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#-----------------------------------------
# to enable newer gcc from software collections:
# (replace devtoolset-46 with current version of devtoolset)
#-----------------------------------------
if [ -x /opt/rh/devtoolset-46/enable ]; then
  echo Enabling GCC from Developer Toolset
  source /opt/rh/devtoolset-46/enable
fi

To use the newer versions on the command line after the RPMs are installed :(this example is from devtoolset-4, but the same idea works for devtoolset-6)

user@host $ scl enable devtoolset-4 bash
bash-4.1$ gcc --version
gcc (GCC) 5.2.1 20150902 (Red Hat 5.2.1-2)
bash-4.1$ exit

ksa@iris02 $ scl enable devtoolset-4 'gcc --version'
gcc (GCC) 5.2.1 20150902 (Red Hat 5.2.1-2)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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