| |
| <!DOCTYPE html> |
| |
| <html lang="en"> |
| <head> |
| <meta charset="utf-8" /> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> |
| <title>CheckFunctionExists — CMake 3.23.1 Documentation</title> |
| |
| <link rel="stylesheet" type="text/css" href="../_static/pygments.css" /> |
| <link rel="stylesheet" type="text/css" href="../_static/cmake.css" /> |
| |
| <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script> |
| <script src="../_static/jquery.js"></script> |
| <script src="../_static/underscore.js"></script> |
| <script src="../_static/doctools.js"></script> |
| |
| <link rel="shortcut icon" href="../_static/cmake-favicon.ico"/> |
| <link rel="index" title="Index" href="../genindex.html" /> |
| <link rel="search" title="Search" href="../search.html" /> |
| <link rel="next" title="CheckIncludeFileCXX" href="CheckIncludeFileCXX.html" /> |
| <link rel="prev" title="CheckFortranSourceRuns" href="CheckFortranSourceRuns.html" /> |
| |
| |
| </head><body> |
| |
| <div class="related" role="navigation" aria-label="related navigation"> |
| <h3>Navigation</h3> |
| <ul> |
| <li class="right" style="margin-right: 10px"> |
| <a href="../genindex.html" title="General Index" |
| accesskey="I">index</a></li> |
| <li class="right" > |
| <a href="CheckIncludeFileCXX.html" title="CheckIncludeFileCXX" |
| accesskey="N">next</a> |</li> |
| <li class="right" > |
| <a href="CheckFortranSourceRuns.html" title="CheckFortranSourceRuns" |
| accesskey="P">previous</a> |</li> |
| <li> |
| <img src="../_static/cmake-logo-16.png" alt="" |
| style="vertical-align: middle; margin-top: -2px" /> |
| </li> |
| <li> |
| <a href="https://cmake.org/">CMake</a> » |
| </li> |
| <li> |
| <a href="../index.html">3.23.1 Documentation</a> » |
| </li> |
| |
| <li class="nav-item nav-item-1"><a href="../manual/cmake-modules.7.html" accesskey="U">cmake-modules(7)</a> »</li> |
| <li class="nav-item nav-item-this"><a href="">CheckFunctionExists</a></li> |
| </ul> |
| </div> |
| |
| <div class="document"> |
| <div class="documentwrapper"> |
| <div class="bodywrapper"> |
| <div class="body" role="main"> |
| |
| <div class="section" id="checkfunctionexists"> |
| <span id="module:CheckFunctionExists"></span><h1>CheckFunctionExists<a class="headerlink" href="#checkfunctionexists" title="Permalink to this headline">¶</a></h1> |
| <p>Check if a C function can be linked</p> |
| <dl class="cmake command"> |
| <dt class="sig sig-object cmake" id="command:check_function_exists"> |
| <span class="sig-name descname"><span class="pre">check_function_exists</span></span><a class="headerlink" href="#command:check_function_exists" title="Permalink to this definition">¶</a></dt> |
| <dd><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">check_function_exists(</span><span class="nv"><function></span><span class="w"> </span><span class="nv"><variable></span><span class="nf">)</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>Checks that the <code class="docutils literal notranslate"><span class="pre"><function></span></code> is provided by libraries on the system and store |
| the result in a <code class="docutils literal notranslate"><span class="pre"><variable></span></code>, which will be created as an internal |
| cache variable.</p> |
| </dd></dl> |
| |
| <p>The following variables may be set before calling this macro to modify the |
| way the check is run:</p> |
| <dl> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_FLAGS</span></code></dt><dd><p>string of compile command line flags.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_DEFINITIONS</span></code></dt><dd><p>a <a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">;-list</span></a> of macros to define (-DFOO=bar).</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_INCLUDES</span></code></dt><dd><p>a <a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">;-list</span></a> of header search paths to pass to |
| the compiler.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_LINK_OPTIONS</span></code></dt><dd><div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.14: </span>a <a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">;-list</span></a> of options to add to the link command.</p> |
