GitLab

Cheng Shao pushed to branch wip/14554-wasm-fix at Glasgow Haskell Compiler / GHC

WARNING: The push did not contain any new commits, but force pushed to delete the commits and changes below.

Deleted commits:

c5f031f3

by Rodrigo Mesquita at 2025-08-23T19:21:31+02:00

Read Toolchain.Target files rather than 'settings'

This commit makes GHC read `lib/targets/default.target`, a file with a
serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`.

Moreover, it removes all the now-redundant entries from `lib/settings`
that are configured as part of a `Target` but were being written into
`settings`.

This makes it easier to support multiple targets from the same compiler
(aka runtime retargetability). `ghc-toolchain` can be re-run many times
standalone to produce a `Target` description for different targets, and,
in the future, GHC will be able to pick at runtime amongst different
`Target` files.

This commit only makes it read the default `Target` configured in-tree
or configured when installing the bindist.

The remaining bits of `settings` need to be moved to `Target` in follow
up commits, but ultimately they all should be moved since they are
per-target relevant.

Fixes #24212

On Windows, the constant overhead of parsing a slightly more complex
data structure causes some small-allocation tests to wiggle around 1 to
2 extra MB (1-2% in these cases).

-------------------------
Metric Increase:
    MultiLayerModulesTH_OneShot
    T10421
    T10547
    T12234
    T12425
    T13035
    T18140
    T18923
    T9198
    TcPlugin_RewritePerf
-------------------------

30 changed files:

compiler/GHC/Driver/DynFlags.hs
compiler/GHC/Driver/Session.hs
compiler/GHC/Settings.hs
compiler/GHC/Settings/IO.hs
compiler/GHC/SysTools/BaseDir.hs
compiler/ghc.cabal.in
configure.ac
distrib/configure.ac.in
hadrian/bindist/Makefile
hadrian/bindist/config.mk.in
hadrian/cfg/system.config.in
hadrian/src/Base.hs
hadrian/src/Rules/Generate.hs
libraries/ghc-boot/GHC/Settings/Utils.hs
libraries/ghc-boot/ghc-boot.cabal.in
libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
− m4/fp_settings.m4
m4/fp_setup_windows_toolchain.m4
+ m4/subst_tooldir.m4
mk/hsc2hs.in
testsuite/tests/ghc-api/T20757.hs
testsuite/tests/ghc-api/settings-escape/T24265.hs
testsuite/tests/ghc-api/settings-escape/T24265.stderr
+ testsuite/tests/ghc-api/settings-escape/ghc-install-folder/lib with spaces/targets/.gitkeep
utils/ghc-pkg/Main.hs
utils/ghc-pkg/ghc-pkg.cabal.in
utils/ghc-toolchain/exe/Main.hs
utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cpp.hs
utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cxx.hs

Changes:

compiler/GHC/Driver/DynFlags.hs

@@ -146,6 +146,7 @@ import qualified Data.Set as Set
  import GHC.Types.Unique.Set
  import qualified GHC.LanguageExtensions as LangExt
 +import GHC.Toolchain.Target (Target)
  -- -----------------------------------------------------------------------------
  -- DynFlags
@@ -179,6 +180,7 @@ data DynFlags = DynFlags {
    toolSettings      :: {-# UNPACK #-} !ToolSettings,
    platformMisc      :: {-# UNPACK #-} !PlatformMisc,
    rawSettings       :: [(String, String)],
 +  rawTarget         :: Target,
    tmpDir            :: TempDir,
    llvmOptLevel          :: Int,         -- ^ LLVM optimisation level
@@ -657,6 +659,7 @@ defaultDynFlags mySettings =
          targetPlatform = sTargetPlatform mySettings,
          platformMisc = sPlatformMisc mySettings,
          rawSettings = sRawSettings mySettings,
 +        rawTarget   = sRawTarget mySettings,
          tmpDir                  = panic "defaultDynFlags: uninitialized tmpDir",

compiler/GHC/Driver/Session.hs

@@ -280,6 +280,9 @@ import GHC.Parser.Lexer (mkParserOpts, initParserState, P(..), ParseResult(..))
  import GHC.SysTools.BaseDir ( expandToolDir, expandTopDir )
 +import GHC.Toolchain
 +import GHC.Toolchain.Program
++
  import Data.IORef
  import Control.Arrow ((&&&))
  import Control.Monad
@@ -404,6 +407,7 @@ settings dflags = Settings
    , sToolSettings = toolSettings dflags
    , sPlatformMisc = platformMisc dflags
    , sRawSettings = rawSettings dflags
 +  , sRawTarget = rawTarget dflags
+   }
  pgm_L                 :: DynFlags -> String
@@ -3455,9 +3459,58 @@ compilerInfo dflags
        -- Next come the settings, so anything else can be overridden
        -- in the settings file (as "lookup" uses the first match for the
        -- key)
 -    : map (fmap $ expandDirectories (topDir dflags) (toolDir dflags))
 -          (rawSettings dflags)
 -   ++ [("Project version",             projectVersion dflags),
 +     : map (fmap expandDirectories)
 +           (rawSettings dflags)
 +     ++
 +      [("C compiler command", queryCmd $ ccProgram . tgtCCompiler),
 +       ("C compiler flags", queryFlags $ ccProgram . tgtCCompiler),
 +       ("C++ compiler command", queryCmd $ cxxProgram . tgtCxxCompiler),
 +       ("C++ compiler flags", queryFlags $ cxxProgram . tgtCxxCompiler),
 +       ("C compiler link flags", queryFlags $ ccLinkProgram . tgtCCompilerLink),
 +       ("C compiler supports -no-pie", queryBool $ ccLinkSupportsNoPie . tgtCCompilerLink),
 +       ("CPP command", queryCmd $ cppProgram . tgtCPreprocessor),
 +       ("CPP flags", queryFlags $ cppProgram . tgtCPreprocessor),
 +       ("Haskell CPP command", queryCmd $ hsCppProgram . tgtHsCPreprocessor),
 +       ("Haskell CPP flags", queryFlags $ hsCppProgram . tgtHsCPreprocessor),
 +       ("JavaScript CPP command", queryCmdMaybe jsCppProgram tgtJsCPreprocessor),
 +       ("JavaScript CPP flags", queryFlagsMaybe jsCppProgram tgtJsCPreprocessor),
 +       ("C-- CPP command", queryCmd $ cmmCppProgram . tgtCmmCPreprocessor),
 +       ("C-- CPP flags", queryFlags $ cmmCppProgram . tgtCmmCPreprocessor),
 +       ("C-- CPP supports -g0", queryBool $ cmmCppSupportsG0 . tgtCmmCPreprocessor),
 +       ("ld supports compact unwind", queryBool $ ccLinkSupportsCompactUnwind . tgtCCompilerLink),
 +       ("ld supports filelist", queryBool $ ccLinkSupportsFilelist . tgtCCompilerLink),
 +       ("ld supports single module", queryBool $ ccLinkSupportsSingleModule . tgtCCompilerLink),
 +       ("ld is GNU ld", queryBool $ ccLinkIsGnu . tgtCCompilerLink),
 +       ("Merge objects command", queryCmdMaybe mergeObjsProgram tgtMergeObjs),
 +       ("Merge objects flags", queryFlagsMaybe mergeObjsProgram tgtMergeObjs),
 +       ("Merge objects supports response files", queryBool $ maybe False mergeObjsSupportsResponseFiles . tgtMergeObjs),
 +       ("ar command", queryCmd $ arMkArchive . tgtAr),
 +       ("ar flags", queryFlags $ arMkArchive . tgtAr),
 +       ("ar supports at file", queryBool $ arSupportsAtFile . tgtAr),
 +       ("ar supports -L", queryBool $ arSupportsDashL . tgtAr),
 +       ("ranlib command", queryCmdMaybe ranlibProgram tgtRanlib),
 +       ("otool command", queryCmdMaybe id tgtOtool),
 +       ("install_name_tool command", queryCmdMaybe id tgtInstallNameTool),
 +       ("windres command", queryCmd $ fromMaybe (Program "/bin/false" []) . tgtWindres),
 +       ("cross compiling", queryBool (not . tgtLocallyExecutable)),
 +       ("target platform string", query targetPlatformTriple),
 +       ("target os", query (show . archOS_OS . tgtArchOs)),
 +       ("target arch", query (show . archOS_arch . tgtArchOs)),
 +       ("target word size", query $ show . wordSize2Bytes . tgtWordSize),
 +       ("target word big endian", queryBool $ (\case BigEndian -> True; LittleEndian -> False) . tgtEndianness),
 +       ("target has GNU nonexec stack", queryBool tgtSupportsGnuNonexecStack),
 +       ("target has .ident directive", queryBool tgtSupportsIdentDirective),
 +       ("target has subsections via symbols", queryBool tgtSupportsSubsectionsViaSymbols),
 +       ("Unregisterised", queryBool tgtUnregisterised),
 +       ("LLVM target", query tgtLlvmTarget),
 +       ("LLVM llc command", queryCmdMaybe id tgtLlc),
 +       ("LLVM opt command", queryCmdMaybe id tgtOpt),
 +       ("LLVM llvm-as command", queryCmdMaybe id tgtLlvmAs),
 +       ("LLVM llvm-as flags", queryFlagsMaybe id tgtLlvmAs),
 +       ("Tables next to code", queryBool tgtTablesNextToCode),
 +       ("Leading underscore", queryBool tgtSymbolsHaveLeadingUnderscore)
 +      ] ++
 +      [("Project version",             projectVersion dflags),
         ("Project Git commit id",       cProjectGitCommitId),
         ("Project Version Int",         cProjectVersionInt),
         ("Project Patch Level",         cProjectPatchLevel),
@@ -3514,9 +3567,16 @@ compilerInfo dflags
      showBool False = "NO"
      platform  = targetPlatform dflags
      isWindows = platformOS platform == OSMinGW32
 -    useInplaceMinGW = toolSettings_useInplaceMinGW $ toolSettings dflags
 -    expandDirectories :: FilePath -> Maybe FilePath -> String -> String
 -    expandDirectories topd mtoold = expandToolDir useInplaceMinGW mtoold . expandTopDir topd
 +    expandDirectories = expandToolDir (toolDir dflags) . expandTopDir (topDir dflags)
 +    query :: (Target -> a) -> a
 +    query f = f (rawTarget dflags)
 +    queryFlags f = query (unwords . map escapeArg . prgFlags . f)
 +    queryCmd f = expandDirectories (query (prgPath . f))
 +    queryBool = showBool . query
++
 +    queryCmdMaybe, queryFlagsMaybe :: (a -> Program) -> (Target -> Maybe a) -> String
 +    queryCmdMaybe p f = expandDirectories (query (maybe "" (prgPath . p) . f))
 +    queryFlagsMaybe p f = query (maybe "" (unwords . map escapeArg . prgFlags . p) . f)
  -- Note [Special unit-ids]
  -- ~~~~~~~~~~~~~~~~~~~~~~~
@@ -3844,3 +3904,19 @@ updatePlatformConstants dflags mconstants = do
    let platform1 = (targetPlatform dflags) { platform_constants = mconstants }
    let dflags1   = dflags { targetPlatform = platform1 }
    return dflags1
++
 +-- ----------------------------------------------------------------------------
 +-- Escape Args helpers
 +-- ----------------------------------------------------------------------------
++
 +-- | Just like 'GHC.ResponseFile.escapeArg', but it is not exposed from base.
 +escapeArg :: String -> String
 +escapeArg = reverse . foldl' escape []
++
 +escape :: String -> Char -> String
 +escape cs c
 +  |    isSpace c
 +    || '\\' == c
 +    || '\'' == c
 +    || '"'  == c = c:'\\':cs -- n.b., our caller must reverse the result
 +  | otherwise    = c:cs

compiler/GHC/Settings.hs

@@ -23,7 +23,6 @@ module GHC.Settings
    , sMergeObjsSupportsResponseFiles
    , sLdIsGnuLd
    , sGccSupportsNoPie
 -  , sUseInplaceMinGW
    , sArSupportsDashL
    , sPgm_L
    , sPgm_P
@@ -75,6 +74,7 @@ import GHC.Utils.CliOption
  import GHC.Utils.Fingerprint
  import GHC.Platform
  import GHC.Unit.Types
 +import GHC.Toolchain.Target
  data Settings = Settings
    { sGhcNameVersion    :: {-# UNPACk #-} !GhcNameVersion
@@ -87,6 +87,10 @@ data Settings = Settings
    -- You shouldn't need to look things up in rawSettings directly.
    -- They should have their own fields instead.
    , sRawSettings       :: [(String, String)]
++
 +  -- Store the target to print out information about the raw target description
 +  -- (e.g. in --info)
 +  , sRawTarget         :: Target
+   }
  data UnitSettings = UnitSettings { unitSettings_baseUnitId :: !UnitId }
@@ -102,7 +106,6 @@ data ToolSettings = ToolSettings
    , toolSettings_mergeObjsSupportsResponseFiles :: Bool
    , toolSettings_ldIsGnuLd               :: Bool
    , toolSettings_ccSupportsNoPie         :: Bool
 -  , toolSettings_useInplaceMinGW         :: Bool
    , toolSettings_arSupportsDashL         :: Bool
    , toolSettings_cmmCppSupportsG0        :: Bool
@@ -221,8 +224,6 @@ sLdIsGnuLd :: Settings -> Bool
  sLdIsGnuLd = toolSettings_ldIsGnuLd . sToolSettings
  sGccSupportsNoPie :: Settings -> Bool
  sGccSupportsNoPie = toolSettings_ccSupportsNoPie . sToolSettings
 -sUseInplaceMinGW :: Settings -> Bool
 -sUseInplaceMinGW = toolSettings_useInplaceMinGW . sToolSettings
  sArSupportsDashL :: Settings -> Bool
  sArSupportsDashL = toolSettings_arSupportsDashL . sToolSettings

