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      1 # - Try to find Eigen2 lib
      2 #
      3 # This module supports requiring a minimum version, e.g. you can do
      4 #   find_package(Eigen2 2.0.3)
      5 # to require version 2.0.3 to newer of Eigen2.
      6 #
      7 # Once done this will define
      8 #
      9 #  EIGEN2_FOUND - system has eigen lib with correct version
     10 #  EIGEN2_INCLUDE_DIR - the eigen include directory
     11 #  EIGEN2_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 # Redistribution and use is allowed according to the terms of the BSD license.
     16 
     17 if(NOT Eigen2_FIND_VERSION)
     18   if(NOT Eigen2_FIND_VERSION_MAJOR)
     19     set(Eigen2_FIND_VERSION_MAJOR 2)
     20   endif(NOT Eigen2_FIND_VERSION_MAJOR)
     21   if(NOT Eigen2_FIND_VERSION_MINOR)
     22     set(Eigen2_FIND_VERSION_MINOR 0)
     23   endif(NOT Eigen2_FIND_VERSION_MINOR)
     24   if(NOT Eigen2_FIND_VERSION_PATCH)
     25     set(Eigen2_FIND_VERSION_PATCH 0)
     26   endif(NOT Eigen2_FIND_VERSION_PATCH)
     27 
     28   set(Eigen2_FIND_VERSION "${Eigen2_FIND_VERSION_MAJOR}.${Eigen2_FIND_VERSION_MINOR}.${Eigen2_FIND_VERSION_PATCH}")
     29 endif(NOT Eigen2_FIND_VERSION)
     30 
     31 macro(_eigen2_check_version)
     32   file(READ "${EIGEN2_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen2_version_header)
     33 
     34   string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen2_world_version_match "${_eigen2_version_header}")
     35   set(EIGEN2_WORLD_VERSION "${CMAKE_MATCH_1}")
     36   string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen2_major_version_match "${_eigen2_version_header}")
     37   set(EIGEN2_MAJOR_VERSION "${CMAKE_MATCH_1}")
     38   string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen2_minor_version_match "${_eigen2_version_header}")
     39   set(EIGEN2_MINOR_VERSION "${CMAKE_MATCH_1}")
     40 
     41   set(EIGEN2_VERSION ${EIGEN2_WORLD_VERSION}.${EIGEN2_MAJOR_VERSION}.${EIGEN2_MINOR_VERSION})
     42   if((${EIGEN2_WORLD_VERSION} NOTEQUAL 2) OR (${EIGEN2_MAJOR_VERSION} GREATER 10) OR (${EIGEN2_VERSION} VERSION_LESS ${Eigen2_FIND_VERSION}))
     43     set(EIGEN2_VERSION_OK FALSE)
     44   else()
     45     set(EIGEN2_VERSION_OK TRUE)
     46   endif()
     47 
     48   if(NOT EIGEN2_VERSION_OK)
     49 
     50     message(STATUS "Eigen2 version ${EIGEN2_VERSION} found in ${EIGEN2_INCLUDE_DIR}, "
     51                    "but at least version ${Eigen2_FIND_VERSION} is required")
     52   endif(NOT EIGEN2_VERSION_OK)
     53 endmacro(_eigen2_check_version)
     54 
     55 if (EIGEN2_INCLUDE_DIR)
     56 
     57   # in cache already
     58   _eigen2_check_version()
     59   set(EIGEN2_FOUND ${EIGEN2_VERSION_OK})
     60 
     61 else (EIGEN2_INCLUDE_DIR)
     62 
     63 find_path(EIGEN2_INCLUDE_DIR NAMES Eigen/Core
     64      PATHS
     65      ${INCLUDE_INSTALL_DIR}
     66      ${KDE4_INCLUDE_DIR}
     67      PATH_SUFFIXES eigen2
     68    )
     69 
     70 if(EIGEN2_INCLUDE_DIR)
     71   _eigen2_check_version()
     72 endif(EIGEN2_INCLUDE_DIR)
     73 
     74 include(FindPackageHandleStandardArgs)
     75 find_package_handle_standard_args(Eigen2 DEFAULT_MSG EIGEN2_INCLUDE_DIR EIGEN2_VERSION_OK)
     76 
     77 mark_as_advanced(EIGEN2_INCLUDE_DIR)
     78 
     79 endif(EIGEN2_INCLUDE_DIR)
     80 
     81