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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
#
# EIGEN3_FOUND - system has eigen lib with correct version
# EIGEN3_INCLUDE_DIR - the eigen include directory
# EIGEN3_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.
include(FindPackageHandleStandardArgs)
if(NOT Eigen3_FIND_VERSION)
if(NOT Eigen3_FIND_VERSION_MAJOR)
set(Eigen3_FIND_VERSION_MAJOR 2)
endif(NOT Eigen3_FIND_VERSION_MAJOR)
if(NOT Eigen3_FIND_VERSION_MINOR)
set(Eigen3_FIND_VERSION_MINOR 91)
endif(NOT Eigen3_FIND_VERSION_MINOR)
if(NOT Eigen3_FIND_VERSION_PATCH)
set(Eigen3_FIND_VERSION_PATCH 0)
endif(NOT Eigen3_FIND_VERSION_PATCH)
set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
endif(NOT Eigen3_FIND_VERSION)
macro(_eigen3_get_version)
file(READ "${EIGEN3_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 "${_eigen3_version_header}")
set(EIGEN3_WORLD_VERSION "${CMAKE_MATCH_1}")
string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")
set(EIGEN3_MAJOR_VERSION "${CMAKE_MATCH_1}")
string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")
set(EIGEN3_MINOR_VERSION "${CMAKE_MATCH_1}")
set(EIGEN3_VERSION ${EIGEN3_WORLD_VERSION}.${EIGEN3_MAJOR_VERSION}.${EIGEN3_MINOR_VERSION})
endmacro(_eigen3_get_version)
set(EIGEN3_USE_FILE "UseEigen3")
if (EIGEN3_INCLUDE_DIR)
if (EXISTS ${EIGEN3_INCLUDE_DIR}/signature_of_eigen3_matrix_library)
# in cache already and valid
_eigen3_get_version()
set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
find_package_handle_standard_args(Eigen3
REQUIRED_VARS EIGEN3_INCLUDE_DIR
VERSION_VAR EIGEN3_VERSION)
else()
message(STATUS "Eigen3 path specified in cmake variable EIGEN3_INCLUDE_DIR is "
"set to ${EIGEN3_INCLUDE_DIR}, but that path does not contains the file "
"signature_of_eigen3_matrix_library and is considered as invalid.")
endif()
else (EIGEN3_INCLUDE_DIR)
find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
HINTS ENV EIGEN3_INC_DIR
ENV EIGEN3_DIR
PATHS ${KDE4_INCLUDE_DIR}
PATH_SUFFIXES include eigen3 eigen
DOC "Directory containing the Eigen3 header files"
)
if(EIGEN3_INCLUDE_DIR)
_eigen3_get_version()
endif(EIGEN3_INCLUDE_DIR)
find_package_handle_standard_args(Eigen3
REQUIRED_VARS EIGEN3_INCLUDE_DIR
VERSION_VAR EIGEN3_VERSION)
endif(EIGEN3_INCLUDE_DIR)
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