Remove support for versions of GHC prior to 6.12, fixes #3108.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Author: ezyang

Cabal/Distribution/Simple/GHC.hs

@@ -111,7 +111,7 @@ configure verbosity hcPath hcPkgPath conf0 = do
 
   (ghcProg, ghcVersion, conf1) <-
     requireProgramVersion verbosity ghcProgram
-      (orLaterVersion (Version [6,4] []))
+      (orLaterVersion (Version [6,11] []))
       (userMaybeSpecifyPath "ghc" hcPath conf0)
   let implInfo = ghcVersionImplInfo ghcVersion
 

Cabal/Distribution/Simple/GHC/ImplInfo.hs

@@ -31,17 +31,7 @@ import Distribution.Version
 -}
 
 data GhcImplInfo = GhcImplInfo
-  { hasCcOdirBug         :: Bool -- ^ bug in -odir handling for C compilations.
-  , flagInfoLanguages    :: Bool -- ^ --info and --supported-languages flags
-  , fakeRecordPuns       :: Bool -- ^ use -XRecordPuns for NamedFieldPuns
-  , flagStubdir          :: Bool -- ^ -stubdir flag supported
-  , flagOutputDir        :: Bool -- ^ -outputdir flag supported
-  , noExtInSplitSuffix   :: Bool -- ^ split-obj suffix does not contain p_o ext
-  , flagFfiIncludes      :: Bool -- ^ -#include on command line for FFI includes
-  , flagBuildingCabalPkg :: Bool -- ^ -fbuilding-cabal-package flag supported
-  , flagPackageId        :: Bool -- ^ -package-id / -package flags supported
-  , separateGccMingw     :: Bool -- ^ mingw and gcc are in separate directories
-  , supportsHaskell2010  :: Bool -- ^ -XHaskell2010 and -XHaskell98 flags
+  { supportsHaskell2010  :: Bool -- ^ -XHaskell2010 and -XHaskell98 flags
   , reportsNoExt         :: Bool -- ^ --supported-languages gives Ext and NoExt
   , alwaysNondecIndent   :: Bool -- ^ NondecreasingIndentation is always on
   , flagGhciScript       :: Bool -- ^ -ghci-script flag supported
@@ -65,17 +55,7 @@ getImplInfo comp =
 
 ghcVersionImplInfo :: Version -> GhcImplInfo
 ghcVersionImplInfo (Version v _) = GhcImplInfo
-  { hasCcOdirBug         = v <  [6,4,1]
-  , flagInfoLanguages    = v >= [6,7]
-  , fakeRecordPuns       = v >= [6,8] && v < [6,10]
-  , flagStubdir          = v >= [6,8]
-  , flagOutputDir        = v >= [6,10]
-  , noExtInSplitSuffix   = v <  [6,11]
-  , flagFfiIncludes      = v <  [6,11]
-  , flagBuildingCabalPkg = v >= [6,11]
-  , flagPackageId        = v >  [6,11]
-  , separateGccMingw     = v <  [6,12]
-  , supportsHaskell2010  = v >= [7]
+  { supportsHaskell2010  = v >= [7]
   , reportsNoExt         = v >= [7]
   , alwaysNondecIndent   = v <  [7,1]
   , flagGhciScript       = v >= [7,2]
@@ -86,17 +66,7 @@ ghcVersionImplInfo (Version v _) = GhcImplInfo
 
 ghcjsVersionImplInfo :: Version -> Version -> GhcImplInfo
 ghcjsVersionImplInfo _ghcjsVer _ghcVer = GhcImplInfo
-  { hasCcOdirBug         = False
-  , flagInfoLanguages    = True
-  , fakeRecordPuns       = False
-  , flagStubdir          = True
-  , flagOutputDir        = True
-  , noExtInSplitSuffix   = False
-  , flagFfiIncludes      = False
-  , flagBuildingCabalPkg = True
-  , flagPackageId        = True
-  , separateGccMingw     = False
-  , supportsHaskell2010  = True
+  { supportsHaskell2010  = True
   , reportsNoExt         = True
   , alwaysNondecIndent   = False
   , flagGhciScript       = True

