I'm getting similar error on my 32-bit Windows 10:
 
GHCi, version 7.11.20151114: http://www.haskell.org/ghc/  :? for help
ghc.exe: C:\ghc-8.0_git\usr\local\lib\ghc-prim-0.5.0.0\HSghc-prim-0.5.0.0.o: Not x86 PEi386
ghc.exe: panic! (the 'impossible' happened)
(GHC version 7.11.20151114 for i386-unknown-mingw32):
      loadObj "C:\\ghc-8.0_git\\usr\\local\\lib\\ghc-prim-0.5.0.0\\HSghc-prim-0.5.0.0.o": failed
 
Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 
And running `file lib\ghc-prim-0.5.0.0\HSghc-prim-0.5.0.0.o` I get:
 
lib\ghc-prim-0.5.0.0\HSghc-prim-0.5.0.0.o: PE Unknown PE signature 0x342f Intel 80386 (stripped to external PDB), for MS Windows
 
 
-----Original Message-----
From: Simon Peyton Jones
Sent: Wednesday, November 18, 2015 12:25 AM
To: David Macek ; ghc-devs@haskell.org
Subject: RE: Window build broken
 
It says this:
 
bash$ file libraries/ghc-prim/dist-install/build/HSghc-prim-0.5.0.0.o
libraries/ghc-prim/dist-install/build/HSghc-prim-0.5.0.0.o: PE Unknown PE signature 0x742e x86-64 (stripped to external PDB), for MS Windows
 
| -----Original Message-----
| From: David Macek [mailto:david.macek.0@gmail.com]
| Sent: 17 November 2015 22:45
| To: Simon Peyton Jones <simonpj@microsoft.com>; ghc-devs@haskell.org
| Subject: Re: Window build broken
|
| On 17. 11. 2015 23:31, Simon Peyton Jones wrote:
| > Sigh.  My Windows build is broken.  See below.  Any ideas?  The stage2
| complier in non-interactive mode works ok. It’s just ghci fails.  What does
| “Not x86_64 PEi386” mean?  What can I do to fix?
|
| Maybe it's obvious and you already checked, but could it be that the object
| file is for a different architecture? What does `file` say about it?
|
| --
| David Macek
 
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