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| <div class="section" id="checkobjcxxsourceruns"> | |
| <span id="module:CheckOBJCXXSourceRuns"></span><h1>CheckOBJCXXSourceRuns<a class="headerlink" href="#checkobjcxxsourceruns" title="Permalink to this headline">¶</a></h1> | |
| <div class="versionadded"> | |
| <p><span class="versionmodified added">New in version 3.16.</span></p> | |
| </div> | |
| <p>Check if given Objective-C++ source compiles and links into an executable and can | |
| subsequently be run.</p> | |
| <dl class="command"> | |
| <dt id="command:check_objcxx_source_runs"> | |
| <code class="sig-name descname">check_objcxx_source_runs</code><a class="headerlink" href="#command:check_objcxx_source_runs" title="Permalink to this definition">¶</a></dt> | |
| <dd><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">check_objcxx_source_runs(</span><span class="nv"><code></span><span class="w"> </span><span class="nv"><resultVar></span><span class="nf">)</span><span class="w"></span> | |
| </pre></div> | |
| </div> | |
| <p>Check that the source supplied in <code class="docutils literal notranslate"><span class="pre"><code></span></code> can be compiled as a Objective-C++ source | |
| file, linked as an executable and then run. The <code class="docutils literal notranslate"><span class="pre"><code></span></code> must contain at | |
| least a <code class="docutils literal notranslate"><span class="pre">main()</span></code> function. If the <code class="docutils literal notranslate"><span class="pre"><code></span></code> could be built and run | |
| successfully, the internal cache variable specified by <code class="docutils literal notranslate"><span class="pre"><resultVar></span></code> will | |
| be set to 1, otherwise it will be set to an value that evaluates to boolean | |
| false (e.g. an empty string or an error message).</p> | |
| <p>The underlying check is performed by the <span class="target" id="index-0-command:try_run"></span><a class="reference internal" href="../command/try_run.html#command:try_run" title="try_run"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_run()</span></code></a> command. The | |
| compile and link commands can be influenced by setting any of the following | |
| variables prior to calling <code class="docutils literal notranslate"><span class="pre">check_objcxx_source_runs()</span></code>:</p> | |
| <dl class="simple"> | |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_FLAGS</span></code></dt><dd><p>Additional flags to pass to the compiler. Note that the contents of | |
| <span class="target" id="index-0-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_OBJCXX_FLAGS</span></code></a> and its associated | |
| configuration-specific variable are automatically added to the compiler | |
| command before the contents of <code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_FLAGS</span></code>.</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 compiler definitions of the form | |
| <code class="docutils literal notranslate"><span class="pre">-DFOO</span></code> or <code class="docutils literal notranslate"><span class="pre">-DFOO=bar</span></code>. A definition for the name specified by | |
| <code class="docutils literal notranslate"><span class="pre"><resultVar></span></code> will also be added automatically.</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. These will be the only header search paths used by | |
| <code class="docutils literal notranslate"><span class="pre">try_run()</span></code>, i.e. the contents of the <span class="target" id="index-0-prop_dir:INCLUDE_DIRECTORIES"></span><a class="reference internal" href="../prop_dir/INCLUDE_DIRECTORIES.html#prop_dir:INCLUDE_DIRECTORIES" title="INCLUDE_DIRECTORIES"><code class="xref cmake cmake-prop_dir docutils literal notranslate"><span class="pre">INCLUDE_DIRECTORIES</span></code></a> | |
| directory property will be ignored.</p> | |
| </dd> | |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_LINK_OPTIONS</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 options to add to the link | |
| command (see <span class="target" id="index-1-command:try_run"></span><a class="reference internal" href="../command/try_run.html#command:try_run" title="try_run"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_run()</span></code></a> for further details).</p> | |
| </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. These can be the name of system libraries or they can be | |
| <a class="reference internal" href="../manual/cmake-buildsystem.7.html#imported-targets"><span class="std std-ref">Imported Targets</span></a> (see <span class="target" id="index-2-command:try_run"></span><a class="reference internal" href="../command/try_run.html#command:try_run" title="try_run"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_run()</span></code></a> for | |
| further details).</p> | |
| </dd> | |
| <dt><code class="docutils literal notranslate"><span class="pre">CMAKE_REQUIRED_QUIET</span></code></dt><dd><p>If this variable evaluates to a boolean true value, all status messages | |
| associated with the check will be suppressed.</p> | |
| </dd> | |
| </dl> | |
| <p>The check is only performed once, with the result cached in the variable | |
| named by <code class="docutils literal notranslate"><span class="pre"><resultVar></span></code>. Every subsequent CMake run will re-use this cached | |
| value rather than performing the check again, even if the <code class="docutils literal notranslate"><span class="pre"><code></span></code> changes. | |
| In order to force the check to be re-evaluated, the variable named by | |
| <code class="docutils literal notranslate"><span class="pre"><resultVar></span></code> must be manually removed from the cache.</p> | |
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