#16063: ghc-8.6.3 + Mac OSX + FFI dependency causes 'impossible happened' compiler failure -------------------------------------+------------------------------------- Reporter: benselfridge | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Keywords: | Operating System: MacOS X Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- 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. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16063 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler