Ubuntu 18.04 将gcc版本降级为5.5版本

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首先查看自己的gcc版本，Ubuntu18.04上默认的是7.3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.

1. 下载gcc/g++ 5

sudo apt-get install -y gcc-5
sudo apt-get install -y g++-5

2. 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++

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.