Re: [GHC] #10637: Cannot suppress "Warning: {-# SOURCE #-} unnecessary in import of ‘A’"

15 Jul 2015

      #10637: Cannot suppress "Warning: {-# SOURCE #-} unnecessary in import of  ‘A’"
---------------------------------+-----------------------------------------
        Reporter:  phischu       |                   Owner:
            Type:  bug           |                  Status:  new
        Priority:  normal        |               Milestone:
       Component:  Compiler      |                 Version:  7.10.1
      Resolution:                |                Keywords:
Operating System:  Linux         |            Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |               Test Case:
      Blocked By:                |                Blocking:
 Related Tickets:                |  Differential Revisions:
---------------------------------+-----------------------------------------

Comment (by simonpj):

 Good catch!

 Currently -w simply makes the "set of active warning flags" empty.  But in
 fact there is no flag to control this particular warning (see
 `DynFlags.WarningFlag`).

 So we must choose:
  * Invent a new flag `-fwarn-unnecesary-source-imports", or
  * Re-use an existing flag, such as `-fwarn-unused-imports`.

 I'm inclined to do the latter; it's hardly a hot topic.

 Then
  * Modify `GhcMake.warnUnnecessarySourceImports` to check this flag, and
 do nothing unless it is set.

 This is easy.  Would someone like to do it?

 Simon

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10637#comment:1
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler