Re: [GHC] #10458: GHCi fails to load shared object (the 'impossible' happened)

14 Sep 2016

      #10458: GHCi fails to load shared object (the 'impossible' happened)
-------------------------------+----------------------------------------
        Reporter:  rleslie     |                Owner:
            Type:  bug         |               Status:  new
        Priority:  highest     |            Milestone:  8.0.1
       Component:  GHCi        |              Version:  7.10.1
      Resolution:              |             Keywords:
Operating System:  Linux       |         Architecture:  Unknown/Multiple
 Type of failure:  GHCi crash  |            Test Case:
      Blocked By:              |             Blocking:
 Related Tickets:              |  Differential Rev(s):  Phab:D1631
       Wiki Page:              |
-------------------------------+----------------------------------------
Changes (by basvandijk):

 * status:  closed => new
 * owner:  trommler =>
 * resolution:  fixed =>

Comment:

 As also mentioned in #12152 I'm getting the following panic with GHC-8.0.1
 which looks very similar to the error discussed in this ticket:

 {{{
 $ git clone https://github.com/LumiGuide/haskell-opencv.git
 $ cd haskell-opencv
 $ nix-shell -I nixpkgs=../nixpkgs # a checkout of a recent nixos-16.09
 $ rm -rf dist/
 $ cabal build -v
 Package has never been configured. Configuring with default flags. If this
 fails, please run configure manually.
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc --numeric-
 version
 looking for tool ghc-pkg near compiler in
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin
 found ghc-pkg in
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc-pkg
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc-pkg
 --version
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc --supported-
 languages
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc --info
 Reading available packages...
 /nix/store/pkymfih8lf7j3ib6bfab7srri4xiyw34-pkg-config-0.29/bin/pkg-config
 --version
 /nix/store/pkymfih8lf7j3ib6bfab7srri4xiyw34-pkg-config-0.29/bin/pkg-config
 --list-all
 /nix/store/pkymfih8lf7j3ib6bfab7srri4xiyw34-pkg-config-0.29/bin/pkg-config
 --modversion poppler-cairo Wand-6.Q16 'ImageMagick++-6.Q16' python2 formw
 'ncurses++' openssl libkeymap libgvc MagickWand-6.Q16 blkid form libxdot
 opencv ImageMagick menu smartcols libsystemd-login gimpui-2.0 libcdt
 libgvpr devmapper com_err libcurl libssl libsystemd-journal polkit-
 gobject-1 libecpg libsystemd polkit-agent-1 libpathplan nix-main libpci
 poppler panelw Wand libcap xorg-server e2p ImageMagick-6.Q16 liblzma
 gimpthumb-2.0 ncurses lvm2app MagickCore sqlite3 python libpq libcgraph
 xtables libprocps libkmod libip4tc libecpg_compat libpgtypes nix-store
 libcrypto poppler-splash libudev panel ext2fs libiptc poppler-glib
 'Magick++-6.Q16' python-2.7 fdisk uuid libsystemd-daemon nix-expr poppler-
 cpp libip6tc mount fuse MagickWand gimp-2.0 fontconfig udisks2 ncursesw ss
 'ImageMagick++' MagickCore-6.Q16 'Magick++' menuw libsystemd-id128
 'ncurses++w'
 Choosing modular solver.
 Resolving dependencies...
 creating dist/setup
 creating dist
 creating dist/setup
 copy ./Setup.hs to ./dist/setup/setup.hs
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc --make -odir
 ./dist/setup -hidir ./dist/setup -i -i. -package-id Cabal-1.24.0.0
 ./dist/setup/setup.hs -o ./dist/setup/setup -threaded
 [1 of 1] Compiling Main             ( dist/setup/setup.hs,
 dist/setup/Main.o )
 Linking ./dist/setup/setup ...
 ./dist/setup/setup configure --verbose=2 --builddir=dist --ghc
 --prefix=/home/bas.van.dijk/.cabal --user
 --extra-prog-path=/home/bas.van.dijk/.cabal/bin
 --dependency=aeson=aeson-0.11.2.1-11xZO4dSHJ36B3esP34sNx
 --dependency=base=base-4.9.0.0
 --dependency=base64-bytestring=base64-bytestring-1.0.0.1-In9M41tLtcS9QYt3QpGpNY
 --dependency=bindings-DSL=bindings-DSL-1.0.23-GUrVdpTUVQC2JWoov2sGwA
 --dependency=bytestring=bytestring-0.10.8.1
 --dependency=containers=containers-0.5.7.1
 --dependency=deepseq=deepseq-1.4.2.0
 --dependency=inline-c=inline-c-0.5.5.7-3JCuNEZtXHO4YTLZSRWOQ2
 --dependency=inline-c-cpp=inline-c-cpp-0.1.0.0-2wSjs2z7tfoLnsB36U1XGl
 --dependency=linear=linear-1.20.5-2Z9jl9x0ElZ4xkEQ6d4gVk
 --dependency=primitive=primitive-0.6.1.0-Ip44DqhfCp21tTUYbecwa
 --dependency=repa=repa-3.4.1.1-FdCcjPvmfDZGBwGc0CsqjV
 --dependency=template-haskell=template-haskell-2.11.0.0
 --dependency=text=text-1.2.2.1-JAnD1x1IHr6H3rdrqlXcyH
 --dependency=transformers=transformers-0.5.2.0
 --dependency=vector=vector-0.11.0.0-BEDZb5o2QOhGbIm6ky7rl6 --disable-tests
 --exact-configuration --disable-benchmarks
 Configuring opencv-0.0.0...
 Dependency aeson ==0.11.2.1: using aeson-0.11.2.1
 Dependency base ==4.9.0.0: using base-4.9.0.0
 Dependency base64-bytestring ==1.0.0.1: using base64-bytestring-1.0.0.1
 Dependency bindings-DSL ==1.0.23: using bindings-DSL-1.0.23
 Dependency bytestring ==0.10.8.1: using bytestring-0.10.8.1
 Dependency containers ==0.5.7.1: using containers-0.5.7.1
 Dependency deepseq ==1.4.2.0: using deepseq-1.4.2.0
 Dependency inline-c ==0.5.5.7: using inline-c-0.5.5.7
 Dependency inline-c-cpp ==0.1.0.0: using inline-c-cpp-0.1.0.0
 Dependency linear ==1.20.5: using linear-1.20.5
 Dependency primitive ==0.6.1.0: using primitive-0.6.1.0
 Dependency repa ==3.4.1.1: using repa-3.4.1.1
 Dependency template-haskell ==2.11.0.0: using template-haskell-2.11.0.0
 Dependency text ==1.2.2.1: using text-1.2.2.1
 Dependency transformers ==0.5.2.0: using transformers-0.5.2.0
 Dependency vector ==0.11.0.0: using vector-0.11.0.0
 Dependency opencv -any: using version 3.1.0
 Using Cabal-1.24.0.0 compiled by ghc-8.0
 Using compiler: ghc-8.0.1
 Using install prefix: /home/bas.van.dijk/.cabal
 Binaries installed in: /home/bas.van.dijk/.cabal/bin
 Libraries installed in:
 /home/bas.van.dijk/.cabal/lib/x86_64-linux-
 ghc-8.0.1/opencv-0.0.0-2zTtfFNABNdFAnLU4MNJ6b
 Private binaries installed in: /home/bas.van.dijk/.cabal/libexec
 Data files installed in:
 /home/bas.van.dijk/.cabal/share/x86_64-linux-ghc-8.0.1/opencv-0.0.0
 Documentation installed in:
 /home/bas.van.dijk/.cabal/share/doc/x86_64-linux-ghc-8.0.1/opencv-0.0.0
 Configuration files installed in: /home/bas.van.dijk/.cabal/etc
 No alex found
 Using ar found on system at:
 /nix/store/v77miigq2dx55ga1hxfv3k7v9a873472-binutils-2.27/bin/ar
 No c2hs found
 Using cpphs version 1.20.2 found on system at:
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/cpphs
 Using gcc version 5.4.0 given by user at:
 /nix/store/45qrn064f92kfxnjg99z39zxda671h6f-gcc-wrapper-5.4.0/bin/g++
 Using ghc version 8.0.1 found on system at:
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc
 Using ghc-pkg version 8.0.1 found on system at:
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc-pkg
 No ghcjs found
 No ghcjs-pkg found
 No greencard found
 Using haddock version 2.17.2 found on system at:
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/haddock
 No happy found
 Using haskell-suite found on system at: haskell-suite-dummy-location
 Using haskell-suite-pkg found on system at: haskell-suite-pkg-dummy-
 location
 No hmake found
 Using hpc version 0.67 found on system at:
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/hpc
 Using hsc2hs version 0.68 found on system at:
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/hsc2hs
 Using hscolour version 1.24 found on system at:
 /run/current-system/sw/bin/HsColour
 No jhc found
 Using ld given by user at:
 /nix/store/45qrn064f92kfxnjg99z39zxda671h6f-gcc-wrapper-5.4.0/bin/g++
 No lhc found
 No lhc-pkg found
 Using pkg-config version 0.29 found on system at:
 /nix/store/pkymfih8lf7j3ib6bfab7srri4xiyw34-pkg-config-0.29/bin/pkg-config
 Using strip version 2.27 found on system at:
 /nix/store/v77miigq2dx55ga1hxfv3k7v9a873472-binutils-2.27/bin/strip
 Using tar found on system at:
 /nix/store/blzs121zpxzms8axnblp1pbbzphrsb2r-gnutar-1.29/bin/tar
 No uhc found
 creating dist/setup
 ./dist/setup/setup build --verbose=2 --builddir=dist --jobs=2
 Component build order: library
 creating dist/build
 creating dist/build/autogen
 Building opencv-0.0.0...
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc-pkg init
 dist/package.conf.inplace
 Preprocessing library opencv-0.0.0...
 creating dist/build/OpenCV/Core
 creating dist/build/OpenCV
 creating dist/build/OpenCV/Core
 ...
 ... Lots of calls to hsc2hs
 ...
 Building library...
 creating dist/build
 /nix/store/91grrinb827jsdr44yd2lqls9i7z2az0-ghc-8.0.1/bin/ghc \
   --make \
   -fbuilding-cabal-package \
   -O \
   -j2 \
   -static -dynamic-too \
   -dynosuf dyn_o -dynhisuf dyn_hi \
   -outputdir dist/build -odir dist/build -hidir dist/build -stubdir
 dist/build \
   -i \
   -idist/build \
   -isrc \
   -idist/build/autogen \
   -Idist/build/autogen \
   -Idist/build \
   -Iinclude \
   -I/nix/store/gyqgb314gb2jny8xjix3bdrly50p9mrz-
 opencv-3.1.0/include/opencv \
   -I/nix/store/gyqgb314gb2jny8xjix3bdrly50p9mrz-opencv-3.1.0/include \
   -optP-include \
   -optPdist/build/autogen/cabal_macros.h \
   -this-unit-id opencv-0.0.0-2zTtfFNABNdFAnLU4MNJ6b \
   -hide-all-packages \
   -package-db dist/package.conf.inplace \
   -package-id aeson-0.11.2.1-11xZO4dSHJ36B3esP34sNx \
   -package-id base-4.9.0.0 \
   -package-id base64-bytestring-1.0.0.1-In9M41tLtcS9QYt3QpGpNY \
   -package-id bindings-DSL-1.0.23-GUrVdpTUVQC2JWoov2sGwA \
   -package-id bytestring-0.10.8.1 -package-id containers-0.5.7.1 \
   -package-id deepseq-1.4.2.0 \
   -package-id inline-c-0.5.5.7-3JCuNEZtXHO4YTLZSRWOQ2 \
   -package-id inline-c-cpp-0.1.0.0-2wSjs2z7tfoLnsB36U1XGl \
   -package-id linear-1.20.5-2Z9jl9x0ElZ4xkEQ6d4gVk \
   -package-id primitive-0.6.1.0-Ip44DqhfCp21tTUYbecwa \
   -package-id repa-3.4.1.1-FdCcjPvmfDZGBwGc0CsqjV \
   -package-id template-haskell-2.11.0.0 \
   -package-id text-1.2.2.1-JAnD1x1IHr6H3rdrqlXcyH \
   -package-id transformers-0.5.2.0 \
   -package-id vector-0.11.0.0-BEDZb5o2QOhGbIm6ky7rl6 \
   -XHaskell2010 -XBangPatterns -XDataKinds -XFlexibleContexts \
   -XFlexibleInstances -XLambdaCase -XOverloadedStrings \
   -XPackageImports -XPolyKinds -XScopedTypeVariables \
   -XTupleSections -XTypeFamilies -XTypeOperators \
   OpenCV OpenCV.Calib3d OpenCV.Core.ArrayOps OpenCV.Core.Types
 OpenCV.Core.Types.Mat OpenCV.Core.Types.Mat.HMat
 OpenCV.Core.Types.Mat.Repa OpenCV.Core.Types.Matx OpenCV.Core.Types.Point
 OpenCV.Core.Types.Rect OpenCV.Core.Types.Size OpenCV.Core.Types.Vec
 OpenCV.Exception OpenCV.Features2d OpenCV.HighGui OpenCV.ImgCodecs
 OpenCV.ImgProc.ColorMaps OpenCV.ImgProc.Drawing
 OpenCV.ImgProc.FeatureDetection OpenCV.ImgProc.GeometricImgTransform
 OpenCV.ImgProc.ImgFiltering OpenCV.ImgProc.MiscImgTransform
 OpenCV.ImgProc.MiscImgTransform.ColorCodes OpenCV.ImgProc.ObjectDetection
 OpenCV.ImgProc.StructuralAnalysis OpenCV.ImgProc.Types OpenCV.JSON
 OpenCV.Photo OpenCV.TypeLevel OpenCV.Unsafe OpenCV.Video
 OpenCV.Video.MotionAnalysis OpenCV.VideoIO.VideoCapture OpenCV.Internal
 OpenCV.Internal.Mutable OpenCV.Internal.C.Inline
 OpenCV.Internal.C.PlacementNew OpenCV.Internal.C.PlacementNew.TH
 OpenCV.Internal.C.Types OpenCV.Internal.Calib3d.Constants
 OpenCV.Internal.Core.ArrayOps OpenCV.Internal.Core.Types
 OpenCV.Internal.Core.Types.Constants OpenCV.Internal.Core.Types.Mat
 OpenCV.Internal.Core.Types.Mat.Depth
 OpenCV.Internal.Core.Types.Mat.Marshal
 OpenCV.Internal.Core.Types.Mat.ToFrom OpenCV.Internal.Core.Types.Matx
 OpenCV.Internal.Core.Types.Matx.TH OpenCV.Internal.Core.Types.Point
 OpenCV.Internal.Core.Types.Point.TH OpenCV.Internal.Core.Types.Rect
 OpenCV.Internal.Core.Types.Rect.TH OpenCV.Internal.Core.Types.Size
 OpenCV.Internal.Core.Types.Size.TH OpenCV.Internal.Core.Types.Vec
 OpenCV.Internal.Core.Types.Vec.TH OpenCV.Internal.Exception
 OpenCV.Internal.ImgCodecs OpenCV.Internal.ImgProc.MiscImgTransform
 OpenCV.Internal.ImgProc.MiscImgTransform.TypeLevel
 OpenCV.Internal.ImgProc.MiscImgTransform.ColorCodes
 OpenCV.Internal.ImgProc.Types OpenCV.Internal.Photo.Constants \
   -Wall \
   -fwarn-incomplete-patterns \
   -funbox-strict-fields \
   -O2
 [ 1 of 64] Compiling OpenCV.Internal.Photo.Constants (
 dist/build/OpenCV/Internal/Photo/Constants.hs,
 dist/build/OpenCV/Internal/Photo/Constants.o )
 [ 2 of 64] Compiling OpenCV.Internal.ImgProc.MiscImgTransform (
 dist/build/OpenCV/Internal/ImgProc/MiscImgTransform.hs,
 dist/build/OpenCV/Internal/ImgProc/MiscImgTransform.o )
 [ 3 of 64] Compiling OpenCV.Internal.ImgCodecs (
 dist/build/OpenCV/Internal/ImgCodecs.hs,
 dist/build/OpenCV/Internal/ImgCodecs.o )
 [ 4 of 64] Compiling OpenCV.Internal.Core.Types.Constants (
 dist/build/OpenCV/Internal/Core/Types/Constants.hs,
 dist/build/OpenCV/Internal/Core/Types/Constants.o )
 [ 5 of 64] Compiling OpenCV.Internal.C.PlacementNew (
 src/OpenCV/Internal/C/PlacementNew.hs,
 dist/build/OpenCV/Internal/C/PlacementNew.o )
 [ 6 of 64] Compiling OpenCV.Internal.C.PlacementNew.TH (
 src/OpenCV/Internal/C/PlacementNew/TH.hs,
 dist/build/OpenCV/Internal/C/PlacementNew/TH.o )
 [ 7 of 64] Compiling OpenCV.Internal.Mutable (
 src/OpenCV/Internal/Mutable.hs, dist/build/OpenCV/Internal/Mutable.o )
 [ 8 of 64] Compiling OpenCV.Internal.Core.ArrayOps (
 dist/build/OpenCV/Internal/Core/ArrayOps.hs,
 dist/build/OpenCV/Internal/Core/ArrayOps.o )
 [ 9 of 64] Compiling OpenCV.Internal  ( src/OpenCV/Internal.hs,
 dist/build/OpenCV/Internal.o )
 [10 of 64] Compiling OpenCV.Internal.Calib3d.Constants (
 dist/build/OpenCV/Internal/Calib3d/Constants.hs,
 dist/build/OpenCV/Internal/Calib3d/Constants.o )
 [11 of 64] Compiling OpenCV.Internal.C.Types (
 src/OpenCV/Internal/C/Types.hs, dist/build/OpenCV/Internal/C/Types.o )
 [12 of 64] Compiling OpenCV.Internal.Core.Types.Matx (
 src/OpenCV/Internal/Core/Types/Matx.hs,
 dist/build/OpenCV/Internal/Core/Types/Matx.o )
 [13 of 64] Compiling OpenCV.Internal.Core.Types.Matx.TH (
 src/OpenCV/Internal/Core/Types/Matx/TH.hs,
 dist/build/OpenCV/Internal/Core/Types/Matx/TH.o )
 [14 of 64] Compiling OpenCV.Internal.Core.Types.Point (
 src/OpenCV/Internal/Core/Types/Point.hs,
 dist/build/OpenCV/Internal/Core/Types/Point.o )
 [15 of 64] Compiling OpenCV.Internal.Core.Types.Point.TH (
 src/OpenCV/Internal/Core/Types/Point/TH.hs,
 dist/build/OpenCV/Internal/Core/Types/Point/TH.o )
 [16 of 64] Compiling OpenCV.Internal.Core.Types.Size (
 src/OpenCV/Internal/Core/Types/Size.hs,
 dist/build/OpenCV/Internal/Core/Types/Size.o )
 [17 of 64] Compiling OpenCV.Internal.Core.Types.Size.TH (
 src/OpenCV/Internal/Core/Types/Size/TH.hs,
 dist/build/OpenCV/Internal/Core/Types/Size/TH.o )
 [18 of 64] Compiling OpenCV.Internal.Core.Types.Vec (
 src/OpenCV/Internal/Core/Types/Vec.hs,
 dist/build/OpenCV/Internal/Core/Types/Vec.o )
 [19 of 64] Compiling OpenCV.Internal.Core.Types.Vec.TH (
 src/OpenCV/Internal/Core/Types/Vec/TH.hs,
 dist/build/OpenCV/Internal/Core/Types/Vec/TH.o )
 [20 of 64] Compiling OpenCV.Internal.C.Inline (
 src/OpenCV/Internal/C/Inline.hs, dist/build/OpenCV/Internal/C/Inline.o )
 [21 of 64] Compiling OpenCV.Core.Types.Size (
 src/OpenCV/Core/Types/Size.hs, dist/build/OpenCV/Core/Types/Size.o )
 [22 of 64] Compiling OpenCV.Core.Types.Vec ( src/OpenCV/Core/Types/Vec.hs,
 dist/build/OpenCV/Core/Types/Vec.o )
 [23 of 64] Compiling OpenCV.TypeLevel ( src/OpenCV/TypeLevel.hs,
 dist/build/OpenCV/TypeLevel.o )
 [24 of 64] Compiling OpenCV.Internal.ImgProc.MiscImgTransform.TypeLevel (
 src/OpenCV/Internal/ImgProc/MiscImgTransform/TypeLevel.hs,
 dist/build/OpenCV/Internal/ImgProc/MiscImgTransform/TypeLevel.o )
 [25 of 64] Compiling OpenCV.Internal.ImgProc.MiscImgTransform.ColorCodes (
 src/OpenCV/Internal/ImgProc/MiscImgTransform/ColorCodes.hs,
 dist/build/OpenCV/Internal/ImgProc/MiscImgTransform/ColorCodes.o )
 [26 of 64] Compiling OpenCV.ImgProc.MiscImgTransform.ColorCodes (
 src/OpenCV/ImgProc/MiscImgTransform/ColorCodes.hs,
 dist/build/OpenCV/ImgProc/MiscImgTransform/ColorCodes.o )
 [27 of 64] Compiling OpenCV.Internal.Core.Types.Mat.Depth (
 src/OpenCV/Internal/Core/Types/Mat/Depth.hs,
 dist/build/OpenCV/Internal/Core/Types/Mat/Depth.o )
 [28 of 64] Compiling OpenCV.Internal.Exception (
 src/OpenCV/Internal/Exception.hs, dist/build/OpenCV/Internal/Exception.o )
 [29 of 64] Compiling OpenCV.Exception ( src/OpenCV/Exception.hs,
 dist/build/OpenCV/Exception.o )
 [30 of 64] Compiling OpenCV.Internal.Core.Types.Mat.Marshal (
 dist/build/OpenCV/Internal/Core/Types/Mat/Marshal.hs,
 dist/build/OpenCV/Internal/Core/Types/Mat/Marshal.o )
 [31 of 64] Compiling OpenCV.Core.Types.Point (
 src/OpenCV/Core/Types/Point.hs, dist/build/OpenCV/Core/Types/Point.o )
 [32 of 64] Compiling OpenCV.Internal.Core.Types (
 src/OpenCV/Internal/Core/Types.hs, dist/build/OpenCV/Internal/Core/Types.o
 )
 [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

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

 [36 of 64] Compiling OpenCV.Internal.Core.Types.Rect (
 src/OpenCV/Internal/Core/Types/Rect.hs,
 dist/build/OpenCV/Internal/Core/Types/Rect.o )
 [37 of 64] Compiling OpenCV.Internal.Core.Types.Rect.TH (
 src/OpenCV/Internal/Core/Types/Rect/TH.hs,
 dist/build/OpenCV/Internal/Core/Types/Rect/TH.o )
 [38 of 64] Compiling OpenCV.Core.Types.Rect (
 src/OpenCV/Core/Types/Rect.hs, dist/build/OpenCV/Core/Types/Rect.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_206.so: undefined symbol:
 inline_c_OpenCV_Core_Types_Point_19_5c3d561e8841e5271fd465bfb109504b1d56b3f6

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

 [39 of 64] Compiling OpenCV.Core.Types.Matx (
 src/OpenCV/Core/Types/Matx.hs, dist/build/OpenCV/Core/Types/Matx.o )
 }}}

 The details are in https://github.com/NixOS/nixpkgs/issues/18558.

 It's worth repeating here that I've successfully build `haskell-opencv`
 with GHC-8.0.1 before on an older version of `nixpkgs`. So it has probably
 something to do with how GHC is packaged in `nixpkgs` or  with the used
 `binutils`. However, a GHC panic should also warrant a ticket on the GHC
 bug tracker so here it is.

 Although this ticket is about GHCi and I'm using GHC do note that
 `haskell-opencv` makes use of template-haskell in lots of places which I
 believe is using GHCi internally.

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10458#comment:45
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler