Dropping unused functions out of linked file

[Brian Smith]

Dear GCC-Help,

Is there any way during the link or compile processes to drop out functions 
and variables that are not used? Part of my source code includes generic 
modules provided by another vendor and I only need about 30% of the code 
that is in those source files. The optimisation -Os does not drop them out 
and I can see no options in the link process to do this. I am using the 
MSP430 port of gcc though this seems to be a GCC thing rather than specific 
to the MSP430 port.

Any ideas?

Brian