[Gcc] Multiple version of gcc

[Gcc] Multiple version of gcc 

1.

Check softlink of gcc or g++

which gcc or which g++

(which will search gcc in $PATH. Please type env | grep PATH will see what path include)

Fedora  /usr/lib/ccache/gcc

ubuntu /usr/bin

2. 

Change softlink to different version of gcc

cd /usr/lib/ccache/gcc

rm gcc g++ cc

ln -sf /home/opt/bin/gcc4.4.2 gcc

ln -sf /home/opt/bin/gcc4.4.2 cc

ln -sf /home/opt/bin/g++4.4.2 g++

3.

vim /etc/profile

setenv LD_LIBRARY_PATH /home/opt/lib:$LD_LIBRARY_PATH

restart

Reference :

• 
  Having multiple versions of GCC


• 
  fedora 下多版本gcc共存