Added Find eigen module

Author: cassinaj

cmake/FindEigen.cmake

@@ -0,0 +1,81 @@
+###############################################################################
+# 
+# CMake script for finding the Eigen library.
+# 
+# http://eigen.tuxfamily.org/index.php?title=Main_Page
+# 
+# Copyright (c) 2006, 2007 Montel Laurent, <[email protected]>
+# Copyright (c) 2008, 2009 Gael Guennebaud, <[email protected]>
+# Copyright (c) 2009 Benoit Jacob <[email protected]>
+# Redistribution and use is allowed according to the terms of the 2-clause BSD
+# license.
+# 
+# 
+# Input variables:
+# 
+# - Eigen_ROOT_DIR (optional): When specified, header files and libraries
+#   will be searched for in `${Eigen_ROOT_DIR}/include` and
+#   `${Eigen_ROOT_DIR}/libs` respectively, and the default CMake search order
+#   will be ignored. When unspecified, the default CMake search order is used.
+#   This variable can be specified either as a CMake or environment variable.
+#   If both are set, preference is given to the CMake variable.
+#   Use this variable for finding packages installed in a nonstandard location,
+#   or for enforcing that one of multiple package installations is picked up.
+# 
+# Cache variables (not intended to be used in CMakeLists.txt files)
+# 
+# - Eigen_INCLUDE_DIR: Absolute path to package headers.
+# 
+# 
+# Output variables:
+# 
+# - Eigen_FOUND: Boolean that indicates if the package was found
+# - Eigen_INCLUDE_DIRS: Paths to the necessary header files
+# - Eigen_VERSION: Version of Eigen library found
+# - Eigen_DEFINITIONS: Definitions to be passed on behalf of eigen
+# 
+# 
+# Example usage:
+# 
+#   # Passing the version means Eigen_FOUND will only be TRUE if a
+#   # version >= the provided version is found.
+#   find_package(Eigen 3.1.2)
+#   if(NOT Eigen_FOUND)
+#     # Error handling
+#   endif()
+#   ...
+#   add_definitions(${Eigen_DEFINITIONS})
+#   ...
+#   include_directories(${Eigen_INCLUDE_DIRS} ...)
+# 
+###############################################################################
+
+find_package(PkgConfig)
+pkg_check_modules(PC_EIGEN eigen3)
+set(EIGEN_DEFINITIONS ${PC_EIGEN_CFLAGS_OTHER})
+
+
+find_path(EIGEN_INCLUDE_DIR Eigen/Core
+    HINTS ${PC_EIGEN_INCLUDEDIR} ${PC_EIGEN_INCLUDE_DIRS}
+          "${Eigen_ROOT_DIR}" "$ENV{EIGEN_ROOT_DIR}"
+          "${EIGEN_ROOT}" "$ENV{EIGEN_ROOT}"  # Backwards Compatibility
+    PATHS "$ENV{PROGRAMFILES}/Eigen" "$ENV{PROGRAMW6432}/Eigen"
+          "$ENV{PROGRAMFILES}/Eigen 3.0.0" "$ENV{PROGRAMW6432}/Eigen 3.0.0"
+    PATH_SUFFIXES eigen3 include/eigen3 include)
+
+set(EIGEN_INCLUDE_DIRS ${EIGEN_INCLUDE_DIR})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Eigen DEFAULT_MSG EIGEN_INCLUDE_DIR)
+
+mark_as_advanced(EIGEN_INCLUDE_DIR)
+
+if(EIGEN_FOUND)
+  message(STATUS "Eigen found (include: ${EIGEN_INCLUDE_DIRS})")
+endif(EIGEN_FOUND)
+
+
+set(Eigen_INCLUDE_DIRS ${EIGEN_INCLUDE_DIRS})
+set(Eigen_FOUND ${EIGEN_FOUND})
+set(Eigen_VERSION ${EIGEN_VERSION})
+set(Eigen_DEFINITIONS ${EIGEN_DEFINITIONS})