-
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