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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">¶</a></h1>
 <p>Double colon in target name means ALIAS or IMPORTED target.</p>
 <p>CMake 2.8.12 and lower allowed the use of targets and files with double
 colons in target_link_libraries, with some buildsystem generators.</p>
 <p>The use of double-colons is a common pattern used to namespace IMPORTED
 targets and ALIAS 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>The OLD behavior for this policy is to search for targets, then files on disk,
 even if the search term contains double-colons.  The NEW behavior for this
 policy is to issue a FATAL_ERROR if a link dependency contains
 double-colons but is not an IMPORTED target or an ALIAS target.</p>
 <p>This policy was introduced in CMake version 3.0.  CMake version
 3.8.2 warns when the policy is not set and uses OLD behavior.  Use
 the cmake_policy command to set it to OLD or NEW 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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	<div class="section" id="cmp0028">
	<span id="policy:CMP0028"></span><h1>CMP0028<a class="headerlink" href="#cmp0028" title="Permalink to this headline">¶</a></h1>
	<p>Double colon in target name means ALIAS or IMPORTED target.</p>
	<p>CMake 2.8.12 and lower allowed the use of targets and files with double
	colons in target_link_libraries, with some buildsystem generators.</p>
	<p>The use of double-colons is a common pattern used to namespace IMPORTED
	targets and ALIAS 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>The OLD behavior for this policy is to search for targets, then files on disk,
	even if the search term contains double-colons. The NEW behavior for this
	policy is to issue a FATAL_ERROR if a link dependency contains
	double-colons but is not an IMPORTED target or an ALIAS target.</p>
	<p>This policy was introduced in CMake version 3.0. CMake version
	3.8.2 warns when the policy is not set and uses OLD behavior. Use
	the cmake_policy command to set it to OLD or NEW 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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