[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:                    |
-------------------------------------+-------------------------------------

Comment (by harpocrates):

 Replying to [comment:1 mpickering]:
 > How did you build GHC? This kind of error occurs if you build with nix
 and don't use `configurePhase` and `buildPhase`.

 I just followed the instructions from the Build page. Pretty much just

 {{{
 $ ./boot
 $ ./configure --with-ghc=ghc-8.4.1
 $ make -j4 V=0
 }}}

 I've been bisecting, but it is slow progress. The problem is not present
 in `a2d03c69b782212e6c476cfc1870bae493a4ac89`. I'll report back when I hit
 a commit.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14972#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler