Create a Static Library
create object file
gcc -c -o test.o test.c
create a static library from object file
ar rcs libtest.a test.o
create the executable file
gcc -o program program.o libtest.a
gcc -o program program.o -L. -ltest
-L.: add local directory to the lib path.
-ltest: link the libtest.a static library.
Difference between static library and dynamic library
Static library link all required functions or libraries into the executable file, while dynamic libraries are linked during running time.
In Linux, static library is named *.a, dynamic library is named *.so.
In Windows, static library is named *.lib, dynamic library is named *.dll.
Add another to our library
ar rcs libtest.a test.o test2.o