[GHC] #7790: Add dummy undefined symbols to indicate ways

[GHC]

#7790: Add dummy undefined symbols to indicate ways
---------------------------------+------------------------------------------
    Reporter:  ezyang            |       Owner:  ezyang          
        Type:  task              |      Status:  new             
    Priority:  normal            |   Milestone:  7.8.1           
   Component:  Compiler          |     Version:                  
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by igloo):

  * difficulty:  => Unknown
  * milestone:  => 7.8.1


Comment:

 Sounds good to me.

 We also put the compiler version in as a comment, in
 `nativeGen/AsmCodeGen.lhs`:
 {{{
                 -- And just because every other compiler does, lets stick
 in
                 -- an identifier directive: .ident "GHC x.y.z"
             (if platformHasIdentDirective platform
              then let compilerIdent = text "GHC" <+> text cProjectVersion
                    in text ".ident" <+> doubleQuotes compilerIdent
              else empty)
 }}}
 so it might be worth also putting the way in there, just to make the
 information easier to find.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7790#comment:1>
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