[GHC] #14862: Switching to Cabal 2.2 makes ghc unusable

[GHC]

#14862: Switching to Cabal 2.2 makes ghc unusable
-------------------------------------+-------------------------------------
           Reporter:  alpmestan      |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:
          Component:  None           |           Version:  8.4.1-alpha3
           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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 When bumping Cabal to 2.2 as done [https://phabricator.haskell.org/D4453
 here], we end up with a stage 1 GHC that seemingly cannot build a non-
 segfaulting program.

 For instance, if one builds the following trivial program with a stage 1
 built from the ghc-8.4 branch + the patch above...

 {{{#!hs
 import System.Exit
 main = exitSuccess
 }}}

 Then...

 {{{#!sh
 $ ./foo
 Segmentation fault
 }}}

 So of course, when we proceed and build stage 2, and then build things
 with stage 2, all the stage2 commands crash.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14862>
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