how to make so/share library

$ gcc -o libx.so -fpic -shared libx.c # libx.c -> libx.so
$ ln -s x.h /usr/include/ayoub/x.h
$ ln -s libx.so /lib                  #
$ gcc -c main.c -o main.o             # main.c -> main.o
$ gcc -o main main.o -lx              # main.o +  mylib

how to use it in Makefile

just add -lx to cflags

Check for lib

to view the function that already define or undefine(need lib.so)

$ nm a.out

how to view shared lib from app

$ ldd a.aout