[GHC] #12695: Build failure due to MAP_NORESERVE being removed in FreeBSD 11.x and later

[GHC]

#12695: Build failure due to MAP_NORESERVE being removed in FreeBSD 11.x and later
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        Reporter:  Ashish SHUKLA     |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  FreeBSD           |         Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Erik de Castro Lopo):

 You can get around this by configuring GHC with `--disable-large-address-
 space` and rebuilding it. This turns off the large address space features
 to give the same behavior as versions of GHC before 8.0.

 It would also be interesting to test whether `#defined MAP_NO_RESERVE 0`
 at the top of `rts/posix/OSMem.c` and configuring with `--enable-large-
 address-space` results in a working compiler.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12695#comment:1>
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