[GHC] #9121: Presence of dyn_o files not checked upon recompilation

[GHC]

#9121: Presence of dyn_o files not checked upon recompilation
-------------------------------------+-------------------------------------
        Reporter:  andreas.abel      |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Driver            |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by ezyang):

 I definitely can believe that this can happen, because I'm pretty sure the
 recompilation checker only checks o files (and not dyn_o files). Easy test
 case:

 {{{
 ghc --make A.hs -dynamic-too
 rm A.dyn_o
 ghc --make A.hs -dynamic-too
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9121#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler