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333 lines
14 KiB
CMake
333 lines
14 KiB
CMake
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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CMakePackageConfigHelpers
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-------------------------
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Helpers functions for creating config files that can be included by other
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projects to find and use a package.
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Adds the :command:`configure_package_config_file()` and
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:command:`write_basic_package_version_file()` commands.
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Generating a Package Configuration File
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. command:: configure_package_config_file
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Create a config file for a project::
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configure_package_config_file(<input> <output>
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INSTALL_DESTINATION <path>
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[PATH_VARS <var1> <var2> ... <varN>]
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[NO_SET_AND_CHECK_MACRO]
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[NO_CHECK_REQUIRED_COMPONENTS_MACRO]
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[INSTALL_PREFIX <path>]
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)
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``configure_package_config_file()`` should be used instead of the plain
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:command:`configure_file()` command when creating the ``<PackageName>Config.cmake``
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or ``<PackageName>-config.cmake`` file for installing a project or library.
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It helps making the resulting package relocatable by avoiding hardcoded paths
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in the installed ``Config.cmake`` file.
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In a ``FooConfig.cmake`` file there may be code like this to make the install
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destinations know to the using project:
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.. code-block:: cmake
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set(FOO_INCLUDE_DIR "@CMAKE_INSTALL_FULL_INCLUDEDIR@" )
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set(FOO_DATA_DIR "@CMAKE_INSTALL_PREFIX@/@RELATIVE_DATA_INSTALL_DIR@" )
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set(FOO_ICONS_DIR "@CMAKE_INSTALL_PREFIX@/share/icons" )
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#...logic to determine installedPrefix from the own location...
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set(FOO_CONFIG_DIR "${installedPrefix}/@CONFIG_INSTALL_DIR@" )
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All 4 options shown above are not sufficient, since the first 3 hardcode the
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absolute directory locations, and the 4th case works only if the logic to
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determine the ``installedPrefix`` is correct, and if ``CONFIG_INSTALL_DIR``
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contains a relative path, which in general cannot be guaranteed. This has the
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effect that the resulting ``FooConfig.cmake`` file would work poorly under
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Windows and OSX, where users are used to choose the install location of a
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binary package at install time, independent from how
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:variable:`CMAKE_INSTALL_PREFIX` was set at build/cmake time.
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Using ``configure_package_config_file`` helps. If used correctly, it makes
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the resulting ``FooConfig.cmake`` file relocatable. Usage:
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1. write a ``FooConfig.cmake.in`` file as you are used to
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2. insert a line containing only the string ``@PACKAGE_INIT@``
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3. instead of ``set(FOO_DIR "@SOME_INSTALL_DIR@")``, use
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``set(FOO_DIR "@PACKAGE_SOME_INSTALL_DIR@")`` (this must be after the
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``@PACKAGE_INIT@`` line)
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4. instead of using the normal :command:`configure_file()`, use
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``configure_package_config_file()``
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The ``<input>`` and ``<output>`` arguments are the input and output file, the
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same way as in :command:`configure_file()`.
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The ``<path>`` given to ``INSTALL_DESTINATION`` must be the destination where
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the ``FooConfig.cmake`` file will be installed to. This path can either be
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absolute, or relative to the ``INSTALL_PREFIX`` path.
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The variables ``<var1>`` to ``<varN>`` given as ``PATH_VARS`` are the
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variables which contain install destinations. For each of them the macro will
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create a helper variable ``PACKAGE_<var...>``. These helper variables must be
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used in the ``FooConfig.cmake.in`` file for setting the installed location.
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They are calculated by ``configure_package_config_file`` so that they are
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always relative to the installed location of the package. This works both for
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relative and also for absolute locations. For absolute locations it works
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only if the absolute location is a subdirectory of ``INSTALL_PREFIX``.
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If the ``INSTALL_PREFIX`` argument is passed, this is used as base path to
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calculate all the relative paths. The ``<path>`` argument must be an absolute
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path. If this argument is not passed, the :variable:`CMAKE_INSTALL_PREFIX`
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variable will be used instead. The default value is good when generating a
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FooConfig.cmake file to use your package from the install tree. When
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generating a FooConfig.cmake file to use your package from the build tree this
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option should be used.
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By default ``configure_package_config_file`` also generates two helper macros,
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``set_and_check()`` and ``check_required_components()`` into the
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``FooConfig.cmake`` file.
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``set_and_check()`` should be used instead of the normal ``set()`` command for
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setting directories and file locations. Additionally to setting the variable
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it also checks that the referenced file or directory actually exists and fails
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with a ``FATAL_ERROR`` otherwise. This makes sure that the created
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``FooConfig.cmake`` file does not contain wrong references.
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When using the ``NO_SET_AND_CHECK_MACRO``, this macro is not generated
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into the ``FooConfig.cmake`` file.
