Question about duplicate C++ functions generated with GNU 3.4.1

[Nathan Sidwell]

Ramadass, Ramanathan wrote:
>>It is to do with ctors-for-most-derived and ctors-for-base.
> 
> 
> Could you please elaborate on this? I too have been trying to understand
> why two copies of ctors are getting created but could never find any
> explanation. As you suggested, i browsed through the ABI but still
> haven't found anything(so far). From your remark;

http://www.codesourcery.com/cxx-abi/abi.html#vtable-ctor
and http://www.codesourcery.com/cxx-abi/abi.html#obj-ctor
talks about it, but probably not in the most enlightening terms.

> Can i infer that it has to do with the initialization of the pointer to
> the virtual base class in a derived object? Somewhere in lippman's
> "Inside the C++ object model" i had read that the ctor inits this
> pointer. Not sure that it is related. Would appreciate it if you(or
> somebody else) could throw some light on this.

that presumes a particular ABI implementation, which is now incorrect for
g++   However the basic idea is the same.

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk