This GHC dependency on Cabal is putting a rather troubling constraint in Cabal's evolution, which in my opinion is a serious problem. When I first took a look at the dependencies between GHC and Cabal I found it a bit strange that GHC would depend on Cabal as I would expect GHC to be as low in the dependency tree as possible to avoid exactly these kinds of problems.
These GHC dependencies on Cabal are in fact small (see http://hackage.haskell.org/trac/ghc/attachment/ticket/7740/ghc-2.png for a summary) and with a little bit of refactoring it would be possible to split these dependencies into a very small shared package with minimal or no further dependencies. This would liberate Cabal to make the necessary refactoring. IMHO, the addition of these new dependencies to Cabal should go together with splitting the GHC-Cabal shared dependencies into a separate package so that there would be no additional coordination needed from then on between these two development efforts (except when dealing with this new package). On Thu, Mar 14, 2013 at 12:12 PM, Duncan Coutts <duncan.cou...@googlemail.com> wrote: > On Thu, 2013-03-14 at 16:06 +0100, Gregory Collins wrote: >> On Thu, Mar 14, 2013 at 3:53 PM, Duncan Coutts <duncan.cou...@googlemail.com >> > wrote: >> >> > Hi folks, >> > >> > I want to give you advance notice that I would like to make Cabal depend >> > on parsec. The implication is that GHC would therefore depend on parsec >> > and thus it would become a core package, rather than just a HP package. >> > So this would affect both GHC and the HP, though I hope not too much. >> >> >> +1 from me, although the amount of potential knock-on work might be >> discouraging. The current cabal-install bootstrap process (which is >> currently pretty easy and is necessary at times) will get a bunch more deps >> as a result of this change, no? > > Yes it will, but given that we do have a script it's not too bad I > think. And overall I think its worth it to have the better error > messages, performance and memory use. Do you have any idea how slow it > is to parse all the .cabal files on hackage, and how much memory that > takes? You'd be horrified :-) > > Duncan > > > _______________________________________________ > cabal-devel mailing list > cabal-devel@haskell.org > http://www.haskell.org/mailman/listinfo/cabal-devel _______________________________________________ cabal-devel mailing list cabal-devel@haskell.org http://www.haskell.org/mailman/listinfo/cabal-devel
