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If you need cutting-edge, CentOS is probably not the distro for you. It lags WAY behind the curve so that everything is debugged and proven stable before being incorporated into the standard repo. Either way, you're going to need a basic gcc installation before you can use gcc to build anything else from source. Use yum to install the standard gcc/glibc, and then you can use that to build the new release.
Just a warning, if you try to install a new glibc over your existing one, you will probably break your system to the point where a reinstall is required. As knudfl indicates, glibc comprises the core libraries of your system, against which most if not all other programs are linked. If you replace it, many basic system utilities (ls, pwd, bash, etc.) wll stop working in funny ways. As mentioned, you can install a new glibc in an alternate location, but it might help us to know why you need a newer glibc than is provided.