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| <div class="section" id="cmakepackageconfighelpers"> |
| <span id="module:CMakePackageConfigHelpers"></span><h1>CMakePackageConfigHelpers<a class="headerlink" href="#cmakepackageconfighelpers" title="Permalink to this headline">¶</a></h1> |
| <p>Helpers functions for creating config files that can be included by other |
| projects to find and use a package.</p> |
| <p>Adds the <span class="target" id="index-0-command:configure_package_config_file"></span><a class="reference internal" href="#command:configure_package_config_file" title="configure_package_config_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">configure_package_config_file()</span></code></a> and |
| <span class="target" id="index-0-command:write_basic_package_version_file"></span><a class="reference internal" href="#command:write_basic_package_version_file" title="write_basic_package_version_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">write_basic_package_version_file()</span></code></a> commands.</p> |
| <div class="section" id="generating-a-package-configuration-file"> |
| <h2>Generating a Package Configuration File<a class="headerlink" href="#generating-a-package-configuration-file" title="Permalink to this headline">¶</a></h2> |
| <dl class="command"> |
| <dt id="command:configure_package_config_file"> |
| <code class="descname">configure_package_config_file</code><a class="headerlink" href="#command:configure_package_config_file" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Create a config file for a project:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">configure_package_config_file</span><span class="p">(</span><span class="o"><</span><span class="nb">input</span><span class="o">></span> <span class="o"><</span><span class="n">output</span><span class="o">></span> |
| <span class="n">INSTALL_DESTINATION</span> <span class="o"><</span><span class="n">path</span><span class="o">></span> |
| <span class="p">[</span><span class="n">PATH_VARS</span> <span class="o"><</span><span class="n">var1</span><span class="o">></span> <span class="o"><</span><span class="n">var2</span><span class="o">></span> <span class="o">...</span> <span class="o"><</span><span class="n">varN</span><span class="o">></span><span class="p">]</span> |
| <span class="p">[</span><span class="n">NO_SET_AND_CHECK_MACRO</span><span class="p">]</span> |
| <span class="p">[</span><span class="n">NO_CHECK_REQUIRED_COMPONENTS_MACRO</span><span class="p">]</span> |
| <span class="p">[</span><span class="n">INSTALL_PREFIX</span> <span class="o"><</span><span class="n">path</span><span class="o">></span><span class="p">]</span> |
| <span class="p">)</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <p><code class="docutils literal"><span class="pre">configure_package_config_file()</span></code> should be used instead of the plain |
| <span class="target" id="index-0-command:configure_file"></span><a class="reference internal" href="../command/configure_file.html#command:configure_file" title="configure_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">configure_file()</span></code></a> command when creating the <code class="docutils literal"><span class="pre"><Name>Config.cmake</span></code> |
| or <code class="docutils literal"><span class="pre"><Name>-config.cmake</span></code> file for installing a project or library. It helps |
| making the resulting package relocatable by avoiding hardcoded paths in the |
| installed <code class="docutils literal"><span class="pre">Config.cmake</span></code> file.</p> |
| <p>In a <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file there may be code like this to make the install |
| destinations know to the using project:</p> |
| <div class="highlight-cmake"><div class="highlight"><pre><span></span><span class="nb">set</span><span class="p">(</span><span class="s">FOO_INCLUDE_DIR</span> <span class="s2">"@CMAKE_INSTALL_FULL_INCLUDEDIR@"</span> <span class="p">)</span> |
| <span class="nb">set</span><span class="p">(</span><span class="s">FOO_DATA_DIR</span> <span class="s2">"@CMAKE_INSTALL_PREFIX@/@RELATIVE_DATA_INSTALL_DIR@"</span> <span class="p">)</span> |
| <span class="nb">set</span><span class="p">(</span><span class="s">FOO_ICONS_DIR</span> <span class="s2">"@CMAKE_INSTALL_PREFIX@/share/icons"</span> <span class="p">)</span> |
| <span class="c">#...logic to determine installedPrefix from the own location...</span> |
