Linux learning jottings(2)-static or dynamic library

function library is divided into static library and dynamic library.

0x00. static function library

it was compiled into target file, so, its not needed at runtime.

Obviously, when the static library modified, you should recompile the application.

for example:

# Makefile
hello: main.c libhello.a
gcc -o hello main.c -L. -lhello
libhello.a: hello.o
ar cr libhello.a hello.o
hello.o: hello.c
gcc -c hello.c

libhello.a removed or not does not make any difference on the running of "hello"

0x01. dynamic function library

create dynamic function library

gcc -shared -fPCI -o libhello.so hello.o

0x02.