G++ ABI compatibility document

[Shelly Adhikari]

Hello Guys,

I am trying to come up with an ABI compatibility document for different 
versions of GCC - starting from 3.0. Can anyone point out relevant bug 
reports/items in release notes. I also want to document ABI bugs which 
were fixed - which would cause incompatibilty among different versions 
of GCC for corner cases. The document would contain examples of the 
corner cases as well.

Made up example : 3.2.0 -> 3.2.1 C++ ABI changed for i686 for function 
pointers which take complex as arguments.

Is there a document already available somewhere?

TIA,
Shelly