[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:  davide
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.6.1
  (Hadrian)                          |
      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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Description changed by davide:

Old description:

> 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.).

New description:

 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.).
 6. Build ghc-iserv-dyn, as it is will be required required by many tests
 (see/depends on [https://phabricator.haskell.org/D5255 patch for ghc-
 iserv-prof])

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15837#comment:3>
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