compiler/GHC/Settings/IO.hs

+-
 +{-# LANGUAGE RecordWildCards #-}
  {-# LANGUAGE LambdaCase #-}
  {-# LANGUAGE ScopedTypeVariables #-}
@@ -16,18 +16,20 @@ import GHC.Utils.CliOption
  import GHC.Utils.Fingerprint
  import GHC.Platform
  import GHC.Utils.Panic
 -import GHC.ResponseFile
  import GHC.Settings
  import GHC.SysTools.BaseDir
  import GHC.Unit.Types
  import Control.Monad.Trans.Except
  import Control.Monad.IO.Class
 -import Data.Char
  import qualified Data.Map as Map
  import System.FilePath
  import System.Directory
 +import GHC.Toolchain.Program
 +import GHC.Toolchain
 +import GHC.Data.Maybe
 +import Data.Bifunctor (Bifunctor(second))
  data SettingsError
    = SettingsError_MissingData String
@@ -44,6 +46,7 @@ initSettings top_dir = do
        libexec :: FilePath -> FilePath
        libexec file = top_dir </> ".." </> "bin" </> file
        settingsFile = installed "settings"
 +      targetFile   = installed $ "targets" </> "default.target"
        readFileSafe :: FilePath -> ExceptT SettingsError m String
        readFileSafe path = liftIO (doesFileExist path) >>= \case
@@ -55,85 +58,72 @@ initSettings top_dir = do
      Just s -> pure s
      Nothing -> throwE $ SettingsError_BadData $
        "Can't parse " ++ show settingsFile
 +  targetStr <- readFileSafe targetFile
 +  target <- case maybeReadFuzzy @Target targetStr of
 +    Just s -> pure s
 +    Nothing -> throwE $ SettingsError_BadData $
 +      "Can't parse as Target " ++ show targetFile
    let mySettings = Map.fromList settingsList
        getBooleanSetting :: String -> ExceptT SettingsError m Bool
        getBooleanSetting key = either pgmError pure $
          getRawBooleanSetting settingsFile mySettings key
 -  -- On Windows, by mingw is often distributed with GHC,
 -  -- so we look in TopDir/../mingw/bin,
 -  -- as well as TopDir/../../mingw/bin for hadrian.
 -  -- But we might be disabled, in which we we don't do that.
 -  useInplaceMinGW <- getBooleanSetting "Use inplace MinGW toolchain"
+-
    -- see Note [topdir: How GHC finds its files]
    -- NB: top_dir is assumed to be in standard Unix
    -- format, '/' separated
 -  mtool_dir <- liftIO $ findToolDir useInplaceMinGW top_dir
 +  mtool_dir <- liftIO $ findToolDir top_dir
          -- see Note [tooldir: How GHC finds mingw on Windows]
 -    -- Escape 'top_dir' and 'mtool_dir', to make sure we don't accidentally
 -    -- introduce unescaped spaces. See #24265 and #25204.
 -  let escaped_top_dir = escapeArg top_dir
 -      escaped_mtool_dir = fmap escapeArg mtool_dir
+-
 -      getSetting_raw key = either pgmError pure $
 +  let getSetting_raw key = either pgmError pure $
          getRawSetting settingsFile mySettings key
        getSetting_topDir top key = either pgmError pure $
          getRawFilePathSetting top settingsFile mySettings key
        getSetting_toolDir top tool key =
 -        expandToolDir useInplaceMinGW tool <$> getSetting_topDir top key
+-
 -      getSetting :: String -> ExceptT SettingsError m String
 +        expandToolDir tool <$> getSetting_topDir top key
        getSetting key = getSetting_topDir top_dir key
 -      getToolSetting :: String -> ExceptT SettingsError m String
        getToolSetting key = getSetting_toolDir top_dir mtool_dir key
 -      getFlagsSetting :: String -> ExceptT SettingsError m [String]
 -      getFlagsSetting key = unescapeArgs <$> getSetting_toolDir escaped_top_dir escaped_mtool_dir key
 -        -- Make sure to unescape, as we have escaped top_dir and tool_dir.
++
 +      expandDirVars top tool = expandToolDir tool . expandTopDir top
++
 +      getToolPath :: (Target -> Program) -> String
 +      getToolPath key = expandDirVars top_dir mtool_dir (prgPath . key $ target)
++
 +      getMaybeToolPath :: (Target -> Maybe Program) -> String
 +      getMaybeToolPath key = getToolPath (fromMaybe (Program "" []) . key)
++
 +      getToolFlags :: (Target -> Program) -> [String]
 +      getToolFlags key = expandDirVars top_dir mtool_dir <$> (prgFlags . key $ target)
++
 +      getTool :: (Target -> Program) -> (String, [String])
 +      getTool key = (getToolPath key, getToolFlags key)
    -- See Note [Settings file] for a little more about this file. We're
    -- just partially applying those functions and throwing 'Left's; they're
    -- written in a very portable style to keep ghc-boot light.
 -  targetPlatformString <- getSetting_raw "target platform string"
 -  cc_prog <- getToolSetting "C compiler command"
 -  cxx_prog <- getToolSetting "C++ compiler command"
 -  cc_args0 <- getFlagsSetting "C compiler flags"
 -  cxx_args <- getFlagsSetting "C++ compiler flags"
 -  gccSupportsNoPie <- getBooleanSetting "C compiler supports -no-pie"
 -  cmmCppSupportsG0 <- getBooleanSetting "C-- CPP supports -g0"
 -  cpp_prog <- getToolSetting "CPP command"
 -  cpp_args <- map Option <$> getFlagsSetting "CPP flags"
 -  hs_cpp_prog <- getToolSetting "Haskell CPP command"
 -  hs_cpp_args <- map Option <$> getFlagsSetting "Haskell CPP flags"
 -  js_cpp_prog <- getToolSetting "JavaScript CPP command"
 -  js_cpp_args <- map Option <$> getFlagsSetting "JavaScript CPP flags"
 -  cmmCpp_prog <- getToolSetting "C-- CPP command"
 -  cmmCpp_args <- map Option <$> getFlagsSetting "C-- CPP flags"
+-
 -  platform <- either pgmError pure $ getTargetPlatform settingsFile mySettings
+-
 -  let unreg_cc_args = if platformUnregisterised platform
 -                      then ["-DNO_REGS", "-DUSE_MINIINTERPRETER"]
 -                      else []
 -      cc_args = cc_args0 ++ unreg_cc_args
+-
 -      -- The extra flags we need to pass gcc when we invoke it to compile .hc code.
 -      --
 -      -- -fwrapv is needed for gcc to emit well-behaved code in the presence of
 -      -- integer wrap around (#952).
 -      extraGccViaCFlags = if platformUnregisterised platform
 -                            -- configure guarantees cc support these flags
 -                            then ["-fwrapv", "-fno-builtin"]
 -                            else []
+-
 -  ldSupportsCompactUnwind <- getBooleanSetting "ld supports compact unwind"
 -  ldSupportsFilelist      <- getBooleanSetting "ld supports filelist"
 -  ldSupportsSingleModule  <- getBooleanSetting "ld supports single module"
 -  mergeObjsSupportsResponseFiles <- getBooleanSetting "Merge objects supports response files"
 -  ldIsGnuLd               <- getBooleanSetting "ld is GNU ld"
 -  arSupportsDashL         <- getBooleanSetting "ar supports -L"
+-
 +  targetHasLibm <- getBooleanSetting "target has libm"
 +  let
 +    (cc_prog, cc_args0)  = getTool (ccProgram . tgtCCompiler)
 +    (cxx_prog, cxx_args) = getTool (cxxProgram . tgtCxxCompiler)
 +    (cpp_prog, cpp_args) = getTool (cppProgram . tgtCPreprocessor)
 +    (hs_cpp_prog, hs_cpp_args) = getTool (hsCppProgram . tgtHsCPreprocessor)
 +    (js_cpp_prog, js_cpp_args) = getTool (maybe (Program "" []) jsCppProgram . tgtJsCPreprocessor)
 +    (cmmCpp_prog, cmmCpp_args) = getTool (cmmCppProgram . tgtCmmCPreprocessor)
++
 +    platform = getTargetPlatform targetHasLibm target
++
 +    unreg_cc_args = if platformUnregisterised platform
 +                    then ["-DNO_REGS", "-DUSE_MINIINTERPRETER"]
 +                    else []
 +    cc_args = cc_args0 ++ unreg_cc_args
++
 +    -- The extra flags we need to pass gcc when we invoke it to compile .hc code.
 +    --
 +    -- -fwrapv is needed for gcc to emit well-behaved code in the presence of
 +    -- integer wrap around (#952).
 +    extraGccViaCFlags = if platformUnregisterised platform
 +                          -- configure guarantees cc support these flags
 +                          then ["-fwrapv", "-fno-builtin"]
 +                          else []
    -- The package database is either a relative path to the location of the settings file
    -- OR an absolute path.
@@ -148,41 +138,20 @@ initSettings top_dir = do
    -- architecture-specific stuff is done when building Config.hs
    unlit_path <- getToolSetting "unlit command"
 -  windres_path <- getToolSetting "windres command"
 -  ar_path <- getToolSetting "ar command"
 -  otool_path <- getToolSetting "otool command"
 -  install_name_tool_path <- getToolSetting "install_name_tool command"
 -  ranlib_path <- getToolSetting "ranlib command"
+-
 -  -- HACK, see setPgmP below. We keep 'words' here to remember to fix
 -  -- Config.hs one day.
+-
+-
 -  -- Other things being equal, 'as' and 'ld' are simply 'gcc'
 -  cc_link_args <- getFlagsSetting "C compiler link flags"
 -  let   as_prog  = cc_prog
 -        as_args  = map Option cc_args
 -        ld_prog  = cc_prog
 -        ld_args  = map Option (cc_args ++ cc_link_args)
 -  ld_r_prog <- getToolSetting "Merge objects command"
 -  ld_r_args <- getFlagsSetting "Merge objects flags"
 -  let ld_r
 -        | null ld_r_prog = Nothing
 -        | otherwise      = Just (ld_r_prog, map Option ld_r_args)
+-
 -  llvmTarget <- getSetting_raw "LLVM target"
+-
 -  -- We just assume on command line
 -  lc_prog <- getToolSetting "LLVM llc command"
 -  lo_prog <- getToolSetting "LLVM opt command"
 -  las_prog <- getToolSetting "LLVM llvm-as command"
 -  las_args <- map Option <$> getFlagsSetting "LLVM llvm-as flags"
+-
 -  let iserv_prog = libexec "ghc-iserv"
 +  -- Other things being equal, 'as' is simply 'gcc'
 +  let (cc_link, cc_link_args) = getTool (ccLinkProgram . tgtCCompilerLink)
 +      as_prog      = cc_prog
 +      as_args      = map Option cc_args
 +      ld_prog      = cc_link
 +      ld_args      = map Option (cc_args ++ cc_link_args)
 +      ld_r         = do
 +        ld_r_prog <- tgtMergeObjs target
 +        let (ld_r_path, ld_r_args) = getTool (mergeObjsProgram . const ld_r_prog)
 +        pure (ld_r_path, map Option ld_r_args)
 +      iserv_prog   = libexec "ghc-iserv"
    targetRTSLinkerOnlySupportsSharedLibs <- getBooleanSetting "target RTS linker only supports shared libraries"
    ghcWithInterpreter <- getBooleanSetting "Use interpreter"
 -  useLibFFI <- getBooleanSetting "Use LibFFI"
    baseUnitId <- getSetting_raw "base unit-id"
@@ -206,36 +175,38 @@ initSettings top_dir = do
+       }
      , sToolSettings = ToolSettings
 -      { toolSettings_ldSupportsCompactUnwind = ldSupportsCompactUnwind
 -      , toolSettings_ldSupportsFilelist      = ldSupportsFilelist
 -      , toolSettings_ldSupportsSingleModule  = ldSupportsSingleModule
 -      , toolSettings_mergeObjsSupportsResponseFiles = mergeObjsSupportsResponseFiles
 -      , toolSettings_ldIsGnuLd               = ldIsGnuLd
 -      , toolSettings_ccSupportsNoPie         = gccSupportsNoPie
 -      , toolSettings_useInplaceMinGW         = useInplaceMinGW
 -      , toolSettings_arSupportsDashL         = arSupportsDashL
 -      , toolSettings_cmmCppSupportsG0        = cmmCppSupportsG0
+-
 -      , toolSettings_pgm_L   = unlit_path
 -      , toolSettings_pgm_P   = (hs_cpp_prog, hs_cpp_args)
 -      , toolSettings_pgm_JSP = (js_cpp_prog, js_cpp_args)
 -      , toolSettings_pgm_CmmP = (cmmCpp_prog, cmmCpp_args)
 -      , toolSettings_pgm_F   = ""
 -      , toolSettings_pgm_c   = cc_prog
 -      , toolSettings_pgm_cxx = cxx_prog
 -      , toolSettings_pgm_cpp = (cpp_prog, cpp_args)
 -      , toolSettings_pgm_a   = (as_prog, as_args)
 -      , toolSettings_pgm_l   = (ld_prog, ld_args)
 -      , toolSettings_pgm_lm  = ld_r
 -      , toolSettings_pgm_windres = windres_path
 -      , toolSettings_pgm_ar = ar_path
 -      , toolSettings_pgm_otool = otool_path
 -      , toolSettings_pgm_install_name_tool = install_name_tool_path
 -      , toolSettings_pgm_ranlib = ranlib_path
 -      , toolSettings_pgm_lo  = (lo_prog,[])
 -      , toolSettings_pgm_lc  = (lc_prog,[])
 -      , toolSettings_pgm_las = (las_prog, las_args)
 -      , toolSettings_pgm_i   = iserv_prog
 +      { toolSettings_ldSupportsCompactUnwind = ccLinkSupportsCompactUnwind $ tgtCCompilerLink target
 +      , toolSettings_ldSupportsFilelist      = ccLinkSupportsFilelist      $ tgtCCompilerLink target
 +      , toolSettings_ldSupportsSingleModule  = ccLinkSupportsSingleModule  $ tgtCCompilerLink target
 +      , toolSettings_ldIsGnuLd               = ccLinkIsGnu                 $ tgtCCompilerLink target
 +      , toolSettings_ccSupportsNoPie         = ccLinkSupportsNoPie         $ tgtCCompilerLink target
 +      , toolSettings_mergeObjsSupportsResponseFiles
 +                                      = maybe False mergeObjsSupportsResponseFiles
 +                                                         $ tgtMergeObjs target
 +      , toolSettings_arSupportsDashL  = arSupportsDashL  $ tgtAr target
 +      , toolSettings_cmmCppSupportsG0 = cmmCppSupportsG0 $ tgtCmmCPreprocessor target
++
 +      , toolSettings_pgm_L       = unlit_path
 +      , toolSettings_pgm_P       = (hs_cpp_prog, map Option hs_cpp_args)
 +      , toolSettings_pgm_JSP     = (js_cpp_prog, map Option js_cpp_args)
 +      , toolSettings_pgm_CmmP    = (cmmCpp_prog, map Option cmmCpp_args)
 +      , toolSettings_pgm_F       = ""
 +      , toolSettings_pgm_c       = cc_prog
 +      , toolSettings_pgm_cxx     = cxx_prog
 +      , toolSettings_pgm_cpp     = (cpp_prog, map Option cpp_args)
 +      , toolSettings_pgm_a       = (as_prog, as_args)
 +      , toolSettings_pgm_l       = (ld_prog, ld_args)
 +      , toolSettings_pgm_lm      = ld_r
 +      , toolSettings_pgm_windres = getMaybeToolPath tgtWindres
 +      , toolSettings_pgm_ar      = getToolPath (arMkArchive . tgtAr)
 +      , toolSettings_pgm_otool   = getMaybeToolPath tgtOtool
 +      , toolSettings_pgm_install_name_tool = getMaybeToolPath tgtInstallNameTool
 +      , toolSettings_pgm_ranlib  = getMaybeToolPath (fmap ranlibProgram . tgtRanlib)
 +      , toolSettings_pgm_lo      = (getMaybeToolPath tgtOpt,[])
 +      , toolSettings_pgm_lc      = (getMaybeToolPath tgtLlc,[])
 +      , toolSettings_pgm_las     = second (map Option) $
 +                                   getTool (fromMaybe (Program "" []) . tgtLlvmAs)
 +      , toolSettings_pgm_i       = iserv_prog
        , toolSettings_opt_L       = []
        , toolSettings_opt_P       = []
        , toolSettings_opt_JSP     = []
@@ -260,65 +231,30 @@ initSettings top_dir = do
      , sTargetPlatform = platform
      , sPlatformMisc = PlatformMisc
 -      { platformMisc_targetPlatformString = targetPlatformString
 +      { platformMisc_targetPlatformString = targetPlatformTriple target
        , platformMisc_ghcWithInterpreter = ghcWithInterpreter
 -      , platformMisc_libFFI = useLibFFI
 -      , platformMisc_llvmTarget = llvmTarget
 +      , platformMisc_libFFI = tgtUseLibffiForAdjustors target
 +      , platformMisc_llvmTarget = tgtLlvmTarget target
        , platformMisc_targetRTSLinkerOnlySupportsSharedLibs = targetRTSLinkerOnlySupportsSharedLibs
+       }
      , sRawSettings    = settingsList
 +    , sRawTarget      = target
+     }
 -getTargetPlatform
 -  :: FilePath     -- ^ Settings filepath (for error messages)
 -  -> RawSettings  -- ^ Raw settings file contents
 -  -> Either String Platform
 -getTargetPlatform settingsFile settings = do
 -  let
 -    getBooleanSetting = getRawBooleanSetting settingsFile settings
 -    readSetting :: (Show a, Read a) => String -> Either String a
 -    readSetting = readRawSetting settingsFile settings
+-
 -  targetArchOS <- getTargetArchOS settingsFile settings
 -  targetWordSize <- readSetting "target word size"
 -  targetWordBigEndian <- getBooleanSetting "target word big endian"
 -  targetLeadingUnderscore <- getBooleanSetting "Leading underscore"
 -  targetUnregisterised <- getBooleanSetting "Unregisterised"
 -  targetHasGnuNonexecStack <- getBooleanSetting "target has GNU nonexec stack"
 -  targetHasIdentDirective <- getBooleanSetting "target has .ident directive"
 -  targetHasSubsectionsViaSymbols <- getBooleanSetting "target has subsections via symbols"
 -  targetHasLibm <- getBooleanSetting "target has libm"
 -  crossCompiling <- getBooleanSetting "cross compiling"
 -  tablesNextToCode <- getBooleanSetting "Tables next to code"
+-
 -  pure $ Platform
 -    { platformArchOS    = targetArchOS
 -    , platformWordSize  = targetWordSize
 -    , platformByteOrder = if targetWordBigEndian then BigEndian else LittleEndian
 -    , platformUnregisterised = targetUnregisterised
 -    , platformHasGnuNonexecStack = targetHasGnuNonexecStack
 -    , platformHasIdentDirective = targetHasIdentDirective
 -    , platformHasSubsectionsViaSymbols = targetHasSubsectionsViaSymbols
 -    , platformIsCrossCompiling = crossCompiling
 -    , platformLeadingUnderscore = targetLeadingUnderscore
 -    , platformTablesNextToCode  = tablesNextToCode
 +getTargetPlatform :: Bool {-^ Does target have libm -} -> Target -> Platform
 +getTargetPlatform targetHasLibm Target{..} = Platform
 +    { platformArchOS    = tgtArchOs
 +    , platformWordSize  = case tgtWordSize of WS4 -> PW4
 +                                              WS8 -> PW8
 +    , platformByteOrder = tgtEndianness
 +    , platformUnregisterised = tgtUnregisterised
 +    , platformHasGnuNonexecStack = tgtSupportsGnuNonexecStack
 +    , platformHasIdentDirective = tgtSupportsIdentDirective
 +    , platformHasSubsectionsViaSymbols = tgtSupportsSubsectionsViaSymbols
 +    , platformIsCrossCompiling = not tgtLocallyExecutable
 +    , platformLeadingUnderscore = tgtSymbolsHaveLeadingUnderscore
 +    , platformTablesNextToCode  = tgtTablesNextToCode
      , platformHasLibm = targetHasLibm
      , platform_constants = Nothing -- will be filled later when loading (or building) the RTS unit
+     }
+-
 --- ----------------------------------------------------------------------------
 --- Escape Args helpers
 --- ----------------------------------------------------------------------------
+-
 --- | Just like 'GHC.ResponseFile.escapeArg', but it is not exposed from base.
 -escapeArg :: String -> String
 -escapeArg = reverse . foldl' escape []
+-
 -escape :: String -> Char -> String
 -escape cs c
 -  |    isSpace c
 -    || '\\' == c
 -    || '\'' == c
 -    || '"'  == c = c:'\\':cs -- n.b., our caller must reverse the result
 -  | otherwise    = c:cs

