Any way to compile an old version from git?

[Simon Marlow]

On 18/05/2011 11:41, Karel Gardas wrote:
> 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?

I just added a log command to sync-all, so you can now say

$ ./sync-all log HEAD^.. --pretty=oneline

to get the hashes of all the repos.  I've added that to my nightly build 
script too, when Ian returns he can add it to the main nightly builders.

Cheers,
	Simon