Index: llvm-toolchain-9_9.0.0/openmp/runtime/src/CMakeLists.txt
===================================================================
--- llvm-toolchain-9_9.0.0.orig/openmp/runtime/src/CMakeLists.txt
+++ llvm-toolchain-9_9.0.0/openmp/runtime/src/CMakeLists.txt
@@ -170,7 +170,8 @@ endif()
 
 # Linking command will include libraries in LIBOMP_CONFIGURED_LIBFLAGS
 libomp_get_libflags(LIBOMP_CONFIGURED_LIBFLAGS)
-target_link_libraries(omp ${LIBOMP_CONFIGURED_LIBFLAGS} ${CMAKE_DL_LIBS})
+target_link_libraries(omp ${LIBOMP_CONFIGURED_LIBFLAGS} ${CMAKE_DL_LIBS}
+  "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/exports_so.txt")
 
 # Create *.inc before compiling any sources
 # objects depend on : .inc files