[GHC] #9381: Implement rdynamic

[GHC]

#9381: Implement rdynamic
-------------------------------------+-------------------------------------
       Reporter:  facundo.dominguez  |                   Owner:
           Type:  feature request    |  facundo.dominguez
       Priority:  normal             |                  Status:  new
      Component:  Compiler           |               Milestone:
       Keywords:                     |                 Version:  7.8.2
   Architecture:  Unknown/Multiple   |        Operating System:
     Difficulty:  Unknown            |  Unknown/Multiple
     Blocked By:                     |         Type of failure:
Related Tickets:  7015               |  None/Unknown
                                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 Currently ghc ignores the `-rdynamic` flag.

 With a small effort it can be used as a synonym of `-optl -rdynamic` in
 linux and `-optl -export-all-symbols` in windows/mingw32.

 In other platforms, similar translations must be possible to get the
 symbols of an executable exported.

 This feature would improve usability of an upcoming implementation of
 #7015.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9381>
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