On 2008.06.14 08:56:34 +0100, Duncan Coutts <[EMAIL PROTECTED]> scribbled 1.3K characters: > > On Fri, 2008-06-13 at 22:10 -0400, Gwern Branwen wrote: > > > I think this may be Cabal's fault anyway. The yi.cabal includes the line: > > build-tools: alex >= 2.0.1 && < 3 > > > > in the 'executable yi' section, right after the build-depends, so Yi > > is being straightforward and upfront about its needs. Now, Cabal is > > obviously checking that the build-depends is satisfied first, but why > > isn't it checking that alex is available when it has the information > > it needs to check, presumably anything in build-tools is *required*, > > and the field name suggests that it would be checked? > > Yes, you're right. This is the ticket you filed last time: > > http://hackage.haskell.org/trac/hackage/ticket/227 > > and my comment: > > One problem is that not all build-tools correspond to haskell > packages. Some do some don't. We have a hard coded list of them > at the moment (which can be extended in Setup.hs files) so we > could extend that with what haskell package if any the tools > correspond to. Any better suggestions to make it a tad more > generic? > > If anyone has a godd suggestion I'm happy to hear it. Otherwise we can > just add a Maybe Dependency to the Program type to indicate that some > build tools have a corresponding haskell package. > > Duncan
Well, one work-around would be to have everyone do a library/executable split for their tools. This exposes a library module and allows it to be listed in build-depends:. (This is something of a hack, but I think it has some nice effects - it's polite to allow people access to the core logic so they can try to improve on your version, and it encourages you to make the executable more of a wrapper around a library.) -- gwern benelux EIP Red CISD LUK on botux Bletchley 2E781 Connections
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