how to checkout proper submodules

[Mateusz Kowalczyk]

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On 05/06/13 02:46, Johan Tibell wrote:
> Unfortunately we don't use submodules for all repos e.g. base. This
> makes it very hard to accurately check out a previous state and
> bisect errors unfortunately.
> 
> 
> On Tue, Jun 4, 2013 at 6:07 PM, Kazu Yamamoto <kazu at iij.ad.jp>
> wrote:
> 
>> Hi,
>> 
>> Andreas and I found that the new IO manager is not working
>> properly in the current GHC head. I'm sure that it worked well at
>> least on May 7.
>> 
>> We need to narrow the range of commits, so I did:
>> 
>> % git checkout bb2795db36b36966697c228315ae20767c4a8753 % git
>> submodule update
>> 
>> But this does not checkout proper submodules. For instance, 
>> libraries/base has newer commits. And of cource, building fails.
>> 
>> Please tell us how to checkout proper submodules against a
>> specific GHC tree.
>> 
>> --Kazu

Is there a reason why some submodules are proper git repos and some
aren't? Benefits of having git repos as submodules are hopefully clear
so I'm interested why this isn't the case here.

- -- 
Mateusz K.
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