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.