out.txt

$ make libab.so
gcc -Wall -fPIC -fvisibility=hidden   -c -o filea.o filea.c
gcc -Wall -fPIC -fvisibility=hidden   -c -o fileb.o fileb.c
gcc -Wall -fPIC -fvisibility=hidden -shared -o libab.so filea.o fileb.o

$ strip --strip-all --discard-all libab.so 

$ objdump -T libab.so  | grep get
Exit 1

$ LD_LIBRARY_PATH=. ./test
./test: symbol lookup error: ./test: undefined symbol: ab_get_string