On 07/02/13 16:37, Mahmood Naderan wrote: > Hi > These are the installed gcc/g++ on my system > > > $ ls -l /usr/bin/g++* > lrwxrwxrwx 1 root root 7 Mar 13 2012 /usr/bin/g++ -> g++-4.6 > -rwxr-xr-x 1 root root 94808 Mar 16 2006 /usr/bin/g++-3.4 > lrwxrwxrwx 1 root root 52 Feb 6 23:32 /usr/bin/g++-4.1 -> /opt/gcc-4.1.2/host-x86_64-unknown-linux-gnu/gcc/g++ > -rwxr-xr-x 1 root root 263328 Apr 16 2012 /usr/bin/g++-4.4 > -rwxr-xr-x 1 root root 357312 Apr 16 2012 /usr/bin/g++-4.6 > > > The default g++ should point to g++-4.6, however: > > $ which g++ > /usr/local/bin/g++ > > > $ g++ -v > Using built-in specs. > Target: x86_64-unknown-linux-gnu > Configured with: ./configure --disable-multilib > Thread model: posix > gcc version 4.1.2 You have another g++ at /usr/local/bin/g++ And your PATH gives more priority to /usr/local/bin than /usr/bin > How can I change the default g++ to 4.6? > > Is it safe to create a symbolic link from /usr/local/bin/g++ to /usr/bin/g++ ? > Or there may be some libc incompatibilities? Yes, it is safe. Although you would have to decide what to do with the g++ binary you already have there. According to FHS, /usr/local is for use by the system administrator so you can change it at will, the system updater won't overwrite it.
