#326: Cabal should support Cabal-version-dependent Setup.hs ----------------------------+----------------------------------------------- Reporter: claus | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: Cabal library | Version: 1.2.3.0 Severity: normal | Keywords: Difficulty: normal | Ghcversion: 6.8.2 Platform: | ----------------------------+----------------------------------------------- The manual says about non-standard `Setup.hs`: "good luck". But there are packages that need non-standard `Setup.hs`, often just very small ones. And all of them risk breakage when Cabal changes. The first issue is to specify the dependency on a particular Cabal version (#284). The next issue is that package authors often know how to write their `Setup.hs` for different versions of Cabal, but have to pick one or the other. It would be better to have `Setup.hs` code adapt to as many Cabal versions as possible. Since version mismatch leads to compile errors, that seems to imply either - separate sources (`Setup-v1.4.hs`, `Setup-v1.5.hs`, etc.) - one source, with CPP (#if Cabal==1.4 ..) If I read [http://www.haskell.org/pipermail/cabal- devel/2008-August/003576.html Add auto-generated CPP macros for package version testing] correctly, that almost provides package version info via CPP. It would only need to provide precise versions instead of lower bounds, and for the Cabal package. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/326 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects