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To make it easier to share find_package2 across projects let's move it into its own file.
103 lines
4.3 KiB
CMake
103 lines
4.3 KiB
CMake
################################################################################
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# Copyright (C) 2018-2021 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH #
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# #
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# This software is distributed under the terms of the #
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# GNU Lesser General Public Licence (LGPL) version 3, #
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# copied verbatim in the file "LICENSE" #
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################################################################################
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#
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# find_package2(PRIVATE|PUBLIC|INTERFACE <pkgname>
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# [VERSION <version>]
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# [COMPONENTS <list of components>]
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# [ADD_REQUIREMENTS_OF <list of dep_pgkname>]
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# [any other option the native find_package supports]...)
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#
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# Wrapper around CMake's native find_package command to add some features and bookkeeping.
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#
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# The qualifier (PRIVATE|PUBLIC|INTERFACE) to the package to populate
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# the variables PROJECT_[INTERFACE]_<pkgname>_([VERSION]|[COMPONENTS]|PACKAGE_DEPENDENCIES)
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# accordingly. This bookkeeping information is used to print our dependency found summary
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# table and to generate a part of our CMake package.
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#
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# When a dependending package is listed with ADD_REQUIREMENTS_OF the variables
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# <dep_pkgname>_<pkgname>_VERSION|COMPONENTS are looked up to and added to the native
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# VERSION (selected highest version) and COMPONENTS (deduplicated) args.
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#
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# COMPONENTS and VERSION args are then just passed to the native find_package.
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#
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macro(find_package2 qualifier pkgname)
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cmake_parse_arguments(ARGS "" "VERSION" "COMPONENTS;ADD_REQUIREMENTS_OF" ${ARGN})
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string(TOUPPER ${pkgname} pkgname_upper)
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set(__old_cpp__ ${CMAKE_PREFIX_PATH})
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set(CMAKE_PREFIX_PATH ${${pkgname_upper}_ROOT} $ENV{${pkgname_upper}_ROOT} ${CMAKE_PREFIX_PATH})
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# build lists of required versions and components
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unset(__required_versions__)
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unset(__components__)
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if(ARGS_VERSION)
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list(APPEND __required_versions__ ${ARGS_VERSION})
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endif()
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if(ARGS_COMPONENTS)
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list(APPEND __components__ ${ARGS_COMPONENTS})
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endif()
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if(ARGS_ADD_REQUIREMENTS_OF)
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foreach(dep_pkgname IN LISTS ARGS_ADD_REQUIREMENTS_OF)
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if(${dep_pkgname}_${pkgname}_VERSION)
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list(APPEND __required_versions__ ${${dep_pkgname}_${pkgname}_VERSION})
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endif()
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if(${dep_pkgname}_${pkgname}_COMPONENTS)
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list(APPEND __components__ ${${dep_pkgname}_${pkgname}_COMPONENTS})
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endif()
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endforeach()
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endif()
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# select highest required version
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unset(__version__)
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if(__required_versions__)
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list(GET __required_versions__ 0 __version__)
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foreach(v IN LISTS __required_versions__)
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if(${v} VERSION_GREATER ${__version__})
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set(__version__ ${v})
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endif()
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endforeach()
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endif()
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# deduplicate required component list
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if(__components__)
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list(REMOVE_DUPLICATES ARGS_COMPONENTS)
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endif()
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# call native find_package
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if(__components__)
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find_package(${pkgname} ${__version__} QUIET COMPONENTS ${__components__} ${ARGS_UNPARSED_ARGUMENTS})
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else()
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find_package(${pkgname} ${__version__} QUIET ${ARGS_UNPARSED_ARGUMENTS})
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endif()
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if(${pkgname}_FOUND)
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if(${qualifier} STREQUAL PRIVATE)
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set(PROJECT_${pkgname}_VERSION ${__version__})
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set(PROJECT_${pkgname}_COMPONENTS ${ARGS_COMPONENTS})
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set(PROJECT_PACKAGE_DEPENDENCIES ${PROJECT_PACKAGE_DEPENDENCIES} ${pkgname})
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elseif(${qualifier} STREQUAL PUBLIC)
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set(PROJECT_${pkgname}_VERSION ${__version__})
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set(PROJECT_${pkgname}_COMPONENTS ${ARGS_COMPONENTS})
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set(PROJECT_PACKAGE_DEPENDENCIES ${PROJECT_PACKAGE_DEPENDENCIES} ${pkgname})
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set(PROJECT_INTERFACE_${pkgname}_VERSION ${__version__})
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set(PROJECT_INTERFACE_${pkgname}_COMPONENTS ${ARGS_COMPONENTS})
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set(PROJECT_INTERFACE_PACKAGE_DEPENDENCIES ${PROJECT_INTERFACE_PACKAGE_DEPENDENCIES} ${pkgname})
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elseif(${qualifier} STREQUAL INTERFACE)
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set(PROJECT_INTERFACE_${pkgname}_VERSION ${__version__})
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set(PROJECT_INTERFACE_${pkgname}_COMPONENTS ${ARGS_COMPONENTS})
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set(PROJECT_INTERFACE_PACKAGE_DEPENDENCIES ${PROJECT_INTERFACE_PACKAGE_DEPENDENCIES} ${pkgname})
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endif()
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endif()
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unset(__version__)
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unset(__components__)
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unset(__required_versions__)
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set(CMAKE_PREFIX_PATH ${__old_cpp__})
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unset(__old_cpp__)
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endmacro()
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