hi,
found the following on my box (FC3):

rpm -qa glibc-common
glibc-common-2.3.4-2.fc3
glibc-common-2.3.3-74

rpm -qa glibc
glibc-2.3.3-74

what´s the best way to update glibc (because all of the dependencies)?
-force updating/installing of glibc-2.3.4 ?
-erase glibc-2.3.3 and then update to 2.3.4 ?

if new glibc is source the best is erase the old glibc and install new glibc

elseif the new glibc is not source the best is uninstall old glibc and update new glibc

else

force update

standard procedure is to overwrite. The problem is, if you remove the package from your system, nothing will work that is compiled with shared library support ( which is most things ). 2.3.3 isn't that old, why do you want to upgrade?

if you want to see what will break ( ) if you remove glibc, run ldd < command > to see what libraries that command needs to run, for example lets take "ls":

:~$ ldd /usr/bin/ls
librt.so.1 => /lib/librt.so.1 (0x40026000)
libc.so.6 => /lib/libc.so.6 (0x40038000)
libpthread.so.0 => /lib/libpthread.so.0 (0x40167000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

ls needs libc.so.6 (glibc) so ls will no longer work. you might be able to upgrade (rpm -Uvh) and it work ok just make sure you do not rpm -e glibc.

thx so far!
this morning I test it on another box.
dload the rpm´s and then:

rpm -Uhv --force glibc glibc-common glibc-headers glibc-devel

seems to work! :-)