Ubuntu 18.04安装gcc、g++ 4.8

安装：

直接使用命令安装

sudo apt-get install gcc-4.8 g++-4.8

查看是否安装好了

ls /usr/bin/gcc*

结果：

/usr/bin/g++  
/usr/bin/g++-4.8  
/usr/bin/gcc  
/usr/bin/gcc-4.8  
/usr/bin/gcc-ar-4.8  
/usr/bin/gcc-nm-4.8  
/usr/bin/gcc-ranlib-4.8

应用：

应用gcc

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 100
sudo update-alternatives --config gcc

检查gcc

gcc --version

结果：

gcc (Ubuntu 4.8.5-4ubuntu8) 4.8.5
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

应用g++

sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 100
sudo update-alternatives --config g++

检查g++

g++ --version

结果：

g++ (Ubuntu 4.8.5-4ubuntu8) 4.8.5
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.