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``check_required_components(<PackageName>)`` should be called at the end of
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the ``FooConfig.cmake`` file. This macro checks whether all requested,
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non-optional components have been found, and if this is not the case, sets
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the ``Foo_FOUND`` variable to ``FALSE``, so that the package is considered to
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be not found. It does that by testing the ``Foo_<Component>_FOUND``
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variables for all requested required components. This macro should be
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called even if the package doesn't provide any components to make sure
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users are not specifying components erroneously. When using the
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``NO_CHECK_REQUIRED_COMPONENTS_MACRO`` option, this macro is not generated
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into the ``FooConfig.cmake`` file.
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For an example see below the documentation for
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:command:`write_basic_package_version_file()`.
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Generating a Package Version File
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. command:: write_basic_package_version_file
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Create a version file for a project::
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write_basic_package_version_file(<filename>
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[VERSION <major.minor.patch>]
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COMPATIBILITY <AnyNewerVersion|SameMajorVersion|SameMinorVersion|ExactVersion>
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[ARCH_INDEPENDENT] )
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Writes a file for use as ``<PackageName>ConfigVersion.cmake`` file to
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``<filename>``. See the documentation of :command:`find_package()` for
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details on this.
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``<filename>`` is the output filename, it should be in the build tree.
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``<major.minor.patch>`` is the version number of the project to be installed.
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If no ``VERSION`` is given, the :variable:`PROJECT_VERSION` variable is used.
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If this hasn't been set, it errors out.
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The ``COMPATIBILITY`` mode ``AnyNewerVersion`` means that the installed
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package version will be considered compatible if it is newer or exactly the
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same as the requested version. This mode should be used for packages which
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are fully backward compatible, also across major versions.
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If ``SameMajorVersion`` is used instead, then the behaviour differs from
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``AnyNewerVersion`` in that the major version number must be the same as
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requested, e.g. version 2.0 will not be considered compatible if 1.0 is
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requested. This mode should be used for packages which guarantee backward
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compatibility within the same major version.
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If ``SameMinorVersion`` is used, the behaviour is the same as
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``SameMajorVersion``, but both major and minor version must be the same as
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requested, e.g version 0.2 will not be compatible if 0.1 is requested.
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If ``ExactVersion`` is used, then the package is only considered compatible if
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the requested version matches exactly its own version number (not considering
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the tweak version). For example, version 1.2.3 of a package is only
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considered compatible to requested version 1.2.3. This mode is for packages
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without compatibility guarantees.
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If your project has more elaborated version matching rules, you will need to
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write your own custom ``ConfigVersion.cmake`` file instead of using this
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macro.
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If ``ARCH_INDEPENDENT`` is given, the installed package version will be
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considered compatible even if it was built for a different architecture than
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the requested architecture. Otherwise, an architecture check will be performed,
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and the package will be considered compatible only if the architecture matches
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exactly. For example, if the package is built for a 32-bit architecture, the
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package is only considered compatible if it is used on a 32-bit architecture,
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unless ``ARCH_INDEPENDENT`` is given, in which case the package is considered
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compatible on any architecture.
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.. note:: ``ARCH_INDEPENDENT`` is intended for header-only libraries or similar
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packages with no binaries.
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Internally, this macro executes :command:`configure_file()` to create the
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resulting version file. Depending on the ``COMPATIBILITY``, the corresponding
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``BasicConfigVersion-<COMPATIBILITY>.cmake.in`` file is used.
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Please note that these files are internal to CMake and you should not call
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:command:`configure_file()` on them yourself, but they can be used as starting
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point to create more sophisticted custom ``ConfigVersion.cmake`` files.
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Example Generating Package Files
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Example using both :command:`configure_package_config_file` and
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``write_basic_package_version_file()``:
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``CMakeLists.txt``:
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.. code-block:: cmake
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set(INCLUDE_INSTALL_DIR include/ ... CACHE )
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set(LIB_INSTALL_DIR lib/ ... CACHE )
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set(SYSCONFIG_INSTALL_DIR etc/foo/ ... CACHE )
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#...
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include(CMakePackageConfigHelpers)
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configure_package_config_file(FooConfig.cmake.in
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${CMAKE_CURRENT_BINARY_DIR}/FooConfig.cmake
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INSTALL_DESTINATION ${LIB_INSTALL_DIR}/Foo/cmake
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PATH_VARS INCLUDE_INSTALL_DIR SYSCONFIG_INSTALL_DIR)
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write_basic_package_version_file(
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${CMAKE_CURRENT_BINARY_DIR}/FooConfigVersion.cmake
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VERSION 1.2.3
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COMPATIBILITY SameMajorVersion )
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install(FILES ${CMAKE_CURRENT_BINARY_DIR}/FooConfig.cmake
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${CMAKE_CURRENT_BINARY_DIR}/FooConfigVersion.cmake
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DESTINATION ${LIB_INSTALL_DIR}/Foo/cmake )
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``FooConfig.cmake.in``:
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::
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set(FOO_VERSION x.y.z)
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...
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@PACKAGE_INIT@
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...
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set_and_check(FOO_INCLUDE_DIR "@PACKAGE_INCLUDE_INSTALL_DIR@")
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set_and_check(FOO_SYSCONFIG_DIR "@PACKAGE_SYSCONFIG_INSTALL_DIR@")
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check_required_components(Foo)
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#]=======================================================================]
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include(WriteBasicConfigVersionFile)
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macro(WRITE_BASIC_PACKAGE_VERSION_FILE)
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write_basic_config_version_file(${ARGN})
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endmacro()
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function(CONFIGURE_PACKAGE_CONFIG_FILE _inputFile _outputFile)
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set(options NO_SET_AND_CHECK_MACRO NO_CHECK_REQUIRED_COMPONENTS_MACRO)
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set(oneValueArgs INSTALL_DESTINATION INSTALL_PREFIX)
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set(multiValueArgs PATH_VARS )
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cmake_parse_arguments(CCF "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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if(CCF_UNPARSED_ARGUMENTS)
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message(FATAL_ERROR "Unknown keywords given to CONFIGURE_PACKAGE_CONFIG_FILE(): \"${CCF_UNPARSED_ARGUMENTS}\"")
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endif()
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if(NOT CCF_INSTALL_DESTINATION)
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message(FATAL_ERROR "No INSTALL_DESTINATION given to CONFIGURE_PACKAGE_CONFIG_FILE()")
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endif()
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if(DEFINED CCF_INSTALL_PREFIX)
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if(IS_ABSOLUTE "${CCF_INSTALL_PREFIX}")
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set(installPrefix "${CCF_INSTALL_PREFIX}")
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else()
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message(FATAL_ERROR "INSTALL_PREFIX must be an absolute path")
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endif()
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elseif(IS_ABSOLUTE "${CMAKE_INSTALL_PREFIX}")
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set(installPrefix "${CMAKE_INSTALL_PREFIX}")
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else()
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get_filename_component(installPrefix "${CMAKE_INSTALL_PREFIX}" ABSOLUTE)
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endif()
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if(IS_ABSOLUTE "${CCF_INSTALL_DESTINATION}")
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set(absInstallDir "${CCF_INSTALL_DESTINATION}")
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else()
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set(absInstallDir "${installPrefix}/${CCF_INSTALL_DESTINATION}")
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endif()
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file(RELATIVE_PATH PACKAGE_RELATIVE_PATH "${absInstallDir}" "${installPrefix}" )
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foreach(var ${CCF_PATH_VARS})
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if(NOT DEFINED ${var})
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message(FATAL_ERROR "Variable ${var} does not exist")
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else()
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if(IS_ABSOLUTE "${${var}}")
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string(REPLACE "${installPrefix}" "\${PACKAGE_PREFIX_DIR}"
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PACKAGE_${var} "${${var}}")
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else()
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set(PACKAGE_${var} "\${PACKAGE_PREFIX_DIR}/${${var}}")
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endif()
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endif()
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endforeach()
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get_filename_component(inputFileName "${_inputFile}" NAME)
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set(PACKAGE_INIT "
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####### Expanded from @PACKAGE_INIT@ by configure_package_config_file() #######
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####### Any changes to this file will be overwritten by the next CMake run ####
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####### The input file was ${inputFileName} ########
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get_filename_component(PACKAGE_PREFIX_DIR \"\${CMAKE_CURRENT_LIST_DIR}/${PACKAGE_RELATIVE_PATH}\" ABSOLUTE)
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")
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if("${absInstallDir}" MATCHES "^(/usr)?/lib(64)?/.+")
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# Handle "/usr move" symlinks created by some Linux distros.
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string(APPEND PACKAGE_INIT "
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# Use original install prefix when loaded through a \"/usr move\"
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# cross-prefix symbolic link such as /lib -> /usr/lib.
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get_filename_component(_realCurr \"\${CMAKE_CURRENT_LIST_DIR}\" REALPATH)
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get_filename_component(_realOrig \"${absInstallDir}\" REALPATH)
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if(_realCurr STREQUAL _realOrig)
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set(PACKAGE_PREFIX_DIR \"${installPrefix}\")
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endif()
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unset(_realOrig)
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unset(_realCurr)
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")
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endif()
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if(NOT CCF_NO_SET_AND_CHECK_MACRO)
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string(APPEND PACKAGE_INIT "
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macro(set_and_check _var _file)
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set(\${_var} \"\${_file}\")
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if(NOT EXISTS \"\${_file}\")
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message(FATAL_ERROR \"File or directory \${_file} referenced by variable \${_var} does not exist !\")
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endif()
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endmacro()
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")
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endif()
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if(NOT CCF_NO_CHECK_REQUIRED_COMPONENTS_MACRO)
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string(APPEND PACKAGE_INIT "
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macro(check_required_components _NAME)
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foreach(comp \${\${_NAME}_FIND_COMPONENTS})
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if(NOT \${_NAME}_\${comp}_FOUND)
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if(\${_NAME}_FIND_REQUIRED_\${comp})
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set(\${_NAME}_FOUND FALSE)
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endif()
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endif()
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endforeach()
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endmacro()
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")
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endif()
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string(APPEND PACKAGE_INIT "
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####################################################################################")
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configure_file("${_inputFile}" "${_outputFile}" @ONLY)
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endfunction()
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