[GHC] #11744: Latest Xcode update violates POSIX compliance of `nm -P`

[GHC]

#11744: Latest Xcode update violates POSIX compliance of `nm -P`
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        Reporter:  hvr           |                Owner:
            Type:  bug           |               Status:  new
        Priority:  highest       |            Milestone:
       Component:  Build System  |              Version:
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):  phab:D2113
       Wiki Page:                |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"10d808c59307c5c0b1cb40a9ce0eb6e3efc068c9/ghc"
 10d808c5/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="10d808c59307c5c0b1cb40a9ce0eb6e3efc068c9"
 relnotes: Add note about #11744 and workaround

 Test Plan: Read it

 Reviewers: hvr, austin

 Subscribers: carter, thomie

 Differential Revision: https://phabricator.haskell.org/D2120

 GHC Trac Issues: #11744
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11744#comment:15>
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