compiler/GHC/SysTools/BaseDir.hs

@@ -90,13 +90,10 @@ the build system finds and wires through the toolchain information.
 ) The next step is to generate the settings file: The file
    `cfg/system.config.in` is preprocessed by configure and the output written to
    `system.config`.  This serves the same purpose as `config.mk` but it rewrites
 -  the values that were exported.  As an example `SettingsCCompilerCommand` is
 -  rewritten to `settings-c-compiler-command`.
 +  the values that were exported.
    Next up is `src/Oracles/Settings.hs` which makes from some Haskell ADT to
 -  the settings `keys` in the `system.config`.  As an example,
 -  `settings-c-compiler-command` is mapped to
 -  `SettingsFileSetting_CCompilerCommand`.
 +  the settings `keys` in the `system.config`.
    The last part of this is the `generateSettings` in `src/Rules/Generate.hs`
    which produces the desired settings file out of Hadrian. This is the
@@ -122,15 +119,13 @@ play nice with the system compiler instead.
  -- | Expand occurrences of the @$tooldir@ interpolation in a string
  -- on Windows, leave the string untouched otherwise.
  expandToolDir
 -  :: Bool -- ^ whether we use the ambient mingw toolchain
 -  -> Maybe FilePath -- ^ tooldir
 +  :: Maybe FilePath -- ^ tooldir
    -> String -> String
  #if defined(mingw32_HOST_OS)
 -expandToolDir False (Just tool_dir) s = expandPathVar "tooldir" tool_dir s
 -expandToolDir False Nothing         _ = panic "Could not determine $tooldir"
 -expandToolDir True  _               s = s
 +expandToolDir (Just tool_dir) s = expandPathVar "tooldir" tool_dir s
 +expandToolDir Nothing         _ = panic "Could not determine $tooldir"
  #else
 -expandToolDir _ _ s = s
 +expandToolDir _ s = s
  #endif
  -- | Returns a Unix-format path pointing to TopDir.
@@ -164,13 +159,13 @@ tryFindTopDir Nothing
  -- Returns @Nothing@ when not on Windows.
  -- When called on Windows, it either throws an error when the
  -- tooldir can't be located, or returns @Just tooldirpath@.
 --- If the distro toolchain is being used we treat Windows the same as Linux
 +-- If the distro toolchain is being used, there will be no variables to
 +-- substitute for anyway, so this is a no-op.
  findToolDir
 -  :: Bool -- ^ whether we use the ambient mingw toolchain
 -  -> FilePath -- ^ topdir
 +  :: FilePath -- ^ topdir
    -> IO (Maybe FilePath)
  #if defined(mingw32_HOST_OS)
 -findToolDir False top_dir = go 0 (top_dir </> "..") []
 +findToolDir top_dir = go 0 (top_dir </> "..") []
    where maxDepth = 3
          go :: Int -> FilePath -> [FilePath] -> IO (Maybe FilePath)
          go k path tried
@@ -183,7 +178,6 @@ findToolDir False top_dir = go 0 (top_dir </> "..") []
                if oneLevel
                  then return (Just path)
                  else go (k+1) (path </> "..") tried'
 -findToolDir True _ = return Nothing
  #else
 -findToolDir _ _ = return Nothing
 +findToolDir _ = return Nothing
  #endif

compiler/ghc.cabal.in

@@ -131,6 +131,7 @@ Library
                     semaphore-compat,
                     stm,
                     rts,
 +                   ghc-toolchain,
                     ghc-boot   == @ProjectVersionMunged@,
                     ghc-heap   == @ProjectVersionMunged@,
                     ghci == @ProjectVersionMunged@

configure.ac

@@ -132,6 +132,7 @@ AC_ARG_ENABLE(distro-toolchain,
    [FP_CAPITALIZE_YES_NO(["$enableval"], [EnableDistroToolchain])],
    [EnableDistroToolchain=NO]
+ )
 +AC_SUBST([EnableDistroToolchain])
  if test "$EnableDistroToolchain" = "YES"; then
    TarballsAutodownload=NO
@@ -760,8 +761,6 @@ FP_PROG_AR_NEEDS_RANLIB
  dnl ** Check to see whether ln -s works
  AC_PROG_LN_S
 -FP_SETTINGS
+-
  dnl ** Find the path to sed
  AC_PATH_PROGS(SedCmd,gsed sed,sed)

distrib/configure.ac.in

@@ -89,8 +89,9 @@ AC_ARG_ENABLE(distro-toolchain,
  [AS_HELP_STRING([--enable-distro-toolchain],
                  [Do not use bundled Windows toolchain binaries.])],
    [FP_CAPITALIZE_YES_NO(["$enableval"], [EnableDistroToolchain])],
 -  [EnableDistroToolchain=@SettingsUseDistroMINGW@]
 +  [EnableDistroToolchain=@EnableDistroToolchain@]
+ )
 +AC_SUBST([EnableDistroToolchain])
  if test "$HostOS" = "mingw32" -a "$EnableDistroToolchain" = "NO"; then
    FP_SETUP_WINDOWS_TOOLCHAIN([$hardtop/mingw/], [\$\$topdir/../mingw/])
@@ -384,8 +385,6 @@ fi
  AC_SUBST(BaseUnitId)
 -FP_SETTINGS
+-
  # We get caught by
  #     http://savannah.gnu.org/bugs/index.php?1516
  #     $(eval ...) inside conditionals causes errors
@@ -418,6 +417,34 @@ AC_OUTPUT
  VALIDATE_GHC_TOOLCHAIN([default.target],[default.target.ghc-toolchain])
 +if test "$EnableDistroToolchain" = "YES"; then
 +    # If the user specified --enable-distro-toolchain then we just use the
 +    # executable names, not paths. We do this by finding strings of paths to
 +    # programs and keeping the basename only:
 +    cp default.target default.target.bak
++
 +    while IFS= read -r line; do
 +      if echo "$line" | grep -q 'prgPath = "'; then
 +        path=$(echo "$line" | sed -E 's/.*prgPath = "([[^"]]+)".*/\1/')
 +        base=$(basename "$path")
 +        echo "$line" | sed "s|$path|$base|"
 +      else
 +        echo "$line"
 +      fi
 +    done < default.target.bak > default.target
 +    echo "Applied --enable-distro-toolchain basename substitution to default.target:"
 +    cat default.target
 +fi
++
 +if test "$windows" = YES -a "$EnableDistroToolchain" = "NO"; then
 +    # Handle the Windows toolchain installed in FP_SETUP_WINDOWS_TOOLCHAIN.
 +    # We need to issue a substitution to use $tooldir,
 +    # See Note [tooldir: How GHC finds mingw on Windows]
 +    SUBST_TOOLDIR([default.target])
 +    echo "Applied tooldir substitution to default.target:"
 +    cat default.target
 +fi
++
  rm -Rf acargs acghc-toolchain actmp-ghc-toolchain
  echo "****************************************************"

hadrian/bindist/Makefile

@@ -85,67 +85,22 @@ WrapperBinsDir=${bindir}
  # N.B. this is duplicated from includes/ghc.mk.
  lib/settings : config.mk
  	@rm -f $@
 -	@echo '[("C compiler command", "$(SettingsCCompilerCommand)")' >> $@
 -	@echo ',("C compiler flags", "$(SettingsCCompilerFlags)")' >> $@
 -	@echo ',("C++ compiler command", "$(SettingsCxxCompilerCommand)")' >> $@
 -	@echo ',("C++ compiler flags", "$(SettingsCxxCompilerFlags)")' >> $@
 -	@echo ',("C compiler link flags", "$(SettingsCCompilerLinkFlags)")' >> $@
 -	@echo ',("C compiler supports -no-pie", "$(SettingsCCompilerSupportsNoPie)")' >> $@
 -	@echo ',("CPP command", "$(SettingsCPPCommand)")' >> $@
 -	@echo ',("CPP flags", "$(SettingsCPPFlags)")' >> $@
 -	@echo ',("Haskell CPP command", "$(SettingsHaskellCPPCommand)")' >> $@
 -	@echo ',("Haskell CPP flags", "$(SettingsHaskellCPPFlags)")' >> $@
 -	@echo ',("JavaScript CPP command", "$(SettingsJavaScriptCPPCommand)")' >> $@
 -	@echo ',("JavaScript CPP flags", "$(SettingsJavaScriptCPPFlags)")' >> $@
 -	@echo ',("C-- CPP command", "$(SettingsCmmCPPCommand)")' >> $@
 -	@echo ',("C-- CPP flags", "$(SettingsCmmCPPFlags)")' >> $@
 -	@echo ',("C-- CPP supports -g0", "$(SettingsCmmCPPSupportsG0)")' >> $@
 -	@echo ',("ld supports compact unwind", "$(LdHasNoCompactUnwind)")' >> $@
 -	@echo ',("ld supports filelist", "$(LdHasFilelist)")' >> $@
 -	@echo ',("ld supports single module", "$(LdHasSingleModule)")' >> $@
 -	@echo ',("ld is GNU ld", "$(LdIsGNULd)")' >> $@
 -	@echo ',("Merge objects command", "$(SettingsMergeObjectsCommand)")' >> $@
 -	@echo ',("Merge objects flags", "$(SettingsMergeObjectsFlags)")' >> $@
 -	@echo ',("Merge objects supports response files", "$(MergeObjsSupportsResponseFiles)")' >> $@
 -	@echo ',("ar command", "$(SettingsArCommand)")' >> $@
 -	@echo ',("ar flags", "$(ArArgs)")' >> $@
 -	@echo ',("ar supports at file", "$(ArSupportsAtFile)")' >> $@
 -	@echo ',("ar supports -L", "$(ArSupportsDashL)")' >> $@
 -	@echo ',("ranlib command", "$(SettingsRanlibCommand)")' >> $@
 -	@echo ',("otool command", "$(SettingsOtoolCommand)")' >> $@
 -	@echo ',("install_name_tool command", "$(SettingsInstallNameToolCommand)")' >> $@
 -	@echo ',("windres command", "$(SettingsWindresCommand)")' >> $@
 +	@echo '[("target has libm", "$(TargetHasLibm)")' >> $@
  	@echo ',("unlit command", "$$topdir/../bin/$(CrossCompilePrefix)unlit")' >> $@
 -	@echo ',("cross compiling", "$(CrossCompiling)")' >> $@
 -	@echo ',("target platform string", "$(TARGETPLATFORM)")' >> $@
 -	@echo ',("target os", "$(HaskellTargetOs)")' >> $@
 -	@echo ',("target arch", "$(HaskellTargetArch)")' >> $@
 -	@echo ',("target word size", "$(TargetWordSize)")' >> $@
 -	@echo ',("target word big endian", "$(TargetWordBigEndian)")' >> $@
 -	@echo ',("target has GNU nonexec stack", "$(TargetHasGnuNonexecStack)")' >> $@
 -	@echo ',("target has .ident directive", "$(TargetHasIdentDirective)")' >> $@
 -	@echo ',("target has subsections via symbols", "$(TargetHasSubsectionsViaSymbols)")' >> $@
 -	@echo ',("target has libm", "$(TargetHasLibm)")' >> $@
 -	@echo ',("Unregisterised", "$(GhcUnregisterised)")' >> $@
 -	@echo ',("LLVM target", "$(LLVMTarget)")' >> $@
 -	@echo ',("LLVM llc command", "$(SettingsLlcCommand)")' >> $@
 -	@echo ',("LLVM opt command", "$(SettingsOptCommand)")' >> $@
 -	@echo ',("LLVM llvm-as command", "$(SettingsLlvmAsCommand)")' >> $@
 -	@echo ',("LLVM llvm-as flags", "$(SettingsLlvmAsFlags)")' >> $@
 -	@echo ',("Use inplace MinGW toolchain", "$(SettingsUseDistroMINGW)")' >> $@
 -	@echo
  	@echo ',("target RTS linker only supports shared libraries", "$(TargetRTSLinkerOnlySupportsSharedLibs)")' >> $@
  	@echo ',("Use interpreter", "$(GhcWithInterpreter)")' >> $@
  	@echo ',("Support SMP", "$(GhcWithSMP)")' >> $@
  	@echo ',("RTS ways", "$(GhcRTSWays)")' >> $@
 -	@echo ',("Tables next to code", "$(TablesNextToCode)")' >> $@
 -	@echo ',("Leading underscore", "$(LeadingUnderscore)")' >> $@
 -	@echo ',("Use LibFFI", "$(UseLibffiForAdjustors)")' >> $@
  	@echo ',("RTS expects libdw", "$(GhcRtsWithLibdw)")' >> $@
  	@echo ',("Relative Global Package DB", "package.conf.d")' >> $@
  	@echo ',("base unit-id", "$(BaseUnitId)")' >> $@
  	@echo "]" >> $@
 +lib/targets/default.target : config.mk default.target
 +	@rm -f $@
 +	@echo "Copying the bindist-configured default.target to lib/targets/default.target"
 +	cp default.target $@
++
  # We need to install binaries relative to libraries.
  BINARIES = $(wildcard ./bin/*)
  .PHONY: install_bin_libdir
@@ -167,7 +122,7 @@ install_bin_direct:
  	$(INSTALL_PROGRAM) ./bin/* "$(DESTDIR)$(WrapperBinsDir)/"
  .PHONY: install_lib
 -install_lib: lib/settings
 +install_lib: lib/settings lib/targets/default.target
  	@echo "Copying libraries to $(DESTDIR)$(ActualLibsDir)"
  	$(INSTALL_DIR) "$(DESTDIR)$(ActualLibsDir)"

