[GHC] #15837: Hadrian should build dynamically linked ghc binary

[GHC]

#15837: Hadrian should build dynamically linked ghc binary
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           Reporter:  davide         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.6.1
  (Hadrian)                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The ghc binary is dynamically linked via make in various flavors (e.g.
 quick). Hadrian builds a static linked binary in these cases (this is a
 bug). Various change are needed to fix this:

 1. Add new .cabal file field extra-dynamic-library-flavours (see
 [https://github.com/haskell/cabal/pull/5606 this PR]).
 2. Use .cabal extra-dynamic-library-flavours for the RTS (see
 [https://github.com/snowleopard/hadrian/issues/695#issue-367436377 this
 comment], depends on 1.)
 3. Hadrian: fix management of nontrivial dynamic flavours of libHSrts (see
 [https://github.com/snowleopard/hadrian/pull/698 this PR]).
 4. Hadrian should build ghc with the `-fPIC -dynamic` options (see
 [https://github.com/DavidEichmann/ghc/commit/752021f69f577b678630302b567fd712c565624b
 #diff-408bbe46d4afae11991cbadb2c531b78 this comment], depends on 3.).
 5. Use the correct relative path to the dynamically linked libraries (see
 [https://phabricator.haskell.org/D5281 this change], depends on 3. and
 4.).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15837>
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