Hi Michael, you are absolutely correct, cabal did set the flags automatically.
To sum up, here's what needs to be done: * add `flag ghc7` as a field in cabal * add: if flag(ghc7) build-depends: base >= 4.3 && < 5 cpp-options: -DGHC7 else build-depends: base >= 4 && < 4.3 in library field in cabal * add `{-# LANGUAGE CPP #-}` in source file * add #if GHC7 x #else y #endif Hi Antonine, I don't know how to not set those fields in the constructor.. as a QQ noob, I'm just hacking on some legacy code. This code doesn't compile in GHC7, so I have to do this trick. * https://github.com/nfjinjing/mps/blob/master/src/MPS/TH.hs Best, On Sun, Nov 28, 2010 at 3:48 AM, Michael Snoyman <mich...@snoyman.com> wrote: > On Sat, Nov 27, 2010 at 9:41 PM, Antoine Latter <aslat...@gmail.com> wrote: >> On Sat, Nov 27, 2010 at 10:59 AM, 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 >> >> Can you just not set those fields? Then the code should work as-is for >> both versions. You'll get warnings for GHC 7, I think. > > Sorry Jinjing, I didn't read your original email carefully enough. > Antoine is absolutely correct, this is the better way to deal with > defining a quasiquoter. My suggestion is only necessary if you want to > *use* a quasiquoter. > > Michael > -- jinjing _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe