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| <span id="module:CheckLanguage"></span><h1>CheckLanguage<a class="headerlink" href="#checklanguage" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Check if a language can be enabled</p> |
| <p>Usage:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>check_language(<lang>) |
| </pre></div> |
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| <p>where <code class="docutils literal notranslate"><span class="pre"><lang></span></code> is a language that may be passed to <span class="target" id="index-0-command:enable_language"></span><a class="reference internal" href="../command/enable_language.html#command:enable_language" title="enable_language"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">enable_language()</span></code></a> |
| such as <code class="docutils literal notranslate"><span class="pre">Fortran</span></code>. If <span class="target" id="index-0-variable:CMAKE_<LANG>_COMPILER"></span><a class="reference internal" href="../variable/CMAKE_LANG_COMPILER.html#variable:CMAKE_<LANG>_COMPILER" title="CMAKE_<LANG>_COMPILER"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_COMPILER</span></code></a> is already defined |
| the check does nothing. Otherwise it tries enabling the language in a |
| test project. The result is cached in <span class="target" id="index-1-variable:CMAKE_<LANG>_COMPILER"></span><a class="reference internal" href="../variable/CMAKE_LANG_COMPILER.html#variable:CMAKE_<LANG>_COMPILER" title="CMAKE_<LANG>_COMPILER"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_COMPILER</span></code></a> |
| as the compiler that was found, or <code class="docutils literal notranslate"><span class="pre">NOTFOUND</span></code> if the language cannot be |
| enabled. For CUDA which can have an explicit host compiler, the cache |
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| for compilation (and cleared if it was not).</p> |
| <p>Example:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>check_language(Fortran) |
| if(CMAKE_Fortran_COMPILER) |
| enable_language(Fortran) |
| else() |
| message(STATUS "No Fortran support") |
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