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
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