On Wed, Nov 29, 2006 at 03:32:52AM +0000, Duncan Coutts wrote:
On Tue, 2006-11-28 at 18:28 +0000, Ross Paterson wrote:
In that sense, there's only one value (Custom), but defaultMain is common, and a reasonable number of packages use
main = defaultMainWithHooks defaultUserHooks
which (bizarrely) is not the same as defaultMainWithHooks defaultUserHooks, though it really should be.
Fair enough, but for this discussion the point is that whatever they're called, there are two of them (three if you count Make).
Oh you mean that since people would want to be backwards compatible that they would include a simple Setup.hs and then we loose the advantage of not having to compile Setup.hs and thus having an extra field to say to use simple even if there is a Setup.hs present is a benefit?
Yes, it is a benefit but it seems rather marginal to me. Remember that we can't always avoid building a trivial Setup.hs anyway, since in the case that cabal-setup was built with Cabal-x.y and the .cabal requests cabal version x.y+1 then cabal-setup needs to build Setup.hs with the later version of the Cabal lib and use that.
Yes we do, and even if Setup.hs wasn't present. But this will be rare, especially if one keeps cabal-setup up to date. The idea is to get the benefit most of the time, though not all.