#13483: Can't allocate thunk for wcslen -------------------------------------+------------------------------------- Reporter: NickSeagull | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 (FFI) | Keywords: | Operating System: Windows Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Hello, I'm trying to use the [https://sourceforge.net/projects/tinyfiledialogs 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: {{{#!hs {-# 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. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13483 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler