linux 离线安装gcc++ (简单易懂,已成功安装):
autogen-libopts-5.18-5.el7.x86_64.rpm
gcc-c++-4.8.5-28.el7.x86_64.rpm
keyutils-libs-devel-1.5.8-3.el7.x86_64.rpm
krb5-devel-1.15.1-18.el7.x86_64.rpm
libcom_err-1.42.9-11.el7.x86_64.rpm
libselinux-devel-2.5-12.el7.x86_64.