gcc/g++安装配置

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Install Gcc 4.1

sudo apt-get install gcc-4.1

Set gcc 4.1 as default version

After that, use this command to list installed gcc in your Ubuntu:

ls /usr/bin/gcc*

and use this command to check which is default:

gcc -v

1.) Now, add alternatives for gcc:

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.4 40sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.1 30

run this command which lists available versions, then type a number to set default.

sudo update-alternatives --config gcc

There are 2 choices for the alternative gcc (providing /usr/bin/gcc).
Selection Path Priority Status
————————————————————
0 /usr/bin/gcc-4.4 40 auto mode
* 1 /usr/bin/gcc-4.1 30 manual mode
2 /usr/bin/gcc-4.4 40 manual mode

2.) add alternatives for g++, i486-linux-gnu-gcc, and i486-linux-gnu-g++ and set 4.1 as default:

update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.4 40update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.1 30update-alternatives --config g++

update-alternatives --install /usr/bin/i486-linux-gnu-gcc i486-linux-gnu-gcc /usr/bin/i486-linux-gnu-gcc-4.4 40update-alternatives --install /usr/bin/i486-linux-gnu-gcc i486-linux-gnu-gcc /usr/bin/i486-linux-gnu-gcc-4.1 30update-alternatives --config i486-linux-gnu-gcc

update-alternatives --install /usr/bin/i486-linux-gnu-g++ i486-linux-gnu-g++ /usr/bin/i486-linux-gnu-g++-4.4 40update-alternatives --install /usr/bin/i486-linux-gnu-g++ i486-linux-gnu-g++ /usr/bin/i486-linux-gnu-g++-4.1 30update-alternatives --config i486-linux-gnu-g++