[GHC] #10244: "memory barriers unimplemented on this architecture" on ARM pre-ARMv7

[GHC]

#10244: "memory barriers unimplemented on this architecture" on ARM pre-ARMv7
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        Reporter:  rwbarton          |                   Owner:  simonmar
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.2
       Component:  Runtime System    |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:  arm
 Type of failure:  Building GHC      |               Test Case:
  failed                             |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
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Comment (by slyfox):

 Can you try this patch on a real host to see if it's the only omission?

 If it's fine I'll make a proper Phab DR.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10244#comment:3>
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