[GHC] #15068: Small number of test case failures on Ubuntu Bionic (GCC 7.3)

[GHC]

#15068: Small number of test case failures on Ubuntu Bionic (GCC 7.3)
-------------------------------------+-------------------------------------
        Reporter:  jrp               |                Owner:  (none)
            Type:  bug               |               Status:  merge
        Priority:  highest           |            Milestone:  8.4.3
       Component:  Compiler          |              Version:  8.4.1
  (CodeGen)                          |
      Resolution:  fixed             |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  Incorrect result  |            Test Case:  T13658
  at runtime                         |  T14779a T14779b T14868 debug
                                     |  parsing001
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4654
       Wiki Page:                    |
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Comment (by hvr):

 It's worth pointing out that this would mostly be experienced with Stack's
 somewhat questionable defaults. It should be rather easy to fix this on
 Stack's side by detecting system configurations which are known to be
 incompatible and avoid passing `-g` to GHC by default. For those that are
 blocked on this, I'd recommend either giving `cabal new-build` a try or
 using Stack w/ the GHC 8.4.2 (`ghc-8.4.2 8.4.2-8~18.04`) or GHC 8.2.2
 (`ghc-8.2.2 8.2.2-4~18.04`) packages for Ubuntu 18.04 LTS from my Ubuntu
 PPA which don't suffer from this issue.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15068#comment:25>
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