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| <span id="policy:CMP0127"></span><h1>CMP0127<a class="headerlink" href="#cmp0127" title="Permalink to this headline">ΒΆ</a></h1> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.22.</span></p> |
| </div> |
| <p><span class="target" id="index-0-command:cmake_dependent_option"></span><a class="reference internal" href="../module/CMakeDependentOption.html#command:cmake_dependent_option" title="cmake_dependent_option"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_dependent_option()</span></code></a> supports full <a class="reference internal" href="../command/if.html#condition-syntax"><span class="std std-ref">Condition Syntax</span></a>.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre"><depends></span></code> parameter accepts a <a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">semicolon-separated list</span></a> of conditions. CMake 3.21 and lower evaluates each |
| <code class="docutils literal notranslate"><span class="pre">condition</span></code> as <code class="docutils literal notranslate"><span class="pre">if(${condition})</span></code>, which does not properly handle |
| conditions with nested paren groups. CMake 3.22 and above instead prefer |
| to evaluate each <code class="docutils literal notranslate"><span class="pre">condition</span></code> as <code class="docutils literal notranslate"><span class="pre">if(<condition>)</span></code>, where <code class="docutils literal notranslate"><span class="pre"><condition></span></code> |
| is re-parsed as if literally written in a call to <span class="target" id="index-0-command:if"></span><a class="reference internal" href="../command/if.html#command:if" title="if"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">if()</span></code></a>. This |
| allows expressions like:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>"A AND (B OR C)" |
| </pre></div> |
| </div> |
| <p>but requires expressions like:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>"FOO MATCHES (UPPER|lower)" |
| </pre></div> |
| </div> |
| <p>to be re-written as:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>"FOO MATCHES \"(UPPER|lower)\"" |
| </pre></div> |
| </div> |
| <p>Policy <code class="docutils literal notranslate"><span class="pre">CMP0127</span></code> provides compatibility for projects that have not |
| been updated to expect the new behavior.</p> |
| <p>This policy was introduced in CMake version 3.22. 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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