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<div class="section" id="cmp0040">
<span id="policy:CMP0040"></span><h1>CMP0040<a class="headerlink" href="#cmp0040" title="Permalink to this headline">ΒΆ</a></h1>
<p>The target in the <code class="docutils literal"><span class="pre">TARGET</span></code> signature of <span class="target" id="index-0-command:add_custom_command"></span><a class="reference internal" href="../command/add_custom_command.html#command:add_custom_command" title="add_custom_command"><code class="xref cmake cmake-command docutils literal"><span class="pre">add_custom_command()</span></code></a>
must exist and must be defined in current directory.</p>
<p>CMake 2.8.12 and lower silently ignored a custom command created with
the <code class="docutils literal"><span class="pre">TARGET</span></code> signature of <span class="target" id="index-1-command:add_custom_command"></span><a class="reference internal" href="../command/add_custom_command.html#command:add_custom_command" title="add_custom_command"><code class="xref cmake cmake-command docutils literal"><span class="pre">add_custom_command()</span></code></a>
if the target is unknown or was defined outside the current directory.</p>
<p>The <code class="docutils literal"><span class="pre">OLD</span></code> behavior for this policy is to ignore custom commands
for unknown targets. The <code class="docutils literal"><span class="pre">NEW</span></code> behavior for this policy is to report
an error if the target referenced in <span class="target" id="index-2-command:add_custom_command"></span><a class="reference internal" href="../command/add_custom_command.html#command:add_custom_command" title="add_custom_command"><code class="xref cmake cmake-command docutils literal"><span class="pre">add_custom_command()</span></code></a> is
unknown or was defined outside the current directory.</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 <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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