#15140: GHC 8.4.2 installation crash with Stack ------------------------------------------+------------------------------ Reporter: fpanahi | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Build System | Version: 8.4.2 Resolution: | Keywords: Operating System: Windows | Architecture: x86 Type of failure: Installing GHC failed | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | ------------------------------------------+------------------------------ Comment (by fpanahi): Here is the error message: package directory (directory-1.3.1.5-J5MwWdrFyEn9y6RDLELiL1) requires time-1.8.0.2-D1fwd9ZaD3eDd2StmPCsSC Preprocessing library for ghc-exactprint-0.5.6.1.. Building library for ghc-exactprint-0.5.6.1.. [ 1 of 13] Compiling Language.Haskell.GHC.ExactPrint.Types ( src\Language\Haskell\GHC\ExactPrint\Types.hs, .stack- work\dist\7d103d30\build\Language\Haskell\GHC\ExactPrint\Types.o ) [ 2 of 13] Compiling Language.Haskell.GHC.ExactPrint.Lookup ( src\Language\Haskell\GHC\ExactPrint\Lookup.hs, .stack- work\dist\7d103d30\build\Language\Haskell\GHC\ExactPrint\Lookup.o ) [ 3 of 13] Compiling Language.Haskell.GHC.ExactPrint.AnnotateTypes ( src\Language\Haskell\GHC\ExactPrint\AnnotateTypes.hs, .stack- work\dist\7d103d30\build\Language\Haskell\GHC\ExactPrint\AnnotateTypes.o ) GHC runtime linker: fatal error: I found a duplicate definition for symbol rgb whilst processing object file C:\Users\Farhad\AppData\Local\Programs\stack\x86_64-windows\ghc-8.4.2\lib\Win32-2.6.1.0\HSWin32-2.6.1.0.o The symbol was previously defined in C:\sr\snapshots\03fa9465\lib\x86_64-windows- ghc-8.4.2\Win32-2.5.4.1-LVNqK0SwW285hUwHpPOkae\HSWin32-2.5.4.1-LVNqK0SwW285hUwHpPOkae.o This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. ghc.EXE: panic! (the 'impossible' happened) (GHC version 8.4.2 for x86_64-unknown-mingw32): loadObj "C:\\Users\\Farhad\\AppData\\Local\\Programs\\stack\\x86_64-windows\\ghc-8.4.2\\lib\\Win32-2.6.1.0\\HSWin32-2.6.1.0.o": failed Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug c:\hie> -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15140#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler