-errorsFound :: Messages -> Bool
-errorsFound (warns, errs) = not (isEmptyBag errs)
-
-warningsFound :: Messages -> Bool
-warningsFound (warns, errs) = not (isEmptyBag warns)
+errorsFound :: DynFlags -> Messages -> Bool
+-- The dyn-flags are used to see if the user has specified
+-- -Werorr, which says that warnings should be fatal
+errorsFound dflags (warns, errs)
+ | dopt Opt_WarnIsError dflags = not (isEmptyBag errs) || not (isEmptyBag warns)
+ | otherwise = not (isEmptyBag errs)