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| <span id="policy:CMP0049"></span><h1>CMP0049<a class="headerlink" href="#cmp0049" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Do not expand variables in target source entries.</p> |
| <p>CMake 2.8.12 and lower performed and extra layer of variable expansion |
| when evaluating source file names:</p> |
| <div class="highlight-cmake"><div class="highlight"><pre><span></span><span class="nb">set</span><span class="p">(</span><span class="s">a_source</span> <span class="s">foo.c</span><span class="p">)</span> |
| <span class="nb">add_executable</span><span class="p">(</span><span class="s">foo</span> <span class="s">\${a_source})</span> |
| </pre></div> |
| </div> |
| <p>This was undocumented behavior.</p> |
| <p>The OLD behavior for this policy is to expand such variables when processing |
| the target sources. The NEW behavior for this policy is to issue an error |
| if such variables need to be expanded.</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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