[GHC] #13828: Re-linking is not avoided when -dynamic is used

[GHC]

#13828: Re-linking is not avoided when -dynamic is used
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           Reporter:  nh2            |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.2
  (Linking)                          |
           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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 In normal builds, GHC will no re-link executables when that's not necesary
 (e.g. when no code has changed).

 But when `-dynamic` is used, it re-links every time.

 Minimal example for reproduction: https://github.com/nh2/cabal-relink-test

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13828>
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