ubuntu16.04如何升級gcc,例如到gcc4.8

1.) Press Ctrl+Alt+T 打開終端輸入設備

sudo add-apt-repository ppa:ubuntu-toolchain-r/test

2.) Then install gcc 4.8 and g++ 4.8:

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

3.) Once installed, run following commands one by one to use gcc 4.8 instead of previous version.

sudo update-alternatives --remove-all gcc 

sudo update-alternatives --remove-all g++

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 20

sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 20

sudo update-alternatives --config gcc

sudo update-alternatives --config g++

4.) 使用 gcc --version 查看是否安裝成功，

gcc (Ubuntu 4.8.1-2ubuntu1~13.04) 4.8.1

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