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@ -5,7 +5,7 @@
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CMakePackageConfigHelpers
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CMakePackageConfigHelpers
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-------------------------
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-------------------------
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Helpers functions for creating config files that can be included by other
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Helper 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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projects to find and use a package.
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Generating a Package Configuration File
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Generating a Package Configuration File
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@ -26,11 +26,11 @@ Generating a Package Configuration File
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``configure_package_config_file()`` should be used instead of the plain
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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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: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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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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It helps make the resulting package relocatable by avoiding hardcoded paths
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in the installed ``Config.cmake`` file.
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in the installed ``<PackageName>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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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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destinations known to the using project:
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.. code-block:: cmake
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.. code-block:: cmake
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@ -40,27 +40,25 @@ destinations know to the using project:
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#...logic to determine installedPrefix from the own location...
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#...logic to determine installedPrefix from the own location...
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set(FOO_CONFIG_DIR "${installedPrefix}/@CONFIG_INSTALL_DIR@" )
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set(FOO_CONFIG_DIR "${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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All four options shown above are not sufficient The first three hardcode the
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absolute directory locations, and the 4th case works only if the logic to
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absolute directory locations. The fourth 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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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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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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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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Windows and macOS, where users are used to choosing the install location of a
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binary package at install time, independent from how
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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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: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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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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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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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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2. Insert a line at the top containing only the string ``@PACKAGE_INIT@``.
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3. instead of ``set(FOO_DIR "@SOME_INSTALL_DIR@")``, use
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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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``set(FOO_DIR "@PACKAGE_SOME_INSTALL_DIR@")`` (this must be after the
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``@PACKAGE_INIT@`` line)
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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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4. Instead of using the normal :command:`configure_file()` command, use
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``configure_package_config_file()``
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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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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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same way as in :command:`configure_file()`.
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@ -70,48 +68,47 @@ 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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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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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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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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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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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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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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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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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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only if the absolute location is a subdirectory of ``INSTALL_PREFIX``.
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.. versionadded:: 3.1
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.. versionadded:: 3.1
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If the ``INSTALL_PREFIX`` argument is passed, this is used as base path to
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If the ``INSTALL_PREFIX`` argument is passed, this is used as the base path to
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calculate all the relative paths. The ``<path>`` argument must be an absolute
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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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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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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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``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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generating a ``FooConfig.cmake`` file to use your package from the build tree,
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option should be used.
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this option should be used.
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By default ``configure_package_config_file`` also generates two helper macros,
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By default, ``configure_package_config_file()`` also generates two helper
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``set_and_check()`` and ``check_required_components()`` into the
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macros, ``set_and_check()`` and ``check_required_components()``, into the
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``FooConfig.cmake`` file.
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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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``set_and_check()`` should be used instead of the normal :command:`set` command
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setting directories and file locations. Additionally to setting the variable
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for setting directories and file locations. In addition to setting the
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it also checks that the referenced file or directory actually exists and fails
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variable, it also checks that the referenced file or directory actually exists
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with a ``FATAL_ERROR`` otherwise. This makes sure that the created
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and fails with a fatal error if it doesn't. This ensures that the generated
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``FooConfig.cmake`` file does not contain wrong references.
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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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Add the ``NO_SET_AND_CHECK_MACRO`` option to prevent the generation of the
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into the ``FooConfig.cmake`` file.
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``set_and_check()`` macro in the ``FooConfig.cmake`` file.
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``check_required_components(<PackageName>)`` should be called at the end of
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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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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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non-optional components have been found, and if this is not the case, it sets
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the ``Foo_FOUND`` variable to ``FALSE``, so that the package is considered to
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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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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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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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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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users are not specifying components erroneously. Add the
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``NO_CHECK_REQUIRED_COMPONENTS_MACRO`` option, this macro is not generated
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``NO_CHECK_REQUIRED_COMPONENTS_MACRO`` option to prevent the generation of the
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into the ``FooConfig.cmake`` file.
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``check_required_components()`` macro in the ``FooConfig.cmake`` file.
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For an example see below the documentation for
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See also :ref:`CMakePackageConfigHelpers Examples`.
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:command:`write_basic_package_version_file()`.
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Generating a Package Version File
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Generating a Package Version File
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -126,11 +123,11 @@ Generating a Package Version File
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[ARCH_INDEPENDENT] )
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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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Writes a file for use as a ``<PackageName>ConfigVersion.cmake`` file to
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``<filename>``. See the documentation of :command:`find_package()` for
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``<filename>``. See the documentation of :command:`find_package()` for
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details on this.
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details on such files.
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``<filename>`` is the output filename, it should be in the build tree.
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``<filename>`` is the output filename, which 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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``<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 no ``VERSION`` is given, the :variable:`PROJECT_VERSION` variable is used.
