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+# - CONFIGURE_PACKAGE_CONFIG_FILE(), WRITE_BASIC_PACKAGE_VERSION_FILE()
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+#
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+# CONFIGURE_PACKAGE_CONFIG_FILE(<input> <output> 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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+#
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+# CONFIGURE_PACKAGE_CONFIG_FILE() should be used instead of the plain
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+# CONFIGURE_FILE() command when creating the <Name>Config.cmake or <Name>-config.cmake
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+# file for installing a project or library. It helps making the resulting package
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+# relocatable by avoiding hardcoded paths in the installed Config.cmake file.
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+#
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+# In a FooConfig.cmake file there may be code like this to make the
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+# install destinations know to the using project:
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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
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+# the absolute directory locations, and the 4th case works only if the logic
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+# to determine the installedPrefix is correct, and if CONFIG_INSTALL_DIR contains
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+# a relative path, which in general cannot be guaranteed.
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+# This has the effect that the resulting FooConfig.cmake file would work poorly
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+# under Windows and OSX, where users are used to choose the install location
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+# of a binary package at install time, independent from how CMAKE_INSTALL_PREFIX
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+# was set at build/cmake time.
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+#
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+# Using CONFIGURE_PACKAGE_CONFIG_FILE() helps. If used correctly, it makes the
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+# resulting FooConfig.cmake file relocatable.
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+# 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 SET(FOO_DIR "@PACKAGE_SOME_INSTALL_DIR@")
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+# (this must be after the @PACKAGE_INIT@ line)
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+# 4. instead of using the normal CONFIGURE_FILE(), use CONFIGURE_PACKAGE_CONFIG_FILE()
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+#
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+# The <input> and <output> arguments are the input and output file, the same way
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+# as in CONFIGURE_FILE().
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+#
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+# The <path> given to INSTALL_DESTINATION must be the destination where the FooConfig.cmake
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+# file will be installed to. This can either be a relative or absolute path, both work.
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+#
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+# The variables <var1> to <varN> given as PATH_VARS are the variables which contain
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+# install destinations. For each of them the macro will create a helper variable
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+# PACKAGE_<var...>. These helper variables must be used
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+# in the FooConfig.cmake.in file for setting the installed location. They are calculated
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+# by CONFIGURE_PACKAGE_CONFIG_FILE() so that they are always relative to the
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+# installed location of the package. This works both for relative and also for absolute locations.
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+# For absolute locations it works only if the absolute location is a subdirectory
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+# of CMAKE_INSTALL_PREFIX.
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+#
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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 FooConfig.cmake file.
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+#
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+# set_and_check() should be used instead of the normal set()
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+# command for setting directories and file locations. Additionally to setting the
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+# variable it also checks that the referenced file or directory actually exists
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+# and fails 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 into the
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+# FooConfig.cmake file.
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+#
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+# check_required_components(<package_name>) should be called at the end of the
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+# FooConfig.cmake file if the package supports components.
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+# This macro checks whether all requested, non-optional components have been found,
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+# and if this is not the case, sets the Foo_FOUND variable to FALSE, so that the package
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+# is considered to be not found.
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+# It does that by testing the Foo_<Component>_FOUND variables for all requested
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+# required components.
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+# When using the NO_CHECK_REQUIRED_COMPONENTS option, this macro is not generated
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+# into the FooConfig.cmake file.
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+#
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+# For an example see below the documentation for WRITE_BASIC_PACKAGE_VERSION_FILE().
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+#
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+#
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+# WRITE_BASIC_PACKAGE_VERSION_FILE( filename VERSION major.minor.patch COMPATIBILITY (AnyNewerVersion|SameMajorVersion|ExactVersion) )
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+#
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+# Writes a file for use as <package>ConfigVersion.cmake file to <filename>.
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+# See the documentation of FIND_PACKAGE() for 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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+# The COMPATIBILITY mode AnyNewerVersion means that the installed package version
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+# will be considered compatible if it is newer or exactly the same as the requested version.
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+# This mode should be used for packages which are fully backward compatible,
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+# also across major versions.
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+# If SameMajorVersion is used instead, then the behaviour differs from AnyNewerVersion
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+# in that the major version number must be the same as requested, e.g. version 2.0 will
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+# not be considered compatible if 1.0 is requested.
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+# This mode should be used for packages which guarantee backward compatibility within the
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+# same major version.
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+# If ExactVersion is used, then the package is only considered compatible if the requested
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+# version matches exactly its own version number (not considering the tweak version).
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+# For example, version 1.2.3 of a package is only considered compatible to requested version 1.2.3.
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+# This mode is for packages without compatibility guarantees.
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+# If your project has more elaborated version matching rules, you will need to write your
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+# own custom ConfigVersion.cmake file instead of using this macro.
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+#
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+# Internally, this macro executes configure_file() to create the resulting
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+# version file. Depending on the COMPATIBLITY, either the file
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+# BasicConfigVersion-SameMajorVersion.cmake.in or BasicConfigVersion-AnyNewerVersion.cmake.in
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+# is used. Please note that these two files are internal to CMake and you should
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+# not call 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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+#
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+#
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+# Example using both configure_package_config_file() and write_basic_package_version_file():
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+# CMakeLists.txt:
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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 ${CMAKE_CURRENT_BINARY_DIR}/FooConfig.cmake
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+# INSTALL_DESTINATION ${LIB_INSTALL_DIR}/Foo/cmake
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+# PATH_VARS INCLUDE_INSTALL_DIR SYSCONFIG_INSTALL_DIR)
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+# write_basic_package_version_file(${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 ${CMAKE_CURRENT_BINARY_DIR}/FooConfigVersion.cmake
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+# DESTINATION ${LIB_INSTALL_DIR}/Foo/cmake )
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+#
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+# With a FooConfig.cmake.in:
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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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+#
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+# check_required_components(Foo)
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+
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+
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+#=============================================================================
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+# Copyright 2012 Alexander Neundorf <[email protected]>
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+#
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+# Distributed under the OSI-approved BSD License (the "License");
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+# see accompanying file Copyright.txt for details.
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+#
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+# This software is distributed WITHOUT ANY WARRANTY; without even the
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+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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+# See the License for more information.
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+#=============================================================================
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+# (To distribute this file outside of CMake, substitute the full
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+# License text for the above reference.)
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+
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+include(CMakeParseArguments)
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+
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+include(WriteBasicConfigVersionFile)
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+
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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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+
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+
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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 )
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+ set(multiValueArgs PATH_VARS )
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+
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+ cmake_parse_arguments(CCF "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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+
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+ if(CCF_UNPARSED_ARGUMENTS)
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+ message(FATAL_ERROR "Unknown keywords given to CONFIGURE_PACKAGE_CONFIG_FILE(): \"${CCF_UNPARSED_ARGUMENTS}\"")
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+ endif()
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+
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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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+
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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 "${CMAKE_INSTALL_PREFIX}/${CCF_INSTALL_DESTINATION}")
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+ endif()
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+ file(RELATIVE_PATH PACKAGE_RELATIVE_PATH "${absInstallDir}" "${CMAKE_INSTALL_PREFIX}" )
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+
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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 ${var} does not exist")
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+ else()
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+ if(IS_ABSOLUTE "${${var}}")
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+ string(REPLACE "${CMAKE_INSTALL_PREFIX}" "\${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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+
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+ set(PACKAGE_INIT "
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+####### Expanded from @PACKAGE_INIT@ by configure_package_config_file() #######
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+get_filename_component(PACKAGE_PREFIX_DIR \"\${CMAKE_CURRENT_LIST_DIR}/${PACKAGE_RELATIVE_PATH}\" ABSOLUTE)
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+")
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+
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+ if(NOT CCF_NO_SET_AND_CHECK_MACRO)
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+ set(PACKAGE_INIT "${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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+
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+
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+ if(NOT CCF_NO_CHECK_REQUIRED_COMPONENTS_MACRO)
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+ set(PACKAGE_INIT "${PACKAGE_INIT}
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+macro(check_required_components _NAME)
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+ foreach(comp \${\${_NAME}_FIND_COMPONENTS})
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+ if(NOT \${_NAME}_\${comp}_FOUND)
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+ if(\${_NAME}_FIND_REQUIRED_\${comp})
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+ set(\${_NAME}_FOUND FALSE)
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+ endif()
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+ endif()
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+ endforeach(comp)
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+endmacro()
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+")
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+ endif()
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+
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+ set(PACKAGE_INIT "${PACKAGE_INIT}
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+####################################################################################")
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+
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+ configure_file("${_inputFile}" "${_outputFile}" @ONLY)
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+
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+endfunction()
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Zbigniew Mandziejewicz