[GHC] #14482: GHC -M mode fails to ensure that boot files are built before source files

[GHC]

#14482: GHC -M mode fails to ensure that boot files are built before source files
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14481            |  Differential Rev(s):  Phab:D4208
       Wiki Page:                    |
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Comment (by simonpj):

 The original problem (which isn't clearly stated above):

 * `A.hs-boot` must be compiled before `A.hs`.  Otherwise there is no check
 that `A.hs-boot` correctly reflects `A.hs`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14482#comment:7>
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