Cabal/Distribution/Simple/GHC/Internal.hs

@@ -71,7 +71,7 @@ configureToolchain :: GhcImplInfo
                    -> M.Map String String
                    -> ProgramConfiguration
                    -> ProgramConfiguration
-configureToolchain implInfo ghcProg ghcInfo =
+configureToolchain _implInfo ghcProg ghcInfo =
     addKnownProgram gccProgram {
       programFindLocation = findProg gccProgram extraGccPath,
       programPostConf     = configureGcc
@@ -90,8 +90,6 @@ configureToolchain implInfo ghcProg ghcInfo =
     compilerDir = takeDirectory (programPath ghcProg)
     baseDir     = takeDirectory compilerDir
     mingwBinDir = baseDir </> "mingw" </> "bin"
-    libDir      = baseDir </> "gcc-lib"
-    includeDir  = baseDir </> "include" </> "mingw"
     isWindows   = case buildOS of Windows -> True; _ -> False
     binPrefix   = ""
 
@@ -108,9 +106,7 @@ configureToolchain implInfo ghcProg ghcInfo =
 
     -- on Windows finding and configuring ghc's gcc & binutils is a bit special
     (windowsExtraGccDir, windowsExtraLdDir,
-     windowsExtraArDir, windowsExtraStripDir)
-      | separateGccMingw implInfo = (baseDir, libDir, libDir, libDir)
-      | otherwise                 = -- GHC >= 6.12
+     windowsExtraArDir, windowsExtraStripDir) =
           let b = mingwBinDir </> binPrefix
           in  (b, b, b, b)
 
@@ -148,28 +144,12 @@ configureToolchain implInfo ghcProg ghcInfo =
             | otherwise -> tokenizeQuotedWords flags
 
     configureGcc :: Verbosity -> ConfiguredProgram -> IO ConfiguredProgram
-    configureGcc v gccProg = do
-      gccProg' <- configureGcc' v gccProg
-      return gccProg' {
-        programDefaultArgs = programDefaultArgs gccProg'
+    configureGcc _v gccProg = do
+      return gccProg {
+        programDefaultArgs = programDefaultArgs gccProg
                              ++ ccFlags ++ gccLinkerFlags
       }
 
-    configureGcc' :: Verbosity -> ConfiguredProgram -> IO ConfiguredProgram
-    configureGcc'
-      | isWindows = \_ gccProg -> case programLocation gccProg of
-          -- if it's found on system then it means we're using the result
-          -- of programFindLocation above rather than a user-supplied path
-          -- Pre GHC 6.12, that meant we should add these flags to tell
-          -- ghc's gcc where it lives and thus where gcc can find its
-          -- various files:
-          FoundOnSystem {}
-           | separateGccMingw implInfo ->
-               return gccProg { programDefaultArgs = ["-B" ++ libDir,
-                                                      "-I" ++ includeDir] }
-          _ -> return gccProg
-      | otherwise = \_ gccProg -> return gccProg
-
     configureLd :: Verbosity -> ConfiguredProgram -> IO ConfiguredProgram
     configureLd v ldProg = do
       ldProg' <- configureLd' v ldProg
@@ -209,8 +189,7 @@ getLanguages _ implInfo _
 
 getGhcInfo :: Verbosity -> GhcImplInfo -> ConfiguredProgram
            -> IO [(String, String)]
-getGhcInfo verbosity implInfo ghcProg
-  | flagInfoLanguages implInfo = do
+getGhcInfo verbosity _implInfo ghcProg = do
       xs <- getProgramOutput verbosity (suppressOverrideArgs ghcProg)
                  ["--info"]
       case reads xs of
@@ -219,13 +198,10 @@ getGhcInfo verbosity implInfo ghcProg
               return i
         _ ->
           die "Can't parse --info output of GHC"
-  | otherwise =
-      return []
 
