[ADD] - extended FindOpenCL script to search for cl.hpp too.

tools/CMakeModules/FindOpenCL.cmake

+# This script searches cl.h and cl.hpp (the C++ binding header). Grab these headers form http://www.khronos.org/registry/cl.
+#
+# The following variables will be filled:
+#   * OPENCL_FOUND - if cl.h, cl.hpp and OpenCL lib was found
+#   * OPENCL_INCLUDE_DIR - the path of cl.h if found
+#   * OPENCL_CPP_INCLUDE_DIR - the path of cl.hpp if found
+#   * OPENCL_LIBRARY - the path to the OpenCL library
+#
+
 FIND_PATH( OPENCL_INCLUDE_DIR CL/cl.h /usr/include /usr/local/include )
+FIND_PATH( OPENCL_CPP_INCLUDE_DIR CL/cl.hpp /usr/include /usr/local/include )
 FIND_LIBRARY( OPENCL_LIBRARY NAMES OpenCL PATH /usr/lib /usr/local/lib /usr/local/cuda/lib64 /usr/local/cuda/lib )
 
+message( STATUS ${OPENCL_CPP_INCLUDE_DIR} )
+
 SET( OPENCL_FOUND FALSE )
-IF ( OPENCL_INCLUDE_DIR AND OPENCL_LIBRARY )
-   SET( OPENCL_FOUND TRUE )
-ENDIF ( OPENCL_INCLUDE_DIR AND OPENCL_LIBRARY )
+IF ( OPENCL_INCLUDE_DIR AND OPENCL_CPP_INCLUDE_DIR AND OPENCL_LIBRARY )
+    SET( OPENCL_FOUND TRUE )
+ENDIF ( OPENCL_INCLUDE_DIR AND OPENCL_CPP_INCLUDE_DIR AND OPENCL_LIBRARY )
 
 IF ( OPENCL_FOUND )
    IF ( NOT OPENCL_FIND_QUIETLY )
-      MESSAGE( STATUS "Found OpenCL: ${OPENCL_LIBRARY} and include in ${OPENCL_INCLUDE_DIR}" )
+       MESSAGE( STATUS "Found OpenCL: ${OPENCL_LIBRARY} and include in ${OPENCL_INCLUDE_DIR}" )
    ENDIF ( NOT OPENCL_FIND_QUIETLY )
 ELSE ( OPENCL_FOUND )
    IF (OPENCL_FIND_REQUIRED)
-      MESSAGE( FATAL_ERROR "Could not find OpenCL" )
+      MESSAGE( FATAL_ERROR "Could not find OpenCL. Install an up-to-date graphics driver and grab the OpenCL headers from http://www.khronos.org/registry/cl." )
    ENDIF ( OPENCL_FIND_REQUIRED )
 ENDIF ( OPENCL_FOUND )
+