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@ -153,9 +150,9 @@ 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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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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considered compatible to requested version 1.2.3. This mode is for packages
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without compatibility guarantees.
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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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If your project has more elaborate 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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write your own custom ``<PackageName>ConfigVersion.cmake`` file instead of
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macro.
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using this macro.
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.. versionadded:: 3.11
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.. versionadded:: 3.11
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The ``SameMinorVersion`` compatibility mode.
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The ``SameMinorVersion`` compatibility mode.
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@ -170,13 +167,13 @@ macro.
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unless ``ARCH_INDEPENDENT`` is given, in which case the package is considered
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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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compatible on any architecture.
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.. note:: ``ARCH_INDEPENDENT`` is intended for header-only libraries or similar
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.. note:: ``ARCH_INDEPENDENT`` is intended for header-only libraries or
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packages with no binaries.
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similar packages with no binaries.
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.. versionadded:: 3.19
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.. versionadded:: 3.19
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The version file generated by ``AnyNewerVersion``, ``SameMajorVersion`` and
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The version file generated by ``AnyNewerVersion``, ``SameMajorVersion`` and
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``SameMinorVersion`` arguments of ``COMPATIBILITY`` handle the version range
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``SameMinorVersion`` arguments of ``COMPATIBILITY`` handle the version range,
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if any is specified (see :command:`find_package` command for the details).
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if one is specified (see :command:`find_package` command for the details).
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``ExactVersion`` mode is incompatible with version ranges and will display an
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``ExactVersion`` mode is incompatible with version ranges and will display an
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author warning if one is specified.
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author warning if one is specified.
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@ -184,8 +181,9 @@ 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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resulting version file. Depending on the ``COMPATIBILITY``, the corresponding
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``BasicConfigVersion-<COMPATIBILITY>.cmake.in`` file is used.
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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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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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:command:`configure_file()` on them yourself, but they can be used as a starting
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point to create more sophisticated custom ``ConfigVersion.cmake`` files.
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point to create more sophisticated custom ``<PackageName>ConfigVersion.cmake``
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files.
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Generating an Apple Platform Selection File
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Generating an Apple Platform Selection File
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -268,6 +266,9 @@ Generating an Apple Platform Selection File
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consider the platform to be unsupported. The behavior is determined
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consider the platform to be unsupported. The behavior is determined
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by the ``ERROR_VARIABLE`` option.
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by the ``ERROR_VARIABLE`` option.
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Generating an Apple Architecture Selection File
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. command:: generate_apple_architecture_selection_file
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.. command:: generate_apple_architecture_selection_file
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.. versionadded:: 3.29
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.. versionadded:: 3.29
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@ -328,15 +329,16 @@ Generating an Apple Platform Selection File
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information to pretend the package was not found. If this option
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information to pretend the package was not found. If this option
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is not given, the default behavior is to issue a fatal error.
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is not given, the default behavior is to issue a fatal error.
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.. _`CMakePackageConfigHelpers Examples`:
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Example Generating Package Files
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Example Generating Package Files
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Example using both :command:`configure_package_config_file` and
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Example using both the :command:`configure_package_config_file` and
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``write_basic_package_version_file()``:
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:command:`write_basic_package_version_file()` commands:
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``CMakeLists.txt``:
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.. code-block:: cmake
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.. code-block:: cmake
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:caption: ``CMakeLists.txt``
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include(GNUInstallDirs)
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include(GNUInstallDirs)
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set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR}/Foo
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set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR}/Foo
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@ -357,9 +359,9 @@ Example using both :command:`configure_package_config_file` and
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${CMAKE_CURRENT_BINARY_DIR}/FooConfigVersion.cmake
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${CMAKE_CURRENT_BINARY_DIR}/FooConfigVersion.cmake
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DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Foo )
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DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Foo )
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``FooConfig.cmake.in``:
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.. code-block:: cmake
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:caption: ``FooConfig.cmake.in``
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::
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:force:
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set(FOO_VERSION x.y.z)
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set(FOO_VERSION x.y.z)
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...
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...
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@ -597,8 +599,15 @@ function(generate_apple_architecture_selection_file _output_file)
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)
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)
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endif()
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endif()
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string(APPEND _branch_code
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string(APPEND _branch_code
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"endif()\n"
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"endif()\n\n"
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"set(_cmake_apple_archs \"\${CMAKE_OSX_ARCHITECTURES}\")\n"
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)
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)
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if(NOT "${_gasf_UNIVERSAL_ARCHITECTURES}" STREQUAL "")
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string(APPEND _branch_code "list(REMOVE_ITEM _cmake_apple_archs ${_gasf_UNIVERSAL_ARCHITECTURES})\n")
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endif()
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string(APPEND _branch_code "\n")
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set(maybe_else "")
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foreach(pair IN ZIP_LISTS _gasf_SINGLE_ARCHITECTURES _gasf_SINGLE_ARCHITECTURE_INCLUDE_FILES)
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foreach(pair IN ZIP_LISTS _gasf_SINGLE_ARCHITECTURES _gasf_SINGLE_ARCHITECTURE_INCLUDE_FILES)
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set(arch "${pair_0}")
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set(arch "${pair_0}")
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@ -607,40 +616,45 @@ function(generate_apple_architecture_selection_file _output_file)
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string(PREPEND config_file [[${PACKAGE_PREFIX_DIR}/]])
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string(PREPEND config_file [[${PACKAGE_PREFIX_DIR}/]])
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endif()
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endif()
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string(APPEND _branch_code
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string(APPEND _branch_code
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"\n"
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"${maybe_else}if(CMAKE_OSX_ARCHITECTURES STREQUAL \"${arch}\")\n"
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"if(CMAKE_OSX_ARCHITECTURES STREQUAL \"${arch}\")\n"
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" include(\"${config_file}\")\n"
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" include(\"${config_file}\")\n"
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" return()\n"
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"endif()\n"
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)
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)
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set(maybe_else else)
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endforeach()
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endforeach()
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if(_gasf_UNIVERSAL_ARCHITECTURES AND _gasf_UNIVERSAL_INCLUDE_FILE)
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if(_gasf_UNIVERSAL_ARCHITECTURES AND _gasf_UNIVERSAL_INCLUDE_FILE)
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string(JOIN " " universal_archs "${_gasf_UNIVERSAL_ARCHITECTURES}")
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set(config_file "${_gasf_UNIVERSAL_INCLUDE_FILE}")
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set(config_file "${_gasf_UNIVERSAL_INCLUDE_FILE}")
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if(NOT IS_ABSOLUTE "${config_file}")
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if(NOT IS_ABSOLUTE "${config_file}")
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string(PREPEND config_file [[${PACKAGE_PREFIX_DIR}/]])
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string(PREPEND config_file [[${PACKAGE_PREFIX_DIR}/]])
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endif()
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endif()
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string(APPEND _branch_code
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string(APPEND _branch_code
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"\n"
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"${maybe_else}if(NOT _cmake_apple_archs)\n"
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"set(_cmake_apple_archs \"\${CMAKE_OSX_ARCHITECTURES}\")\n"
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"list(REMOVE_ITEM _cmake_apple_archs ${universal_archs})\n"
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"if(NOT _cmake_apple_archs)\n"
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" include(\"${config_file}\")\n"
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" include(\"${config_file}\")\n"
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" return()\n"
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"endif()\n"
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)
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)
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set(maybe_else else)
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elseif(_gasf_UNIVERSAL_ARCHITECTURES)
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elseif(_gasf_UNIVERSAL_ARCHITECTURES)
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message(FATAL_ERROR "UNIVERSAL_INCLUDE_FILE requires UNIVERSAL_ARCHITECTURES")
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message(FATAL_ERROR "UNIVERSAL_INCLUDE_FILE requires UNIVERSAL_ARCHITECTURES")
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elseif(_gasf_UNIVERSAL_INCLUDE_FILE)
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elseif(_gasf_UNIVERSAL_INCLUDE_FILE)
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message(FATAL_ERROR "UNIVERSAL_ARCHITECTURES requires UNIVERSAL_INCLUDE_FILE")
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message(FATAL_ERROR "UNIVERSAL_ARCHITECTURES requires UNIVERSAL_INCLUDE_FILE")
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endif()
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endif()
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string(APPEND _branch_code "\n")
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if(maybe_else)
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string(APPEND _branch_code "else()\n")
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set(_indent " ")
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else()
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set(_indent "")
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endif()
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if(_gasf_ERROR_VARIABLE)
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if(_gasf_ERROR_VARIABLE)
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string(APPEND _branch_code "set(\"${_gasf_ERROR_VARIABLE}\" \"Architecture not supported\")")
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string(APPEND _branch_code
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"${_indent}set(\"${_gasf_ERROR_VARIABLE}\" \"Architecture not supported\")\n"
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)
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else()
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else()
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string(APPEND _branch_code "message(FATAL_ERROR \"Architecture not supported\")")
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string(APPEND _branch_code
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"${_indent}message(FATAL_ERROR \"Architecture not supported\")\n"
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)
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endif()
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if(maybe_else)
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string(APPEND _branch_code "endif()\n")
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endif()
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endif()
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configure_package_config_file("${CMAKE_CURRENT_FUNCTION_LIST_DIR}/Internal/AppleArchitectureSelection.cmake.in" "${_output_file}"
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configure_package_config_file("${CMAKE_CURRENT_FUNCTION_LIST_DIR}/Internal/AppleArchitectureSelection.cmake.in" "${_output_file}"
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Timo Röhling
8 months ago