Squashed 'third_party/eigen/' changes from 61d72f6..cf794d3
Change-Id: I9b814151b01f49af6337a8605d0c42a3a1ed4c72
git-subtree-dir: third_party/eigen
git-subtree-split: cf794d3b741a6278df169e58461f8529f43bce5d
diff --git a/cmake/FindEigen3.cmake b/cmake/FindEigen3.cmake
index 9c546a0..9e96978 100644
--- a/cmake/FindEigen3.cmake
+++ b/cmake/FindEigen3.cmake
@@ -9,6 +9,12 @@
# EIGEN3_FOUND - system has eigen lib with correct version
# EIGEN3_INCLUDE_DIR - the eigen include directory
# EIGEN3_VERSION - eigen version
+#
+# This module reads hints about search locations from
+# the following enviroment variables:
+#
+# EIGEN3_ROOT
+# EIGEN3_ROOT_DIR
# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
@@ -60,13 +66,23 @@
set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
else (EIGEN3_INCLUDE_DIR)
+
+ # search first if an Eigen3Config.cmake is available in the system,
+ # if successful this would set EIGEN3_INCLUDE_DIR and the rest of
+ # the script will work as usual
+ find_package(Eigen3 ${Eigen3_FIND_VERSION} NO_MODULE QUIET)
- find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
- PATHS
- ${CMAKE_INSTALL_PREFIX}/include
- ${KDE4_INCLUDE_DIR}
- PATH_SUFFIXES eigen3 eigen
- )
+ if(NOT EIGEN3_INCLUDE_DIR)
+ find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
+ HINTS
+ ENV EIGEN3_ROOT
+ ENV EIGEN3_ROOT_DIR
+ PATHS
+ ${CMAKE_INSTALL_PREFIX}/include
+ ${KDE4_INCLUDE_DIR}
+ PATH_SUFFIXES eigen3 eigen
+ )
+ endif(NOT EIGEN3_INCLUDE_DIR)
if(EIGEN3_INCLUDE_DIR)
_eigen3_check_version()