#11153: building lens-4.12.3 impossible happened: dupe _hs_primitive_memcpy -----------------------------------------+--------------------------------- Reporter: blippy | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: libraries (other) | Version: 7.10.2 Keywords: | Operating System: Windows Architecture: x86 | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -----------------------------------------+--------------------------------- I issued the command: stack install lens hoping to upgrade to lens-4.13 and I received the following error log: GHC runtime linker: fatal error: I found a duplicate definition for symbol _hsprimitive_memcpy whilst processing object file C:\apps\HaskellPlatform\7.10.2-a\lib\extralibs\primitive-0.6\HSprimitive-0.6-3d4UsQu7pJCEtlsxN3gLjk.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: panic! (the 'impossible' happened) (GHC version 7.10.2 for i386-unknown-mingw32): loadObj "C:\\apps\\HaskellPlatform\\7.10.2-a\\lib\\extralibs\\primitive-0.6\\HSprimitive-0.6-3d4UsQu7pJCEtlsxN3gLjk.o": failed Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11153 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler