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 <[email protected]> wrote:
> On Sat, Nov 27, 2010 at 9:41 PM, Antoine Latter <[email protected]> wrote:
>> On Sat, Nov 27, 2010 at 10:59 AM, Jinjing Wang <[email protected]> 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
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