Index: llvm/cmake/modules/AddLLVM.cmake
===================================================================
--- llvm/cmake/modules/AddLLVM.cmake
+++ llvm/cmake/modules/AddLLVM.cmake
@@ -103,11 +103,7 @@
     # FIXME: Don't write the "local:" line on OpenBSD.
     # in the export file, also add a linker script to version LLVM symbols (form: LLVM_N.M)
     add_custom_command(OUTPUT ${native_export_file}
-      COMMAND echo "LLVM_${LLVM_VERSION_MAJOR} {" > ${native_export_file}
-      COMMAND grep -q "[[:alnum:]]" ${export_file} && echo "  global:" >> ${native_export_file} || :
-      COMMAND sed -e "s/$/;/" -e "s/^/    /" < ${export_file} >> ${native_export_file}
-      COMMAND echo "  local: *;" >> ${native_export_file}
-      COMMAND echo "};" >> ${native_export_file}
+      COMMAND "${Python3_EXECUTABLE}" ${LLVM_MAIN_SRC_DIR}/utils/add_llvm_symbol_exports.py ${LLVM_VERSION_MAJOR} ${export_file} ${native_export_file}
       DEPENDS ${export_file}
       VERBATIM
       COMMENT "Creating export file for ${target_name}")
Index: llvm/utils/add_llvm_symbol_exports.py
===================================================================
--- /dev/null
+++ llvm/utils/add_llvm_symbol_exports.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+
+if(len(sys.argv) != 4):
+	print('usage: ' + sys.argv[0] + ' <LLVM major version> <input> <output>')
+	sys.exit(1)
+
+with open(sys.argv[3], 'w') as out_fd:
+        out_fd.write('LLVM_' + sys.argv[1] + ' {\n')
+        if os.stat(sys.argv[2]).st_size > 0:
+                out_fd.write('  global:\n')
+                with open(sys.argv[2], 'r') as in_fd:
+                        for e in in_fd.readlines():
+                                out_fd.write('    ' + e.rstrip() + ';\n')
+        out_fd.write('  local: *;\n};\n')
+
+sys.exit(0)