#12684: GHC panic due to bindnow linker flag -------------------------------------+------------------------------------- Reporter: basvandijk | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Linux Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: 11238 Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- As [https://ghc.haskell.org/trac/ghc/ticket/10458#comment:45 explained in #10458] our `haskell-opencv` library failed to build on NixOS-16.09 due to its recently introduced [https://nixos.org/nixpkgs/manual/#sec-hardening- in-nixpkgs hardening features]. Specifically the problem is that NixOS is setting the `-z bindnow` linker flag which causes the build to fail with: {{{ ... [33 of 64] Compiling OpenCV.Internal.Core.Types.Mat ( src/OpenCV/Internal/Core/Types/Mat.hs, dist/build/OpenCV/Internal/Core/Types/Mat.o ) <no location info>: error: ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-linux): Loading temp shared object failed: /run/user/1001/ghc8697_0/libghc_200.so: undefined symbol: inline_c_OpenCV_Internal_Exception_1_2402dbf3aea4f7f79392b71ed42618962a22e9aa }}} Fortunately this flag can be [https://github.com/LumiGuide/haskell- opencv/commit/5ea490af7662fe74b3740619963d37f1fd91e3d4 disabled] so I'm now able to build the library successfully. However, it would be nice if GHC is able to work around this. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12684 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler