[GHC] #16093: mkPluginUsage: file not found

[GHC]

#16093: mkPluginUsage: file not found
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        Reporter:  lerkok            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      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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Comment (by darchon):

 As a workaround you can run ghci with `-fobject-code`, and for haddock add
 the `--optghc="-fobject-code"` (you won't need the TemplateHaskell
 langauge pragma anymore either).

 Anyhow, this is a regression I introduced when improving/fixing the
 recompilation logic:
 https://github.com/ghc/ghc/commit/52065e95c6df89d0048c6e3f35d6cc26ce8246f9
 So to determine whether we need to recompile a module we need to track its
 "inputs", which includes the plugins the the module was compiled with. We
 decided to use the binary objects, `.so/.a` for packaged plugins, `.o` for
 local plugins, because they can only give false positives to determine
 whether the functionality of the plugin changes (`.hi` files can give
 false negatives).

 I guess I need to rethink how to handle local plugins...

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16093#comment:8>
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