ghc-9.2.1: The GHC API
Safe HaskellSafe-Inferred



Module for detecting if recompilation is required



checkOldIface :: HscEnv -> ModSummary -> SourceModified -> Maybe ModIface -> IO (RecompileRequired, Maybe ModIface) Source #

Top level function to check if the version of an old interface file is equivalent to the current source file the user asked us to compile. If the same, we can avoid recompilation. We return a tuple where the first element is a bool saying if we should recompile the object file and the second is maybe the interface file, where Nothing means to rebuild the interface file and not use the existing one.

data RecompileRequired Source #



everything is up to date, recompilation is not required


The .hs file has been touched, or the .o/.hi file does not exist

RecompBecause String

The .o/.hi files are up to date, but something else has changed to force recompilation; the String says what (one-line summary)

addFingerprints :: HscEnv -> PartialModIface -> IO ModIface Source #

Add fingerprints for top-level declarations to a ModIface_.

See Note [Fingerprinting IfaceDecls]