MacOS panic on TH

I recently did a clean build of master (affdea82) and, while everything successfully finished, I'm getting panics every time I try to use this GHC for something that involves TH.

For example:

{-# language TemplateHaskell #-}

pure []
main = pure []

Crashes with

$ ./inplace/bin/ghc-stage2 th.hs
[1 of 1] Compiling Main             ( th.hs, th.o )
ghc-stage2: loadArchive: Failed reading header from `/Users/atheriault/Documents/code/ghc/libraries/integer-gmp/dist-install/build/gmp'
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 8.5.20180325 for x86_64-apple-darwin):
        loadArchive "/Users/atheriault/Documents/code/ghc/libraries/integer-gmp/dist-install/build/gmp": failed

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

Normally I'd assume I haven't correctly configured something, yet I had no problem building and running GHC on this machine a month or so ago...

Trac metadata

Trac field	Value
Version	8.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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