[GHC] #9673: aarch64 7.8.4, 7.10, 7.11: lib/ghc/bin/ghc-pkg --version does not output from subprocess

[GHC]

#9673: aarch64 7.8.4, 7.10, 7.11: lib/ghc/bin/ghc-pkg --version does not output
from subprocess
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        Reporter:  juhpetersen       |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  aarch64
 Type of failure:  Installing GHC    |               Test Case:
  failed                             |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
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Comment (by rwbarton):

 The behavior in comment:4 is really weird, I would start the investigation
 there. Maybe try `echo $(strace .../ghc-pkg --version)` and try to figure
 out why it does not write anything to stdout? Could it be because stdout
 is not connected to a terminal somehow? (That's about the only explanation
 I can think of...)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9673#comment:12>
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