[GHC] #14381: Consider making ghc-pkg fill in abi-depends based on depends

[GHC]

#14381: Consider making ghc-pkg fill in abi-depends based on depends
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        Reporter:  ezyang            |                Owner:  thoughtpolice
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.2
       Component:  ghc-pkg           |              Version:  8.2.1
      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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Changes (by thoughtpolice):

 * owner:  (none) => thoughtpolice
 * milestone:   => 8.2.2


Comment:

 This issue is causing us a large amount of pain at work, and we're
 currently blocked on a major upgrade to GHC 8.2.1 because of it. So I'm
 going to be taking a look at fixing this later this week (at least "Part
 1" and "Part 2" of the above proposal).

 For our case, we're using Nix to control and keep everything working,
 including GHC -- so we can limp by with approaches that aren't fully
 upstream-worthy for now, it's easy enough to apply a temporary patch.
 (I'll of course see it through until it lands in HEAD, just a fore-warning
 on immediate time constraints.)

 Ben, I'm tentatively marking this as slated for 8.2.2, although admittedly
 I don't know what its current schedule looks like. If it doesn't make it
 this isn't world-ending for us, but I imagine it would make several people
 happy anyway. Feel free to push it out if needed.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14381#comment:1>
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