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# - Try to find Eigen2 lib
#
# This module supports requiring a minimum version, e.g. you can do
# find_package(Eigen2 2.0.3)
# to require version 2.0.3 to newer of Eigen2.
#
# Once done this will define
#
# EIGEN2_FOUND - system has eigen lib with correct version
# EIGEN2_INCLUDE_DIR - the eigen include directory
# EIGEN2_VERSION - eigen version
# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
# Redistribution and use is allowed according to the terms of the BSD license.
if(NOT Eigen2_FIND_VERSION)
if(NOT Eigen2_FIND_VERSION_MAJOR)
set(Eigen2_FIND_VERSION_MAJOR 2)
endif(NOT Eigen2_FIND_VERSION_MAJOR)
if(NOT Eigen2_FIND_VERSION_MINOR)
set(Eigen2_FIND_VERSION_MINOR 0)
endif(NOT Eigen2_FIND_VERSION_MINOR)
if(NOT Eigen2_FIND_VERSION_PATCH)
set(Eigen2_FIND_VERSION_PATCH 0)
endif(NOT Eigen2_FIND_VERSION_PATCH)
set(Eigen2_FIND_VERSION "${Eigen2_FIND_VERSION_MAJOR}.${Eigen2_FIND_VERSION_MINOR}.${Eigen2_FIND_VERSION_PATCH}")
endif(NOT Eigen2_FIND_VERSION)
macro(_eigen2_check_version)
file(READ "${EIGEN2_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen2_version_header)
string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen2_world_version_match "${_eigen2_version_header}")
set(EIGEN2_WORLD_VERSION "${CMAKE_MATCH_1}")
string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen2_major_version_match "${_eigen2_version_header}")
set(EIGEN2_MAJOR_VERSION "${CMAKE_MATCH_1}")
string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen2_minor_version_match "${_eigen2_version_header}")
set(EIGEN2_MINOR_VERSION "${CMAKE_MATCH_1}")
set(EIGEN2_VERSION ${EIGEN2_WORLD_VERSION}.${EIGEN2_MAJOR_VERSION}.${EIGEN2_MINOR_VERSION})
if((${EIGEN2_WORLD_VERSION} NOTEQUAL 2) OR (${EIGEN2_MAJOR_VERSION} GREATER 10) OR (${EIGEN2_VERSION} VERSION_LESS ${Eigen2_FIND_VERSION}))
set(EIGEN2_VERSION_OK FALSE)
else()
set(EIGEN2_VERSION_OK TRUE)
endif()
if(NOT EIGEN2_VERSION_OK)
message(STATUS "Eigen2 version ${EIGEN2_VERSION} found in ${EIGEN2_INCLUDE_DIR}, "
"but at least version ${Eigen2_FIND_VERSION} is required")
endif(NOT EIGEN2_VERSION_OK)
endmacro(_eigen2_check_version)
if (EIGEN2_INCLUDE_DIR)
# in cache already
_eigen2_check_version()
set(EIGEN2_FOUND ${EIGEN2_VERSION_OK})
else (EIGEN2_INCLUDE_DIR)
find_path(EIGEN2_INCLUDE_DIR NAMES Eigen/Core
PATHS
${INCLUDE_INSTALL_DIR}
${KDE4_INCLUDE_DIR}
PATH_SUFFIXES eigen2
)
if(EIGEN2_INCLUDE_DIR)
_eigen2_check_version()
endif(EIGEN2_INCLUDE_DIR)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Eigen2 DEFAULT_MSG EIGEN2_INCLUDE_DIR EIGEN2_VERSION_OK)
mark_as_advanced(EIGEN2_INCLUDE_DIR)
endif(EIGEN2_INCLUDE_DIR)
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