[cxx-abi-dev] ABI modification for exception propagation

[Mark Mitchell]

Sebastian Redl wrote:
> Mark Mitchell wrote:
>> Ideally, it should be possible to freely mix old and new object files 
>> in a single application.  It should be possible to throw an exception 
>> in an old file and catch it in a new one, and vice versa.
> Hmm, I think that's not possible. Definitely not in the separation 
> model.

If true, that's very unfortunate.  C++ has gotten a somewhat 
well-deserved black eye by not maintaining binary compatibility over 
time.  If you've needed about long-term binary compatibility, C has been 
a better choice for a long time.  The C++ ABI was designed in part to 
put an end to that problem.  I would hope that we could extend the ABI 
in a way that would permit old code to continue to work, without

Is the issue that current_exception may need additional information in 
order to locate the copy constructor for the thrown object.  Is that the 
issue?

Thanks,

-- 
Mark Mitchell
CodeSourcery
mark at codesourcery.com
(650) 331-3385 x713