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module Stage (Stage (..), stageString) where
import Development.Shake.Classes
import GHC.Generics
-- | A stage refers to a certain compiler in GHC's build process.
--
-- * Stage 0 is built with the bootstrapping compiler, i.e. the one already
-- installed on the user's system. The compiler that is produced during
-- stage 0 is called /stage 1 compiler/.
--
-- * Stage 1 is built using the stage 1 compiler and all GHC sources. The result
-- is called /stage 2 compiler/ and it has all features of the new GHC.
--
-- * Stage 2 is built using the stage 2 compiler. The result is a compiler
-- fully "built by itself", commonly referred to as /bootstrapping/.
--
-- * Stage 3 is built as a self test. The resulting compiler should have
-- the same object code as the one built in stage 2, which is a good test
-- for the compiler. Since it serves no other purpose than that, the stage 3
-- build is usually omitted in the build process.
data Stage = Stage0 | Stage1 | Stage2 | Stage3
deriving (Show, Eq, Ord, Enum, Generic, Bounded)
instance Binary Stage
instance Hashable Stage
instance NFData Stage
-- | Prettyprint a 'Stage'.
stageString :: Stage -> String
stageString stage = "stage" ++ show (fromEnum stage)
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