Requirements for throwning C++ exceptions from one shared library to another in gcc 4.1.0?

[Glenn Serre]

Good evening, 

Would someone know what I need to do to successfully throw C++
exceptions from one shared library to another shared library?  In
particular, 

- can I use a statically-linked libstdc++ (in both libraries), or must I
use a 
  a shared libstdc++ for both?  

- Is there any circumstance under which I can use -static-libgcc, or
must I 
  use -shared-libgcc?  The manual seems pretty clear on this, but it
doesn't 
  hurt (much) to ask. 

- Why is -shared-libgcc required (assuming it is)?  A pointer to source,
FAQ, 
  documentation, etc. would be welcome here.  I ask this final question
only 
  because I'd like to know exactly how throwing exceptions across shared

  libraries works and I'm looking for a place to start my research.  

Thanks in advance for any pointers to documentation, comments, tips,
etc. 

--Glenn S.