Clean out support for old ghcs from cabal files

ghc-parser/ghc-parser.cabal

@@ -16,37 +16,15 @@ build-type:          Simple
 -- extra-source-files:
 cabal-version:       >=1.16
 
--- hs-source-dirs doesn't work well, doesn't take union, so include all src dirs specifically
-extra-source-files:
-  HaskellParser76.y.pp
-  HaskellParser782.y.pp
-  HaskellParser783.y.pp
-  src-7.10/Language/Haskell/GHC/HappyParser.hs
-  src-7.8.2/Language/Haskell/GHC/HappyParser.hs
-  src-7.8.3/Language/Haskell/GHC/HappyParser.hs
-  src-7.6/Language/Haskell/GHC/HappyParser.hs
-
 library
   build-tools:         happy, cpphs
   exposed-modules:     Language.Haskell.GHC.Parser,
                        Language.Haskell.GHC.HappyParser
   -- other-modules:
   -- other-extensions:
-  build-depends:       base                 >=4.6 && < 5,
-                       ghc                  >=7.6 && <8.7
+  build-depends:       base                 >=4.9 && < 5,
+                       ghc                  >=8.0 && <8.7
 
-  if   impl(ghc >= 7.6) && impl(ghc < 7.8)
-    hs-source-dirs:      generic-src src-7.6
-  else
-    if impl(ghc >= 7.8) && impl(ghc < 7.8.3)
-      hs-source-dirs:    generic-src src-7.8.2
-    else
-      if impl(ghc < 7.10)
-        hs-source-dirs:    generic-src src-7.8.3
-      else
-        if impl(ghc < 8.0)
-          hs-source-dirs:    generic-src src-7.10
-        else
   if impl(ghc >= 8.0) && impl(ghc < 8.4)
     hs-source-dirs:    generic-src src-8.0
   else

ghc-parser/src-7.10/Language/Haskell/GHC/HappyParser.hs

-module Language.Haskell.GHC.HappyParser
-    ( fullStatement
-    , fullImport
-    , fullDeclaration
-    , fullExpression
-    , fullTypeSignature
-    , fullModule
-    ) where
-
-import Parser
-import SrcLoc
-
--- compiler/hsSyn
-import HsSyn
-
--- compiler/utils
-import OrdList
-
--- compiler/parser
-import RdrHsSyn
-import Lexer
-
--- compiler/basicTypes
-import RdrName
-
-fullStatement :: P (Maybe (LStmt RdrName (LHsExpr RdrName)))
-fullStatement = parseStmt
-
-fullImport :: P (LImportDecl RdrName)
-fullImport = parseImport
-
-fullDeclaration :: P (OrdList (LHsDecl RdrName))
-fullDeclaration = parseDeclaration
-
-fullExpression :: P (LHsExpr RdrName)
-fullExpression = parseExpression
-
-fullTypeSignature :: P (Located (OrdList (LHsDecl RdrName)))
-fullTypeSignature = parseTypeSignature
-
-fullModule :: P (Located (HsModule RdrName))
-fullModule = parseModule

ihaskell-display/ihaskell-aeson/ihaskell-aeson.cabal

@@ -53,7 +53,7 @@ library
   -- other-modules:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        here,
                        text,
                        bytestring,

ihaskell-display/ihaskell-blaze/ihaskell-blaze.cabal

@@ -57,7 +57,7 @@ library
   -- other-modules:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        blaze-html >= 0.6,
                        blaze-markup >= 0.5,
                        ihaskell >= 0.5

ihaskell-display/ihaskell-charts/ihaskell-charts.cabal

@@ -54,7 +54,7 @@ library
   -- other-modules:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        bytestring,
                        data-default-class,
                        directory,

ihaskell-display/ihaskell-diagrams/ihaskell-diagrams.cabal

@@ -55,7 +55,7 @@ library
                        IHaskell.Display.Diagrams.ImgSize
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        text,
                        bytestring,
                        directory,

ihaskell-display/ihaskell-gnuplot/ihaskell-gnuplot.cabal

@@ -54,7 +54,7 @@ library
   -- other-modules:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        bytestring,
                        gnuplot >= 0.5.4,
                        ihaskell >= 0.6.2

ihaskell-display/ihaskell-hatex/ihaskell-hatex.cabal

@@ -14,7 +14,7 @@ cabal-version:       >=1.16
 
 library
   exposed-modules:     IHaskell.Display.Hatex
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        text,
                        HaTeX >= 3.9,
                        ihaskell >= 0.5

ihaskell-display/ihaskell-juicypixels/ihaskell-juicypixels.cabal

@@ -60,7 +60,7 @@ library
   -- other-modules:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        bytestring,
                        directory,
                        JuicyPixels >= 3.1.3,

ihaskell-display/ihaskell-magic/ihaskell-magic.cabal

@@ -57,7 +57,7 @@ library
   -- other-modules:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        magic >= 1.0.8,
                        text,
                        bytestring,

ihaskell-display/ihaskell-plot/ihaskell-plot.cabal

@@ -54,7 +54,7 @@ library
   -- other-modules:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        plot,
                        bytestring,
                        hmatrix >= 0.10,

ihaskell-display/ihaskell-static-canvas/ihaskell-static-canvas.cabal

@@ -60,7 +60,7 @@ library
   -- other-extensions:
 
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.7,
+  build-depends:       base >=4.9,
                        ihaskell,
                        static-canvas,
                        text

ihaskell-display/ihaskell-widgets/ihaskell-widgets.cabal

@@ -91,10 +91,8 @@ library
   -- LANGUAGE extensions used by modules in this package.
   -- other-extensions:
 
-  -- Other library packages from which modules are imported.
-  -- singletons 2.* require ghc 7.10.2
   build-depends:       aeson >=0.7
-                     , base >=4.7 && <5
+                     , base >=4.9 && <5
                      , containers >= 0.5
                      , ipython-kernel >= 0.6.1.2
                      , text >= 0.11
@@ -104,30 +102,13 @@ library
                      , scientific -any
                      , unix -any
                      , ihaskell >= 0.6.4.1
-  if impl(ghc >= 7.10.2)
-    build-depends:       singletons >= 0.9.0
-  if impl(ghc == 7.10.1)
-    build-depends:       singletons >= 0.9.0 && <2.0
-                       , nats -any
-  if impl(ghc < 7.10.1)
-    build-depends:       singletons >= 0.9.0 && <2.0
-                       , nats <1.1
+
+					 -- The singletons package version is locked to the compiler
+					 -- so let cabal choose the right one.
+                     , singletons -any
 
   -- Directories containing source files.
   hs-source-dirs:      src
 
   -- Base language which the package is written in.
   default-language:    Haskell2010
-  
-  -- Deal with small -fcontext-stack on ghc-7.8.
-  -- Default values:
-  --   ghc-7.6.*  = 200
-  --   ghc-7.8.*  = 20   -- Too small for vinyl & singletons
-  --   ghc-7.10.* = 100
-  if impl(ghc == 7.8.*)
-    ghc-options:       -fcontext-stack=100
-
-  -- compile without optimizations not to run out of memory on travis
-  if impl(ghc == 7.10.*)
-    ghc-options:       -O0
-

ihaskell.cabal

@@ -134,10 +134,10 @@ executable ihaskell
   default-language:    Haskell2010
   build-depends:
                        ihaskell -any,
-                       base                 >=4.6 && < 4.13,
+                       base                 >=4.9 && < 4.13,
                        text                 >=0.11,
                        transformers         -any,
-                       ghc                  >=7.6 || < 7.11,
+                       ghc                  >=8.0 && < 8.7,
                        process              >=1.1,
                        aeson                >=0.7,
                        bytestring           >=0.10,
@@ -147,9 +147,6 @@ executable ihaskell
                        directory            -any,
                        ipython-kernel       >=0.7
 
-  if flag(binPkgDb)
-    build-depends:       bin-package-db
-
 Test-Suite hspec
     Type: exitcode-stdio-1.0
     Ghc-Options: -threaded

ipython-kernel/ipython-kernel.cabal

@@ -34,7 +34,7 @@ library
   other-extensions:    OverloadedStrings
   hs-source-dirs:      src
   default-language:    Haskell2010
-  build-depends:       base                 >=4.6 && <5,
+  build-depends:       base                 >=4.9 && <5,
                        aeson           ,
                        bytestring      ,
                        cereal          ,