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Removing unused functions and dead code
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To remove dead code, add the follow to your makefile::

    DEADCODESTRIP := -Wl,-static -fvtable-gc -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,-s

    foo : foo.c
        g++ $(DEADCODESTRIP) $< -o $@

Step by step...

-Wl,-static:
    Link against static libraries.  Required for dead-code elimination.

-fvtable-gc:
    C++ virtual method table instrumented with garbage collection information for the linker.

-fdata-sections:
    Keeps data in separate data sections, so they can be discarded if unused.

-ffunction-sections:
    Keeps funcitons in separate data sections, so they can be discarded if unused.

-Wl,--gc-sections:
    Tell the linker to garbage collect and discard unused sections.

-s:
    Strip the debug information, so as to make the code as small as possible.