-fdump-translation-unit considered harmful

[Paul Brook]

> | Me ranting about -fdump-translation-unit had nothing to do with your
> | problem, really, it's just that your message reminded me that I was
> | going to bring that up.
>
> I think -fdump-translation-unit should remain.  I thereby volunteer to
> take any question about it.

Ok: Where can I find the documentation for it?

Given this is intended for third party utilities it should be a stable and 
well documented interface, right?

Paul