| <span class="nb">set</span><span class="p">(</span><span class="s">FOO_CONFIG_DIR</span> <span class="s2">"${installedPrefix}/@CONFIG_INSTALL_DIR@"</span> <span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>All 4 options shown above are not sufficient, since the first 3 hardcode the |
| absolute directory locations, and the 4th case works only if the logic to |
| determine the <code class="docutils literal"><span class="pre">installedPrefix</span></code> is correct, and if <code class="docutils literal"><span class="pre">CONFIG_INSTALL_DIR</span></code> |
| contains a relative path, which in general cannot be guaranteed. This has the |
| effect that the resulting <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file would work poorly under |
| Windows and OSX, where users are used to choose the install location of a |
| binary package at install time, independent from how |
| <span class="target" id="index-0-variable:CMAKE_INSTALL_PREFIX"></span><a class="reference internal" href="../variable/CMAKE_INSTALL_PREFIX.html#variable:CMAKE_INSTALL_PREFIX" title="CMAKE_INSTALL_PREFIX"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_INSTALL_PREFIX</span></code></a> was set at build/cmake time.</p> |
| <p>Using <code class="docutils literal"><span class="pre">configure_package_config_file</span></code> helps. If used correctly, it makes |
| the resulting <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file relocatable. Usage:</p> |
| <ol class="arabic simple"> |
| <li>write a <code class="docutils literal"><span class="pre">FooConfig.cmake.in</span></code> file as you are used to</li> |
| <li>insert a line containing only the string <code class="docutils literal"><span class="pre">@PACKAGE_INIT@</span></code></li> |
| <li>instead of <code class="docutils literal"><span class="pre">set(FOO_DIR</span> <span class="pre">"@SOME_INSTALL_DIR@")</span></code>, use |
| <code class="docutils literal"><span class="pre">set(FOO_DIR</span> <span class="pre">"@PACKAGE_SOME_INSTALL_DIR@")</span></code> (this must be after the |
| <code class="docutils literal"><span class="pre">@PACKAGE_INIT@</span></code> line)</li> |
| <li>instead of using the normal <span class="target" id="index-1-command:configure_file"></span><a class="reference internal" href="../command/configure_file.html#command:configure_file" title="configure_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">configure_file()</span></code></a>, use |
| <code class="docutils literal"><span class="pre">configure_package_config_file()</span></code></li> |
| </ol> |
| <p>The <code class="docutils literal"><span class="pre"><input></span></code> and <code class="docutils literal"><span class="pre"><output></span></code> arguments are the input and output file, the |
| same way as in <span class="target" id="index-2-command:configure_file"></span><a class="reference internal" href="../command/configure_file.html#command:configure_file" title="configure_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">configure_file()</span></code></a>.</p> |
| <p>The <code class="docutils literal"><span class="pre"><path></span></code> given to <code class="docutils literal"><span class="pre">INSTALL_DESTINATION</span></code> must be the destination where |
| the <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file will be installed to. This path can either be |
| absolute, or relative to the <code class="docutils literal"><span class="pre">INSTALL_PREFIX</span></code> path.</p> |
| <p>The variables <code class="docutils literal"><span class="pre"><var1></span></code> to <code class="docutils literal"><span class="pre"><varN></span></code> given as <code class="docutils literal"><span class="pre">PATH_VARS</span></code> are the |
| variables which contain install destinations. For each of them the macro will |
| create a helper variable <code class="docutils literal"><span class="pre">PACKAGE_<var...></span></code>. These helper variables must be |
| used in the <code class="docutils literal"><span class="pre">FooConfig.cmake.in</span></code> file for setting the installed location. |
| They are calculated by <code class="docutils literal"><span class="pre">configure_package_config_file</span></code> so that they are |
| always relative to the installed location of the package. This works both for |
| relative and also for absolute locations. For absolute locations it works |
| only if the absolute location is a subdirectory of <code class="docutils literal"><span class="pre">INSTALL_PREFIX</span></code>.</p> |
| <p>If the <code class="docutils literal"><span class="pre">INSTALL_PREFIX</span></code> argument is passed, this is used as base path to |
| calculate all the relative paths. The <code class="docutils literal"><span class="pre"><path></span></code> argument must be an absolute |
| path. If this argument is not passed, the <span class="target" id="index-1-variable:CMAKE_INSTALL_PREFIX"></span><a class="reference internal" href="../variable/CMAKE_INSTALL_PREFIX.html#variable:CMAKE_INSTALL_PREFIX" title="CMAKE_INSTALL_PREFIX"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_INSTALL_PREFIX</span></code></a> |
| variable will be used instead. The default value is good when generating a |
| FooConfig.cmake file to use your package from the install tree. When |
| generating a FooConfig.cmake file to use your package from the build tree this |
| option should be used.</p> |
| <p>By default <code class="docutils literal"><span class="pre">configure_package_config_file</span></code> also generates two helper macros, |
| <code class="docutils literal"><span class="pre">set_and_check()</span></code> and <code class="docutils literal"><span class="pre">check_required_components()</span></code> into the |
| <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file.</p> |
| <p><code class="docutils literal"><span class="pre">set_and_check()</span></code> should be used instead of the normal <code class="docutils literal"><span class="pre">set()</span></code> command for |
| setting directories and file locations. Additionally to setting the variable |
| it also checks that the referenced file or directory actually exists and fails |
| with a <code class="docutils literal"><span class="pre">FATAL_ERROR</span></code> otherwise. This makes sure that the created |
| <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file does not contain wrong references. |
| When using the <code class="docutils literal"><span class="pre">NO_SET_AND_CHECK_MACRO</span></code>, this macro is not generated |
| into the <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file.</p> |
| <p><code class="docutils literal"><span class="pre">check_required_components(<package_name>)</span></code> should be called at the end of |
| the <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file if the package supports components. This macro |
| checks whether all requested, non-optional components have been found, and if |
| this is not the case, sets the <code class="docutils literal"><span class="pre">Foo_FOUND</span></code> variable to <code class="docutils literal"><span class="pre">FALSE</span></code>, so that |
| the package is considered to be not found. It does that by testing the |
| <code class="docutils literal"><span class="pre">Foo_<Component>_FOUND</span></code> variables for all requested required components. |
| When using the <code class="docutils literal"><span class="pre">NO_CHECK_REQUIRED_COMPONENTS_MACRO</span></code> option, this macro is |
| not generated into the <code class="docutils literal"><span class="pre">FooConfig.cmake</span></code> file.</p> |
| <p>For an example see below the documentation for |
| <span class="target" id="index-1-command:write_basic_package_version_file"></span><a class="reference internal" href="#command:write_basic_package_version_file" title="write_basic_package_version_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">write_basic_package_version_file()</span></code></a>.</p> |
| </div> |
| <div class="section" id="generating-a-package-version-file"> |
| <h2>Generating a Package Version File<a class="headerlink" href="#generating-a-package-version-file" title="Permalink to this headline">¶</a></h2> |
| <dl class="command"> |
| <dt id="command:write_basic_package_version_file"> |
| <code class="descname">write_basic_package_version_file</code><a class="headerlink" href="#command:write_basic_package_version_file" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Create a version file for a project:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">write_basic_package_version_file</span><span class="p">(</span><span class="o"><</span><span class="n">filename</span><span class="o">></span> |
| <span class="p">[</span><span class="n">VERSION</span> <span class="o"><</span><span class="n">major</span><span class="o">.</span><span class="n">minor</span><span class="o">.</span><span class="n">patch</span><span class="o">></span><span class="p">]</span> |
