Default gcc is version 4.4.7
Centos 6 only support devtools with gcc/g++ 4.4.7
To see which version of gcc tools are set for your environment:
gcc --version
Software Collections
To install and use other versions, we use Software Collections. This provides a way to easily set up your environment to use a particular version of software that's not installed in a standard location.
The gcc collections below are available both on chead and on the nodes.
To see everything available with scl (Software Collections)
scl -l
To use a Software Collection, you invoke the scl command like below:
gcc 4.8.2
devtools-2 has been installed and includes gcc 4.8.2. To use it, run this command to enable it for your current login
scl enable devtoolset-2 bash
This will start a new shell that's set up for gcc 4.8.2. Run gcc –version to verify.
gcc 4.9.1
devtools-3 has been installed and includes gcc 4.9.1. To use it, run this command to enable it for your current login
scl enable devtoolset-3 bash
Alternately
For either version you can:
export CC=/opt/rh/devtoolset-[2 or 3]/root/usr/bin/gcc export CPP=/opt/rh/devtoolset-[2 or 3]/root/usr/bin/cpp export CXX=/opt/rh/devtoolset-[2 or 3]/root/usr/bin/c++
