Sorry, should be `cabal install --flags="ghc7" package-name`. On Sun, Nov 28, 2010 at 1:59 AM, Jinjing Wang <nfjinj...@gmail.com> wrote: > Thanks Michael, > > So the user should use `cabal install --flags -ghc7 package-name` to > install the package, if I'm not mistaken? > > Will it work if the package is installed as a dependency? Will the > flag environment be passed down from the root package? > > Is there a way to detect GHC version automatically? > > : ) > > Best, > > > On Sun, Nov 28, 2010 at 1:32 AM, Michael Snoyman <mich...@snoyman.com> wrote: >> On Sat, Nov 27, 2010 at 6:59 PM, Jinjing Wang <nfjinj...@gmail.com> wrote: >>> Dear list, >>> >>> >From ghc 7.0.1 release notes: >>> >>>> The Language.Haskell.TH.Quote.QuasiQuoter type has two new fields: >>>> quoteType and quoteDec. >>> >>> Some of my code needs to be conditionally compiled to support both >>> version 6 and 7, what is the recommended way to do it? >>> >>> ref: >>> >>> * >>> http://new-www.haskell.org/ghc/docs/7.0.1/html/users_guide/release-7-0-1.html >> >> Hi Jinjing, >> >> I've done this in Yesod. I'm not sure if it's the best way, but >> basically I've added a ghc7 flag to the cabal file, and a block for >> the library that reads: >> >> if flag(ghc7) >> build-depends: base >= 4.3 && < 5 >> cpp-options: -DGHC7 >> else >> build-depends: base >= 4 && < 4.3 >> >> Then whenever I want to quasi-quote in the code, I write: >> >> #if GHC7 >> [quasiquoter| >> #else >> [$quasiquoter| >> #endif >> >> Michael >> > > > > -- > jinjing >
-- jinjing _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe