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<span id="policy:CMP0063"></span><h1>CMP0063<a class="headerlink" href="#cmp0063" title="Permalink to this headline">ΒΆ</a></h1>
<p>Honor visibility properties for all target types.</p>
<p>The <span class="target" id="index-0-prop_tgt:&lt;LANG&gt;_VISIBILITY_PRESET"></span><a class="reference internal" href="../prop_tgt/LANG_VISIBILITY_PRESET.html#prop_tgt:&lt;LANG&gt;_VISIBILITY_PRESET" title="&lt;LANG&gt;_VISIBILITY_PRESET"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">&lt;LANG&gt;_VISIBILITY_PRESET</span></code></a> and
<span class="target" id="index-0-prop_tgt:VISIBILITY_INLINES_HIDDEN"></span><a class="reference internal" href="../prop_tgt/VISIBILITY_INLINES_HIDDEN.html#prop_tgt:VISIBILITY_INLINES_HIDDEN" title="VISIBILITY_INLINES_HIDDEN"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">VISIBILITY_INLINES_HIDDEN</span></code></a> target properties affect visibility
of symbols during dynamic linking. When first introduced these properties
affected compilation of sources only in shared libraries, module libraries,
and executables with the <span class="target" id="index-0-prop_tgt:ENABLE_EXPORTS"></span><a class="reference internal" href="../prop_tgt/ENABLE_EXPORTS.html#prop_tgt:ENABLE_EXPORTS" title="ENABLE_EXPORTS"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">ENABLE_EXPORTS</span></code></a> property set. This
was sufficient for the basic use cases of shared libraries and executables
with plugins. However, some sources may be compiled as part of static
libraries or object libraries and then linked into a shared library later.
CMake 3.3 and above prefer to honor these properties for sources compiled
in all target types. This policy preserves compatibility for projects
expecting the properties to work only for some target types.</p>
<p>The <code class="docutils literal"><span class="pre">OLD</span></code> behavior for this policy is to ignore the visibility properties
for static libraries, object libraries, and executables without exports.
The <code class="docutils literal"><span class="pre">NEW</span></code> behavior for this policy is to honor the visibility properties
for all target types.</p>
<p>This policy was introduced in CMake version 3.3. CMake version
3.8.2 warns when the policy is not set and uses <code class="docutils literal"><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"><span class="pre">cmake_policy()</span></code></a> command to set it to <code class="docutils literal"><span class="pre">OLD</span></code> or <code class="docutils literal"><span class="pre">NEW</span></code>
explicitly.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The <code class="docutils literal"><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"><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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