[GHC] #9010: TemplateHaskell leads to an "unknown symbol" error

[GHC]

#9010: TemplateHaskell leads to an "unknown symbol" error
-------------------------------------+-------------------------------------
        Reporter:  Feuerbach         |                Owner:
            Type:  bug               |               Status:  infoneeded
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 For example, when I build `play` with `cabal install --ghc-option=-v`, I
 get a bunch of output including the lines
 {{{
 ...
 Loading package primitive-0.6.1.0 ... linking ... done.
 Loading package vector-0.11.0.0 ... linking ... done.
 Loading package lens-4.13 ... linking ... done.
 *** gcc:
 /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/tmp/th-unknown-
 symbol-test/.cabal-sandbox/lib/x86_64-linux-
 ghc-7.10.1/hsope_3XpfF7vOgxLEUT7DVeoPSc --print-file-name
 libopencv_calib3d.so
 *** gcc:
 /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/tmp/th-unknown-
 symbol-test/.cabal-sandbox/lib/x86_64-linux-
 ghc-7.10.1/hsope_3XpfF7vOgxLEUT7DVeoPSc --print-file-name
 libopencv_contrib.so
 ...
 *** gcc:
 /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/tmp/th-unknown-
 symbol-test/.cabal-sandbox/lib/x86_64-linux-
 ghc-7.10.1/hsope_3XpfF7vOgxLEUT7DVeoPSc --print-file-name
 libopencv_videostab.so
 Loading package hs-opencv-binding-0.0.0 ... linking ... done.
 }}}
 That means GHC loaded the dynamic OpenCV libraries with `dlopen()`. In
 your case, it is apparently not doing that.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9010#comment:14>
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