2018-09-30Linux动态库使用

1.生成so

gcc -shared -o libmyCalc.so *.o

2。生成myAPp

[root@localhost c]# gcc main.c -Iinclude -L./lib -lmyCalc -o myapp

[root@localhost c]# ll

total 36

drwxr-xr-x. 2 root root  25 Jul 11 07:43 lib

-rw-r--r--. 1 root root 1646 Jul 11 06:33 libmy.a

-rwxr-xr-x. 1 root root 8001 Jul 11 06:27 libmyCalc.so

-rw-r--r--. 1 root root 1646 Jul 11 04:21 libmytest.a

-rw-r--r--. 1 root root  118 Jul 11 04:20 main.c

-rw-r--r--. 1 root root 1504 Jul 11 06:32 main.o

-rwxr-xr-x. 1 root root 8510 Jul 11 07:43 myapp

[root@localhost c]# ldd myapp

linux-vdso.so.1 =>  (0x00007fff11ffd000)

libmyCalc.so => not found

libc.so.6 => /lib64/libc.so.6 (0x00007f01da8fd000)

/lib64/ld-linux-x86-64.so.2 (0x00007f01dacc8000)

[root@localhost c]#

3.引用动态库

[root@localhost c]# export LD_LIBRARY_PATH=./lib

[root@localhost c]# ldd myapp

linux-vdso.so.1 =>  (0x00007ffdb3df9000)

libmyCalc.so => ./lib/libmyCalc.so (0x00007f2f2ca4c000)

libc.so.6 => /lib64/libc.so.6 (0x00007f2f2c682000)

/lib64/ld-linux-x86-64.so.2 (0x00007f2f2cc4f000)

[root@localhost c]#

4.永久添加

~目录的   vi .bashrc   

vi .bashrc  把固定路由写进去

export LD_LIBRARY_PATH=/home/c/lib