基于安装eda工具vcs的需要,特地记录ubuntu-18,gcc以及g++版本的降级4.4:
gcc -v

vim /etc/apt/sources.list

deb http://dk.archive.ubuntu.com/ubuntu/ trusty main universe
deb http://dk.archive.ubuntu.com/ubuntu/ trusty-updates main universe

sudo apt-get update

apt-get install gcc-4.4

ls /usr/bin/gcc*

update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.4 100

gcc -v

同理安装g++
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