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| <span id="policy:CMP0004"></span><h1>CMP0004<a class="headerlink" href="#cmp0004" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Libraries linked may not have leading or trailing whitespace.</p> |
| <p>CMake versions 2.4 and below silently removed leading and trailing |
| whitespace from libraries linked with code like</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>target_link_libraries(myexe " A ") |
| </pre></div> |
| </div> |
| <p>This could lead to subtle errors in user projects.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to silently remove leading and |
| trailing whitespace. The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior for this policy is to diagnose |
| the existence of such whitespace as an error. The setting for this |
| policy used when checking the library names is that in effect when the |
| target is created by an <span class="target" id="index-0-command:add_executable"></span><a class="reference internal" href="../command/add_executable.html#command:add_executable" title="add_executable"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_executable()</span></code></a> or <span class="target" id="index-0-command:add_library"></span><a class="reference internal" href="../command/add_library.html#command:add_library" title="add_library"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_library()</span></code></a> |
| command.</p> |
| <p>This policy was introduced in CMake version 2.6.0. 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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