[GHC] #7628: Improve error message when mixing 32bit and 64bit images

[GHC]

#7628: Improve error message when mixing 32bit and 64bit images
----------------------------+-----------------------------------------------
Reporter:  morabbin         |          Owner:                  
    Type:  feature request  |         Status:  new             
Priority:  normal           |      Component:  Compiler        
 Version:  7.6.1            |       Keywords:                  
      Os:  MacOS X          |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown     |      Blockedby:                  
Blocking:                   |        Related:                  
----------------------------+-----------------------------------------------
 Since we know when the user has mixed 32 and 64 bit images, let's say so
 in the error message. Before:
 {{{
 Loading object (static) dist/build/HOC_cbits.o ... ghc:
 dist/build/HOC_cbits.o: Bad magic. Expected: feedfacf, got: feedface.

 ghc: panic! (the 'impossible' happened)
   (GHC version 7.6.1 for x86_64-apple-darwin):
         loadObj "dist/build/HOC_cbits.o": failed

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}
 After:
 {{{
 Loading object (static) dist/build/HOC_cbits.o ... ghc-stage2: Could not
 load image dist/build/HOC_cbits.o: bad magic!
   Expected feedfacf (64bit), got feedface (32bit).

 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 7.7.20130124 for x86_64-apple-darwin):
         loadObj "dist/build/HOC_cbits.o": failed
 }}}
 Patch to come.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7628>
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