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ghc-8.6.3 + Mac OSX + FFI dependency causes 'impossible happened' compiler failure

I am trying to build this library: https://github.com/GaloisInc/grift

The build works perfectly on my Mac OS X system under ghc-8.4.4 via the README instructions. However, if I update to ghc-8.6.3, I get the following error:

Building library for bv-sized-float-0.1.0..
[1 of 2] Compiling Data.BitVector.Sized.Float ( src/Data/BitVector/Sized/Float.hs, /Users/benselfridge/grift/dist-newstyle/build/x86_64-osx/ghc-8.6.3/bv-sized-float-0.1.0/build/Data/BitVector/Sized/Float.o )
[2 of 2] Compiling Data.BitVector.Sized.Float.App ( src/Data/BitVector/Sized/Float/App.hs, /Users/benselfridge/grift/dist-newstyle/build/x86_64-osx/ghc-8.6.3/bv-sized-float-0.1.0/build/Data/BitVector/Sized/Float/App.o )
ghc: loadArchive: Failed reading header from `/Users/benselfridge/grift/dist-newstyle/build/x86_64-osx/ghc-8.6.3/softfloat-hs-0.1.0/build/SoftFloat'
ghc: panic! (the 'impossible' happened)
  (GHC version 8.6.3 for x86_64-apple-darwin):
	loadArchive "/Users/benselfridge/grift/dist-newstyle/build/x86_64-osx/ghc-8.6.3/softfloat-hs-0.1.0/build/SoftFloat": failed

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

The library "softfloat-hs" is a Haskell library that calls C functions that are dynamically linked. If I try to run it within this project via "cabal new-repl softfloat-hs", the dependency works fine. It's only when I try to build "bv-sized-float", which depends on softfloat-hs, that I get the above error.

Trac metadata
Trac field Value
Version 8.6.3
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
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