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| <div class="section" id="using-dependencies-guide"> |
| <span id="guide:Using Dependencies Guide"></span><h1><a class="toc-backref" href="#id1">Using Dependencies Guide</a><a class="headerlink" href="#using-dependencies-guide" title="Permalink to this headline">¶</a></h1> |
| <div class="contents topic" id="contents"> |
| <p class="topic-title">Contents</p> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#using-dependencies-guide" id="id1">Using Dependencies Guide</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#introduction" id="id2">Introduction</a></p></li> |
| <li><p><a class="reference internal" href="#libraries-providing-config-file-packages" id="id3">Libraries providing Config-file packages</a></p></li> |
| <li><p><a class="reference internal" href="#imported-targets-from-packages" id="id4">Imported Targets from Packages</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#libraries-not-providing-config-file-packages" id="id5">Libraries not Providing Config-file Packages</a></p></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="section" id="introduction"> |
| <h2><a class="toc-backref" href="#id2">Introduction</a><a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h2> |
| <p>For developers wishing to use CMake to consume a third |
| party binary package, there are multiple possibilities |
| regarding how to optimally do so, depending on how |
| CMake-aware the third-party library is.</p> |
| <p>CMake files provided with a software package contain |
| instructions for finding each build dependency. Some |
| build dependencies are optional in that the build may |
| succeed with a different feature set if the dependency |
| is missing, and some dependencies are required. CMake |
| searches well-known locations for each dependency, and |
| the provided software may supply additional hints or |
| locations to CMake to find each dependency.</p> |
| <p>If a required dependency is not found by |
| <span class="target" id="index-0-manual:cmake(1)"></span><a class="reference internal" href="../../manual/cmake.1.html#manual:cmake(1)" title="cmake(1)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake(1)</span></code></a>, the cache is populated with an entry |
| which contains a <code class="docutils literal notranslate"><span class="pre">NOTFOUND</span></code> value. This value can be |
| replaced by specifying it on the command line, or in |
| the <span class="target" id="index-0-manual:ccmake(1)"></span><a class="reference internal" href="../../manual/ccmake.1.html#manual:ccmake(1)" title="ccmake(1)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">ccmake(1)</span></code></a> or <span class="target" id="index-0-manual:cmake-gui(1)"></span><a class="reference internal" href="../../manual/cmake-gui.1.html#manual:cmake-gui(1)" title="cmake-gui(1)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-gui(1)</span></code></a> tool. |
| See the <span class="target" id="index-0-guide:User Interaction Guide"></span><a class="reference internal" href="../user-interaction/index.html#guide:User Interaction Guide" title="User Interaction Guide"><code class="xref cmake cmake-guide docutils literal notranslate"><span class="pre">User</span> <span class="pre">Interaction</span> <span class="pre">Guide</span></code></a> for |
| more about setting cache entries.</p> |
| </div> |
| <div class="section" id="libraries-providing-config-file-packages"> |
| <h2><a class="toc-backref" href="#id3">Libraries providing Config-file packages</a><a class="headerlink" href="#libraries-providing-config-file-packages" title="Permalink to this headline">¶</a></h2> |
| <p>The most convenient way for a third-party to provide library |
| binaries for use with CMake is to provide |
| <a class="reference internal" href="../../manual/cmake-packages.7.html#config-file-packages"><span class="std std-ref">Config-file Packages</span></a>. These packages are text files |
| shipped with the library which instruct CMake how to use the |
| library binaries and associated headers, helper tools and |
| CMake macros provided by the library.</p> |
| <p>The config files can usually be found in a directory whose |
| name matches the pattern <code class="docutils literal notranslate"><span class="pre">lib/cmake/<PackageName></span></code>, though |
| they may be in other locations instead. The |
| <code class="docutils literal notranslate"><span class="pre"><PackageName></span></code> corresponds to use in CMake code with the |
| <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 notranslate"><span class="pre">find_package()</span></code></a> command such as |
| <code class="docutils literal notranslate"><span class="pre">find_package(PackageName</span> <span class="pre">REQUIRED)</span></code>.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">lib/cmake/<PackageName></span></code> directory will contain a |
| file which is either named <code class="docutils literal notranslate"><span class="pre"><PackageName>Config.cmake</span></code> |
| or <code class="docutils literal notranslate"><span class="pre"><PackageName>-config.cmake</span></code>. This is the entry point |
| to the package for CMake. A separate optional file named |
| <code class="docutils literal notranslate"><span class="pre"><PackageName>ConfigVersion.cmake</span></code> may also exist in the |
| directory. This file is used by CMake to determine whether |
| the version of the third party package satisfies uses of the |
| <span class="target" id="index-1-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 notranslate"><span class="pre">find_package()</span></code></a> command which specify version |
| constraints. It is optional to specify a version when using |
| <span class="target" id="index-2-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 notranslate"><span class="pre">find_package()</span></code></a>, even if a <code class="docutils literal notranslate"><span class="pre">ConfigVersion</span></code> file is |
| present.</p> |
| <p>If the <code class="docutils literal notranslate"><span class="pre">Config.cmake</span></code> file is found and the |
| optionally-specified version is satisfied, then the CMake |
| <span class="target" id="index-3-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 notranslate"><span class="pre">find_package()</span></code></a> command considers the package to be |
| found and the entire library package is assumed to be |
| complete as designed.</p> |
| <p>There may be additional files providing CMake macros or |
| <a class="reference internal" href="../../manual/cmake-buildsystem.7.html#imported-targets"><span class="std std-ref">Imported Targets</span></a> for you to use. CMake does not |
| enforce any naming convention for these |
| files. They are related to the primary <code class="docutils literal notranslate"><span class="pre">Config</span></code> file by |
| use of the CMake <span class="target" id="index-0-command:include"></span><a class="reference internal" href="../../command/include.html#command:include" title="include"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">include()</span></code></a> command.</p> |
| <p><span class="target" id="index-1-guide:User Interaction Guide"></span><a class="reference internal" href="../user-interaction/index.html#guide:User Interaction Guide" title="User Interaction Guide"><code class="xref cmake cmake-guide docutils literal notranslate"><span class="pre">Invoking</span> <span class="pre">CMake</span></code></a> with the |
| intent of using a package of third party binaries requires |
| that cmake <span class="target" id="index-4-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 notranslate"><span class="pre">find_package()</span></code></a> commands succeed in finding |
| the package. If the location of the package is in a directory |
| known to CMake, the <span class="target" id="index-5-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 notranslate"><span class="pre">find_package()</span></code></a> call should |
| succeed. The directories known to cmake are platform-specific. |
| For example, packages installed on Linux with a standard |
| system package manager will be found in the <code class="docutils literal notranslate"><span class="pre">/usr</span></code> prefix |
| automatically. Packages installed in <code class="docutils literal notranslate"><span class="pre">Program</span> <span class="pre">Files</span></code> on |
| Windows will similarly be found automatically.</p> |
| <p>Packages which are not found automatically are in locations |
| not predictable to CMake such as <code class="docutils literal notranslate"><span class="pre">/opt/mylib</span></code> or |
| <code class="docutils literal notranslate"><span class="pre">$HOME/dev/prefix</span></code>. This is a normal situation and CMake |
| provides several ways for users to specify where to find |
| such libraries.</p> |
| <p>The <span class="target" id="index-0-variable:CMAKE_PREFIX_PATH"></span><a class="reference internal" href="../../variable/CMAKE_PREFIX_PATH.html#variable:CMAKE_PREFIX_PATH" title="CMAKE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_PREFIX_PATH</span></code></a> variable may be |
| <a class="reference internal" href="../user-interaction/index.html#setting-build-variables"><span class="std std-ref">set when invoking CMake</span></a>. |
| It is treated as a list of paths to search for |
| <a class="reference internal" href="../../manual/cmake-packages.7.html#config-file-packages"><span class="std std-ref">Config-file Packages</span></a>. A package installed in |
| <code class="docutils literal notranslate"><span class="pre">/opt/somepackage</span></code> will typically install config files |
| such as |
| <code class="docutils literal notranslate"><span class="pre">/opt/somepackage/lib/cmake/somePackage/SomePackageConfig.cmake</span></code>. |
| In that case, <code class="docutils literal notranslate"><span class="pre">/opt/somepackage</span></code> should be added to |
| <span class="target" id="index-1-variable:CMAKE_PREFIX_PATH"></span><a class="reference internal" href="../../variable/CMAKE_PREFIX_PATH.html#variable:CMAKE_PREFIX_PATH" title="CMAKE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_PREFIX_PATH</span></code></a>.</p> |
| <p>The environment variable <code class="docutils literal notranslate"><span class="pre">CMAKE_PREFIX_PATH</span></code> may also be |
| populated with prefixes to search for packages. Like the |
| <code class="docutils literal notranslate"><span class="pre">PATH</span></code> environment variable, this is a list and needs to use |
| the platform-specific environment variable list item separator |
| (<code class="docutils literal notranslate"><span class="pre">:</span></code> on Unix and <code class="docutils literal notranslate"><span class="pre">;</span></code> on Windows).</p> |
| <p>The <span class="target" id="index-2-variable:CMAKE_PREFIX_PATH"></span><a class="reference internal" href="../../variable/CMAKE_PREFIX_PATH.html#variable:CMAKE_PREFIX_PATH" title="CMAKE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_PREFIX_PATH</span></code></a> variable provides convenience |
| in cases where multiple prefixes need to be specified, or when |
| multiple different package binaries are available in the same |
| prefix. Paths to packages may also be specified by setting |
| variables matching <code class="docutils literal notranslate"><span class="pre"><PackageName>_DIR</span></code>, such as |
| <code class="docutils literal notranslate"><span class="pre">SomePackage_DIR</span></code>. Note that this is not a prefix but should |
| be a full path to a directory containing a config-style package |
| file, such as <code class="docutils literal notranslate"><span class="pre">/opt/somepackage/lib/cmake/SomePackage/</span></code> in |
| the above example.</p> |
| </div> |
| <div class="section" id="imported-targets-from-packages"> |
| <h2><a class="toc-backref" href="#id4">Imported Targets from Packages</a><a class="headerlink" href="#imported-targets-from-packages" title="Permalink to this headline">¶</a></h2> |
| <p>A third-party package which provides config-file packages may |
| also provide <a class="reference internal" href="../../manual/cmake-buildsystem.7.html#imported-targets"><span class="std std-ref">Imported Targets</span></a>. These will be |
| specified in files containing configuration-specific file |
| paths relevant to the package, such as debug and release |
| versions of libraries.</p> |
| <p>Often the third-party package documentation will point out the |
| names of imported targets available after a successful |
| <code class="docutils literal notranslate"><span class="pre">find_package</span></code> for a library. Those imported target names |
| can be used with the <span class="target" id="index-0-command:target_link_libraries"></span><a class="reference internal" href="../../command/target_link_libraries.html#command:target_link_libraries" title="target_link_libraries"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_link_libraries()</span></code></a> command.</p> |
| <p>A complete example which makes a simple use of a third party |
| library might look like:</p> |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">cmake_minimum_required(</span><span class="no">VERSION</span><span class="w"> </span><span class="m">3.10</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">project(</span><span class="nb">MyExeProject</span><span class="w"> </span><span class="no">VERSION</span><span class="w"> </span><span class="m">1.0.0</span><span class="nf">)</span><span class="w"></span> |
| |
| <span class="nf">find_package(</span><span class="nb">SomePackage</span><span class="w"> </span><span class="no">REQUIRED</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">add_executable(</span><span class="nb">MyExe</span><span class="w"> </span><span class="nb">main.cpp</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">target_link_libraries(</span><span class="nb">MyExe</span><span class="w"> </span><span class="no">PRIVATE</span><span class="w"> </span><span class="nb">SomePrefix</span><span class="o">::</span><span class="nb">LibName</span><span class="nf">)</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>See <span class="target" id="index-0-manual:cmake-buildsystem(7)"></span><a class="reference internal" href="../../manual/cmake-buildsystem.7.html#manual:cmake-buildsystem(7)" title="cmake-buildsystem(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-buildsystem(7)</span></code></a> for further information |
| about developing a CMake buildsystem.</p> |
| <div class="section" id="libraries-not-providing-config-file-packages"> |
| <h3><a class="toc-backref" href="#id5">Libraries not Providing Config-file Packages</a><a class="headerlink" href="#libraries-not-providing-config-file-packages" title="Permalink to this headline">¶</a></h3> |
| <p>Third-party libraries which do not provide config-file packages |
| can still be found with the <span class="target" id="index-6-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 notranslate"><span class="pre">find_package()</span></code></a> command, if |
| a <code class="docutils literal notranslate"><span class="pre">FindSomePackage.cmake</span></code> file is available.</p> |
| <p>These module-file packages are different to config-file packages |
| in that:</p> |
| <ol class="arabic simple"> |
| <li><p>They should not be provided by the third party, except |
| perhaps in the form of documentation</p></li> |
| <li><p>The availability of a <code class="docutils literal notranslate"><span class="pre">Find<PackageName>.cmake</span></code> file does |
| not indicate the availability of the binaries themselves.</p></li> |
| <li><p>CMake does not search the <span class="target" id="index-3-variable:CMAKE_PREFIX_PATH"></span><a class="reference internal" href="../../variable/CMAKE_PREFIX_PATH.html#variable:CMAKE_PREFIX_PATH" title="CMAKE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_PREFIX_PATH</span></code></a> for |
| <code class="docutils literal notranslate"><span class="pre">Find<PackageName>.cmake</span></code> files. Instead CMake searches |
| for such files in the <span class="target" id="index-0-variable:CMAKE_MODULE_PATH"></span><a class="reference internal" href="../../variable/CMAKE_MODULE_PATH.html#variable:CMAKE_MODULE_PATH" title="CMAKE_MODULE_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_MODULE_PATH</span></code></a> |
| variable. It is common for users to set the |
| <span class="target" id="index-1-variable:CMAKE_MODULE_PATH"></span><a class="reference internal" href="../../variable/CMAKE_MODULE_PATH.html#variable:CMAKE_MODULE_PATH" title="CMAKE_MODULE_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_MODULE_PATH</span></code></a> when running CMake, and it is |
| common for CMake projects to append to |
| <span class="target" id="index-2-variable:CMAKE_MODULE_PATH"></span><a class="reference internal" href="../../variable/CMAKE_MODULE_PATH.html#variable:CMAKE_MODULE_PATH" title="CMAKE_MODULE_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_MODULE_PATH</span></code></a> to allow use of local |
| module-file packages.</p></li> |
| <li><p>CMake ships <code class="docutils literal notranslate"><span class="pre">Find<PackageName>.cmake</span></code> files for some |
| <span class="target" id="index-0-manual:cmake-modules(7)"></span><a class="reference internal" href="../../manual/cmake-modules.7.html#manual:cmake-modules(7)" title="cmake-modules(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">third</span> <span class="pre">party</span> <span class="pre">packages</span></code></a> |
| for convenience in cases where the third party does |
| not provide config-file packages directly. These files are |
| a maintenance burden for CMake, so new Find modules are |
| generally not added to CMake anymore. Third-parties should |
| provide config file packages instead of relying on a Find |
| module to be provided by CMake.</p></li> |
| </ol> |
| <p>Module-file packages may also provide <a class="reference internal" href="../../manual/cmake-buildsystem.7.html#imported-targets"><span class="std std-ref">Imported Targets</span></a>. |
| A complete example which finds such a package might look |
| like:</p> |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">cmake_minimum_required(</span><span class="no">VERSION</span><span class="w"> </span><span class="m">3.10</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">project(</span><span class="nb">MyExeProject</span><span class="w"> </span><span class="no">VERSION</span><span class="w"> </span><span class="m">1.0.0</span><span class="nf">)</span><span class="w"></span> |
| |
| <span class="nf">find_package(</span><span class="no">PNG</span><span class="w"> </span><span class="no">REQUIRED</span><span class="nf">)</span><span class="w"></span> |
| |
| <span class="c"># Add path to a FindSomePackage.cmake file</span> |
| <span class="nf">list(</span><span class="no">APPEND</span><span class="w"> </span><span class="no">CMAKE_MODULE_PATH</span><span class="w"> </span><span class="s">"${CMAKE_SOURCE_DIR}/cmake"</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">find_package(</span><span class="nb">SomePackage</span><span class="w"> </span><span class="no">REQUIRED</span><span class="nf">)</span><span class="w"></span> |
| |
| <span class="nf">add_executable(</span><span class="nb">MyExe</span><span class="w"> </span><span class="nb">main.cpp</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">target_link_libraries(</span><span class="nb">MyExe</span><span class="w"> </span><span class="no">PRIVATE</span><span class="w"></span> |
| <span class="w"> </span><span class="no">PNG</span><span class="o">::</span><span class="no">PNG</span><span class="w"></span> |
| <span class="w"> </span><span class="nb">SomePrefix</span><span class="o">::</span><span class="nb">LibName</span><span class="w"></span> |
| <span class="nf">)</span><span class="w"></span> |
| </pre></div> |
| </div> |
| <p>The <span class="target" id="index-0-variable:<PackageName>_ROOT"></span><a class="reference internal" href="../../variable/PackageName_ROOT.html#variable:<PackageName>_ROOT" title="<PackageName>_ROOT"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre"><PackageName>_ROOT</span></code></a> variable is also |
| searched as a prefix for <span class="target" id="index-7-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 notranslate"><span class="pre">find_package()</span></code></a> calls using |
| module-file packages such as <code class="docutils literal notranslate"><span class="pre">FindSomePackage</span></code>.</p> |
| </div> |
| </div> |
| </div> |
| |
| |
| <div class="clearer"></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="#">Using Dependencies Guide</a><ul> |
| <li><a class="reference internal" href="#introduction">Introduction</a></li> |
| <li><a class="reference internal" href="#libraries-providing-config-file-packages">Libraries providing Config-file packages</a></li> |
| <li><a class="reference internal" href="#imported-targets-from-packages">Imported Targets from Packages</a><ul> |
| <li><a class="reference internal" href="#libraries-not-providing-config-file-packages">Libraries not Providing Config-file Packages</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| |
| <h4>Previous topic</h4> |
| <p class="topless"><a href="../user-interaction/index.html" |
| title="previous chapter">User Interaction Guide</a></p> |
| <h4>Next topic</h4> |
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