[GHC] #13129: Warn about home module not listed on command line

[GHC]

#13129: Warn about home module not listed on command line
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        Reporter:  Yuras             |                Owner:  Yuras
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      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:D2977
       Wiki Page:                    |
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Changes (by Yuras):

 * owner:   => Yuras


@@ -2,1 +2,1 @@
- https://github.com/haskell/cabal/pull/1455
+ https://github.com/haskell/cabal/issues/1746

New description:

 It is an attempt to fix this cabal issue:
 https://github.com/haskell/cabal/issues/1746

 Basically, when user fails to list all modules in `exposed-modules` or
 `other-modules`, cabal produces broken package.

 The idea of the fix is to teach GHC to warn about home modules (not from
 an other package), that are not explicitly listed in command line.

 Option name `-Wmissing-home-modules` is a subject for bikeshedding.

--

Comment:

 Oops, the link was wrong, sorry.

 The problem: when user fail to list a module in cabal file, then the
 package successfully builds, but the corresponding `.o` file is not
 included into the library. As a result, the package is unusable.

 One can argue that it is Cabal issue, and GHC has nothing to do with that.
 But fixing it on Cabal side is relatively hard.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13129#comment:4>
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