[GHC] #13604: ghci no longer loads dynamic .o files by default if they were built with -O

[GHC]

#13604: ghci no longer loads dynamic .o files by default if they were built with -O
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        Reporter:  George            |                Owner:  dfeuer
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.2.2
       Component:  Compiler          |              Version:  8.2.1-rc1
      Resolution:                    |             Keywords:
                                     |  RecompilationCheck
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4123
       Wiki Page:                    |
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Comment (by dfeuer):

 elaforge, I think I understand kind of what you're asking for now, but
 there are some tricky questions about the UI. The biggest question is
 probably how to make interaction with `-fobject-code` sensible. In
 particular, we don't currently produce object code (ever) when `-fobject-
 code` is off. So if I type `ghci -O2 A`, where `A` depends on `B`, what
 should happen if `B` was not compiled `-O2`? Should we generate object
 code for `B` anyway to obey `-O2`? That seems a bit surprising. Should we
 load it interpreted? That seems inconsistent. Or perhaps we should change
 the interpretation of `-fobject-code` in a slightly different direction.
 What if we make `:load *A` guarantee that it loads `A` interpreted whether
 or not `A` has been compiled already and whether or not GHCi was run with
 `-fobject-code`?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13604#comment:44>
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