| <span class="n">COMPATIBILITY</span> <span class="o"><</span><span class="n">AnyNewerVersion</span><span class="o">|</span><span class="n">SameMajorVersion</span><span class="o">|</span><span class="n">ExactVersion</span><span class="o">></span> <span class="p">)</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <p>Writes a file for use as <code class="docutils literal"><span class="pre"><package>ConfigVersion.cmake</span></code> file to |
| <code class="docutils literal"><span class="pre"><filename></span></code>. See the documentation of <span class="target" id="index-0-command:find_package"></span><a class="reference internal" href="../command/find_package.html#command:find_package" title="find_package"><code class="xref cmake cmake-command docutils literal"><span class="pre">find_package()</span></code></a> for |
| details on this.</p> |
| <p><code class="docutils literal"><span class="pre"><filename></span></code> is the output filename, it should be in the build tree. |
| <code class="docutils literal"><span class="pre"><major.minor.patch></span></code> is the version number of the project to be installed.</p> |
| <p>If no <code class="docutils literal"><span class="pre">VERSION</span></code> is given, the <span class="target" id="index-0-variable:PROJECT_VERSION"></span><a class="reference internal" href="../variable/PROJECT_VERSION.html#variable:PROJECT_VERSION" title="PROJECT_VERSION"><code class="xref cmake cmake-variable docutils literal"><span class="pre">PROJECT_VERSION</span></code></a> variable is used. |
| If this hasn’t been set, it errors out.</p> |
| <p>The <code class="docutils literal"><span class="pre">COMPATIBILITY</span></code> mode <code class="docutils literal"><span class="pre">AnyNewerVersion</span></code> means that the installed |
| package version will be considered compatible if it is newer or exactly the |
| same as the requested version. This mode should be used for packages which |
| are fully backward compatible, also across major versions. |
| If <code class="docutils literal"><span class="pre">SameMajorVersion</span></code> is used instead, then the behaviour differs from |
| <code class="docutils literal"><span class="pre">AnyNewerVersion</span></code> in that the major version number must be the same as |
| requested, e.g. version 2.0 will not be considered compatible if 1.0 is |
| requested. This mode should be used for packages which guarantee backward |
| compatibility within the same major version. |
| If <code class="docutils literal"><span class="pre">ExactVersion</span></code> is used, then the package is only considered compatible if |
| the requested version matches exactly its own version number (not considering |
| the tweak version). For example, version 1.2.3 of a package is only |
| considered compatible to requested version 1.2.3. This mode is for packages |
| without compatibility guarantees. |
| If your project has more elaborated version matching rules, you will need to |
| write your own custom <code class="docutils literal"><span class="pre">ConfigVersion.cmake</span></code> file instead of using this |
| macro.</p> |
| <p>Internally, this macro executes <span class="target" id="index-3-command:configure_file"></span><a class="reference internal" href="../command/configure_file.html#command:configure_file" title="configure_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">configure_file()</span></code></a> to create the |
| resulting version file. Depending on the <code class="docutils literal"><span class="pre">COMPATIBLITY</span></code>, either the file |
| <code class="docutils literal"><span class="pre">BasicConfigVersion-SameMajorVersion.cmake.in</span></code> or |
| <code class="docutils literal"><span class="pre">BasicConfigVersion-AnyNewerVersion.cmake.in</span></code> is used. Please note that |
| these two files are internal to CMake and you should not call |
| <span class="target" id="index-4-command:configure_file"></span><a class="reference internal" href="../command/configure_file.html#command:configure_file" title="configure_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">configure_file()</span></code></a> on them yourself, but they can be used as starting |
| point to create more sophisticted custom <code class="docutils literal"><span class="pre">ConfigVersion.cmake</span></code> files.</p> |
| </div> |
| <div class="section" id="example-generating-package-files"> |
| <h2>Example Generating Package Files<a class="headerlink" href="#example-generating-package-files" title="Permalink to this headline">¶</a></h2> |
| <p>Example using both <span class="target" id="index-1-command:configure_package_config_file"></span><a class="reference internal" href="#command:configure_package_config_file" title="configure_package_config_file"><code class="xref cmake cmake-command docutils literal"><span class="pre">configure_package_config_file()</span></code></a> and |
| <code class="docutils literal"><span class="pre">write_basic_package_version_file()</span></code>:</p> |
| <p><code class="docutils literal"><span class="pre">CMakeLists.txt</span></code>:</p> |
| <div class="highlight-cmake"><div class="highlight"><pre><span></span><span class="nb">set</span><span class="p">(</span><span class="s">INCLUDE_INSTALL_DIR</span> <span class="s">include/</span> <span class="s">...</span> <span class="s">CACHE</span> <span class="p">)</span> |
| <span class="nb">set</span><span class="p">(</span><span class="s">LIB_INSTALL_DIR</span> <span class="s">lib/</span> <span class="s">...</span> <span class="s">CACHE</span> <span class="p">)</span> |
| <span class="nb">set</span><span class="p">(</span><span class="s">SYSCONFIG_INSTALL_DIR</span> <span class="s">etc/foo/</span> <span class="s">...</span> <span class="s">CACHE</span> <span class="p">)</span> |
| <span class="c">#...</span> |
| <span class="nb">include</span><span class="p">(</span><span class="s">CMakePackageConfigHelpers</span><span class="p">)</span> |
| <span class="nb">configure_package_config_file</span><span class="p">(</span><span class="s">FooConfig.cmake.in</span> |
| <span class="o">${</span><span class="nv">CMAKE_CURRENT_BINARY_DIR</span><span class="o">}</span><span class="s">/FooConfig.cmake</span> |
| <span class="s">INSTALL_DESTINATION</span> <span class="o">${</span><span class="nv">LIB_INSTALL_DIR</span><span class="o">}</span><span class="s">/Foo/cmake</span> |
| <span class="s">PATH_VARS</span> <span class="s">INCLUDE_INSTALL_DIR</span> <span class="s">SYSCONFIG_INSTALL_DIR</span><span class="p">)</span> |
| <span class="nb">write_basic_package_version_file</span><span class="p">(</span> |
| <span class="o">${</span><span class="nv">CMAKE_CURRENT_BINARY_DIR</span><span class="o">}</span><span class="s">/FooConfigVersion.cmake</span> |
| <span class="s">VERSION</span> <span class="s">1.2.3</span> |
| <span class="s">COMPATIBILITY</span> <span class="s">SameMajorVersion</span> <span class="p">)</span> |
| <span class="nb">install</span><span class="p">(</span><span class="s">FILES</span> <span class="o">${</span><span class="nv">CMAKE_CURRENT_BINARY_DIR</span><span class="o">}</span><span class="s">/FooConfig.cmake</span> |
| <span class="o">${</span><span class="nv">CMAKE_CURRENT_BINARY_DIR</span><span class="o">}</span><span class="s">/FooConfigVersion.cmake</span> |
| <span class="s">DESTINATION</span> <span class="o">${</span><span class="nv">LIB_INSTALL_DIR</span><span class="o">}</span><span class="s">/Foo/cmake</span> <span class="p">)</span> |
| </pre></div> |
| </div> |
| <p><code class="docutils literal"><span class="pre">FooConfig.cmake.in</span></code>:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="nb">set</span><span class="p">(</span><span class="n">FOO_VERSION</span> <span class="n">x</span><span class="o">.</span><span class="n">y</span><span class="o">.</span><span class="n">z</span><span class="p">)</span> |
| <span class="o">...</span> |
| <span class="nd">@PACKAGE_INIT</span><span class="o">@</span> |
| <span class="o">...</span> |
| <span class="n">set_and_check</span><span class="p">(</span><span class="n">FOO_INCLUDE_DIR</span> <span class="s2">"@PACKAGE_INCLUDE_INSTALL_DIR@"</span><span class="p">)</span> |
| <span class="n">set_and_check</span><span class="p">(</span><span class="n">FOO_SYSCONFIG_DIR</span> <span class="s2">"@PACKAGE_SYSCONFIG_INSTALL_DIR@"</span><span class="p">)</span> |
| |
| <span class="n">check_required_components</span><span class="p">(</span><span class="n">Foo</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| |
| |
| </div> |
| </div> |
| </div> |
| <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> |
| <div class="sphinxsidebarwrapper"> |
| <h3><a href="../index.html">Table Of Contents</a></h3> |
| <ul> |
| <li><a class="reference internal" href="#">CMakePackageConfigHelpers</a><ul> |
| <li><a class="reference internal" href="#generating-a-package-configuration-file">Generating a Package Configuration File</a></li> |
| <li><a class="reference internal" href="#generating-a-package-version-file">Generating a Package Version File</a></li> |
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