Can't compile GHC-7.8.3 from git, fails on haskell98 library

[Herbert Valerio Riedel]

Hello Gergo,

On 2014-11-02 at 14:29:06 +0100, Dr. ERDI Gergo wrote:
> On Sun, 2 Nov 2014, Dr. ERDI Gergo wrote:
>
>> On a completely clean clone, I've checked out the tag
>> ghc-7.8.3-release, ran sync-all get, boot, and configure, but the
>> build fails on haskell98. Any ideas what I could be doing wrong?
>
> I've worked around this by manually checking out the 'ghc-7.8' branch
> of various submodules until I got it to work (I think the ones I
> needed to change were dph, haskell98, haskell2010, template-haskell,
> and haddock, but I'm not sure). It seems the `ghc-7.8.3-release` tag
> is in a horrible shape in terms of reproducable building of imported
> repos. Is anyone looking into fixing this?

Starting with GHC 7.8.x, fingerprints are written into
annotated & gpg-signed release tags:

  http://git.haskell.org/ghc.git/tag/refs/tags/ghc-7.8.3-release

That way you're able to restore via the fingerprint for a given release
via:

 ./utils/fingerprint/fingerprint.py restore -f <(git show ghc-7.8.3-release | grep -F '|')

I'm just surprised I couldn't find that described anywhere in the wiki,
I was sure it was written down somewhere...

hth,
  hvr