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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# This module reads hints about search locations from
14# the following enviroment variables:
15#
16# EIGEN3_ROOT
17# EIGEN3_ROOT_DIR
18
19# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
20# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
21# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
22# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
23
24if(NOT Eigen3_FIND_VERSION)
25  if(NOT Eigen3_FIND_VERSION_MAJOR)
26    set(Eigen3_FIND_VERSION_MAJOR 2)
27  endif(NOT Eigen3_FIND_VERSION_MAJOR)
28  if(NOT Eigen3_FIND_VERSION_MINOR)
29    set(Eigen3_FIND_VERSION_MINOR 91)
30  endif(NOT Eigen3_FIND_VERSION_MINOR)
31  if(NOT Eigen3_FIND_VERSION_PATCH)
32    set(Eigen3_FIND_VERSION_PATCH 0)
33  endif(NOT Eigen3_FIND_VERSION_PATCH)
34
35  set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
36endif(NOT Eigen3_FIND_VERSION)
37
38macro(_eigen3_check_version)
39  file(READ "${EIGEN3_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen3_version_header)
40
41  string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen3_world_version_match "${_eigen3_version_header}")
42  set(EIGEN3_WORLD_VERSION "${CMAKE_MATCH_1}")
43  string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")
44  set(EIGEN3_MAJOR_VERSION "${CMAKE_MATCH_1}")
45  string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")
46  set(EIGEN3_MINOR_VERSION "${CMAKE_MATCH_1}")
47
48  set(EIGEN3_VERSION ${EIGEN3_WORLD_VERSION}.${EIGEN3_MAJOR_VERSION}.${EIGEN3_MINOR_VERSION})
49  if(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
50    set(EIGEN3_VERSION_OK FALSE)
51  else(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
52    set(EIGEN3_VERSION_OK TRUE)
53  endif(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
54
55  if(NOT EIGEN3_VERSION_OK)
56
57    message(STATUS "Eigen3 version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIR}, "
58                   "but at least version ${Eigen3_FIND_VERSION} is required")
59  endif(NOT EIGEN3_VERSION_OK)
60endmacro(_eigen3_check_version)
61
62if (EIGEN3_INCLUDE_DIR)
63
64  # in cache already
65  _eigen3_check_version()
66  set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
67
68else (EIGEN3_INCLUDE_DIR)
69
70  # search first if an Eigen3Config.cmake is available in the system,
71  # if successful this would set EIGEN3_INCLUDE_DIR and the rest of
72  # the script will work as usual
73  find_package(Eigen3 ${Eigen3_FIND_VERSION} NO_MODULE QUIET)
74
75  if(NOT EIGEN3_INCLUDE_DIR)
76    find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
77        HINTS
78        ENV EIGEN3_ROOT
79        ENV EIGEN3_ROOT_DIR
80        PATHS
81        ${CMAKE_INSTALL_PREFIX}/include
82        ${KDE4_INCLUDE_DIR}
83        PATH_SUFFIXES eigen3 eigen
84      )
85  endif(NOT EIGEN3_INCLUDE_DIR)
86
87  if(EIGEN3_INCLUDE_DIR)
88    _eigen3_check_version()
89  endif(EIGEN3_INCLUDE_DIR)
90
91  include(FindPackageHandleStandardArgs)
92  find_package_handle_standard_args(Eigen3 DEFAULT_MSG EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)
93
94  mark_as_advanced(EIGEN3_INCLUDE_DIR)
95
96endif(EIGEN3_INCLUDE_DIR)
97
98