A preprocessor that helps with writing Haskell bindings to C code

Latest on Hackage:0.68.2

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BSD3 licensed by Marcin Kowalczyk
Maintained by ghc-devs@haskell.org

The hsc2hs program can be used to automate some parts of the process of writing Haskell bindings to C code. It reads an almost-Haskell source file with embedded special constructs, and outputs a real Haskell file with these constructs processed, based on information taken from some C headers. The extra constructs provide Haskell counterparts of C types, values of C constants, including sizes of C types, and access to fields of C structs.

For more details, see the hsc2hs section in the GHC User's Guide.



  • Support GHC 8.2.1

  • Make hsc_alignment macro work in clang (D3346)

  • Track column numbers to improve GHC's caret diagnostic display (#13388)


  • Fix type signature of generated main test function to avoid C compiler warnings about unused argc/argv function parameters during feature testing.

  • Double-escape paths used to build call to hsc_line (#12504)

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