[GHC] #7810: make show VALUE=VAR depends on ghc-stage1

[GHC]

#7810: make show VALUE=VAR depends on ghc-stage1
-------------------------------------+-------------------------------------
        Reporter:  kgardas           |                   Owner:  thomie
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Build System      |                 Version:  7.7
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D1064
-------------------------------------+-------------------------------------
Changes (by thomie):

 * owner:  thoughtpolice => thomie
 * differential:   => Phab:D1064


Comment:

 I have a patch that adds a `make show!` command. From the commit message:

     A normal `make show` starts a build of the ghc-stage1 compiler, to
     create package-data.mk files. This version doesn't read those, so it
     will work right after ./configure.

 Does that sound reasonable to add?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7810#comment:7>
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