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| <span id="policy:CMP0013"></span><h1>CMP0013<a class="headerlink" href="#cmp0013" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Duplicate binary directories are not allowed.</p> |
| <p>CMake 2.6.3 and below silently permitted add_subdirectory() calls to |
| create the same binary directory multiple times. During build system |
| generation files would be written and then overwritten in the build |
| tree and could lead to strange behavior. CMake 2.6.4 and above |
| explicitly detect duplicate binary directories. CMake 2.6.4 always |
| considers this case an error. In CMake 2.8.0 and above this policy |
| determines whether or not the case is an error. The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for |
| this policy is to allow duplicate binary directories. The NEW |
| behavior for this policy is to disallow duplicate binary directories |
| with an error.</p> |
| <p>This policy was introduced in CMake version 2.8.0. CMake version |
| 3.23.1 warns when the policy is not set and uses <code class="docutils literal notranslate"><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 notranslate"><span class="pre">cmake_policy()</span></code></a> command to set it to <code class="docutils literal notranslate"><span class="pre">OLD</span></code> or <code class="docutils literal notranslate"><span class="pre">NEW</span></code> explicitly.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>The <code class="docutils literal notranslate"><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 notranslate"><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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