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      1 # - Try to find Eigen3 lib
      2 #
      3 # This module supports requiring a minimum version, e.g. you can do
      4 #   find_package(Eigen3 3.1.2)
      5 # to require version 3.1.2 or newer of Eigen3.
      6 #
      7 # Once done this will define
      8 #
      9 #  EIGEN3_FOUND - system has eigen lib with correct version
     10 #  EIGEN3_INCLUDE_DIR - the eigen include directory
     11 #  EIGEN3_VERSION - eigen version
     12 
     13 # Copyright (c) 2006, 2007 Montel Laurent, <montel (a] kde.org>
     14 # Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael (a] free.fr>
     15 # Copyright (c) 2009 Benoit Jacob <jacob.benoit.1 (a] gmail.com>
     16 # Redistribution and use is allowed according to the terms of the 2-clause BSD license.
     17 
     18 if(NOT Eigen3_FIND_VERSION)
     19   if(NOT Eigen3_FIND_VERSION_MAJOR)
     20     set(Eigen3_FIND_VERSION_MAJOR 2)
     21   endif(NOT Eigen3_FIND_VERSION_MAJOR)
     22   if(NOT Eigen3_FIND_VERSION_MINOR)
     23     set(Eigen3_FIND_VERSION_MINOR 91)
     24   endif(NOT Eigen3_FIND_VERSION_MINOR)
     25   if(NOT Eigen3_FIND_VERSION_PATCH)
     26     set(Eigen3_FIND_VERSION_PATCH 0)
     27   endif(NOT Eigen3_FIND_VERSION_PATCH)
     28 
     29   set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
     30 endif(NOT Eigen3_FIND_VERSION)
     31 
     32 macro(_eigen3_check_version)
     33   file(READ "${EIGEN3_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen3_version_header)
     34 
     35   string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen3_world_version_match "${_eigen3_version_header}")
     36   set(EIGEN3_WORLD_VERSION "${CMAKE_MATCH_1}")
     37   string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")
     38   set(EIGEN3_MAJOR_VERSION "${CMAKE_MATCH_1}")
     39   string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")
     40   set(EIGEN3_MINOR_VERSION "${CMAKE_MATCH_1}")
     41 
     42   set(EIGEN3_VERSION ${EIGEN3_WORLD_VERSION}.${EIGEN3_MAJOR_VERSION}.${EIGEN3_MINOR_VERSION})
     43   if(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
     44     set(EIGEN3_VERSION_OK FALSE)
     45   else(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
     46     set(EIGEN3_VERSION_OK TRUE)
     47   endif(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
     48 
     49   if(NOT EIGEN3_VERSION_OK)
     50 
     51     message(STATUS "Eigen3 version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIR}, "
     52                    "but at least version ${Eigen3_FIND_VERSION} is required")
     53   endif(NOT EIGEN3_VERSION_OK)
     54 endmacro(_eigen3_check_version)
     55 
     56 if (EIGEN3_INCLUDE_DIR)
     57 
     58   # in cache already
     59   _eigen3_check_version()
     60   set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
     61 
     62 else (EIGEN3_INCLUDE_DIR)
     63 
     64   find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
     65       PATHS
     66       ${CMAKE_INSTALL_PREFIX}/include
     67       ${KDE4_INCLUDE_DIR}
     68       PATH_SUFFIXES eigen3 eigen
     69     )
     70 
     71   if(EIGEN3_INCLUDE_DIR)
     72     _eigen3_check_version()
     73   endif(EIGEN3_INCLUDE_DIR)
     74 
     75   include(FindPackageHandleStandardArgs)
     76   find_package_handle_standard_args(Eigen3 DEFAULT_MSG EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)
     77 
     78   mark_as_advanced(EIGEN3_INCLUDE_DIR)
     79 
     80 endif(EIGEN3_INCLUDE_DIR)
     81 
     82