[GHC] #7780: GHC HEAD dll fails to build on Windows

[GHC]

#7780: GHC HEAD dll fails to build on Windows
---------------------------------+------------------------------------------
    Reporter:  rassilon          |       Owner:  igloo              
        Type:  bug               |      Status:  patch              
    Priority:  normal            |   Milestone:                     
   Component:  Build System      |     Version:                     
    Keywords:                    |          Os:  Windows            
Architecture:  Unknown/Multiple  |     Failure:  Building GHC failed
  Difficulty:  Unknown           |    Testcase:                     
   Blockedby:                    |    Blocking:                     
     Related:                    |  
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Comment(by igloo):

 Hmm, I suspect that this worked for me because my optimisation flags meant
 that the cross-module reference got inlined.

 I've been looking at making an automated check for this, but discovered
 that all but these 14 modules:
 {{{
 CmmRewriteAssignments
 Debugger
 DriverMkDepend
 DriverPipeline
 GHC
 GhcMake
 GhcPlugins
 LexCore
 ParserCore
 ParserCoreUtils
 PprTyThing
 RegAlloc.Graph.ArchBase
 RegAlloc.Graph.ArchX86
 RegAlloc.Graph.Coalesce
 }}}
 are in the module import loop in the ghc package.

 I've attached the graph and the script to make it. Red blobs are boot
 modules, and blue blobs are normal modules which have a boot counterpart.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7780#comment:3>
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