C语言全局变量那些事儿(2)(3)

printf("t1:\t(&b)=0x%08x\n\t(&c)=0x%08x\n

\tsizeof(b)=%d\n\tb=%d\n\tc=%d\n",

&b, &c, sizeof b, b, c);

sleep(1);

}

return 0;

}

/* t2.c */

#include <stdio.h>

int b;

int c;

int t2()

{

printf("t2:\t(&b)=0x%08x\n\t(&c)=0x%08x\n

\tsizeof(b)=%d\n\tb=%d\n\tc=%d\n",

&b, &c, sizeof b, b, c);

return 0;

}

Makefile脚本：

export LD_LIBRARY_PATH:=.

all: test

./test

test: t1.o t2.o

gcc -shared -fPIC -o libfoo.so foo.c

gcc -o test t1.o t2.o -L. -lfoo

t1.o: t1.c

t2.o: t2.c

.PHONY:clean

clean:

rm -f *.o *.so test*

执行结果：

./test

t2: (&b)=0x0804a01c

(&c)=0x0804a020

sizeof(b)=4