You can install a devtoolset[1] to get a newer GCC which keeps ABI compatibility. I'm using gcc 6.2.1 on CentOS 7 that way.
[1]: https://www.softwarecollections.org/en/scls/rhscl/devtoolset...
[1]: https://www.softwarecollections.org/en/scls/rhscl/devtoolset...