RFC: include a cabal-install executable in future GHC releases

[Henning Thielemann]

Am 22.01.2014 13:22, schrieb Roman Cheplyaka:
> * Herbert Valerio Riedel <hvr at gnu.org> [2014-01-22 12:55:53+0100]
>>
>> When I look at http://hackage.haskell.org/package/haddock, there are
>> multiple versions, 2.12.0 and the 4 versions of 2.13.*, which are all
>> declared to work with ghc == 7.6.*, that is, 5 haddock versions
>> compatible with 3 released versions of GHC 7.6. So while it may be bound
>> to a major version of the GHC API, haddock can obviously have more
>> releases than GHC has releases (otherwise it could just carry GHC's
>> version), and can therefore be updated.
>
> Henning could be more specific in his claim that "haddock is bound to
> the specific GHC version".

What I mean is: The Haddock that comes with GHC has a name like 
haddock-ghc-7.6.3 and when I (cabal-)install a package with a certain 
GHC versions then the haddock-ghc according to the ghc version is 
chosen. If I install a package for different GHC versions then I get a 
warning that the global haddock database version does not match the one 
of the GHC version used for the particular package. Now, I become 
uncertain whether this is an argument pro or contra including Haddock in 
the binary GHC tarball.