[GHC] #8608: internal error: ARR_WORDS object entered!

[GHC]

#8608: internal error: ARR_WORDS object entered!
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        Reporter:  Rothiph        |            Owner:
            Type:  bug            |           Status:  closed
        Priority:  normal         |        Milestone:
       Component:  Compiler       |          Version:  7.6.3
      Resolution:  invalid        |         Keywords:
Operating System:  Windows        |     Architecture:  x86
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by Rothiph):

 I think I understand what was going on, and will explain in case anyone
 else has trouble calling into .dll files. Note that some of this may be
 inaccurate.

 The Win32 DLL I'm trying to load is dhcpsapi.dll. I can access functions
 using run-time dynamic loading (by calling LoadLibrary), but if I attempt
 to call them using load-time dynamic loading an access violation is
 triggered.

 GHC on windows relies on mingw. When you specify a dll to load using the
 "extra-libraries" option in the cabal file, the standard Windows search
 mechanism is not used. Each common system dll has a corresponding .a file
 under "C:\Program Files (x86)\Haskell Platform\2013.2.0.0\mingw\lib".

 My problem was that mingw does not include an .a file for dhcpsapi. Trying
 to load it natively worked in the sense that the project was able to
 compile and link, but something went wrong at runtime. I suspect this has
 something to do with the fact that dhcpsapi.dll depends on other system
 dlls which mingw has already linked in.

 My previous computer must have already had mingw-w64 installed, which does
 include dhcpsapi.a. Being earlier in my PATH, this variant of mingw was
 being used by ghc.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8608#comment:3>
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