Thanks Bas for the helpful & clear advice.
While I'm not on top of it yet why some installs of 6.10.1 experience
this build
failure, but others don't, I've put together an updated .cabal file +
source dist
that I hope gets at it. It's available from
http://www.galois.com/~sof/json-0.4.1.tar.gz
I've pointed Alex at this bundle earlier, but if others that have run
into the same
problem could test using above bits and see if that fixes it, that'd be
great.
If cool, I'll upload the bits to hackage. My apologies if this is
breaking people's
cabal builds at the moment.
cheers
--sigbjorn
On 1/13/2009 11:58, Bas van Dijk wrote:
On Tue, Jan 13, 2009 at 8:47 PM, Alex Ott <[email protected]> wrote:
Hello
"SF" == Sigbjorn Finne writes:
SF> Hi, a new release of the 'json' package is now available via hackage,
SF> version 0.4.1
SF> http://hackage.haskell.org/cgi-bin/hackage-scripts/package/json
I tried to upgrade it via cabal on mac os x & linux (both use ghc 6.10.1)
and it fails with
Building json-0.4.1...
Text/JSON/Generic.hs:33:7:
Could not find module `Data.Generics':
it was found in multiple packages: base-3.0.3.0 syb
cabal: Error: some packages failed to install:
json-0.4.1 failed during the building phase. The exception was:
exit: ExitFailure 1
The standard solution for this is to add a cabal flag that controls
wether to depend on base-4 or base-3:
------------------------------------------------------
flag small_base
description: Choose the new smaller, split-up base package.
Library
if flag(small_base)
Build-Depends: base == 4.*, syb
CPP-Options: -DBASE_4
else
Build-Depends: base == 3.*
------------------------------------------------------
And use some CPP in your modules like this:
------------------------------------------------------
{-# LANGUAGE CPP #-}
#ifdef BASE_4
import Data.Data (Data)
#else
import Data.Generics (Data)
#endif
------------------------------------------------------
See for example how I do it in http://code.haskell.org/Stream
regards,
Bas
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