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As the other posters have said, there is some risk involved.
The book recommends a completely new install of LFS.
I have upgraded glibc twice within LFS and so far no issues. FWIW here is what I did: Back up the LFS partition (for me, /dev/sda17) on a usb stick using Clonezilla. Recompile binutils, coreutils, dbus, util-linux, Bash, and Systemd.It is a system wide change since it impacts glibc and application dependent on it. Glibc provides two files for Unicode data, UTF-8 and i18n. We are updating Glibc Unicode data from Unicode 5.1 to Unicode 7.0 version.It took a long time, since there was not much documentation on how to update Unicode data and also there was the chance of loosing backward compatibility.