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# - Try to find Eigen3 lib
#
# This module supports requiring a minimum version, e.g. you can do
# find_package(Eigen3 3.1.2)
# to require version 3.1.2 or newer of Eigen3.
#
# Once done this will define
#
# EIGEN_FOUND - system has eigen lib with correct version
# EIGEN_INCLUDE_DIR - the eigen include directory
# EIGEN_VERSION - eigen version
# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
if(NOT Eigen_FIND_VERSION)
if(NOT Eigen_FIND_VERSION_MAJOR)
set(Eigen_FIND_VERSION_MAJOR 2)
endif(NOT Eigen_FIND_VERSION_MAJOR)
if(NOT Eigen_FIND_VERSION_MINOR)
set(Eigen_FIND_VERSION_MINOR 91)
endif(NOT Eigen_FIND_VERSION_MINOR)
if(NOT Eigen_FIND_VERSION_PATCH)
set(Eigen_FIND_VERSION_PATCH 0)
endif(NOT Eigen_FIND_VERSION_PATCH)
set(Eigen_FIND_VERSION "${Eigen_FIND_VERSION_MAJOR}.${Eigen_FIND_VERSION_MINOR}.${Eigen_FIND_VERSION_PATCH}")
endif(NOT Eigen_FIND_VERSION)
macro(_eigen3_check_version)
file(READ "${EIGEN_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen3_version_header)
string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen3_world_version_match "${_eigen3_version_header}")
set(EIGEN_WORLD_VERSION "${CMAKE_MATCH_1}")
string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")
set(EIGEN_MAJOR_VERSION "${CMAKE_MATCH_1}")
string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")
set(EIGEN_MINOR_VERSION "${CMAKE_MATCH_1}")
set(EIGEN_VERSION ${EIGEN_WORLD_VERSION}.${EIGEN_MAJOR_VERSION}.${EIGEN_MINOR_VERSION})
if(${EIGEN_VERSION} VERSION_LESS ${Eigen_FIND_VERSION})
set(EIGEN_VERSION_OK FALSE)
else(${EIGEN_VERSION} VERSION_LESS ${Eigen_FIND_VERSION})
set(EIGEN_VERSION_OK TRUE)
endif(${EIGEN_VERSION} VERSION_LESS ${Eigen_FIND_VERSION})
if(NOT EIGEN_VERSION_OK)
message(STATUS "Eigen version ${EIGEN_VERSION} found in ${EIGEN_INCLUDE_DIR}, "
"but at least version ${Eigen_FIND_VERSION} is required")
endif(NOT EIGEN_VERSION_OK)
endmacro(_eigen3_check_version)
if (EIGEN_INCLUDE_DIRS)
# in cache already
_eigen3_check_version()
set(EIGEN_FOUND ${EIGEN_VERSION_OK})
else ()
find_path(EIGEN_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
PATHS
${CMAKE_INSTALL_PREFIX}/include
${KDE4_INCLUDE_DIR}
PATH_SUFFIXES eigen3 eigen
)
if(EIGEN_INCLUDE_DIR)
_eigen3_check_version()
endif(EIGEN_INCLUDE_DIR)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Eigen DEFAULT_MSG EIGEN_INCLUDE_DIR EIGEN_VERSION_OK)
mark_as_advanced(EIGEN_INCLUDE_DIR)
SET(EIGEN_INCLUDE_DIRS ${EIGEN_INCLUDE_DIR} CACHE PATH "The Eigen include path.")
endif()
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