The command line history of "tf" (MUD/MUCK client) behaves differently 
when compiled with RH7's gcc. To reproduce:

wget -nd http://ftp.tcp.com/pub/mud/Clients/tinyfugue/tf-40s1.tar.gz
tar xzf tf-40s1.tar.gz
cd tf-40s1
./unixmake install
(y)
bin/tf -n
(type: foo 1 (enter)(ctrl-p) foo 2 (enter)(ctrl-p) foo 3 (enter)(ctrl-p))
The history jumps back to foo 1 with every ctrl-p.

After "export CC=kgcc" and recompiling the history goes back to the 
previously entered string, which is the correct behaviour. So this seems 
to be a compiler problem with gcc-2.96-69 (and -79) to me.