联网的情况下直接使用命令yum -y install gcc 安装，不能联网就需要离线安装了。
百度云盘链接gcc和gcc-c++离线安装包：
链接：https://pan.baidu.com/s/1vQlRQoTmaeF9rqrHjLAl9g 提取码：cb8g安装gcc 获取离线安装包
注：如需各种rpm包可以从这两个个地方获取： http://mirrors.163.com/centos/6/os/x86_64/Packages/ http://mirrors.aliyun.com/centos/7/os/x86_64/Packages/
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执行安装命令
rpm -ivh *.rpm --nodeps --force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查看版本
gcc -v安装gcc-c++ 组件下载 执行安装
rpm -ivh *.rpm --nodeps --force
