[GHC] #16153: ghc 8.6.3 fails to build on macOS Sierra, High Sierra and Mojave (10.12 to 10.14)

[GHC]

#16153: ghc 8.6.3 fails to build on macOS Sierra, High Sierra and Mojave (10.12 to
10.14)
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        Reporter:  fxcoudert         |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  GHC doesn't work  |  (amd64)
  at all                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 > Does the testsuite not support parallel build?
 The testsuite does support parallel execution. However, to enable parallel
 execution you must use the `THREADS` variable.

 For instance,
 {{{
 make test THREADS=9
 }}}

 For details see wiki:Building/RunningTests/Running.

 > It used to work without issue in previous versions, such 8.4.4.

 I'll admit I'm a bit skeptical; GHC's testsuite driver has never supported
 parallel execution using `make -j` as far as I know. Perhaps it didn't
 break as violently, but it certainly never worked.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16153#comment:5>
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