1、下载GCC5.3.0安装包

#su

#cd /opt

#wget http://ftp.gnu.org/gnu/gcc/gcc-5.3.0/gcc-5.3.0.tar.gz

2、解压

#tar -zxf gcc-5.3.0.tar.gz

3、创建安装目录

#mkdir /usr/local/gcc-5.3.0/

#cd /usr/local/gcc-5.3.0/

4、配置安装

#/opt/gcc-5.3.0/configure -prefix=/usr/local/gcc-5.3.0

如果出现如下错误：

说明缺少依赖库GMP、MPFR、MPC，可以从ftp://gcc.gnu.org/pub/gcc/infrastructure/下载，按下面顺序安装。

⑴ 安装GMP4.3.2

#cd /opt

#wget ftp://gcc.gnu.org/pub/gcc/infrastructure/gmp-4.3.2.tar.bz2

#tar jxvf gmp-4.3.2.tar.bz2

#mkdir /usr/local/gmp-4.3.2

#cd /usr/local/gmp-4.3.2

#/opt/gmp-4.3.2/configure -prefix=/usr/local/gmp-4.3.2

#make

#make install

⑵ 安装MPFR2.4.2

#cd /opt

#wget ftp://gcc.gnu.org/pub/gcc/infrastructure/mpfr-2.4.2.tar.bz2

#tar jxvf mpfr-2.4.2.tar.bz2

#mkdir /usr/local/mpfr-2.4.2

#cd /usr/local/mpfr-2.4.2

#/opt/mpfr-2.4.2/configure --prefix=/usr/local/mpfr-2.4.2 --with-gmp=/usr/local/gmp-4.3.2

#make

#make install

⑶ 安装MPC0.8.1

#cd /opt

#wget ftp://gcc.gnu.org/pub/gcc/infrastructure/mpc-0.8.1.tar.gz

#tar -zxf mpc-0.8.1.tar.gz

#mkdir /usr/local/mpc-0.8.1

#cd /usr/local/mpc-0.8.1

#/opt/mpc-0.8.1/configure --prefix=/usr/local/mpc-0.8.1 --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2

#make

#make install

5、再次配置GCC安装配置选项

#cd /usr/local/gcc-5.3.0

#/opt/gcc-5.3.0/configure --prefix=/usr/local/gcc-5.3.0 -enable-threads=posix -disable-checking -disable-multilib -enable-languages=c,c++ --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2 --with-mpc=/usr/local/mpc-0.8.1

6、编译

#make

大约半小时编译完成......

7、安装

#make install

8、软链接

#ln -s /usr/local/gcc-5.3.0/bin/gcc gcc 
#ln -s /usr/local/gcc-5.3.0/bin/g++ g++

9、添加环境变量

# vim /etc/bashrc

添加如下代码：

#gcc

LD_LIBRARY_PATH=:/usr/local/mpc-0.8.1/lib:/usr/local/gmp-4.3.2/lib:/usr/local/mpfr-2.4.2/lib:/usr/local/gcc-5.3.0/lib:/usr/local/gcc-5.3.0/lib64

#export LD_LIBRARY_PATH

安装完毕！