centos 7 下使用高版本gcc编译安装

# yum 换国内镜像
sed -e 's|^mirrorlist=|#mirrorlist=|g' \
         -e 's|^#baseurl=http://mirror.centos.org/centos|baseurl=https://mirrors.ustc.edu.cn/centos|g' \
         -i.bak \
         /etc/yum.repos.d/CentOS-Base.repo
yum makecache
yum install -y centos-release-scl
yum install -y epel-release
yum install -y openssl-devel 
yum install -y libcurl-devel 
yum install -y libevent-devel 
yum install -y devtoolset-7-gcc*
source /opt/rh/devtoolset-7/enable  #使能编译环境   如果长期