[GHC] #11748: GHC runtime linker: fatal error: I found a duplicate definition for symbol

[GHC]

#11748: GHC runtime linker: fatal error: I found a duplicate definition for symbol
-------------------------------------+-------------------------------------
        Reporter:  jeiea             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
  (Linking)                          |
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11223            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by jeiea):

 It is simplified drastically. I found just using foreign imported rgb
 function from other package emits same error.
 But I don't know whether its cause is same to original project.
 {{{
 >stack build
 child1-0.1.0.0: configure
 child1-0.1.0.0: build
 child1-0.1.0.0: copy/register
 ghc-bug-maybe-0.1.0.0: configure
 ghc-bug-maybe-0.1.0.0: build
 Completed 2 action(s).

 --  While building package ghc-bug-maybe-0.1.0.0 using:
       C:\AppData\Roaming\stack\setup-exe-cache\x86_64-windows\setup-
 Simple-Cabal-1.22.5.0-ghc-7.10.3.exe --builddir=.stack-work\dist\2672c1f3
 build lib:ghc-bug-maybe exe:ghc-bug-maybe-exe --ghc-options " -ddump-hi
 -ddump-to-file"
     Process exited with code: ExitFailure 1
     Logs have been written to: D:\ghc-bug-maybe-2\.stack-work\logs\ghc-
 bug-maybe-0.1.0.0.log

     Configuring ghc-bug-maybe-0.1.0.0...
     Preprocessing library ghc-bug-maybe-0.1.0.0...
     [1 of 1] Compiling Lib              ( src\Lib.hs, .stack-
 work\dist\2672c1f3\build\Lib.o )
     In-place registering ghc-bug-maybe-0.1.0.0...
     Preprocessing executable 'ghc-bug-maybe-exe' for ghc-bug-
 maybe-0.1.0.0...
     [1 of 1] Compiling Main             ( app\Main.hs, .stack-
 work\dist\2672c1f3\build\ghc-bug-maybe-exe\ghc-bug-maybe-exe-tmp\Main.o )
     Linking .stack-work\dist\2672c1f3\build\ghc-bug-maybe-exe\ghc-bug-
 maybe-exe.exe ...
     D:\ghc-bug-maybe2\.stack-work\install\b67103b8\lib\x86_64-windows-
 ghc-7.10.3\child1-0.1.0.0-CPbTpkFzTQ4DOsiuVDCvQJ/libHSchild1-0.1.0.0-CPbTpkFzTQ4DOsiuVDCvQJ.a(Lib.o):fake:(.text+0x6f):
 undefined reference to `rgb'
     collect2.exe: error: ld returned 1 exit status
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11748#comment:3>
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