[Hackage] #566: Don't try and resolve dependencies for packages that are not buildable

[Hackage]

#566: Don't try and resolve dependencies for packages that are not buildable
----------------------------------+-----------------------------------------
  Reporter:  batterseapower       |        Owner:         
      Type:  defect               |       Status:  new    
  Priority:  normal               |    Milestone:         
 Component:  Cabal library        |      Version:  1.6.0.1
  Severity:  normal               |     Keywords:         
Difficulty:  very easy (<1 hour)  |   Ghcversion:         
  Platform:                       |  
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 I had a component like this:

 {{{
 Executable edit-distance-benchmark
         Main-Is:                Text/EditDistance/Benchmark.hs

         if flag(splitBase)
                 Build-Depends:  base >= 3 && < 5, array >= 0.1, random >=
 1.0, old-time >= 1.0, process >= 1.0,
                                 parallel >= 1.0, unix >= 2.3
         else
                 Build-Depends:  base < 3,
                                 parallel >= 1.0, unix >= 2.3

         if !flag(benchmark)
                 Buildable:      False

         Ghc-Options:            -O2 -fvia-C -Wall
 }}}

 However, I've only just found out that this meant that you couldn't
 install any parts of my package on Windows, because Cabal tried to resolve
 the "unix" dependency even if "benchmark" was False (the default)!

 I've solved this like so:

 {{{
 Executable edit-distance-benchmark
         Main-Is:                Text/EditDistance/Benchmark.hs

         if !flag(benchmark)
                 Buildable:      False
         else
                 if flag(splitBase)
                         Build-Depends:  base >= 3 && < 5, array >= 0.1,
 random >= 1.0, old-time >= 1.0, process >= 1.0,
                                         parallel >= 1.0, unix >= 2.3
                 else
                         Build-Depends:  base < 3,
                                         parallel >= 1.0, unix >= 2.3

         Ghc-Options:            -O2 -fvia-C -Wall
 }}}

 But really Cabal should not need to resolve dependencies for things that
 are not buildable.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/566>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects