[lld] Reading undefined symbols from dynamic objects

Mon Sep 2 14:36:48 PDT 2013

Hi all,
attached is a first try at cleaning up the symbol reading for ELF DSO
dependencies. Essentially, if a shared library defines a weak symbol,
it should not be entered into the symbol table. Otherwise another local
weak definition in the current object will be changed into undef.
This does not handle the case of a strong symbol in a DSO turning a weak
definition into undefined, but that seems to be a separate issue.

Joerg
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