升级Centos默认版本的gcc

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据说新版本的gcc有一些新的特性，而我的服务器居然还在使用很老很老的，额，4.4.7的gcc版本，因此我决定稍微升级一下，步骤记录如下：

[root@localhost gcc-5.2.0]# yum install bzip2   
[root@localhost gcc-5.2.0]# ./contrib/download_prerequisites
[root@localhost gcc-5.2.0]# mkdir /byrd/service/gcc  
[root@localhost gcc-5.2.0]# cd gmp 
[root@localhost gmp]# ./configure --prefix=/byrd/service/gcc/gmp
[root@localhost gmp]# make &&　make install
[root@localhost gmp]# cd ../mpfr
[root@localhost mpfr]# ./configure --prefix=/byrd/service/gcc/mpfr --with-gmp=/byrd/service/gcc/gmp
[root@localhost mpfr]# make && make install
[root@localhost mpfr]# cd ../mpc
[root@localhost mpc]# ./configure --prefix=/byrd/service/gcc/mpc --with-gmp=/byrd/service/gcc/gmp --with-mpfr=/byrd/service/gcc/mpfr
[root@localhost mpc]# make && make install
[root@localhost mpc]# cd ../isl
[root@localhost isl]# ./configure --prefix=/byrd/service/gcc/isl --with-gmp-prefix=/byrd/service/gcc/gmp 
[root@localhost isl]# make && make install
[root@localhost isl]# cd ..
[root@localhost gcc-5.2.0]# wget http://www.bastoul.net/cloog/pages/download/cloog-0.18.4.tar.gz
[root@localhost gcc-5.2.0]# tar -zxf cloog-0.18.4.tar.gz 
[root@localhost gcc-5.2.0]# cd cloog-0.18.4
[root@localhost cloog-0.18.4]# ./configure --prefix=/byrd/service/gcc/cloog --with-gmp-prefix=/byrd/service/gcc/gmp
[root@localhost cloog-0.18.4]# make && make install