/*
this is bill.c
*/
#include <stdio.h>
void bill(char *argv)
{
printf("bill: %s\n",argv);
}
/*
this is linus.c
*/
#include <stdio.h>
void linus(char *argv)
{
printf("linus: %s\n",argv);
}
/*
this is mylib.h
*/
void bill(char *);
void linus(char *);
/*
this is main program
*/
#include "mylib.h"
int main()
{
linus("Hello Word");
exit(0);
}
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ gcc -c bill.c linus.c
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ ls *.o
bill.o linus.o
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ ls
bill.c bill.o linus.c linus.o main.c mylib.h
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ gcc -c main.c
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ ls
bill.c bill.o linus.c linus.o main.c main.o mylib.h
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ gcc -o main main.o linus.o
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ ./main
linus: Hello Word
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ ar crv libmy.a bill.o linus.o
a - bill.o
a - linus.o
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ ls
bill.c bill.o libmy.a linus.c linus.o main main.c main.o mylib.h
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ ls libmy.a
libmy.a
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ nm main
080494dc d _DYNAMIC
080495b0 d _GLOBAL_OFFSET_TABLE_
080484a8 R _IO_stdin_used
w _Jv_RegisterClasses
080494cc d __CTOR_END__
080494c8 d __CTOR_LIST__
080494d4 d __DTOR_END__
080494d0 d __DTOR_LIST__
080484c4 r __FRAME_END__
080494d8 d __JCR_END__
080494d8 d __JCR_LIST__
080495d8 A __bss_start
080495cc D __data_start
08048460 t __do_global_ctors_aux
08048350 t __do_global_dtors_aux
080495d0 D __dso_handle
w __gmon_start__
0804845a T __i686.get_pc_thunk.bx
080494c8 d __init_array_end
080494c8 d __init_array_start
080483f0 T __libc_csu_fini
08048400 T __libc_csu_init
U __libc_start_main@@GLIBC_2.0
080495d8 A _edata
080495dc A _end
08048488 T _fini
080484a4 R _fp_hw
0804829c T _init
08048320 T _start
080495d8 b completed.5982
080495cc W data_start
U exit@@GLIBC_2.0
08048380 t frame_dummy
080483d0 T linus
080483a4 T main
080495d4 d p.5980
U printf@@GLIBC_2.0
fuqiang@fuqiang-laptop:~/linuxcexample/ch1$ nm libmy.a
bill.o:
00000000 T bill
U printf
linus.o:
00000000 T linus
U printf