[GHC] #11244: Compiler plugins should not have visibility controlled by -package

[GHC]

#11244: Compiler plugins should not have visibility controlled by -package
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        Reporter:  ezyang            |                Owner:  ezyang
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1661
       Wiki Page:                    |
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Comment (by Edward Z. Yang <ezyang@…>):

 In [changeset:"1faf1fcaebb2871f8085b01d0c6d19eec11dc808/ghc" 1faf1fc/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1faf1fcaebb2871f8085b01d0c6d19eec11dc808"
 Implement -hide-all-plugin-packages and -plugin-package(-id), fixing
 #11244

 Summary:
 The basic idea is that we have a new set of "exposed modules"
 which are /only/ used for plugins, i.e. -fplugin Foo and
 --frontend Foo.  You can interact with this namespace
 using the flags -plugin-package-id and -plugin-package.
 By default, this namespace contains all modules in the
 user namespace (as before), but you can toggle that using
 -hide-all-plugin-packages.

 There is one nasty hack: GhcMake respects -fplugin in
 GHC_OPTIONS to make local plugins work correctly.  It also
 bails out of you have an import of a module which doesn't
 exist locally or in the package database.  The upshot is
 that we need to be sure to check in the plugin modules
 too, so we don't give a spurious failure when a plugin
 is in the plugin namespace but not the main namespace.
 A better way to fix this would be to distinguish between
 plugin and normal dependencies in ModSummary.

 I cheated a little and tweaked a few existing plugins
 tests to exercise the new code paths.

 TODO: Documentation

 Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>

 Test Plan: validate

 Reviewers: bgamari, austin, simonpj, duncan

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1661

 GHC Trac Issues: #11244
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11244#comment:6>
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