 getExtensions :: Verbosity -> GhcImplInfo -> ConfiguredProgram
               -> IO [(Extension, String)]
-getExtensions verbosity implInfo ghcProg
-  | flagInfoLanguages implInfo = do
+getExtensions verbosity implInfo ghcProg = do
     str <- getProgramOutput verbosity (suppressOverrideArgs ghcProg)
               ["--supported-languages"]
     let extStrs = if reportsNoExt implInfo
@@ -241,88 +217,21 @@ getExtensions verbosity implInfo ghcProg
                        ]
     let extensions0 = [ (ext, "-X" ++ display ext)
                       | Just ext <- map simpleParse extStrs ]
-        extensions1 = if fakeRecordPuns implInfo
-                      then -- ghc-6.8 introduced RecordPuns however it
-                           -- should have been NamedFieldPuns. We now
-                           -- encourage packages to use NamedFieldPuns
-                           -- so for compatibility we fake support for
-                           -- it in ghc-6.8 by making it an alias for
-                           -- the old RecordPuns extension.
-                           (EnableExtension  NamedFieldPuns, "-XRecordPuns") :
-                           (DisableExtension NamedFieldPuns, "-XNoRecordPuns") :
-                           extensions0
-                      else extensions0
-        extensions2 = if alwaysNondecIndent implInfo
+        extensions1 = if alwaysNondecIndent implInfo
                       then -- ghc-7.2 split NondecreasingIndentation off
                            -- into a proper extension. Before that it
                            -- was always on.
                            (EnableExtension  NondecreasingIndentation, "") :
                            (DisableExtension NondecreasingIndentation, "") :
-                           extensions1
-                      else extensions1
-    return extensions2
-
-  | otherwise = return oldLanguageExtensions
-
--- | For GHC 6.6.x and earlier, the mapping from supported extensions to flags
-oldLanguageExtensions :: [(Extension, String)]
-oldLanguageExtensions =
-    let doFlag (f, (enable, disable)) = [(EnableExtension  f, enable),
-                                         (DisableExtension f, disable)]
-        fglasgowExts = ("-fglasgow-exts",
-                        "") -- This is wrong, but we don't want to turn
-                            -- all the extensions off when asked to just
-                            -- turn one off
-        fFlag flag = ("-f" ++ flag, "-fno-" ++ flag)
-    in concatMap doFlag
-    [(OverlappingInstances       , fFlag "allow-overlapping-instances")
-    ,(TypeSynonymInstances       , fglasgowExts)
-    ,(TemplateHaskell            , fFlag "th")
-    ,(ForeignFunctionInterface   , fFlag "ffi")
-    ,(MonomorphismRestriction    , fFlag "monomorphism-restriction")
-    ,(MonoPatBinds               , fFlag "mono-pat-binds")
-    ,(UndecidableInstances       , fFlag "allow-undecidable-instances")
-    ,(IncoherentInstances        , fFlag "allow-incoherent-instances")
-    ,(Arrows                     , fFlag "arrows")
-    ,(Generics                   , fFlag "generics")
-    ,(ImplicitPrelude            , fFlag "implicit-prelude")
-    ,(ImplicitParams             , fFlag "implicit-params")
-    ,(CPP                        , ("-cpp", ""{- Wrong -}))
-    ,(BangPatterns               , fFlag "bang-patterns")
-    ,(KindSignatures             , fglasgowExts)
-    ,(RecursiveDo                , fglasgowExts)
-    ,(ParallelListComp           , fglasgowExts)
-    ,(MultiParamTypeClasses      , fglasgowExts)
-    ,(FunctionalDependencies     , fglasgowExts)
-    ,(Rank2Types                 , fglasgowExts)
-    ,(RankNTypes                 , fglasgowExts)
-    ,(PolymorphicComponents      , fglasgowExts)
-    ,(ExistentialQuantification  , fglasgowExts)
-    ,(ScopedTypeVariables        , fFlag "scoped-type-variables")
-    ,(FlexibleContexts           , fglasgowExts)
-    ,(FlexibleInstances          , fglasgowExts)
-    ,(EmptyDataDecls             , fglasgowExts)
-    ,(PatternGuards              , fglasgowExts)
-    ,(GeneralizedNewtypeDeriving , fglasgowExts)
-    ,(MagicHash                  , fglasgowExts)
-    ,(UnicodeSyntax              , fglasgowExts)
-    ,(PatternSignatures          , fglasgowExts)
-    ,(UnliftedFFITypes           , fglasgowExts)
-    ,(LiberalTypeSynonyms        , fglasgowExts)
-    ,(TypeOperators              , fglasgowExts)
-    ,(GADTs                      , fglasgowExts)
-    ,(RelaxedPolyRec             , fglasgowExts)
-    ,(ExtendedDefaultRules       , fFlag "extended-default-rules")
-    ,(UnboxedTuples              , fglasgowExts)
-    ,(DeriveDataTypeable         , fglasgowExts)
-    ,(ConstrainedClassMethods    , fglasgowExts)
-    ]
+                           extensions0
+                      else extensions0
+    return extensions1
 
