[GHC] #12733: Orphan hashes are not being propagated correctly

[GHC]

#12733: Orphan hashes are not being propagated correctly
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        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Driver            |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2610
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"3866481f228b28687c4021d9deb16e2138fdc008/ghc"
 3866481f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="3866481f228b28687c4021d9deb16e2138fdc008"
 Compute export hash based on ALL transitive orphan modules.

 Previously we pruned out orphan modules from external packages but this
 was wrong.  Fixes #12733 (which has more discussion.)

 Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>

 Test Plan: validate

 Reviewers: simonpj, bgamari, austin

 Reviewed By: simonpj

 Subscribers: simonpj, thomie

 Differential Revision: https://phabricator.haskell.org/D2610

 GHC Trac Issues: #12733
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12733#comment:4>
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