-- a/cmake/modules/HandleLLVMOptions.cmake 2017-11-25 23:31:33.783350059 +1000
++ b/cmake/modules/HandleLLVMOptions.cmake 2017-11-25 23:32:31.159344454 +1000
${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" OR
${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD") AND
NOT LLVM_USE_SANITIZER)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs -Wl,-z,nodelete")
endif()