removing FindEigen3.cmake in favor of the system version

CMakeModules/FindEigen3.cmake

-# - Try to find Eigen3 lib
-#
-# This module supports requiring a minimum version, e.g. you can do
-#   find_package(Eigen3 3.1.2)
-# to require version 3.1.2 or newer of Eigen3.
-#
-# Once done this will define
-#
-#  Eigen3_FOUND - system has eigen lib with correct version
-#  Eigen3_INCLUDE_DIR - the eigen include directory
-#  Eigen3_VERSION - eigen version
-
-# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
-# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
-# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
-# Copyright (c) 2011 Manfred Kroehnert <Manfred.Kroehnert@kit.edu> "No all uppercase variable names"
-# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
-
-if(NOT Eigen3_FIND_VERSION)
-  if(NOT Eigen3_FIND_VERSION_MAJOR)
-    set(Eigen3_FIND_VERSION_MAJOR 2)
-  endif(NOT Eigen3_FIND_VERSION_MAJOR)
-  if(NOT Eigen3_FIND_VERSION_MINOR)
-    set(Eigen3_FIND_VERSION_MINOR 91)
-  endif(NOT Eigen3_FIND_VERSION_MINOR)
-  if(NOT Eigen3_FIND_VERSION_PATCH)
-    set(Eigen3_FIND_VERSION_PATCH 0)
-  endif(NOT Eigen3_FIND_VERSION_PATCH)
-
-  set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
-endif(NOT Eigen3_FIND_VERSION)
-
-macro(_eigen3_check_version)
-  file(READ "${Eigen3_INCLUDE_DIR}/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 ${Eigen3_FIND_VERSION})
-    set(Eigen3_VERSION_OK FALSE)
-  else(${Eigen3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
-    set(Eigen3_VERSION_OK TRUE)
-  endif(${Eigen3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
-
-  if(NOT Eigen3_VERSION_OK)
-
-    message(STATUS "Eigen3 version ${Eigen3_VERSION} found in ${Eigen3_INCLUDE_DIR}, "
-                   "but at least version ${Eigen3_FIND_VERSION} is required")
-  endif(NOT Eigen3_VERSION_OK)
-endmacro(_eigen3_check_version)
-
-if (Eigen3_INCLUDE_DIR)
-
-  # in cache already
-  _eigen3_check_version()
-  set(Eigen3_FOUND ${Eigen3_VERSION_OK})
-
-else (Eigen3_INCLUDE_DIR)
-
-  find_path(Eigen3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
-      PATHS
-      ${CMAKE_INSTALL_PREFIX}/include
-      ${KDE4_INCLUDE_DIR}
-      ${Eigen3_DIR}
-      $ENV{Eigen3_DIR}
-      /org/share/archive/SFB588_RefDist/eigen3/
-      PATH_SUFFIXES eigen3 eigen
-    )
-
-  if(Eigen3_INCLUDE_DIR)
-    _eigen3_check_version()
-    set(Eigen3_FOUND ${Eigen3_VERSION_OK})
-  endif(Eigen3_INCLUDE_DIR)
-
-  include(FindPackageHandleStandardArgs)
-  find_package_handle_standard_args(Eigen3 DEFAULT_MSG Eigen3_INCLUDE_DIR Eigen3_VERSION_OK)
-
-  mark_as_advanced(Eigen3_INCLUDE_DIR)
-
-endif(Eigen3_INCLUDE_DIR)
-