Also deduplicate library directory arguments.

e88ab5fb · Patrick Chilton · 3d9be43b · e88ab5fb
Commit e88ab5fb authored Nov 12, 2016 by Patrick Chilton
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Cabal/Distribution/Simple/Configure.hs Cabal/Distribution/Simple/Configure.hs +4 -2

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--- a/Cabal/Distribution/Simple/Configure.hs
+++ b/Cabal/Distribution/Simple/Configure.hs
@@ -1660,8 +1660,10 @@ checkForeignDeps pkg lbi verbosity = do
        commonLdArgs  = [ "-L" ++ dir | dir <- collectField PD.extraLibDirs ]
                     ++ collectField PD.ldOptions
                     ++ [ "-L" ++ dir
-                        | dep <- deps
-                        , dir <- Installed.libraryDirs dep ]
+                        | dir <- ordNub [ dir
+                                        | dep <- deps
+                                        , dir <- Installed.libraryDirs dep ]
+                        ]
                     --TODO: do we also need dependent packages' ld options?
        makeLdArgs libs = [ "-l"++lib | lib <- libs ] ++ commonLdArgs