Use the armlink option
generate a symdefs file.
The linker produces a symdefs file during a successful final link stage. It is not produced for partial linking or for unsuccessful final linking.
not exist, the file is created containing all the global symbols.
existing contents of
used to select the symbols that are output when the linker rewrites
the file. This means that only the existing symbols in the filename
are updated, and no new symbols (if any) are added at all. If you
do not want this behavior, ensure that any existing symdefs file
is deleted before the link step.