[GHC] #13319: Generate makefile dependencies suitable for ghc --make!

[GHC]

#13319: Generate makefile dependencies suitable for ghc --make!
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           Reporter:  1chb           |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 When using `ghc --make` to generate a binary, I'm interested to know what
 source files was used. I want that information to tell when to regenerate
 the binary. Yes, I use a `gmake` files to build my binaries even for `ghc`
 generated binaries.

 `gmake` is very convenient and useful as is `ghc --make`, but it is
 difficult to combine these two. For now, I can always call `ghc --make`
 but it takes extra build times. Especially when there are many binaries to
 build.

 I have considered the `-M` flag but it seems to be usable for separate
 compilation only.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13319>
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