[GHC] #15348: Enable two-step allocator on FreeBSD

[GHC]

#15348: Enable two-step allocator on FreeBSD
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  feature request   |               Status:  merge
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  FreeBSD           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4939
       Wiki Page:                    |
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Comment (by bgamari):

 vdukhovni, the patch has been merged.

 That being said, I'm a bit confused; I have tried building it under a
 FreeBSD 11 VM but it doesn't appear that `MAP_GUARD` is defined. I checked
 in both the `mmap(2)` manpage as well as `<sys/mman.h>` and found no
 mention of `MAP_GUARD`. What am I missing?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15348#comment:18>
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