[GHC] #9673: aarch64 7.8.4, 7.10, 7.11: lib/ghc/bin/ghc-pkg --version does not output from subprocess (was: ghc 7.8.4 and 7.10 fail to build on aarch64)

[GHC]

#9673: aarch64 7.8.4, 7.10, 7.11: lib/ghc/bin/ghc-pkg --version does not output
from subprocess
-------------------------------------+-------------------------------------
        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:                    |
-------------------------------------+-------------------------------------
Changes (by juhpetersen):

 * priority:  normal => high
 * failure:  None/Unknown => Installing GHC failed


Comment:

 Also happens with ghc-7.11.20150316 (yesterday's head of git master).

 Note:

 {{{
 $
 rpmbuild/BUILDROOT/ghc-7.11.20150316-0.1.fc21.aarch64/usr/lib64/ghc-7.11.20150316/bin
 /ghc-pkg --version
 GHC package manager version 7.11.20150316
 $
 }}}

 vs

 {{{
 $ echo
 $(rpmbuild/BUILDROOT/ghc-7.11.20150316-0.1.fc21.aarch64/usr/lib64/ghc-7.11.20150316/bin
 /ghc-pkg --version)

 $
 }}}

 !!

 So somehow subprocess IO seems to be affected.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9673#comment:4>
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