2020-11-19 ubuntu18.04安装gcc5.4

ubuntu18.04安装gcc5.4

https://blog.csdn.net/CAU_Ayao/article/details/83987120
1， 查看自己的版本

gcc --version
gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
Copyright (C) 2017 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.

2. 下载gcc/g++ 5
   sudo apt-get install -y gcc-5
   sudo apt-get install -y g++-5

3. 链接gcc/g++实现降级
   cd /usr/bin
   sudo rm gcc
   sudo ln -s gcc-5 gcc
   sudo rm g++
   sudo ln -s g++-5 g++

4. 再次查看gcc版本，可以看到已经降级.

gcc --version
gcc (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010
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.