| </div> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_LIBRARIES</span></code></dt><dd><p>a <a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">;-list</span></a> of libraries to add to the link |
| command. See policy <span class="target" id="index-0-policy:CMP0075"></span><a class="reference internal" href="../policy/CMP0075.html#policy:CMP0075" title="CMP0075"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0075</span></code></a>.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_QUIET</span></code></dt><dd><div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.1: </span>execute quietly without messages.</p> |
| </div> |
| </dd> |
| </dl> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Prefer using <span class="target" id="index-0-module:CheckSymbolExists"></span><a class="reference internal" href="CheckSymbolExists.html#module:CheckSymbolExists" title="CheckSymbolExists"><code class="xref cmake cmake-module docutils literal notranslate"><span class="pre">CheckSymbolExists</span></code></a> instead of this module, |
| for the following reasons:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">check_function_exists()</span></code> can't detect functions that are inlined |
| in headers or specified as a macro.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">check_function_exists()</span></code> can't detect anything in the 32-bit |
| versions of the Win32 API, because of a mismatch in calling conventions.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">check_function_exists()</span></code> only verifies linking, it does not verify |
| that the function is declared in system headers.</p></li> |
| </ul> |
| </div> |
| </div> |
| |
| |
| <div class="clearer"></div> |
| </div> |
| </div> |
| </div> |
| <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> |
| <div class="sphinxsidebarwrapper"> |
| <h4>Previous topic</h4> |
| <p class="topless"><a href="CheckFortranSourceRuns.html" |
| title="previous chapter">CheckFortranSourceRuns</a></p> |
| <h4>Next topic</h4> |
| <p class="topless"><a href="CheckIncludeFileCXX.html" |
| title="next chapter">CheckIncludeFileCXX</a></p> |
| <div role="note" aria-label="source link"> |
| <h3>This Page</h3> |
| <ul class="this-page-menu"> |
| <li><a href="../_sources/module/CheckFunctionExists.rst.txt" |
| rel="nofollow">Show Source</a></li> |
| </ul> |
| </div> |
| <div id="searchbox" style="display: none" role="search"> |
| <h3 id="searchlabel">Quick search</h3> |
| <div class="searchformwrapper"> |
| <form class="search" action="../search.html" method="get"> |
| <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/> |
| <input type="submit" value="Go" /> |
| </form> |
| </div> |
| </div> |
| <script>$('#searchbox').show(0);</script> |
| </div> |
| </div> |
| <div class="clearer"></div> |
| </div> |
| <div class="related" role="navigation" aria-label="related navigation"> |
| <h3>Navigation</h3> |
| <ul> |
| <li class="right" style="margin-right: 10px"> |
| <a href="../genindex.html" title="General Index" |
| >index</a></li> |
| <li class="right" > |
| <a href="CheckIncludeFileCXX.html" title="CheckIncludeFileCXX" |
| >next</a> |</li> |
| <li class="right" > |
| <a href="CheckFortranSourceRuns.html" title="CheckFortranSourceRuns" |
| >previous</a> |</li> |
| <li> |
| <img src="../_static/cmake-logo-16.png" alt="" |
| style="vertical-align: middle; margin-top: -2px" /> |
| </li> |
| <li> |
| <a href="https://cmake.org/">CMake</a> » |
| </li> |
| <li> |
| <a href="../index.html">3.23.1 Documentation</a> » |
| </li> |
| |
| <li class="nav-item nav-item-1"><a href="../manual/cmake-modules.7.html" >cmake-modules(7)</a> »</li> |
| <li class="nav-item nav-item-this"><a href="">CheckFunctionExists</a></li> |
| </ul> |
| </div> |
| |
| <div class="footer" role="contentinfo"> |
| © Copyright 2000-2022 Kitware, Inc. and Contributors. |
| Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.1.2. |
| </div> |
| </body> |
| </html> |