First of all, you must discover where are your 4.8 binaries of all the tools:
$ which gcc-4.8
/usr/bin/gcc-4.8
$ which g++-4.8
/usr/bin/g++-4.8
$ ls /usr/bin/*-4.8
/usr/bin/cpp-4.8 /usr/bin/x86_64-linux-gnu-cpp-4.8
/usr/bin/g++-4.8 /usr/bin/x86_64-linux-gnu-g++-4.8
/usr/bin/gcc-4.8 /usr/bin/x86_64-linux-gnu-gcc-4.8
/usr/bin/gcc-ar-4.8 /usr/bin/x86_64-linux-gnu-gcc-ar-4.8
/usr/bin/gcc-nm-4.8 /usr/bin/x86_64-linux-gnu-gcc-nm-4.8
/usr/bin/gcc-ranlib-4.8 /usr/bin/x86_64-linux-gnu-gcc-ranlib-4.8
/usr/bin/gcov-4.8
So, we have all our binaries, now lets see if some symlinks are available for such binaries:
$ cd /usr/bin
$ ls -l gcc* cpp g++
lrwxrwxrwx 1 root root 7 sep 18 14:02 cpp -> cpp-4.7
lrwxrwxrwx 1 root root 7 abr 22 2013 g++ -> g++-4.7
lrwxrwxrwx 1 root root 7 sep 18 14:02 gcc -> gcc-4.7
As we can see, only cpp
, g++
and gcc
has symbolic links. We have two options here.
Symlinking
We replace the symlinks with ours, removing the actuals first:
sudo rm /usr/bin/cpp /usr/bin/gcc /usr/bin/g++
Then creating ours
sudo ln -s /usr/bin/cpp-4.8 /usr/bin/cpp
sudo ln -s /usr/bin/gcc-4.8 /usr/bin/gcc
sudo ln -s /usr/bin/g++-4.8 /usr/bin/g++
To revert it back use the same commands but with 4.7 or 4.6 instead
sudo rm /usr/bin/cpp /usr/bin/gcc /usr/bin/g++
sudo ln -s /usr/bin/cpp-4.7 /usr/bin/cpp
sudo ln -s /usr/bin/gcc-4.7 /usr/bin/gcc
sudo ln -s /usr/bin/g++-4.7 /usr/bin/g++