nm *.o */*.o |grep 'U ' | awk '{print $$2}' | sort -u > nmused.txt
nm *.o */*.o |grep 'T ' | awk '{print $$3}' | sort -u > nmfns.txt
comm -13 nmused.txt nmfns.txt
nm *.o */*.o |grep 'U ' | awk '{print $$2}' | sort -u > nmused.txt
nm *.o */*.o |grep 'T ' | awk '{print $$3}' | sort -u > nmfns.txt
comm -13 nmused.txt nmfns.txt