hadrian/bindist/config.mk.in

@@ -133,7 +133,7 @@ INSTALL_DIR     = $(INSTALL) -m 755 -d
  CrossCompiling        = @CrossCompiling@
  CrossCompilePrefix    = @CrossCompilePrefix@
  GhcUnregisterised     = @Unregisterised@
 -EnableDistroToolchain = @SettingsUseDistroMINGW@
 +EnableDistroToolchain = @EnableDistroToolchain@
  BaseUnitId            = @BaseUnitId@
  # The THREADED_RTS requires `BaseReg` to be in a register and the
@@ -205,31 +205,3 @@ TargetHasLibm = @TargetHasLibm@
  TablesNextToCode = @TablesNextToCode@
  LeadingUnderscore = @LeadingUnderscore@
  LlvmTarget = @LlvmTarget@
+-
 -SettingsCCompilerCommand = @SettingsCCompilerCommand@
 -SettingsCxxCompilerCommand = @SettingsCxxCompilerCommand@
 -SettingsCPPCommand = @SettingsCPPCommand@
 -SettingsCPPFlags = @SettingsCPPFlags@
 -SettingsHaskellCPPCommand = @SettingsHaskellCPPCommand@
 -SettingsHaskellCPPFlags = @SettingsHaskellCPPFlags@
 -SettingsJavaScriptCPPCommand = @SettingsJavaScriptCPPCommand@
 -SettingsJavaScriptCPPFlags = @SettingsJavaScriptCPPFlags@
 -SettingsCmmCPPCommand = @SettingsCmmCPPCommand@
 -SettingsCmmCPPFlags = @SettingsCmmCPPFlags@
 -SettingsCmmCPPSupportsG0 = @SettingsCmmCPPSupportsG0@
 -SettingsCCompilerFlags = @SettingsCCompilerFlags@
 -SettingsCxxCompilerFlags = @SettingsCxxCompilerFlags@
 -SettingsCCompilerLinkFlags = @SettingsCCompilerLinkFlags@
 -SettingsCCompilerSupportsNoPie = @SettingsCCompilerSupportsNoPie@
 -SettingsMergeObjectsCommand = @SettingsMergeObjectsCommand@
 -SettingsMergeObjectsFlags = @SettingsMergeObjectsFlags@
 -SettingsArCommand = @SettingsArCommand@
 -SettingsOtoolCommand = @SettingsOtoolCommand@
 -SettingsInstallNameToolCommand = @SettingsInstallNameToolCommand@
 -SettingsRanlibCommand = @SettingsRanlibCommand@
 -SettingsWindresCommand = @SettingsWindresCommand@
 -SettingsLibtoolCommand = @SettingsLibtoolCommand@
 -SettingsLlcCommand = @SettingsLlcCommand@
 -SettingsOptCommand = @SettingsOptCommand@
 -SettingsLlvmAsCommand = @SettingsLlvmAsCommand@
 -SettingsUseDistroMINGW = @SettingsUseDistroMINGW@

hadrian/cfg/system.config.in

@@ -79,7 +79,7 @@ project-git-commit-id  = @ProjectGitCommitId@
  # generated by configure, to generated being by the build system. Many of these
  # might become redundant.
  # See Note [tooldir: How GHC finds mingw on Windows]
 -settings-use-distro-mingw = @SettingsUseDistroMINGW@
 +settings-use-distro-mingw = @EnableDistroToolchain@
  target-has-libm = @TargetHasLibm@

hadrian/src/Base.hs

@@ -151,6 +151,7 @@ ghcLibDeps stage iplace = do
          , "llvm-passes"
          , "ghc-interp.js"
          , "settings"
 +        , "targets" -/- "default.target"
          , "ghc-usage.txt"
          , "ghci-usage.txt"
          , "dyld.mjs"

hadrian/src/Rules/Generate.hs

@@ -10,7 +10,7 @@ import qualified Data.Set as Set
  import Base
  import qualified Context
  import Expression
 -import Hadrian.Oracles.TextFile (lookupSystemConfig)
 +import Hadrian.Oracles.TextFile (lookupSystemConfig, getTargetTarget)
  import Oracles.Flag hiding (arSupportsAtFile, arSupportsDashL)
  import Oracles.ModuleFiles
  import Oracles.Setting
@@ -24,7 +24,6 @@ import Target
  import Utilities
  import GHC.Toolchain as Toolchain hiding (HsCpp(HsCpp))
 -import GHC.Toolchain.Program
  import GHC.Platform.ArchOS
  import Settings.Program (ghcWithInterpreter)
@@ -263,6 +262,7 @@ generateRules = do
          let prefix = root -/- stageString stage -/- "lib"
              go gen file = generate file (semiEmptyTarget (succStage stage)) gen
          (prefix -/- "settings") %> \out -> go (generateSettings out) out
 +        (prefix -/- "targets" -/- "default.target") %> \out -> go (show <$> expr getTargetTarget) out
    where
      file <~+ gen = file %> \out -> generate out emptyTarget gen >> makeExecutable out
@@ -425,7 +425,7 @@ bindistRules = do
      , interpolateSetting "LlvmMinVersion" LlvmMinVersion
      , interpolateVar "LlvmTarget" $ getTarget tgtLlvmTarget
      , interpolateSetting "ProjectVersion" ProjectVersion
 -    , interpolateVar "SettingsUseDistroMINGW" $ lookupSystemConfig "settings-use-distro-mingw"
 +    , interpolateVar "EnableDistroToolchain" $ lookupSystemConfig "settings-use-distro-mingw"
      , interpolateVar "TablesNextToCode" $ yesNo <$> getTarget tgtTablesNextToCode
      , interpolateVar "TargetHasLibm" $ lookupSystemConfig "target-has-libm"
      , interpolateVar "TargetPlatform" $ getTarget targetPlatformTriple
@@ -483,62 +483,12 @@ generateSettings settingsFile = do
      let rel_pkg_db = makeRelativeNoSysLink (dropFileName settingsFile) package_db_path
      settings <- traverse sequence $
 -        [ ("C compiler command",   queryTarget ccPath)
 -        , ("C compiler flags",     queryTarget ccFlags)
 -        , ("C++ compiler command", queryTarget cxxPath)
 -        , ("C++ compiler flags",   queryTarget cxxFlags)
 -        , ("C compiler link flags",       queryTarget clinkFlags)
 -        , ("C compiler supports -no-pie", queryTarget linkSupportsNoPie)
 -        , ("CPP command",         queryTarget cppPath)
 -        , ("CPP flags",           queryTarget cppFlags)
 -        , ("Haskell CPP command", queryTarget hsCppPath)
 -        , ("Haskell CPP flags",   queryTarget hsCppFlags)
 -        , ("JavaScript CPP command", queryTarget jsCppPath)
 -        , ("JavaScript CPP flags", queryTarget jsCppFlags)
 -        , ("C-- CPP command", queryTarget cmmCppPath)
 -        , ("C-- CPP flags",   queryTarget cmmCppFlags)
 -        , ("C-- CPP supports -g0", queryTarget cmmCppSupportsG0')
 -        , ("ld supports compact unwind", queryTarget linkSupportsCompactUnwind)
 -        , ("ld supports filelist",       queryTarget linkSupportsFilelist)
 -        , ("ld supports single module",       queryTarget linkSupportsSingleModule)
 -        , ("ld is GNU ld",               queryTarget linkIsGnu)
 -        , ("Merge objects command", queryTarget mergeObjsPath)
 -        , ("Merge objects flags", queryTarget mergeObjsFlags)
 -        , ("Merge objects supports response files", queryTarget mergeObjsSupportsResponseFiles')
 -        , ("ar command",          queryTarget arPath)
 -        , ("ar flags",            queryTarget arFlags)
 -        , ("ar supports at file", queryTarget arSupportsAtFile')
 -        , ("ar supports -L",      queryTarget arSupportsDashL')
 -        , ("ranlib command",      queryTarget ranlibPath)
 -        , ("otool command",       queryTarget otoolPath)
 -        , ("install_name_tool command", queryTarget installNameToolPath)
 -        , ("windres command", queryTarget (maybe "/bin/false" prgPath . tgtWindres)) -- TODO: /bin/false is not available on many distributions by default, but we keep it as it were before the ghc-toolchain patch. Fix-me.
 -        , ("unlit command", ("$topdir/../bin/" <>) <$> expr (programName (ctx { Context.package = unlit })))
 -        , ("cross compiling", expr $ yesNo <$> flag CrossCompiling)
 -        , ("target platform string", queryTarget targetPlatformTriple)
 -        , ("target os",        queryTarget (show . archOS_OS . tgtArchOs))
 -        , ("target arch",      queryTarget (show . archOS_arch . tgtArchOs))
 -        , ("target word size", queryTarget wordSize)
 -        , ("target word big endian",       queryTarget isBigEndian)
 -        , ("target has GNU nonexec stack", queryTarget (yesNo . Toolchain.tgtSupportsGnuNonexecStack))
 -        , ("target has .ident directive",  queryTarget (yesNo . Toolchain.tgtSupportsIdentDirective))
 -        , ("target has subsections via symbols", queryTarget (yesNo . Toolchain.tgtSupportsSubsectionsViaSymbols))
 +        [ ("unlit command", ("$topdir/../bin/" <>) <$> expr (programName (ctx { Context.package = unlit })))
          , ("target has libm", expr $  lookupSystemConfig "target-has-libm")
 -        , ("Unregisterised", queryTarget (yesNo . tgtUnregisterised))
 -        , ("LLVM target", queryTarget tgtLlvmTarget)
 -        , ("LLVM llc command", queryTarget llcPath)
 -        , ("LLVM opt command", queryTarget optPath)
 -        , ("LLVM llvm-as command", queryTarget llvmAsPath)
 -        , ("LLVM llvm-as flags", queryTarget llvmAsFlags)
 -        , ("Use inplace MinGW toolchain", expr $ lookupSystemConfig "settings-use-distro-mingw")
+-
          , ("target RTS linker only supports shared libraries", expr $ yesNo <$> targetRTSLinkerOnlySupportsSharedLibs)
          , ("Use interpreter", expr $ yesNo <$> ghcWithInterpreter (predStage stage))
          , ("Support SMP", expr $ yesNo <$> targetSupportsSMP)
          , ("RTS ways", escapeArgs . map show . Set.toList <$> getRtsWays)
 -        , ("Tables next to code", queryTarget (yesNo . tgtTablesNextToCode))
 -        , ("Leading underscore",  queryTarget (yesNo . tgtSymbolsHaveLeadingUnderscore))
 -        , ("Use LibFFI", expr $ yesNo <$> useLibffiForAdjustors)
          , ("RTS expects libdw", yesNo <$> getFlag UseLibdw)
          , ("Relative Global Package DB", pure rel_pkg_db)
          , ("base unit-id", pure base_unit_id)
@@ -550,40 +500,6 @@ generateSettings settingsFile = do
              ("[" ++ showTuple s)
              : ((\s' -> "," ++ showTuple s') <$> ss)
              ++ ["]"]
 -  where
 -    ccPath  = prgPath . ccProgram . tgtCCompiler
 -    ccFlags = escapeArgs . prgFlags . ccProgram . tgtCCompiler
 -    cxxPath  = prgPath . cxxProgram . tgtCxxCompiler
 -    cxxFlags = escapeArgs . prgFlags . cxxProgram . tgtCxxCompiler
 -    clinkFlags = escapeArgs . prgFlags . ccLinkProgram . tgtCCompilerLink
 -    linkSupportsNoPie = yesNo . ccLinkSupportsNoPie . tgtCCompilerLink
 -    cppPath  = prgPath . cppProgram . tgtCPreprocessor
 -    cppFlags = escapeArgs . prgFlags . cppProgram . tgtCPreprocessor
 -    hsCppPath  = prgPath . hsCppProgram . tgtHsCPreprocessor
 -    hsCppFlags = escapeArgs . prgFlags . hsCppProgram . tgtHsCPreprocessor
 -    jsCppPath  = maybe "" (prgPath . jsCppProgram) . tgtJsCPreprocessor
 -    jsCppFlags = maybe "" (escapeArgs . prgFlags . jsCppProgram) . tgtJsCPreprocessor
 -    cmmCppPath  = prgPath . cmmCppProgram . tgtCmmCPreprocessor
 -    cmmCppFlags = escapeArgs . prgFlags . cmmCppProgram . tgtCmmCPreprocessor
 -    cmmCppSupportsG0' = yesNo . cmmCppSupportsG0 . tgtCmmCPreprocessor
 -    mergeObjsPath  = maybe "" (prgPath . mergeObjsProgram) . tgtMergeObjs
 -    mergeObjsFlags = maybe "" (escapeArgs . prgFlags . mergeObjsProgram) . tgtMergeObjs
 -    linkSupportsSingleModule    = yesNo . ccLinkSupportsSingleModule . tgtCCompilerLink
 -    linkSupportsFilelist        = yesNo . ccLinkSupportsFilelist . tgtCCompilerLink
 -    linkSupportsCompactUnwind   = yesNo . ccLinkSupportsCompactUnwind . tgtCCompilerLink
 -    linkIsGnu                   = yesNo . ccLinkIsGnu . tgtCCompilerLink
 -    llcPath = maybe "" prgPath . tgtLlc
 -    optPath = maybe "" prgPath . tgtOpt
 -    llvmAsPath = maybe "" prgPath . tgtLlvmAs
 -    llvmAsFlags = escapeArgs . maybe [] prgFlags . tgtLlvmAs
 -    arPath  = prgPath . arMkArchive . tgtAr
 -    arFlags = escapeArgs . prgFlags . arMkArchive . tgtAr
 -    arSupportsAtFile' = yesNo . arSupportsAtFile . tgtAr
 -    arSupportsDashL' = yesNo . arSupportsDashL . tgtAr
 -    otoolPath = maybe "" prgPath . tgtOtool
 -    installNameToolPath = maybe "" prgPath . tgtInstallNameTool
 -    ranlibPath  = maybe "" (prgPath . ranlibProgram) . tgtRanlib
 -    mergeObjsSupportsResponseFiles' = maybe "NO" (yesNo . mergeObjsSupportsResponseFiles) . tgtMergeObjs
  isBigEndian, wordSize :: Toolchain.Target -> String
  isBigEndian = yesNo . (\case BigEndian -> True; LittleEndian -> False) . tgtEndianness

libraries/ghc-boot/GHC/Settings/Utils.hs

@@ -10,6 +10,8 @@ import GHC.BaseDir
  import GHC.Platform.ArchOS
  import System.FilePath
 +import GHC.Toolchain.Target
++
  maybeRead :: Read a => String -> Maybe a
  maybeRead str = case reads str of
    [(x, "")] -> Just x
@@ -36,19 +38,17 @@ type RawSettings = Map String String
  -- | Read target Arch/OS from the settings
  getTargetArchOS
 -  :: FilePath     -- ^ Settings filepath (for error messages)
 -  -> RawSettings  -- ^ Raw settings file contents
 -  -> Either String ArchOS
 -getTargetArchOS settingsFile settings =
 -  ArchOS <$> readRawSetting settingsFile settings "target arch"
 -         <*> readRawSetting settingsFile settings "target os"
 +  :: Target -- ^ The 'Target' from which to read the 'ArchOS'
 +  -> ArchOS
 +getTargetArchOS target = tgtArchOs target
  getGlobalPackageDb :: FilePath -> RawSettings -> Either String FilePath
  getGlobalPackageDb settingsFile settings = do
    rel_db <- getRawSetting settingsFile settings "Relative Global Package DB"
    return (dropFileName settingsFile </> rel_db)
+-
 +--------------------------------------------------------------------------------
 +-- lib/settings
  getRawSetting
    :: FilePath -> RawSettings -> String -> Either String String
@@ -70,10 +70,3 @@ getRawBooleanSetting settingsFile settings key = do
      "NO" -> Right False
      xs -> Left $ "Bad value for " ++ show key ++ ": " ++ show xs
 -readRawSetting
 -  :: (Show a, Read a) => FilePath -> RawSettings -> String -> Either String a
 -readRawSetting settingsFile settings key = case Map.lookup key settings of
 -  Just xs -> case maybeRead xs of
 -    Just v -> Right v
 -    Nothing -> Left $ "Failed to read " ++ show key ++ " value " ++ show xs
 -  Nothing -> Left $ "No entry for " ++ show key ++ " in " ++ show settingsFile

libraries/ghc-boot/ghc-boot.cabal.in

@@ -82,7 +82,8 @@ Library
                     directory  >= 1.2 && < 1.4,
                     filepath   >= 1.3 && < 1.6,
                     deepseq    >= 1.4 && < 1.6,
 -                   ghc-platform >= 0.1,
 +                   ghc-platform  >= 0.1,
 +                   ghc-toolchain >= 0.1
      -- reexport modules from ghc-boot-th so that packages
      -- don't have to import all of ghc-boot and ghc-boot-th.

libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs

@@ -20,7 +20,7 @@
  module GHC.Internal.ResponseFile (
      getArgsWithResponseFiles,
      unescapeArgs,
 -    escapeArgs,
 +    escapeArgs, escapeArg,
      expandResponse
    ) where

