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# Copyright (c) 2018, ETH Zurich and UNC Chapel Hill.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
# its contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# Author: Johannes L. Schoenberger (jsch at inf.ethz.ch)
# Find package module for Eigen 3 library.
#
# The following variables are set by this module:
#
# EIGEN3_FOUND: TRUE if Eigen is found.
# EIGEN3_VERSION: Eigen library version.
# EIGEN3_INCLUDE_DIRS: Include directories for Eigen.
#
# The following variables control the behavior of this module:
#
# EIGEN3_INCLUDE_DIR_HINTS: List of additional directories in which to
# search for Eigen includes.
set(EIGEN3_INCLUDE_DIR_HINTS "" CACHE PATH "Eigen include directory")
unset(EIGEN3_FOUND)
unset(EIGEN3_VERSION)
unset(EIGEN3_INCLUDE_DIRS)
if(NOT Eigen3_FIND_VERSION)
if(NOT Eigen3_FIND_VERSION_MAJOR)
set(Eigen3_FIND_VERSION_MAJOR 2)
endif()
if(NOT Eigen3_FIND_VERSION_MINOR)
set(Eigen3_FIND_VERSION_MINOR 91)
endif()
if(NOT Eigen3_FIND_VERSION_PATCH)
set(Eigen3_FIND_VERSION_PATCH 0)
endif()
set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
endif()
macro(_EIGEN3_CHECK_VERSION)
file(READ "${EIGEN3_INCLUDE_DIRS}/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}.${EIGEN3_MINOR_VERSION})
if(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
set(EIGEN3_VERSION_OK FALSE)
else()
set(EIGEN3_VERSION_OK TRUE)
endif()
if(NOT EIGEN3_VERSION_OK)
message(STATUS "Eigen version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIRS}, "
"but at least version ${Eigen3_FIND_VERSION} is required.")
endif()
endmacro()
if(EIGEN3_INCLUDE_DIRS)
_EIGEN3_CHECK_VERSION()
set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
else()
find_path(EIGEN3_INCLUDE_DIRS
NAMES
signature_of_eigen3_matrix_library
PATHS
${EIGEN3_INCLUDE_DIR_HINTS}
/usr/include
/usr/local/include
/opt/include
/opt/local/include
PATH_SUFFIXES
eigen3
eigen
)
if(EIGEN3_INCLUDE_DIRS)
_EIGEN3_CHECK_VERSION()
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Eigen3 DEFAULT_MSG EIGEN3_INCLUDE_DIRS EIGEN3_VERSION_OK)
mark_as_advanced(EIGEN3_INCLUDE_DIRS)
endif()
if(EIGEN3_FOUND)
message(STATUS "Found Eigen")
message(STATUS " Includes : ${EIGEN3_INCLUDE_DIRS}")
else()
if(Eigen3_FIND_REQUIRED)
message(FATAL_ERROR "Could not find Eigen")
endif()
endif()
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