Add LANGUAGE pragmas to compiler/ source files

In some cases, the layout of the LANGUAGE/OPTIONS_GHC lines has been
reorganized, while following the convention, to

- place `{-# LANGUAGE #-}` pragmas at the top of the source file, before
  any `{-# OPTIONS_GHC #-}`-lines.

- Moreover, if the list of language extensions fit into a single
  `{-# LANGUAGE ... -#}`-line (shorter than 80 characters), keep it on one
  line. Otherwise split into `{-# LANGUAGE ... -#}`-lines for each
  individual language extension. In both cases, try to keep the
  enumeration alphabetically ordered.
  (The latter layout is preferable as it's more diff-friendly)

While at it, this also replaces obsolete `{-# OPTIONS ... #-}` pragma
occurences by `{-# OPTIONS_GHC ... #-}` pragmas.

1 files changed, 31 insertions, 10 deletions

diff --git a/compiler/ghc.cabal.in b/compiler/ghc.cabal.in
index 9dc7826e25..e6f86c97d9 100644
--- a/compiler/ghc.cabal.in
+++ b/compiler/ghc.cabal.in
@@ -54,7 +54,9 @@ Library
                    filepath   >= 1   && < 1.4,
                    Cabal,
                    hpc,
-                   transformers
+                   transformers,
+                   bin-package-db,
+                   hoopl
 
     if flag(stage1) && impl(ghc < 7.5)
         Build-Depends: old-time   >= 1   && < 1.2
@@ -71,13 +73,34 @@ Library
         CPP-Options: -DGHCI
         Include-Dirs: ../rts/dist/build @FFIIncludeDir@
 
-    Build-Depends: bin-package-db
-    Build-Depends: hoopl
-
-    Default-Extensions: CPP, MagicHash, UnboxedTuples
-                TypeSynonymInstances, MultiParamTypeClasses,
-                FlexibleInstances, RankNTypes, ScopedTypeVariables,
-                DeriveDataTypeable, BangPatterns, NondecreasingIndentation
+    Other-Extensions:
+        BangPatterns
+        CPP
+        DataKinds
+        DeriveDataTypeable
+        DeriveFoldable
+        DeriveFunctor
+        DeriveTraversable
+        DisambiguateRecordFields
+        ExplicitForAll
+        FlexibleContexts
+        FlexibleInstances
+        GADTs
+        GeneralizedNewtypeDeriving
+        MagicHash
+        MultiParamTypeClasses
+        NamedFieldPuns
+        NondecreasingIndentation
+        RankNTypes
+        RecordWildCards
+        ScopedTypeVariables
+        StandaloneDeriving
+        Trustworthy
+        TupleSections
+        TypeFamilies
+        TypeSynonymInstances
+        UnboxedTuples
+        UndecidableInstances
 
     Include-Dirs: . parser utils
 
@@ -94,8 +117,6 @@ Library
 
     c-sources:
         parser/cutils.c
-
-    c-sources:
         ghci/keepCAFsForGHCi.c
         cbits/genSym.c