m4/fp_settings.m4 deleted

 -dnl Note [How we configure the bundled windows toolchain]
 -dnl ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 -dnl As per Note [tooldir: How GHC finds mingw on Windows], when using the
 -dnl bundled windows toolchain, the GHC settings file must refer to the
 -dnl toolchain through a path relative to $tooldir (binary distributions on
 -dnl Windows should work without configure, so the paths must be relative to the
 -dnl installation). However, hadrian expects the configured toolchain to use
 -dnl full paths to the executable.
 -dnl
 -dnl This is how the bundled windows toolchain is configured, to define the
 -dnl toolchain with paths to the executables, while still writing into GHC
 -dnl settings the paths relative to $tooldir:
 -dnl
 -dnl * If using the bundled toolchain, FP_SETUP_WINDOWS_TOOLCHAIN will be invoked
 -dnl
 -dnl * FP_SETUP_WINDOWS_TOOLCHAIN will set the toolchain variables to paths
 -dnl   to the bundled toolchain (e.g. CFLAGS=/full/path/to/mingw/bin/gcc)
 -dnl
 -dnl * Later on, in FP_SETTINGS, we substitute occurrences of the path to the
 -dnl   mingw tooldir by $tooldir (see SUBST_TOOLDIR).
 -dnl   The reason is the Settings* variants of toolchain variables are used by the bindist configure to
 -dnl   create the settings file, which needs the windows bundled toolchain to be relative to $tooldir.
 -dnl
 -dnl * Finally, hadrian will also substitute the mingw prefix by $tooldir before writing the toolchain to the settings file (see generateSettings)
 -dnl
 -dnl The ghc-toolchain program isn't concerned with any of these complications:
 -dnl it is passed either the full paths to the toolchain executables, or the bundled
 -dnl mingw path is set first on $PATH before invoking it. And ghc-toolchain
 -dnl will, as always, output target files with full paths to the executables.
 -dnl
 -dnl Hadrian accounts for this as it does for the toolchain executables
 -dnl configured by configure -- in fact, hadrian doesn't need to know whether
 -dnl the toolchain description file was generated by configure or by
 -dnl ghc-toolchain.
+-
 -# SUBST_TOOLDIR
 -# ----------------------------------
 -# $1 - the variable where to search for occurrences of the path to the
 -#      inplace mingw, and update by substituting said occurrences by
 -#      the value of $mingw_install_prefix, where the mingw toolchain will be at
 -#      install time
 -#
 -# See Note [How we configure the bundled windows toolchain]
 -AC_DEFUN([SUBST_TOOLDIR],
 -[
 -    dnl and Note [How we configure the bundled windows toolchain]
 -    $1=`echo "$$1" | sed 's%'"$mingw_prefix"'%'"$mingw_install_prefix"'%g'`
 -])
+-
 -# FP_SETTINGS
 -# ----------------------------------
 -# Set the variables used in the settings file
 -AC_DEFUN([FP_SETTINGS],
 -[
 -    SettingsUseDistroMINGW="$EnableDistroToolchain"
+-
 -    SettingsCCompilerCommand="$CC"
 -    SettingsCCompilerFlags="$CONF_CC_OPTS_STAGE2"
 -    SettingsCxxCompilerCommand="$CXX"
 -    SettingsCxxCompilerFlags="$CONF_CXX_OPTS_STAGE2"
 -    SettingsCPPCommand="$CPPCmd"
 -    SettingsCPPFlags="$CONF_CPP_OPTS_STAGE2"
 -    SettingsHaskellCPPCommand="$HaskellCPPCmd"
 -    SettingsHaskellCPPFlags="$HaskellCPPArgs"
 -    SettingsJavaScriptCPPCommand="$JavaScriptCPPCmd"
 -    SettingsJavaScriptCPPFlags="$JavaScriptCPPArgs"
 -    SettingsCmmCPPCommand="$CmmCPPCmd"
 -    SettingsCmmCPPFlags="$CmmCPPArgs"
 -    SettingsCCompilerLinkFlags="$CONF_GCC_LINKER_OPTS_STAGE2"
 -    SettingsArCommand="$ArCmd"
 -    SettingsRanlibCommand="$RanlibCmd"
 -    SettingsMergeObjectsCommand="$MergeObjsCmd"
 -    SettingsMergeObjectsFlags="$MergeObjsArgs"
+-
 -    AS_CASE(
 -      ["$CmmCPPSupportsG0"],
 -      [True], [SettingsCmmCPPSupportsG0=YES],
 -      [False], [SettingsCmmCPPSupportsG0=NO],
 -      [AC_MSG_ERROR(Unknown CPPSupportsG0 value $CmmCPPSupportsG0)]
 -    )
+-
 -    if test -z "$WindresCmd"; then
 -        SettingsWindresCommand="/bin/false"
 -    else
 -        SettingsWindresCommand="$WindresCmd"
 -    fi
+-
 -    # LLVM backend tools
 -    SettingsLlcCommand="$LlcCmd"
 -    SettingsOptCommand="$OptCmd"
 -    SettingsLlvmAsCommand="$LlvmAsCmd"
 -    SettingsLlvmAsFlags="$LlvmAsFlags"
+-
 -    if test "$EnableDistroToolchain" = "YES"; then
 -        # If the user specified --enable-distro-toolchain then we just use the
 -        # executable names, not paths.
 -        SettingsCCompilerCommand="$(basename $SettingsCCompilerCommand)"
 -        SettingsHaskellCPPCommand="$(basename $SettingsHaskellCPPCommand)"
 -        SettingsCmmCPPCommand="$(basename $SettingsCmmCPPCommand)"
 -        SettingsJavaScriptCPPCommand="$(basename $SettingsJavaScriptCPPCommand)"
 -        SettingsLdCommand="$(basename $SettingsLdCommand)"
 -        SettingsMergeObjectsCommand="$(basename $SettingsMergeObjectsCommand)"
 -        SettingsArCommand="$(basename $SettingsArCommand)"
 -        SettingsWindresCommand="$(basename $SettingsWindresCommand)"
 -        SettingsLlcCommand="$(basename $SettingsLlcCommand)"
 -        SettingsOptCommand="$(basename $SettingsOptCommand)"
 -        SettingsLlvmAsCommand="$(basename $SettingsLlvmAsCommand)"
 -    fi
+-
 -    if test "$windows" = YES -a "$EnableDistroToolchain" = "NO"; then
 -        # Handle the Windows toolchain installed in FP_SETUP_WINDOWS_TOOLCHAIN.
 -        # We need to issue a substitution to use $tooldir,
 -        # See Note [tooldir: How GHC finds mingw on Windows]
 -        SUBST_TOOLDIR([SettingsCCompilerCommand])
 -        SUBST_TOOLDIR([SettingsCCompilerFlags])
 -        SUBST_TOOLDIR([SettingsCxxCompilerCommand])
 -        SUBST_TOOLDIR([SettingsCxxCompilerFlags])
 -        SUBST_TOOLDIR([SettingsCCompilerLinkFlags])
 -        SUBST_TOOLDIR([SettingsCPPCommand])
 -        SUBST_TOOLDIR([SettingsCPPFlags])
 -        SUBST_TOOLDIR([SettingsHaskellCPPCommand])
 -        SUBST_TOOLDIR([SettingsHaskellCPPFlags])
 -        SUBST_TOOLDIR([SettingsCmmCPPCommand])
 -        SUBST_TOOLDIR([SettingsCmmCPPFlags])
 -        SUBST_TOOLDIR([SettingsJavaScriptCPPCommand])
 -        SUBST_TOOLDIR([SettingsJavaScriptCPPFlags])
 -        SUBST_TOOLDIR([SettingsMergeObjectsCommand])
 -        SUBST_TOOLDIR([SettingsMergeObjectsFlags])
 -        SUBST_TOOLDIR([SettingsArCommand])
 -        SUBST_TOOLDIR([SettingsRanlibCommand])
 -        SUBST_TOOLDIR([SettingsWindresCommand])
 -        SUBST_TOOLDIR([SettingsLlcCommand])
 -        SUBST_TOOLDIR([SettingsOptCommand])
 -        SUBST_TOOLDIR([SettingsLlvmAsCommand])
 -        SUBST_TOOLDIR([SettingsLlvmAsFlags])
 -    fi
+-
 -    # Mac-only tools
 -    SettingsOtoolCommand="$OtoolCmd"
 -    SettingsInstallNameToolCommand="$InstallNameToolCmd"
+-
 -    SettingsCCompilerSupportsNoPie="$CONF_GCC_SUPPORTS_NO_PIE"
+-
 -    AC_SUBST(SettingsCCompilerCommand)
 -    AC_SUBST(SettingsCxxCompilerCommand)
 -    AC_SUBST(SettingsCPPCommand)
 -    AC_SUBST(SettingsCPPFlags)
 -    AC_SUBST(SettingsHaskellCPPCommand)
 -    AC_SUBST(SettingsHaskellCPPFlags)
 -    AC_SUBST(SettingsCmmCPPCommand)
 -    AC_SUBST(SettingsCmmCPPFlags)
 -    AC_SUBST(SettingsCmmCPPSupportsG0)
 -    AC_SUBST(SettingsJavaScriptCPPCommand)
 -    AC_SUBST(SettingsJavaScriptCPPFlags)
 -    AC_SUBST(SettingsCCompilerFlags)
 -    AC_SUBST(SettingsCxxCompilerFlags)
 -    AC_SUBST(SettingsCCompilerLinkFlags)
 -    AC_SUBST(SettingsCCompilerSupportsNoPie)
 -    AC_SUBST(SettingsMergeObjectsCommand)
 -    AC_SUBST(SettingsMergeObjectsFlags)
 -    AC_SUBST(SettingsArCommand)
 -    AC_SUBST(SettingsRanlibCommand)
 -    AC_SUBST(SettingsOtoolCommand)
 -    AC_SUBST(SettingsInstallNameToolCommand)
 -    AC_SUBST(SettingsWindresCommand)
 -    AC_SUBST(SettingsLlcCommand)
 -    AC_SUBST(SettingsOptCommand)
 -    AC_SUBST(SettingsLlvmAsCommand)
 -    AC_SUBST(SettingsLlvmAsFlags)
 -    AC_SUBST(SettingsUseDistroMINGW)
 -])

m4/fp_setup_windows_toolchain.m4

@@ -77,6 +77,7 @@ AC_DEFUN([FP_INSTALL_WINDOWS_TOOLCHAIN],[
  # $2 the location that the windows toolchain will be installed in relative to the libdir
  AC_DEFUN([FP_SETUP_WINDOWS_TOOLCHAIN],[
 +    # TODO: UPDATE COMMENT
      # N.B. The parameters which get plopped in the `settings` file used by the
      # resulting compiler are computed in `FP_SETTINGS`. Specifically, we use
      # $$topdir-relative paths instead of fullpaths to the toolchain, by replacing

m4/subst_tooldir.m4

 +dnl Note [How we configure the bundled windows toolchain]
 +dnl ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 +dnl As per Note [tooldir: How GHC finds mingw on Windows], when using the
 +dnl bundled windows toolchain, the GHC settings file must refer to the
 +dnl toolchain through a path relative to $tooldir (binary distributions on
 +dnl Windows should work without configure, so the paths must be relative to the
 +dnl installation). However, hadrian expects the configured toolchain to use
 +dnl full paths to the executable.
 +dnl
 +dnl This is how the bundled windows toolchain is configured, to define the
 +dnl toolchain with paths to the executables, while still writing into GHC
 +dnl settings the paths relative to $tooldir:
 +dnl
 +dnl * If using the bundled toolchain, FP_SETUP_WINDOWS_TOOLCHAIN will be invoked
 +dnl
 +dnl * FP_SETUP_WINDOWS_TOOLCHAIN will set the toolchain variables to paths
 +dnl   to the bundled toolchain (e.g. CFLAGS=/full/path/to/mingw/bin/gcc)
 +dnl
 +dnl * Later on, at the end of distrib/configure.ac, we substitute occurrences of the path to the
 +dnl   mingw tooldir by $tooldir (see SUBST_TOOLDIR).
 +dnl   The reason is the Settings* variants of toolchain variables are used by the bindist configure to
 +dnl   create the settings file, which needs the windows bundled toolchain to be relative to $tooldir.
 +dnl
 +dnl The ghc-toolchain program isn't concerned with any of these complications:
 +dnl it is passed either the full paths to the toolchain executables, or the bundled
 +dnl mingw path is set first on $PATH before invoking it. And ghc-toolchain
 +dnl will, as always, output target files with full paths to the executables.
 +dnl
 +dnl Hadrian accounts for this as it does for the toolchain executables
 +dnl configured by configure -- in fact, hadrian doesn't need to know whether
 +dnl the toolchain description file was generated by configure or by
 +dnl ghc-toolchain.
++
 +# SUBST_TOOLDIR
 +# ----------------------------------
 +# $1 - the filepath where to search for occurrences of the path to the
 +#      inplace mingw, and update by substituting said occurrences by
 +#      the value of $mingw_install_prefix, where the mingw toolchain will be at
 +#      install time
 +#
 +# See Note [How we configure the bundled windows toolchain]
 +AC_DEFUN([SUBST_TOOLDIR],
 +[
 +    sed -i.bkp $1 's%'"$mingw_prefix"'%'"$mingw_install_prefix"'%g'
 +])

mk/hsc2hs.in

 -HSC2HS_C="@SettingsCCompilerFlags@"
 +HSC2HS_C="@CONF_CC_OPTS_STAGE2@"
 -HSC2HS_L="@SettingsCCompilerLinkFlags@"
 +HSC2HS_L="@CONF_GCC_LINKER_OPTS_STAGE2@"
  tflag="--template=$libdir/template-hsc.h"
  Iflag="-I$includedir/include/"

testsuite/tests/ghc-api/T20757.hs

@@ -3,4 +3,4 @@ module Main where
  import GHC.SysTools.BaseDir
  main :: IO ()
 -main = findToolDir False "/" >>= print
 +main = findToolDir "/" >>= print

testsuite/tests/ghc-api/settings-escape/T24265.hs

@@ -16,6 +16,13 @@ import System.Environment
  import System.IO (hPutStrLn, stderr)
  import System.Exit (exitWith, ExitCode(ExitFailure))
 +import GHC.Toolchain
 +import GHC.Toolchain.Program
 +import GHC.Toolchain.Tools.Cc
 +import GHC.Toolchain.Tools.Cpp
 +import GHC.Toolchain.Tools.Cxx
 +import GHC.Toolchain.Lens
++
  -- Precondition: this test case must be executed in a directory with a space.
  --
  -- First we get the current settings file and amend it with extra arguments that we *know*
@@ -30,35 +37,29 @@ main :: IO ()
  main = do
    libdir:_args <- getArgs
 -  (rawSettingOpts, originalSettings) <- runGhc (Just libdir) $ do
 +  (rawSettingOpts, rawTargetOpts, originalSettings) <- runGhc (Just libdir) $ do
      dflags <- hsc_dflags <$> getSession
 -    pure (rawSettings dflags, settings dflags)
 +    pure (rawSettings dflags, rawTarget dflags, settings dflags)
    top_dir <- makeAbsolute "./ghc-install-folder/lib with spaces"
 -  let argsWithSpaces = "\"-some option\" -some\\ other"
 -      numberOfExtraArgs = length $ unescapeArgs argsWithSpaces
 -      -- These are all options that can have multiple 'String' or 'Option' values.
 -      -- We explicitly do not add 'C compiler link flags' here, as 'initSettings'
 -      -- already adds the options of "C compiler flags" to this config field.
 -      multipleArguments = Set.fromList
 -        [ "Haskell CPP flags"
 -        , "JavaScript CPP flags"
 -        , "C-- CPP flags"
 -        , "C compiler flags"
 -        , "C++ compiler flags"
 -        , "CPP flags"
 -        , "Merge objects flags"
 +  let argsWithSpaces l = over l (++["-some option", "-some\\ other"])
 +      numberOfExtraArgs = 2
 +      -- Test it on a handfull of list of flags
 +      multipleArguments =
 +        [ _tgtHsCpp % _hsCppProg  % _prgFlags -- "Haskell CPP flags"
 +        , _tgtCC    % _ccProgram  % _prgFlags -- "C compiler flags"
 +        , _tgtCxx   % _cxxProgram % _prgFlags -- "C++ compiler flags"
 +        , _tgtCpp   % _cppProg    % _prgFlags -- "CPP flags"
+         ]
 -  let rawSettingOptsWithExtraArgs =
 -        map (\(name, args) -> if Set.member name multipleArguments
 -          then (name, args ++ " " ++ argsWithSpaces)
 -          else (name, args)) rawSettingOpts
 +      targetWithExtraArgs = foldr argsWithSpaces rawTargetOpts multipleArguments
    -- write out the modified settings. We try to keep it legible
    writeFile (top_dir ++ "/settings") $
 -    "[" ++ (intercalate "\n," (map show rawSettingOptsWithExtraArgs)) ++ "]"
 +    "[" ++ (intercalate "\n," (map show rawSettingOpts)) ++ "]"
 +  writeFile (top_dir ++ "/targets/default.target") $
 +    show targetWithExtraArgs
    settingsm <- runExceptT $ initSettings top_dir
@@ -113,12 +114,6 @@ main = do
        -- Setting 'Haskell CPP flags' contains '$topdir' reference.
        -- Resolving those while containing spaces, should not introduce more options.
        recordSetting "Haskell CPP flags" (map showOpt . snd . toolSettings_pgm_P . sToolSettings)
 -      -- Setting 'JavaScript CPP flags' contains '$topdir' reference.
 -      -- Resolving those while containing spaces, should not introduce more options.
 -      recordSetting "JavaScript CPP flags" (map showOpt . snd . toolSettings_pgm_JSP . sToolSettings)
 -      -- Setting 'C-- CPP flags' contains '$topdir' reference.
 -      -- Resolving those while containing spaces, should not introduce more options.
 -      recordSetting "C-- CPP flags" (map showOpt . snd . toolSettings_pgm_CmmP . sToolSettings)
        -- Setting 'C compiler flags' contains strings with spaces.
        -- GHC should not split these by word.
        recordSetting "C compiler flags" (toolSettings_opt_c . sToolSettings)
@@ -133,10 +128,6 @@ main = do
        -- Setting 'CPP flags' contains strings with spaces.
        -- GHC should not split these by word.
        recordSetting "CPP flags" (map showOpt . snd . toolSettings_pgm_cpp . sToolSettings)
 -      -- Setting 'Merge objects flags' contains strings with spaces.
 -      -- GHC should not split these by word.
 -      -- If 'Nothing', ignore this test, otherwise the same assertion holds as before.
 -      recordSettingM "Merge objects flags" (fmap (map showOpt . snd) . toolSettings_pgm_lm . sToolSettings)
        -- Setting 'C compiler command' contains '$topdir' reference.
        -- Spaces in the final filepath should not be escaped.
        recordFpSetting "C compiler" (toolSettings_pgm_c . sToolSettings)

testsuite/tests/ghc-api/settings-escape/T24265.stderr

  === 'Haskell CPP flags' contains 2 new entries: True
      Contains spaces: True
 -=== 'JavaScript CPP flags' contains 2 new entries: True
 -    Contains spaces: True
 -=== 'C-- CPP flags' contains 2 new entries: True
 -    Contains spaces: True
  === 'C compiler flags' contains 2 new entries: True
      Contains spaces: True
  === 'C compiler link flags' contains 2 new entries: True
@@ -12,5 +8,4 @@
      Contains spaces: True
  === 'CPP flags' contains 2 new entries: True
      Contains spaces: True
 -=== 'Merge objects flags' contains expected entries: True
  === FilePath 'C compiler' contains escaped spaces: False

testsuite/tests/ghc-api/settings-escape/ghc-install-folder/lib with spaces/targets/.gitkeep

utils/ghc-pkg/Main.hs

@@ -96,6 +96,8 @@ import System.Posix hiding (fdToHandle)
  import qualified System.Info(os)
  #endif
 +import GHC.Toolchain.Target
++
  -- | Short-circuit 'any' with a \"monadic predicate\".
  anyM :: (Monad m) => (a -> m Bool) -> [a] -> m Bool
  anyM _ [] = return False
@@ -583,9 +585,20 @@ readFromSettingsFile settingsFile f = do
        -- It's excusable to not have a settings file (for now at
        -- least) but completely inexcusable to have a malformed one.
        Nothing -> Left $ "Can't parse settings file " ++ show settingsFile
 -    case f settingsFile mySettings of
 -      Right archOS -> Right archOS
 -      Left e -> Left e
 +    f settingsFile mySettings
++
 +readFromTargetFile :: FilePath
 +                   -> (Target -> b)
 +                   -> IO (Either String b)
 +readFromTargetFile targetFile f = do
 +  targetStr <- readFile targetFile
 +  pure $ do
 +    target <- case maybeReadFuzzy targetStr of
 +      Just t -> Right t
 +      -- It's excusable to not have a settings file (for now at
 +      -- least) but completely inexcusable to have a malformed one.
 +      Nothing -> Left $ "Can't parse .target file " ++ show targetFile
 +    Right (f target)
  getPkgDatabases :: Verbosity
                  -> GhcPkg.DbOpenMode mode DbModifySelector
@@ -618,6 +631,7 @@ getPkgDatabases verbosity mode use_user use_cache expand_vars my_flags = do
                     Nothing  -> die err_msg
                     Just dir -> do
                       -- Look for where it is given in the settings file, if marked there.
 +                     -- See Note [Settings file] about this file, and why we need GHC to share it with us.
                       let settingsFile = dir </> "settings"
                       exists_settings_file <- doesFileExist settingsFile
                       erel_db <-
@@ -652,16 +666,15 @@ getPkgDatabases verbosity mode use_user use_cache expand_vars my_flags = do
      case [ f | FlagUserConfig f <- my_flags ] of
        _ | no_user_db -> return Nothing
        [] -> do
 -        -- See Note [Settings file] about this file, and why we need GHC to share it with us.
 -        let settingsFile = top_dir </> "settings"
 -        exists_settings_file <- doesFileExist settingsFile
 +        let targetFile = top_dir </> "targets" </> "default.target"
 +        exists_settings_file <- doesFileExist targetFile
          targetArchOS <- case exists_settings_file of
            False -> do
 -            warn $ "WARNING: settings file doesn't exist " ++ show settingsFile
 +            warn $ "WARNING: target file doesn't exist " ++ show targetFile
              warn "cannot know target platform so guessing target == host (native compiler)."
              pure hostPlatformArchOS
            True ->
 -            readFromSettingsFile settingsFile getTargetArchOS >>= \case
 +            readFromTargetFile targetFile getTargetArchOS >>= \case
                Right v -> pure v
                Left e -> die e

utils/ghc-pkg/ghc-pkg.cabal.in

@@ -29,6 +29,7 @@ Executable ghc-pkg
                     Cabal-syntax,
                     binary,
                     ghc-boot,
 +                   ghc-toolchain,
                     bytestring
      if !os(windows)
          Build-Depends: unix

utils/ghc-toolchain/exe/Main.hs

...	...	@@ -534,4 +534,3 @@ mkTarget opts = do
534	534	}
535	535	return t
536	536
537		---- ROMES:TODO: fp_settings.m4 in general which I don't think was ported completely (e.g. the basenames and windows llvm-XX and such)

utils/ghc-toolchain/src/GHC/Toolchain/Target.hs

@@ -7,6 +7,9 @@ module GHC.Toolchain.Target
    , WordSize(..), wordSize2Bytes
 +    -- ** Lenses
 +  , _tgtCC, _tgtCxx, _tgtCpp, _tgtHsCpp
++
      -- * Re-exports
    , ByteOrder(..)
    ) where
@@ -137,3 +140,29 @@ instance Show Target where
      , ", tgtInstallNameTool = " ++ show tgtInstallNameTool
      , "}"
+     ]
++
 +--------------------------------------------------------------------------------
 +-- Lenses
 +--------------------------------------------------------------------------------
++
 +_tgtCC :: Lens Target Cc
 +_tgtCC = Lens tgtCCompiler (\x o -> o {tgtCCompiler = x})
++
 +_tgtCxx :: Lens Target Cxx
 +_tgtCxx = Lens tgtCxxCompiler (\x o -> o {tgtCxxCompiler = x})
++
 +_tgtCpp :: Lens Target Cpp
 +_tgtCpp = Lens tgtCPreprocessor (\x o -> o {tgtCPreprocessor = x})
++
 +_tgtHsCpp :: Lens Target HsCpp
 +_tgtHsCpp = Lens tgtHsCPreprocessor (\x o -> o {tgtHsCPreprocessor = x})
++
 +_tgtJsCpp :: Lens Target (Maybe JsCpp)
 +_tgtJsCpp = Lens tgtJsCPreprocessor (\x o -> o {tgtJsCPreprocessor = x})
++
 +_tgtCmmCpp :: Lens Target CmmCpp
 +_tgtCmmCpp = Lens tgtCmmCPreprocessor (\x o -> o {tgtCmmCPreprocessor = x})
++
 +_tgtMergeObjs :: Lens Target (Maybe MergeObjs)
 +_tgtMergeObjs = Lens tgtMergeObjs (\x o -> o {tgtMergeObjs = x})
++

utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cpp.hs

@@ -5,6 +5,9 @@ module GHC.Toolchain.Tools.Cpp
    , Cpp(..), findCpp
    , JsCpp(..), findJsCpp
    , CmmCpp(..), findCmmCpp
++
 +    -- * Lenses
 +  , _cppProg, _hsCppProg, _jsCppProg, _cmmCppProg
    ) where
  import Control.Monad
@@ -188,3 +191,18 @@ findCpp progOpt cc = checking "for C preprocessor" $ do
    let cppProgram = addFlagIfNew "-E" cpp2
    return Cpp{cppProgram}
 +--------------------------------------------------------------------------------
 +-- Lenses
 +--------------------------------------------------------------------------------
++
 +_cppProg :: Lens Cpp Program
 +_cppProg = Lens cppProgram (\x o -> o{cppProgram = x})
++
 +_hsCppProg :: Lens HsCpp Program
 +_hsCppProg = Lens hsCppProgram (\x o -> o{hsCppProgram = x})
++
 +_jsCppProg :: Lens JsCpp Program
 +_jsCppProg = Lens jsCppProgram (\x o -> o{jsCppProgram = x})
++
 +_cmmCppProg :: Lens CmmCpp Program
 +_cmmCppProg = Lens cmmCppProgram (\x o -> o{cmmCppProgram = x})

utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cxx.hs

@@ -4,7 +4,7 @@ module GHC.Toolchain.Tools.Cxx
      ( Cxx(..)
      , findCxx
        -- * Helpful utilities
 -    , compileCxx
 +    , compileCxx, _cxxProgram
      ) where
  import System.FilePath