#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 | Resolution: Keywords: | Difficulty: normal Ghcversion: 6.8.2 | Platform: ----------------------------+----------------------------------------------- Comment (by claus): Replying to [comment:1 duncan]:
I'm not sure I understand why exact versions are needed and why testing lower bounds is not enough. Testing multi-component versions in CPP macro language is not very easy.
In this case, there is only one component to version-test: Cabal, as implicitly available in `Setup.hs` code. Exact versions are needed because later versions of Cabal are highly likely to break the code. A small example package with that issue is `ghc-paths`, I think. One version works with ghc head's Cabal (1.5?), another version works with hackage's Cabal (1.4?). So there is code that could be made to work with both, if Cabal provided its version as a CPP macro. But just as the 1.4 version doesn't work with 1.5, so I wouldn't bet on the 1.5 version working with 1.7. Hence the need for exact versions. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/326#comment:2 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects