-w should turn off /all/ options, not just the -Wall ones

diff --git a/compiler/main/DynFlags.hs b/compiler/main/DynFlags.hs
index 28943ab..cbed799 100644 (file)
--- a/compiler/main/DynFlags.hs
+++ b/compiler/main/DynFlags.hs
@@ -650,6 +650,16 @@ minusWallOpts
        Opt_WarnOrphans
       ]
 
+-- minuswRemovesOpts should be every warning option
+minuswRemovesOpts
+    = minusWallOpts ++
+      [Opt_WarnImplicitPrelude,
+       Opt_WarnIncompletePatternsRecUpd,
+       Opt_WarnSimplePatterns,
+       Opt_WarnMonomorphism,
+       Opt_WarnTabs
+      ]
+
 -- -----------------------------------------------------------------------------
 -- CoreToDo:  abstraction of core-to-core passes to run.
 
@@ -1035,7 +1045,7 @@ dynamic_flags = [
   ,  ( "Werror"                , NoArg (setDynFlag         Opt_WarnIsError) )
   ,  ( "Wall"          , NoArg (mapM_ setDynFlag   minusWallOpts) )
   ,  ( "Wnot"          , NoArg (mapM_ unSetDynFlag minusWallOpts) ) /* DEPREC */
-  ,  ( "w"             , NoArg (mapM_ unSetDynFlag minusWallOpts) )
+  ,  ( "w"             , NoArg (mapM_ unSetDynFlag minuswRemovesOpts) )
 
        ------ Optimisation flags ------------------------------------------
   ,  ( "O"     , NoArg (upd (setOptLevel 1)))