GHC/As a library
For instructions on the GHC API with GHC 6.8 or older please refer to GHC/As a library (up to 6.8)
GHC's functionality can be useful for more things than just compiling Haskell programs. Important use cases are programs that analyse (and perhaps transform) Haskell code. Others include loading Haskell code dynamically in a GHCi-like manner. For this reason, a lot of GHC's features can be accessed by programs which import the ghc package.
The instructions on this page concern the API of GHC 6.10.1 and above. Please not that the GHC API is still in flux and may change quite significantly between major releases while we (the GHC team) provide new features or simplify certain aspects.
2 Getting Started
To use the GHC API you need GHC 6.10.1 or above and import the ghc package.
ghc -package ghc my_program.hs
In most cases you probably also want to use the ghc-paths package.
Most of the common functionality is provided by the GHC module, but occasionally you may have to import other modules. See the GHC's haddock documentation for a list of these modules.
FIXME: link to haddock docs
3 A Simple Example
The following little program essentially does what ghc --make does.
import GHC import GHC.Paths ( libdir ) import DynFlags ( defaultDynFlags ) main = defaultErrorHandler defaultDynFlags $ do runGhc (Just libdir) $ do dflags <- getSessionDynFlags setSessionDynFlags dflags target <- guessTarget "test_main.hs" Nothing setTarget [target] load LoadAllTargets