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| <div class="section" id="try-compile"> |
| <span id="command:try_compile"></span><h1><a class="toc-backref" href="#id1">try_compile</a><a class="headerlink" href="#try-compile" title="Permalink to this headline">¶</a></h1> |
| <div class="contents topic" id="contents"> |
| <p class="topic-title first">Contents</p> |
| <ul class="simple"> |
| <li><a class="reference internal" href="#try-compile" id="id1">try_compile</a><ul> |
| <li><a class="reference internal" href="#try-compiling-whole-projects" id="id2">Try Compiling Whole Projects</a></li> |
| <li><a class="reference internal" href="#try-compiling-source-files" id="id3">Try Compiling Source Files</a></li> |
| <li><a class="reference internal" href="#other-behavior-settings" id="id4">Other Behavior Settings</a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <p>Try building some code.</p> |
| <div class="section" id="try-compiling-whole-projects"> |
| <h2><a class="toc-backref" href="#id2">Try Compiling Whole Projects</a><a class="headerlink" href="#try-compiling-whole-projects" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">try_compile</span><span class="p">(</span><span class="n">RESULT_VAR</span> <span class="o"><</span><span class="n">bindir</span><span class="o">></span> <span class="o"><</span><span class="n">srcdir</span><span class="o">></span> |
| <span class="o"><</span><span class="n">projectName</span><span class="o">></span> <span class="p">[</span><span class="o"><</span><span class="n">targetName</span><span class="o">></span><span class="p">]</span> <span class="p">[</span><span class="n">CMAKE_FLAGS</span> <span class="o"><</span><span class="n">flags</span><span class="o">>...</span><span class="p">]</span> |
| <span class="p">[</span><span class="n">OUTPUT_VARIABLE</span> <span class="o"><</span><span class="n">var</span><span class="o">></span><span class="p">])</span> |
| </pre></div> |
| </div> |
| <p>Try building a project. The success or failure of the <code class="docutils literal"><span class="pre">try_compile</span></code>, |
| i.e. <code class="docutils literal"><span class="pre">TRUE</span></code> or <code class="docutils literal"><span class="pre">FALSE</span></code> respectively, is returned in <code class="docutils literal"><span class="pre">RESULT_VAR</span></code>.</p> |
| <p>In this form, <code class="docutils literal"><span class="pre"><srcdir></span></code> should contain a complete CMake project with a |
| <code class="docutils literal"><span class="pre">CMakeLists.txt</span></code> file and all sources. The <code class="docutils literal"><span class="pre"><bindir></span></code> and <code class="docutils literal"><span class="pre"><srcdir></span></code> |
| will not be deleted after this command is run. Specify <code class="docutils literal"><span class="pre"><targetName></span></code> to |
| build a specific target instead of the <code class="docutils literal"><span class="pre">all</span></code> or <code class="docutils literal"><span class="pre">ALL_BUILD</span></code> target. See |
| below for the meaning of other options.</p> |
| </div> |
| <div class="section" id="try-compiling-source-files"> |
| <h2><a class="toc-backref" href="#id3">Try Compiling Source Files</a><a class="headerlink" href="#try-compiling-source-files" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">try_compile</span><span class="p">(</span><span class="n">RESULT_VAR</span> <span class="o"><</span><span class="n">bindir</span><span class="o">></span> <span class="o"><</span><span class="n">srcfile</span><span class="o">|</span><span class="n">SOURCES</span> <span class="n">srcfile</span><span class="o">...></span> |
| <span class="p">[</span><span class="n">CMAKE_FLAGS</span> <span class="o"><</span><span class="n">flags</span><span class="o">>...</span><span class="p">]</span> |
| <span class="p">[</span><span class="n">COMPILE_DEFINITIONS</span> <span class="o"><</span><span class="n">defs</span><span class="o">>...</span><span class="p">]</span> |
| <span class="p">[</span><span class="n">LINK_LIBRARIES</span> <span class="o"><</span><span class="n">libs</span><span class="o">>...</span><span class="p">]</span> |
| <span class="p">[</span><span class="n">OUTPUT_VARIABLE</span> <span class="o"><</span><span class="n">var</span><span class="o">></span><span class="p">]</span> |
| <span class="p">[</span><span class="n">COPY_FILE</span> <span class="o"><</span><span class="n">fileName</span><span class="o">></span> <span class="p">[</span><span class="n">COPY_FILE_ERROR</span> <span class="o"><</span><span class="n">var</span><span class="o">></span><span class="p">]]</span> |
| <span class="p">[</span><span class="o"><</span><span class="n">LANG</span><span class="o">></span><span class="n">_STANDARD</span> <span class="o"><</span><span class="n">std</span><span class="o">></span><span class="p">]</span> |
| <span class="p">[</span><span class="o"><</span><span class="n">LANG</span><span class="o">></span><span class="n">_STANDARD_REQUIRED</span> <span class="o"><</span><span class="nb">bool</span><span class="o">></span><span class="p">]</span> |
| <span class="p">[</span><span class="o"><</span><span class="n">LANG</span><span class="o">></span><span class="n">_EXTENSIONS</span> <span class="o"><</span><span class="nb">bool</span><span class="o">></span><span class="p">]</span> |
| <span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Try building an executable from one or more source files. The success or |
| failure of the <code class="docutils literal"><span class="pre">try_compile</span></code>, i.e. <code class="docutils literal"><span class="pre">TRUE</span></code> or <code class="docutils literal"><span class="pre">FALSE</span></code> respectively, is |
| returned in <code class="docutils literal"><span class="pre">RESULT_VAR</span></code>.</p> |
| <p>In this form the user need only supply one or more source files that include a |
| definition for <code class="docutils literal"><span class="pre">main</span></code>. CMake will create a <code class="docutils literal"><span class="pre">CMakeLists.txt</span></code> file to build |
| the source(s) as an executable that looks something like this:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span>add_definitions(<expanded COMPILE_DEFINITIONS from caller>) |
| include_directories(${INCLUDE_DIRECTORIES}) |
| link_directories(${LINK_DIRECTORIES}) |
| add_executable(cmTryCompileExec <srcfile>...) |
| target_link_libraries(cmTryCompileExec ${LINK_LIBRARIES}) |
| </pre></div> |
| </div> |
| <p>The options are:</p> |
| <dl class="docutils"> |
| <dt><code class="docutils literal"><span class="pre">CMAKE_FLAGS</span> <span class="pre"><flags>...</span></code></dt> |
| <dd>Specify flags of the form <code class="docutils literal"><span class="pre">-DVAR:TYPE=VALUE</span></code> to be passed to |
| the <code class="docutils literal"><span class="pre">cmake</span></code> command-line used to drive the test build. |
| The above example shows how values for variables |
| <code class="docutils literal"><span class="pre">INCLUDE_DIRECTORIES</span></code>, <code class="docutils literal"><span class="pre">LINK_DIRECTORIES</span></code>, and <code class="docutils literal"><span class="pre">LINK_LIBRARIES</span></code> |
| are used.</dd> |
| <dt><code class="docutils literal"><span class="pre">COMPILE_DEFINITIONS</span> <span class="pre"><defs>...</span></code></dt> |
| <dd>Specify <code class="docutils literal"><span class="pre">-Ddefinition</span></code> arguments to pass to <code class="docutils literal"><span class="pre">add_definitions</span></code> |
| in the generated test project.</dd> |
| <dt><code class="docutils literal"><span class="pre">COPY_FILE</span> <span class="pre"><fileName></span></code></dt> |
| <dd>Copy the linked executable to the given <code class="docutils literal"><span class="pre"><fileName></span></code>.</dd> |
| <dt><code class="docutils literal"><span class="pre">COPY_FILE_ERROR</span> <span class="pre"><var></span></code></dt> |
| <dd>Use after <code class="docutils literal"><span class="pre">COPY_FILE</span></code> to capture into variable <code class="docutils literal"><span class="pre"><var></span></code> any error |
| message encountered while trying to copy the file.</dd> |
| <dt><code class="docutils literal"><span class="pre">LINK_LIBRARIES</span> <span class="pre"><libs>...</span></code></dt> |
| <dd><p class="first">Specify libraries to be linked in the generated project. |
| The list of libraries may refer to system libraries and to |
| <a class="reference internal" href="../manual/cmake-buildsystem.7.html#imported-targets"><span class="std std-ref">Imported Targets</span></a> from the calling project.</p> |
| <p class="last">If this option is specified, any <code class="docutils literal"><span class="pre">-DLINK_LIBRARIES=...</span></code> value |
| given to the <code class="docutils literal"><span class="pre">CMAKE_FLAGS</span></code> option will be ignored.</p> |
| </dd> |
| <dt><code class="docutils literal"><span class="pre">OUTPUT_VARIABLE</span> <span class="pre"><var></span></code></dt> |
| <dd>Store the output from the build process the given variable.</dd> |
| <dt><code class="docutils literal"><span class="pre"><LANG>_STANDARD</span> <span class="pre"><std></span></code></dt> |
| <dd>Specify the <span class="target" id="index-0-prop_tgt:C_STANDARD"></span><a class="reference internal" href="../prop_tgt/C_STANDARD.html#prop_tgt:C_STANDARD" title="C_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">C_STANDARD</span></code></a>, <span class="target" id="index-0-prop_tgt:CXX_STANDARD"></span><a class="reference internal" href="../prop_tgt/CXX_STANDARD.html#prop_tgt:CXX_STANDARD" title="CXX_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">CXX_STANDARD</span></code></a>, |
| or <span class="target" id="index-0-prop_tgt:CUDA_STANDARD"></span><a class="reference internal" href="../prop_tgt/CUDA_STANDARD.html#prop_tgt:CUDA_STANDARD" title="CUDA_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">CUDA_STANDARD</span></code></a> target property of the generated project.</dd> |
| <dt><code class="docutils literal"><span class="pre"><LANG>_STANDARD_REQUIRED</span> <span class="pre"><bool></span></code></dt> |
| <dd>Specify the <span class="target" id="index-0-prop_tgt:C_STANDARD_REQUIRED"></span><a class="reference internal" href="../prop_tgt/C_STANDARD_REQUIRED.html#prop_tgt:C_STANDARD_REQUIRED" title="C_STANDARD_REQUIRED"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">C_STANDARD_REQUIRED</span></code></a>, |
| <span class="target" id="index-0-prop_tgt:CXX_STANDARD_REQUIRED"></span><a class="reference internal" href="../prop_tgt/CXX_STANDARD_REQUIRED.html#prop_tgt:CXX_STANDARD_REQUIRED" title="CXX_STANDARD_REQUIRED"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">CXX_STANDARD_REQUIRED</span></code></a>, or <span class="target" id="index-0-prop_tgt:CUDA_STANDARD_REQUIRED"></span><a class="reference internal" href="../prop_tgt/CUDA_STANDARD_REQUIRED.html#prop_tgt:CUDA_STANDARD_REQUIRED" title="CUDA_STANDARD_REQUIRED"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">CUDA_STANDARD_REQUIRED</span></code></a> |
| target property of the generated project.</dd> |
| <dt><code class="docutils literal"><span class="pre"><LANG>_EXTENSIONS</span> <span class="pre"><bool></span></code></dt> |
| <dd>Specify the <span class="target" id="index-0-prop_tgt:C_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/C_EXTENSIONS.html#prop_tgt:C_EXTENSIONS" title="C_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">C_EXTENSIONS</span></code></a>, <span class="target" id="index-0-prop_tgt:CXX_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/CXX_EXTENSIONS.html#prop_tgt:CXX_EXTENSIONS" title="CXX_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">CXX_EXTENSIONS</span></code></a>, |
| or <span class="target" id="index-0-prop_tgt:CUDA_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/CUDA_EXTENSIONS.html#prop_tgt:CUDA_EXTENSIONS" title="CUDA_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal"><span class="pre">CUDA_EXTENSIONS</span></code></a> target property of the generated project.</dd> |
| </dl> |
| <p>In this version all files in <code class="docutils literal"><span class="pre"><bindir>/CMakeFiles/CMakeTmp</span></code> will be |
| cleaned automatically. For debugging, <code class="docutils literal"><span class="pre">--debug-trycompile</span></code> can be |
| passed to <code class="docutils literal"><span class="pre">cmake</span></code> to avoid this clean. However, multiple sequential |
| <code class="docutils literal"><span class="pre">try_compile</span></code> operations reuse this single output directory. If you use |
| <code class="docutils literal"><span class="pre">--debug-trycompile</span></code>, you can only debug one <code class="docutils literal"><span class="pre">try_compile</span></code> call at a time. |
| The recommended procedure is to protect all <code class="docutils literal"><span class="pre">try_compile</span></code> calls in your |
| project by <code class="docutils literal"><span class="pre">if(NOT</span> <span class="pre">DEFINED</span> <span class="pre">RESULT_VAR)</span></code> logic, configure with cmake |
| all the way through once, then delete the cache entry associated with |
| the try_compile call of interest, and then re-run cmake again with |
| <code class="docutils literal"><span class="pre">--debug-trycompile</span></code>.</p> |
| </div> |
| <div class="section" id="other-behavior-settings"> |
| <h2><a class="toc-backref" href="#id4">Other Behavior Settings</a><a class="headerlink" href="#other-behavior-settings" title="Permalink to this headline">¶</a></h2> |
| <p>If set, the following variables are passed in to the generated |
| try_compile CMakeLists.txt to initialize compile target properties with |
| default values:</p> |
| <ul class="simple"> |
| <li><span class="target" id="index-0-variable:CMAKE_ENABLE_EXPORTS"></span><a class="reference internal" href="../variable/CMAKE_ENABLE_EXPORTS.html#variable:CMAKE_ENABLE_EXPORTS" title="CMAKE_ENABLE_EXPORTS"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_ENABLE_EXPORTS</span></code></a></li> |
| <li><span class="target" id="index-0-variable:CMAKE_LINK_SEARCH_START_STATIC"></span><a class="reference internal" href="../variable/CMAKE_LINK_SEARCH_START_STATIC.html#variable:CMAKE_LINK_SEARCH_START_STATIC" title="CMAKE_LINK_SEARCH_START_STATIC"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_LINK_SEARCH_START_STATIC</span></code></a></li> |
| <li><span class="target" id="index-0-variable:CMAKE_LINK_SEARCH_END_STATIC"></span><a class="reference internal" href="../variable/CMAKE_LINK_SEARCH_END_STATIC.html#variable:CMAKE_LINK_SEARCH_END_STATIC" title="CMAKE_LINK_SEARCH_END_STATIC"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_LINK_SEARCH_END_STATIC</span></code></a></li> |
| <li><span class="target" id="index-0-variable:CMAKE_POSITION_INDEPENDENT_CODE"></span><a class="reference internal" href="../variable/CMAKE_POSITION_INDEPENDENT_CODE.html#variable:CMAKE_POSITION_INDEPENDENT_CODE" title="CMAKE_POSITION_INDEPENDENT_CODE"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_POSITION_INDEPENDENT_CODE</span></code></a></li> |
| </ul> |
| <p>If <span class="target" id="index-0-policy:CMP0056"></span><a class="reference internal" href="../policy/CMP0056.html#policy:CMP0056" title="CMP0056"><code class="xref cmake cmake-policy docutils literal"><span class="pre">CMP0056</span></code></a> is set to <code class="docutils literal"><span class="pre">NEW</span></code>, then |
| <span class="target" id="index-0-variable:CMAKE_EXE_LINKER_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_EXE_LINKER_FLAGS.html#variable:CMAKE_EXE_LINKER_FLAGS" title="CMAKE_EXE_LINKER_FLAGS"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_EXE_LINKER_FLAGS</span></code></a> is passed in as well.</p> |
| <p>The current setting of <span class="target" id="index-0-policy:CMP0065"></span><a class="reference internal" href="../policy/CMP0065.html#policy:CMP0065" title="CMP0065"><code class="xref cmake cmake-policy docutils literal"><span class="pre">CMP0065</span></code></a> is set in the generated project.</p> |
| <p>Set the <span class="target" id="index-0-variable:CMAKE_TRY_COMPILE_CONFIGURATION"></span><a class="reference internal" href="../variable/CMAKE_TRY_COMPILE_CONFIGURATION.html#variable:CMAKE_TRY_COMPILE_CONFIGURATION" title="CMAKE_TRY_COMPILE_CONFIGURATION"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_TRY_COMPILE_CONFIGURATION</span></code></a> variable to choose |
| a build configuration.</p> |
| <p>Set the <span class="target" id="index-0-variable:CMAKE_TRY_COMPILE_TARGET_TYPE"></span><a class="reference internal" href="../variable/CMAKE_TRY_COMPILE_TARGET_TYPE.html#variable:CMAKE_TRY_COMPILE_TARGET_TYPE" title="CMAKE_TRY_COMPILE_TARGET_TYPE"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_TRY_COMPILE_TARGET_TYPE</span></code></a> variable to specify |
| the type of target used for the source file signature.</p> |
| <p>Set the <span class="target" id="index-0-variable:CMAKE_TRY_COMPILE_PLATFORM_VARIABLES"></span><a class="reference internal" href="../variable/CMAKE_TRY_COMPILE_PLATFORM_VARIABLES.html#variable:CMAKE_TRY_COMPILE_PLATFORM_VARIABLES" title="CMAKE_TRY_COMPILE_PLATFORM_VARIABLES"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_TRY_COMPILE_PLATFORM_VARIABLES</span></code></a> variable to specify |
| variables that must be propagated into the test project. This variable is |
| meant for use only in toolchain files.</p> |
| <p>If <span class="target" id="index-0-policy:CMP0067"></span><a class="reference internal" href="../policy/CMP0067.html#policy:CMP0067" title="CMP0067"><code class="xref cmake cmake-policy docutils literal"><span class="pre">CMP0067</span></code></a> is set to <code class="docutils literal"><span class="pre">NEW</span></code>, or any of the <code class="docutils literal"><span class="pre"><LANG>_STANDARD</span></code>, |
| <code class="docutils literal"><span class="pre"><LANG>_STANDARD_REQUIRED</span></code>, or <code class="docutils literal"><span class="pre"><LANG>_EXTENSIONS</span></code> options are used, |
| then the language standard variables are honored:</p> |
| <ul class="simple"> |
| <li><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"><span class="pre">CMAKE_C_STANDARD</span></code></a></li> |
| <li><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"><span class="pre">CMAKE_C_STANDARD_REQUIRED</span></code></a></li> |
| <li><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"><span class="pre">CMAKE_C_EXTENSIONS</span></code></a></li> |
| <li><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"><span class="pre">CMAKE_CXX_STANDARD</span></code></a></li> |
| <li><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"><span class="pre">CMAKE_CXX_STANDARD_REQUIRED</span></code></a></li> |
| <li><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"><span class="pre">CMAKE_CXX_EXTENSIONS</span></code></a></li> |
| <li><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"><span class="pre">CMAKE_CUDA_STANDARD</span></code></a></li> |
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| <p>Their values are used to set the corresponding target properties in |
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