[GHC] #10741: add flag to dump module and package dependencies

[GHC]

#10741: add flag to dump module and package dependencies
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              Reporter:  elaforge    |             Owner:
                  Type:  feature     |            Status:  new
  request                            |
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 You can already dump module and package dependencies with -M -include-pkg-
 deps, but it wants to modify a Makefile, so it's not so convenient for
 things that are not make.  For other build systems, it would be convenient
 to get this on stdout in an easily parseable form.  Say X/A.hs imports
 Y/B.hs, which imports Z/C.hs, and they all use package 'base' and
 'containers':

 {{{
 % ghc -Mstdout X/A.hs
 X/A.h
 Y/B.hs
 Y/B.hs
 Z/C.hs

 base containers
 %
 }}}

 I don't know about what the output format should be, but assuming no
 newlines in filenames, and package names never have spaces, it seems
 simplest to do something like:

 [src ++ "\n" ++ dest ++ "\n" | (src, dest) <- moduleDeps]
 ++ "\n" ++ unwords packageDeps

 It could use haskell syntax like --info, but then you'd need a full
 haskell parser just to read it, which is not a problem for shake, but
 probably inconvenient for other build systems.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10741>
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