added SOEM find scripts

etc/cmake/FindSOEM.cmake

+# - Try to find soem
+# Once done this will define
+#
+#  SOEM_FOUND - soem found
+#  SOEM_INCLUDE_DIR - the soem include directory
+#  SOEM_LIBRARIES - soem library
+#
+
+if(NOT "$ENV{SOEM_DIR}" EQUAL "")
+    set(SOEM_DIR $ENV{SOEM_DIR} CACHE PATH "Path to SOEM" FORCE)
+endif()
+
+set(HEADER_SEARCH_PATHS
+    ${SOEM_DIR}/include/
+    ${SOEM_DIR}/include/soem/
+    ${SOEM_DIR}/../soem/         #if SOEM_DIR points to build
+    ${SOEM_DIR}/../osal/         #if SOEM_DIR points to build
+    ${SOEM_DIR}/../oshw/         #if SOEM_DIR points to build
+    ${SOEM_DIR}/../osal/linux/   #if SOEM_DIR points to build
+    ${SOEM_DIR}/../oshw/linux/   #if SOEM_DIR points to build
+    ENV CPATH
+    /usr/include/
+    /usr/include/soem/
+    /usr/include/
+    /usr/local/include/soem/
+    /opt/local/include/soem/
+)
+
+#if soem is used from build, all headers are scattered around
+#find all of them and add them to SOEM_INCLUDE_DIR
+find_path(SOEM_INCLUDE_DIR_0 NAMES ethercatmain.h PATHS ${HEADER_SEARCH_PATHS} NO_DEFAULT_PATH)
+
+find_path(SOEM_INCLUDE_DIR_1 NAMES osal.h PATHS ${HEADER_SEARCH_PATHS} NO_DEFAULT_PATH)
+find_path(SOEM_INCLUDE_DIR_2 NAMES osal_defs.h PATHS ${HEADER_SEARCH_PATHS} NO_DEFAULT_PATH)
+
+find_path(SOEM_INCLUDE_DIR_3 NAMES oshw.h PATHS ${HEADER_SEARCH_PATHS} NO_DEFAULT_PATH)
+find_path(SOEM_INCLUDE_DIR_4 NAMES nicdrv.h PATHS ${HEADER_SEARCH_PATHS} NO_DEFAULT_PATH)
+
+if(SOEM_INCLUDE_DIR_0 AND SOEM_INCLUDE_DIR_1 AND SOEM_INCLUDE_DIR_2 AND SOEM_INCLUDE_DIR_3 AND SOEM_INCLUDE_DIR_4)
+    set(SOEM_INCLUDE_DIR ${SOEM_INCLUDE_DIR_0} ${SOEM_INCLUDE_DIR_1} ${SOEM_INCLUDE_DIR_2} ${SOEM_INCLUDE_DIR_3} ${SOEM_INCLUDE_DIR_4})
+endif()
+
+FIND_LIBRARY(SOEM_LIBRARIES NAMES soem
+  PATHS
+  ${SOEM_DIR}                #if SOEM_DIR points to build
+  ${SOEM_DIR}/lib
+  ENV LD_LIBRARY_PATH
+  ENV LIBRARY_PATH
+  /usr/lib
+  /usr/local/lib
+  /opt/local/lib
+  NO_DEFAULT_PATH
+)
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set OODL_YOUBOT_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args(SOEM  DEFAULT_MSG
+                                  SOEM_LIBRARIES SOEM_INCLUDE_DIR)
+
+
+# show the SOEM_INCLUDE_DIR and SOEM_LIBRARY_DIR variables only in the advanced view
+MARK_AS_ADVANCED(SOEM_INCLUDE_DIR SOEM_LIBRARIES)