[GHC] #14972: MacOS panic on TH

[GHC]

#14972: MacOS panic on TH
-------------------------------------+-------------------------------------
        Reporter:  harpocrates       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 This is even simpler to reproduce: `ghc --interactive` doesn't work on Mac
 OS X:

 {{{
 MacBook-Pro-97:unifier-ghc ezyang$ ~/Dev/ghc/inplace/bin/ghc-stage2
 --interactive
 GHCi, version 8.5.20180327: http://www.haskell.org/ghc/  :? for help
 ghc-stage2: loadArchive: Failed reading header from
 `/Users/ezyang/Dev/ghc/libraries/integer-gmp/dist-install/build/gmp'
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 8.5.20180327 for x86_64-apple-darwin):
         loadArchive "/Users/ezyang/Dev/ghc/libraries/integer-gmp/dist-
 install/build/gmp": failed

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

 This was a 'perf' build of:

 {{{
 commit b58282a009ae67cbd4befbe062452026c82afd51 (HEAD -> master,
 origin/master, origin/HEAD)
 Author: Ben Gamari <ben at smart-cactus.org>
 Date:   Tue Mar 27 09:57:01 2018 -0400

     More format string fixes
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14972#comment:5>
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