问题：
/usr/bin/ld: base64.o: relocation R_X86_64_32S against `base' can not be used when making a shared object; recompile with -fPIC
base64.o: error adding symbols: 错误的值
collect2: error: ld returned 1 exit status
解决：
生成.o 文件的时候少加了参数-fPIC
gcc -fPIC -c -I"/usr/lib/jvm/jdk1.8.0_144/include" -I"/usr/lib/jvm/jdk1.8.0_144/" base64.c
