[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:  8.6.1
       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 svenpanne):

 I think that none of the suggestion so far is very helpful in the long
 run, the raw numbers (e.g. DistroWatch, State of Haskell Survey) indicate
 that this problem is a show stopper for 8.4.2 and its presence alone is a
 reason for an 8.4.3 release: Stack is by far the most popular way to
 install GHC, stack is far more popular as a build tool than cabal, and
 Ubuntu is ranking among the top 3 (or 4, depending on the survey) Linux
 distros, with 18.04 even being an LTS release. Put another way: Installing
 and using GHC in one of the most probable ways according to surveys will
 lead to a fragile/broken installation.

 Installing a GHC by hand or changing the default GCC (which will
 definitely lead to problems later and undermines the whole idea of an LTS
 release) is OK as a stopgap measure, but not a real solution until August.
 I am sure everyone on this list is able to work around the problems, but I
 worry more about the average/wannabe Haskell user. Would it really be that
 hard to release an 8.4.3 with just the single fix above cherry-picked?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15068#comment:27>
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