• Joachim Breitner's avatar
    Make GHC (the library) flexible in the choice of integer library · fc2ff6dd
    Joachim Breitner authored
    Summary:
    We have more and more users of GHC as a library, for example the
    Haskell-to-WebAssembly-compiler https://github.com/tweag/asterius.
    These need to make different decisions about various aspects of
    code generation than the host compiler, and ideally GHC-the-library
    allows them to set the `DynFlags` as needed.
    
    This patch adds a new `DynFlag` that configures which `integer`
    library to use. This flag is initialized by `cIntegerLibraryType`
    (as before), and is only used in `CorePrep` to decide whether to
    use `S#` or not.
    
    The other code paths that were varying based on `cIntegerLibraryType`
    are no now longer varying: The trick is to use `integer-wired-in`
    as the `-this-unit-id` when compiling either `integer-gmp` or
    `integer-simple`.
    
    Test Plan: Validate is happy.
    
    Reviewers: hvr, bgamari
    
    Reviewed By: bgamari
    
    Subscribers: TerrorJack, adamse, simonpj, rwbarton, carter
    
    GHC Trac Issues: #13477
    
    Differential Revision: https://phabricator.haskell.org/D5079
    fc2ff6dd
ghc.mk 25.8 KB