 componentCcGhcOptions :: Verbosity -> GhcImplInfo -> LocalBuildInfo
                       -> BuildInfo -> ComponentLocalBuildInfo
                       -> FilePath -> FilePath
                       -> GhcOptions
-componentCcGhcOptions verbosity implInfo lbi bi clbi pref filename =
+componentCcGhcOptions verbosity _implInfo lbi bi clbi odir filename =
     mempty {
       ghcOptVerbosity      = toFlag verbosity,
       ghcOptMode           = toFlag GhcModeCompile,
@@ -344,10 +253,6 @@ componentCcGhcOptions verbosity implInfo lbi bi clbi pref filename =
                                   PD.ccOptions bi,
       ghcOptObjDir         = toFlag odir
     }
-  where
-    odir | hasCcOdirBug implInfo = pref </> takeDirectory filename
-         | otherwise             = pref
-         -- ghc 6.4.0 had a bug in -odir handling for C compilations.
 
 componentGhcOptions :: Verbosity -> LocalBuildInfo
                     -> BuildInfo -> ComponentLocalBuildInfo -> FilePath
@@ -422,11 +327,9 @@ ghcLookupProperty prop comp =
 -- Module_split directory for each module.
 getHaskellObjects :: GhcImplInfo -> Library -> LocalBuildInfo
                   -> FilePath -> String -> Bool -> IO [FilePath]
-getHaskellObjects implInfo lib lbi pref wanted_obj_ext allow_split_objs
+getHaskellObjects _implInfo lib lbi pref wanted_obj_ext allow_split_objs
   | splitObjs lbi && allow_split_objs = do
-        let splitSuffix = if   noExtInSplitSuffix implInfo
-                          then "_split"
-                          else "_" ++ wanted_obj_ext ++ "_split"
+        let splitSuffix = "_" ++ wanted_obj_ext ++ "_split"
             dirs = [ pref </> (ModuleName.toFilePath x ++ splitSuffix)
                    | x <- libModules lib ]
         objss <- mapM getDirectoryContents dirs
@@ -439,10 +342,11 @@ getHaskellObjects implInfo lib lbi pref wanted_obj_ext allow_split_objs
         return [ pref </> ModuleName.toFilePath x <.> wanted_obj_ext
                | x <- libModules lib ]
 
+-- TODO: rework me
 mkGhcOptPackages :: ComponentLocalBuildInfo
-                 -> [(UnitId, PackageId, ModuleRenaming)]
+                 -> [(UnitId, ModuleRenaming)]
 mkGhcOptPackages clbi =
-  map (\(i,p) -> (i,p,lookupRenaming p (componentPackageRenaming clbi)))
+  map (\(i,p) -> (i,lookupRenaming p (componentPackageRenaming clbi)))
       (componentPackageDeps clbi)
 
 substTopDir :: FilePath -> InstalledPackageInfo -> InstalledPackageInfo

Cabal/Distribution/Simple/Program/GHC.hs

@@ -79,11 +79,9 @@ data GhcOptions = GhcOptions {
   -- | GHC package databases to use, the @ghc -package-conf@ flag.
   ghcOptPackageDBs    :: PackageDBStack,
 
-  -- | The GHC packages to use. For compatability with old and new ghc, this
-  -- requires both the short and long form of the package id;
-  -- the @ghc -package@ or @ghc -package-id@ flags.
+  -- | The GHC packages to use, the @ghc -package-id@ flags.
   ghcOptPackages      ::
-    NubListR (UnitId, PackageId, ModuleRenaming),
+    NubListR (UnitId, ModuleRenaming),
 
   -- | Start with a clean package set; the @ghc -hide-all-packages@ flag
   ghcOptHideAllPackages :: Flag Bool,
@@ -269,8 +267,7 @@ renderGhcOptions comp opts
 
   , maybe [] verbosityOpts (flagToMaybe (ghcOptVerbosity opts))
 
-  , [ "-fbuilding-cabal-package" | flagBool ghcOptCabal
-                                 , flagBuildingCabalPkg implInfo ]
+  , [ "-fbuilding-cabal-package" | flagBool ghcOptCabal ]
 
   ----------------
   -- Compilation
@@ -332,12 +329,10 @@ renderGhcOptions comp opts
   , concat [ ["-hisuf",   suf] | suf <- flag ghcOptHiSuffix  ]
   , concat [ ["-dynosuf", suf] | suf <- flag ghcOptDynObjSuffix ]
   , concat [ ["-dynhisuf",suf] | suf <- flag ghcOptDynHiSuffix  ]
-  , concat [ ["-outputdir", dir] | dir <- flag ghcOptOutputDir
-                                 , flagOutputDir implInfo ]
+  , concat [ ["-outputdir", dir] | dir <- flag ghcOptOutputDir ]
   , concat [ ["-odir",    dir] | dir <- flag ghcOptObjDir ]
   , concat [ ["-hidir",   dir] | dir <- flag ghcOptHiDir  ]
-  , concat [ ["-stubdir", dir] | dir <- flag ghcOptStubDir
-                               , flagStubdir implInfo ]
+  , concat [ ["-stubdir", dir] | dir <- flag ghcOptStubDir ]
 
   -----------------------
   -- Source search path
@@ -352,8 +347,6 @@ renderGhcOptions comp opts
   , [ "-optP" ++ opt | opt <- flags ghcOptCppOptions ]
   , concat [ [ "-optP-include", "-optP" ++ inc]
            | inc <- flags ghcOptCppIncludes ]
-  , [ "-#include \"" ++ inc ++ "\""
-    | inc <- flags ghcOptFfiIncludes, flagFfiIncludes implInfo ]
   , [ "-optc" ++ opt | opt <- flags ghcOptCcOptions ]
 
   -----------------
@@ -383,13 +376,10 @@ renderGhcOptions comp opts
 
   , packageDbArgs implInfo (ghcOptPackageDBs opts)
 
-  , concat $ if flagPackageId implInfo
-      then let space "" = ""
-               space xs = ' ' : xs
-           in [ ["-package-id", display ipkgid ++ space (display rns)]
-              | (ipkgid,_,rns) <- flags ghcOptPackages ]
-      else [ ["-package",    display  pkgid]
-           | (_,pkgid,_)  <- flags ghcOptPackages ]
+  , concat $ let space "" = ""
+                 space xs = ' ' : xs
+             in [ ["-package-id", display ipkgid ++ space (display rns)]
+                | (ipkgid,rns) <- flags ghcOptPackages ]
 
   ----------------------------
   -- Language and extensions

cabal-install/Distribution/Client/SetupWrapper.hs

@@ -614,7 +614,7 @@ externalSetupMethod verbosity options pkg bt mkargs = do
           selectedDeps | useDependenciesExclusive options'
                                    = useDependencies options'
                        | otherwise = useDependencies options' ++ cabalDep
-          addRenaming (ipid, pid) = (ipid, pid, defaultRenaming)
+          addRenaming (ipid, _) = (ipid, defaultRenaming)
           cppMacrosFile = setupDir </> "setup_macros.h"
           ghcOptions = mempty {
               ghcOptVerbosity       = Flag verbosity