[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:                    |
-------------------------------------+-------------------------------------

Comment (by hvr):

 Replying to [comment:37 recursion-ninja]:
 > I was having "show-stopping" graphics driver issues on Ubuntu 16.04 that
 were only resolved by the 4.15.* version of the Linux kernel which was not
 and would not be supported (to the best of my knowledge) by Ubuntu 16.04.
 My upgrade to Ubuntu 18.04 was more or less "forced" to get a kernel
 version compatible with my machine.

 I've been in a similiar situation, and so have a lot others; *but* that's
 why Ubuntu some time ago introduced

 https://wiki.ubuntu.com/Kernel/LTSEnablementStack

 in order to help users who want to avoid having to upgrade away from an
 LTS release for the sake of a kernel upgrade. I'm happily running a

 {{{
 ii  linux-image-4.15.0-20-generic                 4.15.0-20.21~16.04.1
 amd64        Signed kernel image generic
 }}}

 kernel which iirc I had gotten installed before Ubuntu 18.04 Bionic was
 even released.

 > This might be true. However, I did encountered this `-g` related defect
 through "normal," non-`stack` usage of `ghc`. There's a chance that my
 situation is an anomaly, but there's also a chance the defect might have a
 larger impact than estimated.

 Since you're on an Ubuntu system and you seem to be experienced enough to
 consider installing a bleedinge edge GCC toolchain; but then why aren't
 you simply using a GHC binary distribution like the ones I offer on
 https://launchpad.net/~hvr/+archive/ubuntu/ghc which are specifically
 configured and built for Ubuntu and designed to protect against this very
 kind of compatibility issues that inevitably creep up over time?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15068#comment:38>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler