message: COMP: add multiple definition flag iff on BG/Q
  Add the "--allow-multiple-definition" linker flag, only
  if we are on BG/Q, idicated according to the value of
  the SYS_TYPE environment flag. This is not a valid linkere
  flag when using the clang compiler on a mac.
diff: @@ -54,11 +54,15 @@ if (ENABLE_MPI AND ENABLE_SIDRE)
  set(quest_data_dir ${CMAKE_CURRENT_SOURCE_DIR}/../data)
  + if ( ENV{SYS_TYPE} STREQUAL "bgqos_0" )
  +
  set_property(
  TARGET quest_regression
  APPEND_STRING PROPERTY LINK_FLAGS ${AXOM_ALLOW_MULTIPLE_DEFINITIONS}
  )
  + endif()
  +
  # Note: The following are all valid regression tests.
  # Most are commented out to avoid excessive test runtimes, especially in debug mode.
  set(quest_regression_datasets
  