Frank Chen wrote:
If I use rpmbuild -bb to build glibc, is the new glibc installed on the system?
No, not until you install the just-built glibc rpm's.
Also, when I want to install a new glibc rpm, would rpm -i be sufficient? Do I have to reboot the system afterwards?
Not that this is a good idea (replacing/upgrading glibc, unless you really know what you're doing), but you'd want to use
rpm -U -- Rex