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6fb3e5f176
Ancient versions of CMake required else(), endif(), and similar block termination commands to have arguments matching the command starting the block. This is no longer the preferred style.
108 lines
3.4 KiB
CMake
108 lines
3.4 KiB
CMake
# - Try to find Eigen3 lib
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#
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# This module supports requiring a minimum version, e.g. you can do
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# find_package(Eigen3 3.1.2)
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# to require version 3.1.2 or newer of Eigen3.
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#
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# Once done this will define
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#
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# EIGEN3_FOUND - system has eigen lib with correct version
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# EIGEN3_INCLUDE_DIR - the eigen include directory
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# EIGEN3_VERSION - eigen version
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#
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# and the following imported target:
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#
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# Eigen3::Eigen - The header-only Eigen library
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#
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# This module reads hints about search locations from
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# the following environment variables:
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#
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# EIGEN3_ROOT
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# EIGEN3_ROOT_DIR
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# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
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# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
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# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
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# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
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if(NOT Eigen3_FIND_VERSION)
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if(NOT Eigen3_FIND_VERSION_MAJOR)
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set(Eigen3_FIND_VERSION_MAJOR 2)
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endif()
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if(NOT Eigen3_FIND_VERSION_MINOR)
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set(Eigen3_FIND_VERSION_MINOR 91)
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endif()
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if(NOT Eigen3_FIND_VERSION_PATCH)
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set(Eigen3_FIND_VERSION_PATCH 0)
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endif()
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set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
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endif()
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macro(_eigen3_check_version)
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file(READ "${EIGEN3_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen3_version_header)
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string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen3_world_version_match "${_eigen3_version_header}")
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set(EIGEN3_WORLD_VERSION "${CMAKE_MATCH_1}")
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string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")
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set(EIGEN3_MAJOR_VERSION "${CMAKE_MATCH_1}")
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string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")
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set(EIGEN3_MINOR_VERSION "${CMAKE_MATCH_1}")
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set(EIGEN3_VERSION ${EIGEN3_WORLD_VERSION}.${EIGEN3_MAJOR_VERSION}.${EIGEN3_MINOR_VERSION})
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if(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
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set(EIGEN3_VERSION_OK FALSE)
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else()
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set(EIGEN3_VERSION_OK TRUE)
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endif()
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if(NOT EIGEN3_VERSION_OK)
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message(STATUS "Eigen3 version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIR}, "
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"but at least version ${Eigen3_FIND_VERSION} is required")
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endif()
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endmacro()
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if (EIGEN3_INCLUDE_DIR)
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# in cache already
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_eigen3_check_version()
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set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
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set(Eigen3_FOUND ${EIGEN3_VERSION_OK})
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else ()
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# search first if an Eigen3Config.cmake is available in the system,
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# if successful this would set EIGEN3_INCLUDE_DIR and the rest of
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# the script will work as usual
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find_package(Eigen3 ${Eigen3_FIND_VERSION} NO_MODULE QUIET)
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if(NOT EIGEN3_INCLUDE_DIR)
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find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
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HINTS
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ENV EIGEN3_ROOT
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ENV EIGEN3_ROOT_DIR
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PATHS
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${CMAKE_INSTALL_PREFIX}/include
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${KDE4_INCLUDE_DIR}
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PATH_SUFFIXES eigen3 eigen
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)
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endif()
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if(EIGEN3_INCLUDE_DIR)
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_eigen3_check_version()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(Eigen3 DEFAULT_MSG EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)
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mark_as_advanced(EIGEN3_INCLUDE_DIR)
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endif()
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if(EIGEN3_FOUND AND NOT TARGET Eigen3::Eigen)
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add_library(Eigen3::Eigen INTERFACE IMPORTED)
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set_target_properties(Eigen3::Eigen PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "${EIGEN3_INCLUDE_DIR}")
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endif()
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