[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
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by bgamari:

@@ -9,1 +9,2 @@
- this for the time being by adding
+ this for the time being by adding transitive dependencies to the rule in
+ `rules/build-prog.mk` which builds programs (including `ghc-pkg`).

New description:

 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 transitive dependencies to the rule in
 `rules/build-prog.mk` which builds programs (including `ghc-pkg`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12078#comment:1>
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