
way of overriding library features for multiple libraries at once. If both
properties are defined and specify an override for the same link item,
<code class="docutils literal notranslate"><span class="pre">LINK_LIBRARY_OVERRIDE_<LIBRARY></span></code> takes precedence over
<span class="target" id="index-1-prop_tgt:LINK_LIBRARY_OVERRIDE"></span><a class="reference internal" href="LINK_LIBRARY_OVERRIDE.html#prop_tgt:LINK_LIBRARY_OVERRIDE" title="LINK_LIBRARY_OVERRIDE"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">LINK_LIBRARY_OVERRIDE</span></code></a>.</p>
<p>Contents of <code class="docutils literal notranslate"><span class="pre">LINK_LIBRARY_OVERRIDE_<LIBRARY></span></code> may use
<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">generator</span> <span class="pre">expressions</span></code></a>.</p>
<p>For more information about library features, see the
<span class="target" id="index-0-variable:CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>"></span><a class="reference internal" href="../variable/CMAKE_LANG_LINK_LIBRARY_USING_FEATURE.html#variable:CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>" title="CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE></span></code></a> and
<span class="target" id="index-0-variable:CMAKE_LINK_LIBRARY_USING_<FEATURE>"></span><a class="reference internal" href="../variable/CMAKE_LINK_LIBRARY_USING_FEATURE.html#variable:CMAKE_LINK_LIBRARY_USING_<FEATURE>" title="CMAKE_LINK_LIBRARY_USING_<FEATURE>"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_LINK_LIBRARY_USING_<FEATURE></span></code></a> variables.</p>
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