查找gcc版本
apt search gcc > gcc.txt
apt-cache search gcc
aptitude search gcc
通过以上指令可以查看有哪些gcc版本可供下载
从gcc.txt中搜索gcc-会看到各个版本的gcc, 选择自己想安装, 不存在则切换镜像源
切换到国内的源
切换到国内的源是因为国内镜像下载速度快, 另一个原因是可能不存在想要的gcc版本
备份下载源
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
选择镜像源
sudo vim /etc/apt/sources.list
清华大学镜像源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal universe
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates universe
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security universe
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security multiverse
中科大镜像源
deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted
deb https://mirrors.ustc.edu.cn/ubuntu/ focal universe
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates universe
deb https://mirrors.ustc.edu.cn/ubuntu/ focal multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security universe
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security multiverse
阿里云镜像源
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted
deb http://mirrors.aliyun.com/ubuntu/ focal universe
deb http://mirrors.aliyun.com/ubuntu/ focal-updates universe
deb http://mirrors.aliyun.com/ubuntu/ focal multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted
deb http://mirrors.aliyun.com/ubuntu/ focal-security universe
deb http://mirrors.aliyun.com/ubuntu/ focal-security multiverse
在此我选择阿里云的源
更新
sudo apt update
指定版本安装
sudo apt install gcc-7 g++-7
查看已安装的版本
dpkg -l | grep gcc | awk '{print $2}'
擦除掉软链接
sudo update-alternatives --remove-all gcc
sudo update-alternatives --remove-all g++
创建软链接信息
格式:
sudo update-alternatives: --install <链接> <名称> <路径> <优先级>
# gcc
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 2
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 1
# g++
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 2
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-13 1
切换gcc版本
sudo update-alternatives --config gcc
