[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:  normal        |            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):
       Wiki Page:                |
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Comment (by chak):

 After some talk on the mailing list, there is a simple enough workaround.
 Just use `nm-classic`. Specifically, check whether

   `xcode-select -p`/Toolchains/XcodeDefault.xctoolchain/usr/bin/nm-classic

 or

   `xcode-select -p`/usr/bin/nm-classic

 exists. If yes, use that instead of ’nm’; otherwise, use ’nm’ as usual.
 (You need to check for both, because the former is what comes with Xcode
 and the latter is what comes with the standalone command line tool
 package.)

 Printing decimal numbers instead of hex with the '-P' option still looks
 like an oversight, but I think that would need to be taken up with the
 LLVM maintainers, instead of trying to route through Apple (who are
 probably just going to point to 'nm-classic' anyway).

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11744#comment:10>
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