What is the deal with undefined symbols in a shared library or dylib?

Question

I have a Makefile for linux that I am porting over to Darwin. The makefile takes a bunch of .o files and links them together into a .so shared object. Okay, so I figured (

Answer 1

Use libtool.

libtool -dynamic -multiply_defined suppress -install_name `basename ../../../../rlp/lib/universal-darwin9-gcc40/libbtutils.dylib` -o ../../../../rlp/lib/universal-darwin9-gcc40/libbtutils.dylib   ../../../../rlp/lib/universal-darwin9-gcc40/libbtd.a ../../../../rlp/lib/universal-darwin9-gcc40/libbttrie.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtkey.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtunit.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtutilities.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtopts.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtxcode.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtprops.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtxml.a ../../../../rlp/lib/universal-darwin9-gcc40/libbttake3.a ../../../../rlp/lib/universal-darwin9-gcc40/libbttake5.a ../../../../rlp/lib/universal-darwin9-gcc40/libbtac.a  -lstdc++.6 -lgcc_s.10.4 ../../../../build_system/lib/universal-darwin9-gcc40/libgcc.a -lSystem -lSystemStubs`