compiler: introduce custom "GhcPrelude" Prelude

This switches the compiler/ component to get compiled with
-XNoImplicitPrelude and a `import GhcPrelude` is inserted in all
modules.

This is motivated by the upcoming "Prelude" re-export of
`Semigroup((<>))` which would cause lots of name clashes in every
modulewhich imports also `Outputable`

Reviewers: austin, goldfire, bgamari, alanz, simonmar

Reviewed By: bgamari

Subscribers: goldfire, rwbarton, thomie, mpickering, bgamari

Differential Revision: https://phabricator.haskell.org/D3989

9 files changed, 18 insertions, 0 deletions

diff --git a/compiler/nativeGen/RegAlloc/Graph/ArchBase.hs b/compiler/nativeGen/RegAlloc/Graph/ArchBase.hs
index 6771e4ecb9..634e61cb13 100644
--- a/compiler/nativeGen/RegAlloc/Graph/ArchBase.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/ArchBase.hs
@@ -21,6 +21,8 @@ module RegAlloc.Graph.ArchBase (
         bound,
         squeese
 ) where
+import GhcPrelude
+
 import UniqSet
 import UniqFM
 import Unique
diff --git a/compiler/nativeGen/RegAlloc/Graph/ArchX86.hs b/compiler/nativeGen/RegAlloc/Graph/ArchX86.hs
index 9873118dcf..0472e4cf09 100644
--- a/compiler/nativeGen/RegAlloc/Graph/ArchX86.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/ArchX86.hs
@@ -15,6 +15,8 @@ module RegAlloc.Graph.ArchX86 (
         squeese,
 ) where
 
+import GhcPrelude
+
 import RegAlloc.Graph.ArchBase  (Reg(..), RegSub(..), RegClass(..))
 import UniqSet
 
diff --git a/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs b/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs
index 832df2334e..0f5cf2dfd8 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs
@@ -3,6 +3,8 @@ module RegAlloc.Graph.Coalesce (
         regCoalesce,
         slurpJoinMovs
 ) where
+import GhcPrelude
+
 import RegAlloc.Liveness
 import Instruction
 import Reg
diff --git a/compiler/nativeGen/RegAlloc/Graph/Main.hs b/compiler/nativeGen/RegAlloc/Graph/Main.hs
index 08538453f7..a4d1841c93 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Main.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Main.hs
@@ -4,6 +4,8 @@
 module RegAlloc.Graph.Main (
         regAlloc
 ) where
+import GhcPrelude
+
 import qualified GraphColor as Color
 import RegAlloc.Liveness
 import RegAlloc.Graph.Spill
diff --git a/compiler/nativeGen/RegAlloc/Graph/Spill.hs b/compiler/nativeGen/RegAlloc/Graph/Spill.hs
index b86b143f59..02da824cfe 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Spill.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Spill.hs
@@ -7,6 +7,8 @@ module RegAlloc.Graph.Spill (
         SpillStats(..),
         accSpillSL
 ) where
+import GhcPrelude
+
 import RegAlloc.Liveness
 import Instruction
 import Reg
diff --git a/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs b/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs
index faef4037c2..50001d7334 100644
--- a/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs
@@ -28,6 +28,8 @@
 module RegAlloc.Graph.SpillClean (
         cleanSpills
 ) where
+import GhcPrelude
+
 import RegAlloc.Liveness
 import Instruction
 import Reg
diff --git a/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs b/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs
index 9811f1a64b..f603b609df 100644
--- a/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs
@@ -13,6 +13,8 @@ module RegAlloc.Graph.SpillCost (
 
         lifeMapFromSpillCostInfo
 ) where
+import GhcPrelude
+
 import RegAlloc.Liveness
 import Instruction
 import RegClass
diff --git a/compiler/nativeGen/RegAlloc/Graph/Stats.hs b/compiler/nativeGen/RegAlloc/Graph/Stats.hs
index 71956025b0..e3ff226710 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Stats.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Stats.hs
@@ -16,6 +16,8 @@ module RegAlloc.Graph.Stats (
 
 #include "nativeGen/NCG.h"
 
+import GhcPrelude
+
 import qualified GraphColor as Color
 import RegAlloc.Liveness
 import RegAlloc.Graph.Spill
diff --git a/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs b/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs
index 204de846ae..7774985dce 100644
--- a/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs
@@ -8,6 +8,8 @@ where
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import RegClass
 import Reg