[GHC] #12078: ghc-boot-th package reveals issue with build system's treatment of transitive dependencies

[GHC]

#12078: ghc-boot-th package reveals issue with build system's treatment of
transitive dependencies
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The `ghc-boot-th` introduced in the resolution of #12052 seems to have
 uncovered a bug in the build system's treatment of transitive
 dependencies. Namely, it seems to be possible for the build system to
 attempt to link `ghc-pkg` before `libghc-boot-th` has been produced. This
 is odd since `ghc-pkg` has a dependency on `ghc-boot`, which in turn has a
 dependency on `ghc-boot-th`.

 In the interest of moving the 8.0.1 release along I'm going to work around
 this for the time being by adding

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12078>
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