1 files changed, 86 insertions, 0 deletions
diff --git a/src/cmake/modules/FindEigen3.cmake b/src/cmake/modules/FindEigen3.cmake
new file mode 100644
index 00000000..70c07dfb
--- /dev/null
+++ b/src/cmake/modules/FindEigen3.cmake
@@ -0,0 +1,86 @@
+# - 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>
+# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
+
+include(FindPackageHandleStandardArgs)
+
+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}.${Eigen3_FIND_VERSION_PATCH}")
+endif(NOT Eigen3_FIND_VERSION)
+
+macro(_eigen3_get_version)
+  file(READ "${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})
+endmacro(_eigen3_get_version)
+
+set(EIGEN3_USE_FILE "UseEigen3")
+
+if (EIGEN3_INCLUDE_DIR)
+
+  if (EXISTS ${EIGEN3_INCLUDE_DIR}/signature_of_eigen3_matrix_library)
+    # in cache already and valid
+    _eigen3_get_version()
+    set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
+
+    find_package_handle_standard_args(Eigen3 
+      REQUIRED_VARS EIGEN3_INCLUDE_DIR
+      VERSION_VAR EIGEN3_VERSION)
+
+  else()
+    message(STATUS "Eigen3 path specified in cmake variable EIGEN3_INCLUDE_DIR is "
+                    "set to ${EIGEN3_INCLUDE_DIR}, but that path does not contains the file "
+                    "signature_of_eigen3_matrix_library and is considered as invalid.")
+  endif()
+
+
+
+else (EIGEN3_INCLUDE_DIR)
+
+  find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
+      HINTS ENV EIGEN3_INC_DIR
+            ENV EIGEN3_DIR
+      PATHS ${KDE4_INCLUDE_DIR}
+      PATH_SUFFIXES include eigen3 eigen
+      DOC "Directory containing the Eigen3 header files"
+    )
+
+  if(EIGEN3_INCLUDE_DIR)
+    _eigen3_get_version()
+  endif(EIGEN3_INCLUDE_DIR)
+
+  find_package_handle_standard_args(Eigen3 
+    REQUIRED_VARS EIGEN3_INCLUDE_DIR
+    VERSION_VAR EIGEN3_VERSION)
+
+endif(EIGEN3_INCLUDE_DIR)