Gcc多版本安装和切换_gcc 切换版本

添加本地source

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
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安装 gcc9 和 g++9（ubuntu18.04）

sudo apt-get install gcc-9 gcc-9-multilib g++-9 g++-9-multilib
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安装 gcc13 和 g++13（ubuntu22.04）

sudo apt install gcc-13 -y
sudo apt install g++-13 -y
sudo apt install gcc-13-multilib -y
sudo apt install g++-13-multilib -y
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添加和修改默认配置

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 80
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-9 80
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注：最后那个数字代表优先级，默认选优先级高的，数字越小优先级越高。

sudo update-alternatives --config gcc出现下列类似信息

  选择      路径            优先级  状态
------------------------------------------------------------
* 0            /usr/bin/gcc-9  90        自动模式
  1            /usr/bin/gcc-8  50        手动模式
  2            /usr/bin/gcc-9  90        手动模式
  3            /usr/bin/gcc-7  30        手动模式
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要维持当前值[*]请按回车键，或者键入选择的编号：

输入需要作为默认编辑器的gcc版本的编号 1-3
gcc

sudo update-alternatives --config gcc
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g++

sudo update-alternatives --config g++
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删除已有配置，如果想删除可选项的话可以键入以下指令：

sudo update-alternatives --remove gcc /usr/bin/gcc-9
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当前版本确认

gcc --version
g++ --version
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参考：

• https://blog.csdn.net/qq_39779233/article/details/105124478
• https://blog.csdn.net/u013187057/article/details/84996127
• https://tuxamito.com/wiki/index.php/Installing_newer_GCC_versions_in_Ubuntu

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➜  /home/mi/local/n62-4.0 sudo update-alternatives --config gcc
There are 4 choices for the alternative gcc (providing /usr/bin/gcc).

  Selection    Path             Priority   Status
------------------------------------------------------------
  0            /usr/bin/gcc-9    50        auto mode
  1            /usr/bin/gcc-10   45        manual mode
  2            /usr/bin/gcc-11   40        manual mode
* 3            /usr/bin/gcc-13   35        manual mode
  4            /usr/bin/gcc-9    50        manual mode

Press <enter> to keep the current choice[*], or type selection number:  
➜  /home/mi/local/n62-4.0 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc 30                                          
➜  /home/mi/local/n62-4.0 sudo update-alternatives --config gcc
➜  /home/mi/local/n62-4.0 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 30 --slave /usr/bin/g++ g++ /usr/bin/g++-11
➜  /home/mi/local/n62-4.0 sudo update-alternatives --config gcc
There are 4 choices for the alternative gcc (providing /usr/bin/gcc).

  Selection    Path             Priority   Status
------------------------------------------------------------
  0            /usr/bin/gcc-9    50        auto mode
  1            /usr/bin/gcc-10   45        manual mode
  2            /usr/bin/gcc-11   30        manual mode
* 3            /usr/bin/gcc-13   35        manual mode
  4            /usr/bin/gcc-9    50        manual mode

Press <enter> to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/bin/gcc-11 to provide /usr/bin/gcc (gcc) in manual mode
➜  /home/mi/local/n62-4.0 gcc --version
gcc (Ubuntu 11.4.0-2ubuntu1~20.04) 11.4.0
Copyright (C) 2021 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.

➜  /home/mi/local/n62-4.0 g++ --version
g++ (Ubuntu 11.4.0-2ubuntu1~20.04) 11.4.0
Copyright (C) 2021 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.

➜  /home/mi/local/n62-4.0 sudo update-alternatives --config gcc
There are 4 choices for the alternative gcc (providing /usr/bin/gcc).

  Selection    Path             Priority   Status
------------------------------------------------------------
  0            /usr/bin/gcc-9    50        auto mode
  1            /usr/bin/gcc-10   45        manual mode
* 2            /usr/bin/gcc-11   30        manual mode
  3            /usr/bin/gcc-13   35        manual mode
  4            /usr/bin/gcc-9    50        manual mode

Press <enter> to keep the current choice[*], or type selection number: ^C
➜  /home/mi/local/n62-4.0 
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