[GHC] #7083: Reduce the likelihood of x64/x86-64 changes breaking the build on other arches

[GHC]

#7083: Reduce the likelihood of x64/x86-64 changes breaking the build on other
arches
-------------------------------+--------------------------------------------
  Reporter:  erikd             |          Owner:                  
      Type:  task              |         Status:  new             
  Priority:  normal            |      Milestone:                  
 Component:  Compiler          |        Version:  7.5             
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------
Changes (by erikd):

  * status:  closed => new
  * resolution:  wontfix =>


Comment:

 Unfortunately, with this patch or something like it, I am dealing with
 constant break on PowerPc like this:

 {{{
 compiler/nativeGen/X86/Regs.hs:61:1:
     Warning: The import of `CmmCallConv' is redundant
                except perhaps to import instances from `CmmCallConv'
              To import instances alone, use: import CmmCallConv()
 }}}

 I am all for the long term goals of fixing this, but would to make sure
 that PowerPC continues to build correctly so I can work on the other
 outstanding PowerPC related tickets.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7083#comment:6>
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