[GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

[GHC]

#13366: addCStub doesn't allow control over compiler flags or source file file
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        Reporter:  bgamari           |                Owner:  bitonic
            Type:  feature request   |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
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Comment (by facundo.dominguez):

 Is this addressed after merging Phab:D3280? IIUC, it is ok to use `-optc`
 to affect all stubs in a module as long as `-x lang` is not given.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:8>
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