[GHC] #7373: When building GHC: Failed to load interface for `GHC.Fingerprint'

[GHC]

#7373: When building GHC: Failed to load interface for `GHC.Fingerprint'
-------------------------------+--------------------------------------------
  Reporter:  igloo             |          Owner:  igloo           
      Type:  bug               |         Status:  closed          
  Priority:  normal            |      Milestone:  7.8.1           
 Component:  libraries/base    |        Version:  7.6.1           
Resolution:  wontfix           |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------

Comment(by simonpj):

 Replying to [comment:3 igloo]:
 > OK, it looks like this goes wrong because of the way we interleave the
 building of packages when building GHC. GHC assumes that if we're building
 one package, then packages that it depends on have already been built and
 are complete. Therefore, even if a module in the other package has a `.hs-
 boot` file, the real `.hs` file will also have been compiled and there
 will be a full `.hi` file.
 >
 > That seems like a reasonable assumption to make, and it doesn't look
 like anything actually fails as a result of this, so I don't think we need
 to take any action.

 Ian I'm far from certain that your diagnosis here is correct, and indeed I
 don't really understand it.  Yes, the assumption you describe seems a
 reasonable one. Does it not hold?  Does not-holding have consequences of
 missing unfoldings?  GHC is, I believe, happy to accept either a .hi file
 or a .hi-boot file.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7373#comment:4>
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