1、获取离线安装包：可以使用我已经下载好的包，链接:https://pan.baidu.com/s/1J-wVsAoTmfn_iiOnYSrmZA 密码:beee
mpfr-3.1.1-4.el7.x86_64.rpm
libmpc-1.0.1-3.el7.x86_64.rpm
kernel-headers-3.10.0-862.el7.x86_64.rpm
glibc-headers-2.17-222.el7.x86_64.rpm
glibc-devel-2.17-222.el7.x86_64.rpm
cpp-4.8.5-28.el7.x86_64.rpm
gcc-4.8.5-28.el7.x86_64.rpm
2、将这些包上传到待安装的系统中，执行安装命令：
rpm -ivh *.rpm --nodeps --force
3、如不嫌麻烦，也可以按如下顺序执行安装命令：
rpm -ivh mpfr-3.1.1-4.el7.x86_64.rpm
rpm -ivh libmpc-1.0.1-3.el7.x86_64.rpm
rpm -ivh kernel-headers-3.10.0-862.el7.x86_64.rpm
rpm -ivh glibc-headers-2.17-222.el7.x86_64.rpm
rpm -ivh glibc-devel-2.17-222.el7.x86_64.rpm
rpm -ivh cpp-4.8.5-28.el7.x86_64.rpm
rpm -ivh gcc-4.8.5-28.el7.x86_64.rpm
4、都安装成功后，验证
gcc -v 输出版本则安装成功
