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| <div class="section" id="cmp0067"> |
| <span id="policy:CMP0067"></span><h1>CMP0067<a class="headerlink" href="#cmp0067" title="Permalink to this headline">ΒΆ</a></h1> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.8.</span></p> |
| </div> |
| <p>Honor language standard in <span class="target" id="index-0-command:try_compile"></span><a class="reference internal" href="../command/try_compile.html#command:try_compile" title="try_compile"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_compile()</span></code></a> source-file signature.</p> |
| <p>The <span class="target" id="index-1-command:try_compile"></span><a class="reference internal" href="../command/try_compile.html#command:try_compile" title="try_compile"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_compile()</span></code></a> source file signature is intended to allow |
| callers to check whether they will be able to compile a given source file |
| with the current toolchain. In order to match compiler behavior, any |
| language standard mode should match. However, CMake 3.7 and below did not |
| do this. CMake 3.8 and above prefer to honor the language standard settings |
| for <code class="docutils literal notranslate"><span class="pre">C</span></code>, <code class="docutils literal notranslate"><span class="pre">CXX</span></code> (C++), and <code class="docutils literal notranslate"><span class="pre">CUDA</span></code> using the values of the variables:</p> |
| <ul class="simple"> |
| <li><p><span class="target" id="index-0-variable:CMAKE_C_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_C_STANDARD.html#variable:CMAKE_C_STANDARD" title="CMAKE_C_STANDARD"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_STANDARD</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_C_STANDARD_REQUIRED"></span><a class="reference internal" href="../variable/CMAKE_C_STANDARD_REQUIRED.html#variable:CMAKE_C_STANDARD_REQUIRED" title="CMAKE_C_STANDARD_REQUIRED"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_STANDARD_REQUIRED</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_C_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_C_EXTENSIONS.html#variable:CMAKE_C_EXTENSIONS" title="CMAKE_C_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_C_EXTENSIONS</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_CXX_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_CXX_STANDARD.html#variable:CMAKE_CXX_STANDARD" title="CMAKE_CXX_STANDARD"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_STANDARD</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_CXX_STANDARD_REQUIRED"></span><a class="reference internal" href="../variable/CMAKE_CXX_STANDARD_REQUIRED.html#variable:CMAKE_CXX_STANDARD_REQUIRED" title="CMAKE_CXX_STANDARD_REQUIRED"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_STANDARD_REQUIRED</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_CXX_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_CXX_EXTENSIONS.html#variable:CMAKE_CXX_EXTENSIONS" title="CMAKE_CXX_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_EXTENSIONS</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_CUDA_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_CUDA_STANDARD.html#variable:CMAKE_CUDA_STANDARD" title="CMAKE_CUDA_STANDARD"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CUDA_STANDARD</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_CUDA_STANDARD_REQUIRED"></span><a class="reference internal" href="../variable/CMAKE_CUDA_STANDARD_REQUIRED.html#variable:CMAKE_CUDA_STANDARD_REQUIRED" title="CMAKE_CUDA_STANDARD_REQUIRED"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CUDA_STANDARD_REQUIRED</span></code></a></p></li> |
| <li><p><span class="target" id="index-0-variable:CMAKE_CUDA_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_CUDA_EXTENSIONS.html#variable:CMAKE_CUDA_EXTENSIONS" title="CMAKE_CUDA_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CUDA_EXTENSIONS</span></code></a></p></li> |
| </ul> |
| <p>This policy provides compatibility for projects that do not expect |
| the language standard settings to be used automatically.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of this policy is to ignore language standard |
| setting variables when generating the <code class="docutils literal notranslate"><span class="pre">try_compile</span></code> test project. |
| The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior of this policy is to honor language standard |
| setting variables.</p> |
| <p>This policy was introduced in CMake version 3.8. Unlike most policies, |
| CMake version 3.23.1 does <em>not</em> warn by default when this policy |
| is not set and simply uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior. See documentation of the |
| <span class="target" id="index-0-variable:CMAKE_POLICY_WARNING_CMP<NNNN>"></span><a class="reference internal" href="../variable/CMAKE_POLICY_WARNING_CMPNNNN.html#variable:CMAKE_POLICY_WARNING_CMP<NNNN>" title="CMAKE_POLICY_WARNING_CMP<NNNN>"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_POLICY_WARNING_CMP0067</span></code></a> |
| variable to control the warning.</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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