[gentoo-hardened] Tool for eliminating non used code or symbols?

[Kfir Lavi]

Hi,
I'm looking for a way to reduce glibc code size.
It can be a way to make system smaller and minimize the impact
of attack vectors in glibc, as in return-to-libc attack.

Lets say I'm deleting the program 'mkdir', and mkdir uses a function
in glibc that non of the other parts of the system uses.
Then I want to eliminate this function from glibc. This leads to smaller
code and if this function is used in some attack scenario, maybe prevent it.

Is there a way to do it?
Can you help me think how to build a tool like this? or, integrate
with existing tools.

Thanks,
Kfir