http://stackoverflow.com/questions/7832892/how-to-change-the-default-gcc-compiler-in-ubuntu
To figure out the current priorities of gcc, type in the command pointed out by @tripleee's comment:
查看當前的可切換的版本： update-alternatives --query gcc
例如有 4.6 4.5 兩個版本
update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.6 100 update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.5 50 update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 100 update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.5 50 update-alternatives --install /usr/bin/cpp cpp-bin /usr/bin/cpp-4.6 100 update-alternatives --install /usr/bin/cpp cpp-bin /usr/bin/cpp-4.5 50
設置爲4.5
update-alternatives --set g++ /usr/bin/g++-4.5update-alternatives --set gcc /usr/bin/gcc-4.5update-alternatives --set cpp-bin /usr/bin/cpp-4.5
Here, 4.6 is still the default (aka "auto mode"), but I explicitly switch to 4.5 temporarily (manual mode). To go back to 4.6:
update-alternatives --auto g++ update-alternatives --auto gcc update-alternatives --auto cpp-bin
方法二：
echo 'export CXX=/usr/bin/gcc-4.5' >> ~/.bashrc
移除當前的選擇可以這樣
First erased the current update-alternatives setup for gcc and g++:
sudo update-alternatives --remove-all gcc sudo update-alternatives --remove-all g++
Install PackagesIt seems that both gcc-4.3 and gcc-4.4 are installed after install build-essential. However, we can explicitly install the following packages:sudo apt-get install gcc-4.3 gcc-4.4 g++-4.3 g++-4.4 |
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First erased the current update-alternatives setup for gcc and g++: sudo update-alternatives --remove-all gcc sudo update-alternatives --remove-all g++ Install Packages It seems that both gcc-4.3 and gcc-4.4 are installed after install build-essential. However, we can explicitly install the following packages: sudo apt-get install gcc-4.3 gcc-4.4 g++-4.3 g++-4.4 |
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