[GHC] #8694: ghc -M doesn't handle addDependentFile or #included files

[GHC]

#8694: ghc -M doesn't handle addDependentFile or #included files
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       Reporter:  simonmar          |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:  7.10.1
      Component:  Compiler          |           Version:  7.6.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 ghc -M doesn't emit dependencies specified by TH's `addDependentFile`, not
 does it emit dependencies for `#include`d files.

 The former is quite hard to do, because it requires compiling the code: we
 only have the information about `addDependentFile` calls after
 compilation.  So in order to fix this, `ghc -c` would have to drop some
 information somewhere for the build system to pick up.

 In theory we should only have to preprocess files to get the list of
 #included files, and ghc -M already preprocesses all the files.  However,
 currently #included files are picked up by the lexer during parsing, so
 fixing this isn't trivial.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8694>
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