FreeCAD

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# - 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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# 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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  set(Eigen3_FIND_VERSION_MAJOR 3)
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  set(Eigen3_FIND_VERSION_MINOR 0)
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  set(Eigen3_FIND_VERSION_PATCH 0)
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  set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
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endif(NOT Eigen3_FIND_VERSION)
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macro(_eigen3_check_version)
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  file(READ "${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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    message(STATUS "Eigen3 version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIR}, "
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                   "but at least version ${Eigen3_FIND_VERSION} is required")
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  else(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
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    set(EIGEN3_VERSION_OK TRUE)
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  endif(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
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endmacro(_eigen3_check_version)
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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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else (EIGEN3_INCLUDE_DIR)
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  find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
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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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  if(EIGEN3_INCLUDE_DIR)
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    _eigen3_check_version()
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  endif(EIGEN3_INCLUDE_DIR)
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  include(FindPackageHandleStandardArgs)
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  find_package_handle_standard_args(Eigen3 REQUIRED_VARS EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK VERSION_VAR EIGEN3_VERSION)
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  mark_as_advanced(EIGEN3_INCLUDE_DIR)
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endif(EIGEN3_INCLUDE_DIR)
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