Can't allocate thunk for wcslen

Hello,

I'm trying to use the tinyfiledialogs library through the FFI, I've put the .h and .c files in a folder called "foreign" in the root of my project and configured cabal so it looks in this folder. The code for calling this function is as:

{-# LANGUAGE ForeignFunctionInterface #-}
module Escri where

import Foreign.C.String

foreign import ccall "tinyfiledialogs.h tinyfd_messageBox" c_messageBox
    :: CString -> CString -> CString -> CString -> Int -> IO Int

messageBox :: String -> String -> String -> String -> Int -> IO Bool
messageBox title message dialogType iconType defaultButton = do
    cTitle <- newCString title
    cMessage <- newCString message
    cDialogType <- newCString dialogType
    cIconType <- newCString iconType
    result <- c_messageBox cTitle cMessage cDialogType cIconType defaultButton
    return (result == 1)

When trying to run GHCi for this project, I get the following error

Configuring GHCi with the following packages: escri
GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
ghc.EXE: internal error: Can't allocate thunk for wcslen
    (GHC version 8.0.2 for x86_64_unknown_mingw32)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

This only happens in Windows. In OSX I just get a linker error.

If I try to make a call with stdcall, it tells:

C:\Users\Nick\Development\escri\src\Escri.hs:6:1: warning: [-Wunsupported-calling-conventions]
    * the 'stdcall' calling convention is unsupported on this platform,
      treating as ccall
    * When checking declaration:
        foreign import stdcall safe "static tinyfiledialogs.h tinyfd_messageBox" c_messageBox
          :: CString -> CString -> CString -> CString -> Int -> IO Int

Which is strange, because I'm on Windows.

Thanks in advance.

Trac metadata

Trac field	Value
Version	8.0.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (FFI)
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