documentation of g++ name mangling

["Kellogg, Oliver" <Oliver dot Kellogg at vs dot dasa dot de>]

Hi,

In the name mangling explanations of the G++ Internals 
document (http://gcc.gnu.org/onlinedocs/gxxint_1.html#SEC29),
I read:

" The letters `G', `M', `O', and `p' also seem to be used for obscure
purposes ... "

I found the letter G to be generated on a fairly common 
occasion (structs as parameters to methods.)

Is there hope that this will be documented some time?

(Motivation:
 I'm trying to write a tool that automatically 
 produces GNAT interfacing code to G++ compiled methods, 
 and therefore need to know the exact mangled names.)

Thanks.

-- oliver dot kellogg at vs dot dasa dot de