Re: Patch: RFC: gcj versioning on head

[Bryce McKinlay <mckinlay at redhat dot com>]

Tom Tromey wrote:

> Andrew pointed out that the existing gcj ABI versioning code broke as
> soon as the trunk was renamed 4.1.  I had done this "kind of on
> purpose", knowing that we would be breaking ABI compatibility on head
> at least once.
>
> However, it is more convenient to manage this manually... since we
> haven't actually broken compatibility yet, it is nice to be able to
> switch back and forth between 4.0 and 4.1 without recompiling objects.
>  
Yes, very much so. I think we should try and maintain compatibility 
wherever possible from now on. Perhaps this won't really be possible 
until 4.1, but it should be an interesting excercise, at least, to start 
putting in backwards compatiblity code if we start making incompatible 
changes.

> On the runtime side we do something similar.  However, I expect we may
> manage the runtime somewhat differently; for instance we may choose to
> accept several different versions of the BC ABI.
>
> I thought I'd post this for commentary before checking it in.
> I'll put it in sometime next week unless there are
> objections/suggestions/etc.
>  
Looks good to me.

Bryce