[GHC] #843: Dependency information for the linking step

[GHC]

#843: Dependency information for the linking step
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    Reporter:  pf1 at volker-wysk.de  |        Owner:                       
        Type:  feature request     |       Status:  new                  
    Priority:  normal              |    Milestone:                       
   Component:  Compiler            |      Version:  6.4.1                
    Severity:  normal              |     Keywords:  dependency generation
          Os:  Linux               |   Difficulty:  Easy (1 hr)          
Architecture:  Unknown             |  
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I'd like to let GHC report which object files are linked together when
 called with "--make", such as: "ghc -M --make Prog.hs". "-M" can't be used
 in conjunction with "--make".

 I have many small main programs that share inner modules. Some of the
 inner and main modules are c2hs-input files (.chs), which must be
 processed by c2hs first, to produce a .hs file. "ghc --make" can be used
 in the linking step, but it doesn't know about c2hs, and can't call it
 automatically. So I need the makefile to take care of the dependencies.

 Normally, you'd have just one main module, and link everything together.
 But I want to recompile only the modules needed for some specific program.
 There's no easy way to get the information which object files make up a
 program, and must be recompiled, because the object files depend only on
 the .hi-files of the imported modules, not on the modules themselves.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/843>
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