[GHC] #14018: Expose more pipeline functionality to GHC API

[GHC]

#14018: Expose more pipeline functionality to GHC API
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        Reporter:  literon           |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by literon):

 Generally a lot of magic happening in directly in `main` and `main'`. I
 found #11194 which implies the Frontend Plugin mode is supposed to
 shortcut having to reimplement these.

 That said, the (agreeably short, relative to 'main') functionality of
 `doMake`, namely compiling the non-Haskell sources is not executed in
 frontend mode. I wonder if there is a resource (or if there should be)
 that describes caveats/differences of frontend mode vs other major modes?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14018#comment:1>
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