Give locations of flag warnings/errors

1 files changed, 8 insertions, 7 deletions

diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs
index eea6b52fc2..22f645efd5 100644
--- a/compiler/main/HeaderInfo.hs
+++ b/compiler/main/HeaderInfo.hs
@@ -185,13 +185,14 @@ getOptions' dflags buf filename
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 -- Complain about non-dynamic flags in OPTIONS pragmas
 
-checkProcessArgsResult :: [String] -> FilePath -> IO ()
-checkProcessArgsResult flags filename
-  = do when (notNull flags) (ghcError (ProgramError (
-          showSDoc (hang (text filename <> char ':')
-                      4 (text "unknown flags in  {-# OPTIONS #-} pragma:" <+>
-                          hsep (map text flags)))
-        )))
+checkProcessArgsResult :: [Located String] -> IO ()
+checkProcessArgsResult flags
+  = when (notNull flags) $
+        ghcError $ ProgramError $ showSDoc $ vcat $ map f flags
+    where f (L loc flag)
+              = hang (ppr loc <> char ':') 4
+                     (text "unknown flag in  {-# OPTIONS #-} pragma:" <+>
+                      text flag)
 
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