centos7安装指定版本gcc和g++编译环境

一：在centos上安装gcc 和g++的自定义环境
    采用rpm 安装对应包

二：对应gcc版本安装 
相关库和对应的下载路径
qmp
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/gmp-4.3.1-13.el6.x86_64.rpm    
rpm -ivh gmp-4.3.1-13.el6.x86_64.rpm  -- 这个命令报错，存在相关的高版本存在
    rpm -e --nodeps gmp-4.3.1-13.el6.x86_64.rpm -- 强制安装对应的相关库

ppl
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/ppl-0.10.2-11.el6.x86_64.rpm
rpm -ivh ppl-0.10.2-11.el6.x86_64.rpm 

cloog
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/cloog-ppl-0.15.7-1.2.el6.x86_64.rpm
rpm -ivh cloog-ppl-0.15.7-1.2.el6.x86_64.rpm 

mpfr
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/mpfr-2.4.1-6.el6.x86_64.rpm
 rpm -ivh mpfr-2.4.1-6.el6.x86_64.rpm 

cpp
wget ftp://ftp.icm.edu.pl/vol/rzm3/linux-scientificlinux/6.8/x86_64/os/Packages/cpp-4.4.7-17.el6.x86_64.rpm
rpm -ivh cpp-4.4.7-17.el6.x86_64.rpm 

kernel-header
wget ftp://ftp.icm.edu.pl/vol/rzm3/linux-scientificlinux/6.5/x86_64/updates/security/kernel-headers-2.6.32-642.15.1.el6.x86_64.rpm
rpm -ivh kernel-headers-2.6.32-642.15.1.el6.x86_64.rpm