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-rw-r--r--compiler/GHC/Driver/Pipeline.hs8
1 files changed, 6 insertions, 2 deletions
diff --git a/compiler/GHC/Driver/Pipeline.hs b/compiler/GHC/Driver/Pipeline.hs
index b282304a1a..cd8205f6ad 100644
--- a/compiler/GHC/Driver/Pipeline.hs
+++ b/compiler/GHC/Driver/Pipeline.hs
@@ -62,6 +62,7 @@ import GHC.Driver.Errors.Types
import GHC.Driver.Pipeline.Monad
import GHC.Driver.Config.Diagnostic
import GHC.Driver.Phases
+import GHC.Driver.Pipeline.Execute
import GHC.Driver.Pipeline.Phases
import GHC.Driver.Session
import GHC.Driver.Backend
@@ -118,9 +119,9 @@ import Control.Monad
import qualified Control.Monad.Catch as MC (handle)
import Data.Maybe
import Data.Either ( partitionEithers )
+import qualified Data.Set as Set
import Data.Time ( getCurrentTime )
-import GHC.Driver.Pipeline.Execute
-- Simpler type synonym for actions in the pipeline monad
type P m = TPipelineClass TPhase m
@@ -412,7 +413,10 @@ link' logger tmpfs dflags unit_env batch_attempt_linking hpt
home_mod_infos = eltsHpt hpt
-- the packages we depend on
- pkg_deps = concatMap (dep_direct_pkgs . mi_deps . hm_iface) home_mod_infos
+ pkg_deps = Set.toList
+ $ Set.unions
+ $ fmap (dep_direct_pkgs . mi_deps . hm_iface)
+ $ home_mod_infos
-- the linkables to link
linkables = map (expectJust "link".hm_linkable) home_mod_infos