Cabal-syntax/src/Distribution/Types/ConfVar.hs

   1 {-# LANGUAGE DeriveDataTypeable #-}
   2 {-# LANGUAGE DeriveGeneric #-}
   3
   4 module Distribution.Types.ConfVar
   5   ( ConfVar (..)
   6   ) where
   7
   8 import Distribution.Compat.Prelude
   9 import Prelude ()
  10
  11 import Distribution.Compiler
  12 import Distribution.System
  13 import Distribution.Types.Flag
  14 import Distribution.Types.VersionRange
  15
  16 -- | A @ConfVar@ represents the variable type used.
  17 data ConfVar
  18   = OS OS
  19   | Arch Arch
  20   | PackageFlag FlagName
  21   | Impl CompilerFlavor VersionRange
  22   deriving (Eq, Show, Typeable, Data, Generic)
  23
  24 instance Binary ConfVar
  25 instance Structured ConfVar
  26
  27 instance NFData ConfVar where rnf = genericRnf