Any way to compile an old version from git?

[Karel Gardas]

On 05/18/11 12:09 PM, Simon Marlow wrote:
>> The real difficulty with the ghc sources is that fact that
>> over a dozen different trees, with independant commit histories
>> are needed to retrieve a working revision.
>
> Right, this is something that would be fixed by using submodules or
> subtree merging.

If I understand well your arguments about submodules in the past, this 
is something we will not see in the near future. However ability to grab 
some known tree of the history would be great, for me too as I'm hit by 
#5201, so I like Ben's suggestion of buildbots printing kind of tree 
identification. Perhaps doing something like:

git log|head -1

inside the cloned tree for ghc git repo and also for all the git repos 
got by sync-all is something which might help here a little bit and 
should not be that hard to implement in builder server?

Thanks,
Karel