[GHC] #13113: Runtime linker errors with CSFML on Windows

13 Jan 2017

      #13113: Runtime linker errors with CSFML on Windows
-------------------------------------+-------------------------------------
           Reporter:  RyanGlScott    |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Runtime        |           Version:  8.0.2
  System (Linker)                    |
           Keywords:                 |  Operating System:  Windows
       Architecture:                 |   Type of failure:  GHCi crash
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Another day, another runtime linker bug on Windows. This time, it's from
 the CSFML library (written in C++). I observed this when trying to load
 the [http://hackage.haskell.org/package/SFML SFML] Haskell library in
 GHCi.

 To install CSFML in MSYS2:

 {{{
 pacman -S mingw-w64-x86_64-csfml
 }}}

 Here's the Haskell code I'm using:

 {{{#!hs
 module Main (main) where

 import Foreign.Ptr

 newtype CircleShape = CircleShape (Ptr CircleShape)
   deriving Show

 foreign import ccall unsafe "sfCircleShape_create"
   sfCircleShape_create :: IO CircleShape
 foreign import ccall unsafe "sfCircleShape_copy"
   sfCircleShape_copy :: CircleShape -> IO CircleShape

 main :: IO ()
 main = do
   putStrLn "----------------------"
   cs1 <- sfCircleShape_create
   print cs1
   cs2 <- sfCircleShape_copy cs1
   print cs2
   putStrLn "----------------------"
 }}}

 Compiling it with `ghc -lcsfml-graphics SFML.hs` on GHC 8.0.2 and HEAD
 seems to work fine. But if you run it in GHCi, it breaks.

 With GHCi 8.0.2:

 {{{
 $ ghci -lcsfml-graphics SFML.hs
 GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
 ghc.exe: addDLL: csfml-graphics-2.dll (Win32 error 127): The specified
 procedure could not be found.
 ghc.exe: Could not load `csfml-graphics-2.dll'. Reason: addDLL: could not
 load DLL

 Loaded GHCi configuration from
 C:\Users\RyanGlScott\AppData\Roaming\ghc\ghci.conf
 [1 of 1] Compiling Main             ( SFML.hs, interpreted )
 Ok, modules loaded: Main.
...
main
ByteCodeLink: can't find label
 During interactive linking, GHCi couldn't find the following symbol:
   sfCircleShape_create
 This may be due to you not asking GHCi to load extra object files,
 archives or DLLs needed by your current session.  Restart GHCi, specifying
 the missing library using the -L/path/to/object/dir and -lmissinglibname
 flags, or simply by naming the relevant files on the GHCi command line.
 Alternatively, this link failure might indicate a bug in GHCi.
 If you suspect the latter, please send a bug report to:
   glasgow-haskell-bugs@haskell.org
 }}}

 With GHC HEAD:

 {{{
 $ ..\..\..\Software\ghc\inplace\bin\ghci -lcsfml-graphics SFML.hs
 GHCi, version 8.1.20170108: http://www.haskell.org/ghc/  :? for help
 ghc-stage2.exe: addDLL: csfml-graphics-2.dll (Win32 error 127): The
 specified procedure could not be found.
 ghc-stage2.exe: Could not load `csfml-graphics-2.dll'. Reason: addDLL:
 could not load DLL

 Loaded GHCi configuration from
 C:\Users\RyanGlScott\AppData\Roaming\ghc\ghci.conf
 Ok, modules loaded: Main (SFML.o).
...
main
 ghc-stage2.exe: C:\Users\RyanGlScott\Documents\Hacking\Haskell\SFML.o:
 unknown symbol `sfCircleShape_create'
 }}}
I also get the same error with Phab:D2941 (#13082) applied.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13113>
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