Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC Commits: a8a94aad by Cheng Shao at 2026-01-05T16:24:04-05:00 hadrian: drops unused PE linker script for windows This patch drops unused PE linker script for windows in the `MergeObjects` builder of hadrian. The linker script is used for merging object files into a single `HS*.o` object file and undoing the effect of split sections, when building the "ghci library" object file. However, we don't build the ghci library on windows, and this code path is actually unreachable. - - - - - 53038ea9 by Cheng Shao at 2026-01-05T16:24:04-05:00 hadrian: drop unused logic for building ghci libraries This patch drops the unused logic for building ghci libraries in hadrian: - The term "ghci library" refers to an optional object file per library `HS*.o`, which is merged from multiple object files in that library using the `MergeObjects` builder in hadrian. - The original rationale of having a ghci library object, in addition to normal archives, was to speedup ghci loading, since the combined object is linked with a linker script to undo the effects of `-fsplit-sections` to reduce section count and make it easier for the RTS linker to handle. - However, most GHC builds enable `dynamicGhcPrograms` by default, in such cases the ghci library would already not be built. - `dynamicGhcPrograms` is disabled on Windows, but still we don't build the ghci library due to lack of functioning merge objects command. - The only case that we actually build ghci library objects, are alpine fully static bindists. However, for other reasons, split sections is already disabled for fully static builds anyway! - There will not be any regression if the ghci library objects are absent from a GHC global libdir when `dynamicGhcPrograms` is disabled. The RTS linker can already load the archives without any issue. Hence the removal. We now forcibly disable ghci libraries for all Cabal components, and rip out all logic related to `MergeObjects` and ghci libraries in hadrian. This also nicely cleans up some old todos and fixmes that are no longer relevant. Note that MergeObjects in hadrian is not the same thing as merge objects in the GHC driver. The latter is not affected by this patch. ------------------------- Metric Decrease: libdir ------------------------- Co-authored-by: Codex - - - - - 17 changed files: - − driver/utils/merge_sections.ld - − driver/utils/merge_sections_pe.ld - hadrian/hadrian.cabal - hadrian/src/Builder.hs - hadrian/src/Context.hs - hadrian/src/Hadrian/Haskell/Cabal/Parse.hs - hadrian/src/Hadrian/Haskell/Cabal/Type.hs - hadrian/src/Hadrian/Haskell/Hash.hs - hadrian/src/Oracles/Flag.hs - hadrian/src/Rules.hs - hadrian/src/Rules/Library.hs - hadrian/src/Rules/Register.hs - hadrian/src/Settings/Builders/Cabal.hs - − hadrian/src/Settings/Builders/MergeObjects.hs - hadrian/src/Settings/Builders/SplitSections.hs - hadrian/src/Settings/Default.hs - hadrian/src/Settings/Packages.hs Changes: ===================================== driver/utils/merge_sections.ld deleted ===================================== @@ -1,26 +0,0 @@ -/* Linker script to undo -split-sections and merge all sections together when - * linking relocatable object files for GHCi. - * ld -r normally retains the individual sections, which is what you would want - * if the intention is to eventually link into a binary with --gc-sections, but - * it doesn't have a flag for directly doing what we want. */ -SECTIONS -{ - .text : { - *(.text*) - } - .rodata.cst16 : { - *(.rodata.cst16*) - } - .rodata : { - *(.rodata*) - } - .data.rel.ro : { - *(.data.rel.ro*) - } - .data : { - *(.data*) - } - .bss : { - *(.bss*) - } -} ===================================== driver/utils/merge_sections_pe.ld deleted ===================================== @@ -1,26 +0,0 @@ -/* Linker script to undo -split-sections and merge all sections together when - * linking relocatable object files for GHCi. - * ld -r normally retains the individual sections, which is what you would want - * if the intention is to eventually link into a binary with --gc-sections, but - * it doesn't have a flag for directly doing what we want. */ -SECTIONS -{ - .text : { - *(.text$*) - } - .rdata : { - *(.rdata$*) - } - .data : { - *(.data$*) - } - .pdata : { - *(.pdata$*) - } - .xdata : { - *(.xdata$*) - } - .bss : { - *(.bss$*) - } -} ===================================== hadrian/hadrian.cabal ===================================== @@ -115,7 +115,6 @@ executable hadrian , Settings.Builders.Ar , Settings.Builders.Ld , Settings.Builders.Make - , Settings.Builders.MergeObjects , Settings.Builders.SplitSections , Settings.Builders.RunTest , Settings.Builders.Win32Tarballs ===================================== hadrian/src/Builder.hs ===================================== @@ -178,7 +178,6 @@ data Builder = Alex | Ld Stage --- ^ linker | Make FilePath | Makeinfo - | MergeObjects Stage -- ^ linker to be used to merge object files. | Nm | Objdump | Python @@ -453,15 +452,6 @@ systemBuilderPath builder = case builder of HsCpp -> fromTargetTC "hs-cpp" (Toolchain.hsCppProgram . tgtHsCPreprocessor) JsCpp -> fromTargetTC "js-cpp" (maybeProg Toolchain.jsCppProgram . tgtJsCPreprocessor) Ld _ -> fromTargetTC "ld" (Toolchain.ccLinkProgram . tgtCCompilerLink) - -- MergeObjects Stage0 is a special case in case of - -- cross-compiling. We're building stage1, e.g. code which will be - -- executed on the host and hence we need to use host's merge - -- objects tool and not the target merge object tool. - -- Note, merge object tool is usually platform linker with some - -- parameters. E.g. building a cross-compiler on and for x86_64 - -- which will target ppc64 means that MergeObjects Stage0 will use - -- x86_64 linker and MergeObject _ will use ppc64 linker. - MergeObjects st -> fromStageTC st "merge-objects" (maybeProg Toolchain.mergeObjsProgram . tgtMergeObjs) Make _ -> fromKey "make" Makeinfo -> fromKey "makeinfo" Nm -> fromTargetTC "nm" (Toolchain.nmProgram . tgtNm) ===================================== hadrian/src/Context.hs ===================================== @@ -8,7 +8,7 @@ module Context ( -- * Paths contextDir, buildPath, buildDir, pkgInplaceConfig, pkgSetupConfigFile, pkgSetupConfigDir, pkgHaddockFile, pkgRegisteredLibraryFile, pkgRegisteredLibraryFileName, - pkgLibraryFile, pkgGhciLibraryFile, + pkgLibraryFile, pkgConfFile, pkgStampFile, resourcePath, objectPath, contextPath, getContextPath, libPath, distDir, distDynDir, haddockStatsFilesDir, ensureConfigured, autogenPath, rtsContext, rtsBuildPath, libffiBuildPath @@ -155,13 +155,6 @@ pkgLibraryFile context@Context {..} = do extension <- libsuf stage way pkgFile context "libHS" extension --- | Path to the GHCi library file of a given 'Context', e.g.: --- @_build/stage1/libraries/array/build/HSarray-0.5.1.0.o@. -pkgGhciLibraryFile :: Context -> Action FilePath -pkgGhciLibraryFile context@Context {..} = do - let extension = "" <.> osuf way - pkgFile context "HS" extension - -- | Path to the configuration file of a given 'Context'. pkgConfFile :: Context -> Action FilePath pkgConfFile Context {..} = do ===================================== hadrian/src/Hadrian/Haskell/Cabal/Parse.hs ===================================== @@ -334,7 +334,6 @@ resolveContextData context@Context {..} = do , depIncludeDirs = forDeps Installed.includeDirs , depCcOpts = forDeps Installed.ccOptions , depLdOpts = forDeps Installed.ldOptions - , buildGhciLib = C.withGHCiLib lbi' , frameworks = map C.getSymbolicPath (C.frameworks buildInfo) , packageDescription = pd' , contextLibdir = libdir install_dirs ===================================== hadrian/src/Hadrian/Haskell/Cabal/Type.hs ===================================== @@ -67,7 +67,6 @@ data ContextData = ContextData , depIncludeDirs :: [String] , depCcOpts :: [String] , depLdOpts :: [String] - , buildGhciLib :: Bool , frameworks :: [String] , packageDescription :: PackageDescription ===================================== hadrian/src/Hadrian/Haskell/Hash.hs ===================================== @@ -82,7 +82,6 @@ data PackageHashConfigInputs = PackageHashConfigInputs { pkgHashVanillaLib :: Bool, pkgHashSharedLib :: Bool, pkgHashDynExe :: Bool, - pkgHashGHCiLib :: Bool, pkgHashProfLib :: Bool, pkgHashProfExe :: Bool, pkgHashSplitObjs :: Bool, @@ -139,7 +138,6 @@ pkgHashOracle = void $ addOracleCache $ \(PkgHashKey (stag, pkg)) -> do pkgHashVanillaLib = vanilla `Set.member` libWays pkgHashSharedLib = dynamic `Set.member` libWays pkgHashDynExe = dyn_ghc - pkgHashGHCiLib = False pkgHashProfLib = profiling `Set.member` libWays pkgHashProfExe = pkg == ghc && ghcProfiled flav stag pkgHashSplitObjs = False -- Deprecated @@ -239,7 +237,6 @@ renderPackageHashInputs PackageHashInputs{ , opt "vanilla-lib" True show pkgHashVanillaLib , opt "shared-lib" False show pkgHashSharedLib , opt "dynamic-exe" False show pkgHashDynExe - , opt "ghci-lib" False show pkgHashGHCiLib , opt "prof-lib" False show pkgHashProfLib , opt "prof-exe" False show pkgHashProfExe , opt "split-objs" False show pkgHashSplitObjs ===================================== hadrian/src/Oracles/Flag.hs ===================================== @@ -3,7 +3,6 @@ module Oracles.Flag ( Flag (..), flag, getFlag, platformSupportsSharedLibs, - platformSupportsGhciObjects, targetRTSLinkerOnlySupportsSharedLibs, targetSupportsThreadedRts, targetSupportsSMP, @@ -71,15 +70,6 @@ flag f = do getFlag :: Flag -> Expr c b Bool getFlag = expr . flag --- | Does the platform support object merging (and therefore we can build GHCi objects --- when appropriate). -platformSupportsGhciObjects :: Action Bool --- FIXME: The name of the function is not entirely clear about which platform, it would be better named targetSupportsGhciObjects -platformSupportsGhciObjects = do - has_merge_objs <- isJust <$> queryTargetTarget tgtMergeObjs - only_shared_libs <- targetRTSLinkerOnlySupportsSharedLibs - pure $ has_merge_objs && not only_shared_libs - targetRTSLinkerOnlySupportsSharedLibs :: Action Bool targetRTSLinkerOnlySupportsSharedLibs = queryTargetTarget Toolchain.tgtRTSLinkerOnlySupportsSharedLibs ===================================== hadrian/src/Rules.hs ===================================== @@ -71,16 +71,9 @@ topLevelTargets = action $ do name stage pkg | isLibrary pkg = return (pkgName pkg) | otherwise = programName (vanillaContext stage pkg) --- TODO: Get rid of the @includeGhciLib@ hack. -- | Return the list of targets associated with a given 'Stage' and 'Package'. --- By setting the Boolean parameter to False it is possible to exclude the GHCi --- library from the targets, and avoid configuring the package to determine --- whether GHCi library needs to be built for it. We typically want to set --- this parameter to True, however it is important to set it to False when --- computing 'topLevelTargets', as otherwise the whole build gets sequentialised --- because packages are configured in the order respecting their dependencies. -packageTargets :: Bool -> Stage -> Package -> Action [FilePath] -packageTargets includeGhciLib stage pkg = do +packageTargets :: Stage -> Package -> Action [FilePath] +packageTargets stage pkg = do let context = vanillaContext stage pkg activePackages <- stagePackages stage if pkg `notElem` activePackages @@ -90,7 +83,7 @@ packageTargets includeGhciLib stage pkg = do let pkgWays = if pkg == rts then getRtsWays else getLibraryWays ways <- interpretInContext context pkgWays libs <- mapM (\w -> pkgLibraryFile (Context stage pkg w (error "unused"))) (Set.toList ways) - more <- Rules.Library.libraryTargets includeGhciLib context + more <- Rules.Library.libraryTargets context setupConfig <- pkgSetupConfigFile context return $ [setupConfig] ++ libs ++ more else do -- The only target of a program package is the executable. ===================================== hadrian/src/Rules/Library.hs ===================================== @@ -35,8 +35,6 @@ libraryRules = do root -/- "stage*/lib/**/libHS*-*.so" %> registerDynamicLib root "so" root -/- "stage*/lib/**/libHS*-*.dll" %> registerDynamicLib root "dll" root -/- "stage*/lib/**/*.a" %> registerStaticLib root - root -/- "**/HS*-*.o" %> buildGhciLibO root - root -/- "**/HS*-*.p_o" %> buildGhciLibO root -- * 'Action's for building libraries @@ -100,20 +98,6 @@ buildDynamicLib root suffix dynlibpath = do (quote pkgname ++ " (" ++ show stage ++ ", way " ++ show way ++ ").") dynlibpath synopsis --- | Build a "GHCi library" ('LibGhci') under the given build root, with the --- complete path of the file to build is given as the second argument. --- See Note [Merging object files for GHCi] in GHC.Driver.Pipeline. -buildGhciLibO :: FilePath -> FilePath -> Action () -buildGhciLibO root ghcilibPath = do - l@(BuildPath _ stage _ (LibGhci _ _ _ _)) - <- parsePath (parseBuildLibGhci root) - "<.o ghci lib (build) path parser>" - ghcilibPath - let context = libGhciContext l - objs <- allObjects context - need objs - build $ target context (MergeObjects stage) objs [ghcilibPath] - {- Note [Stamp Files] @@ -145,7 +129,7 @@ buildPackage root fp = do srcs <- hsSources ctx gens <- interpretInContext ctx generatedDependencies - lib_targets <- libraryTargets True ctx + lib_targets <- libraryTargets ctx need (srcs ++ gens ++ lib_targets) @@ -166,10 +150,6 @@ buildPackage root fp = do -- * Helpers --- | Return all Haskell and non-Haskell object files for the given 'Context'. -allObjects :: Context -> Action [FilePath] -allObjects context = (++) <$> nonHsObjects context <*> hsObjects context - -- | Return all the non-Haskell object files for the given library context -- (object files built from C, C-- and sometimes other things). nonHsObjects :: Context -> Action [FilePath] @@ -228,7 +208,7 @@ libraryObjects context = do -- | Coarse-grain 'need': make sure all given libraries are fully built. needLibrary :: [Context] -> Action () -needLibrary cs = need =<< concatMapM (libraryTargets True) cs +needLibrary cs = need =<< concatMapM libraryTargets cs -- * Library paths types and parsers @@ -241,9 +221,6 @@ data DynLibExt = So | Dylib deriving (Eq, Show) -- | > libHS<pkg name>-<pkg version>-<pkg hash>[_<way suffix>]-ghc<ghc version>. data LibDyn = LibDyn String [Integer] String Way DynLibExt deriving (Eq, Show) --- | > HS<pkg name>-<pkg version>-<pkg hash>[_<way suffix>].o -data LibGhci = LibGhci String [Integer] String Way deriving (Eq, Show) - -- | Get the 'Context' corresponding to the build path for a given static library. libAContext :: BuildPath LibA -> Context libAContext (BuildPath _ stage pkgpath (LibA pkgname _ _ way)) = @@ -251,13 +228,6 @@ libAContext (BuildPath _ stage pkgpath (LibA pkgname _ _ way)) = where pkg = library pkgname pkgpath --- | Get the 'Context' corresponding to the build path for a given GHCi library. -libGhciContext :: BuildPath LibGhci -> Context -libGhciContext (BuildPath _ stage pkgpath (LibGhci pkgname _ _ way)) = - Context stage pkg way Final - where - pkg = library pkgname pkgpath - -- | Get the 'Context' corresponding to the build path for a given dynamic library. libDynContext :: BuildPath LibDyn -> Context libDynContext (BuildPath _ stage pkgpath (LibDyn pkgname _ _ way _)) = @@ -274,9 +244,8 @@ stampContext (BuildPath _ stage _ (PkgStamp pkgname _ _ way)) = data PkgStamp = PkgStamp String [Integer] String Way deriving (Eq, Show) - --- | Parse a path to a ghci library to be built, making sure the path starts --- with the given build root. +-- | Parse a path to a package stamp file, making sure the path starts with the +-- given build root. parseStampPath :: FilePath -> Parsec.Parsec String () (BuildPath PkgStamp) parseStampPath root = parseBuildPath root parseStamp @@ -297,12 +266,6 @@ parseBuildLibA :: FilePath -> Parsec.Parsec String () (BuildPath LibA) parseBuildLibA root = parseBuildPath root parseLibAFilename Parsec.<?> "build path for a static library" --- | Parse a path to a ghci library to be built, making sure the path starts --- with the given build root. -parseBuildLibGhci :: FilePath -> Parsec.Parsec String () (BuildPath LibGhci) -parseBuildLibGhci root = parseBuildPath root parseLibGhciFilename - Parsec.<?> "build path for a ghci library" - -- | Parse a path to a dynamic library to be built, making sure the path starts -- with the given build root. parseBuildLibDyn :: FilePath -> String -> Parsec.Parsec String () (BuildPath LibDyn) @@ -324,16 +287,6 @@ parseLibAFilename = do _ <- Parsec.string ".a" return (LibA pkgname pkgver pkghash way) --- | Parse the filename of a ghci library to be built into a 'LibGhci' value. -parseLibGhciFilename :: Parsec.Parsec String () LibGhci -parseLibGhciFilename = do - _ <- Parsec.string "HS" - (pkgname, pkgver, pkghash) <- parsePkgId - _ <- Parsec.string "." - way <- parseWayPrefix vanilla - _ <- Parsec.string "o" - return (LibGhci pkgname pkgver pkghash way) - -- | Parse the filename of a dynamic library to be built into a 'LibDyn' value. parseLibDynFilename :: String -> Parsec.Parsec String () LibDyn parseLibDynFilename ext = do ===================================== hadrian/src/Rules/Register.hs ===================================== @@ -6,20 +6,17 @@ module Rules.Register ( import Base import Context -import Expression ( getContextData ) import Flavour import Oracles.Setting import Hadrian.BuildPath import Hadrian.Expression import Hadrian.Haskell.Cabal -import Oracles.Flag (platformSupportsGhciObjects) import Packages import Rules.Rts import Settings import Target import Utilities -import Hadrian.Haskell.Cabal.Type import qualified Text.Parsec as Parsec import qualified Data.Set as Set import qualified Data.Char as Char @@ -298,17 +295,9 @@ extraTargets context -- | Given a library 'Package' this action computes all of its targets. Needing -- all the targets should build the library such that it is ready to be -- registered into the package database. --- See 'Rules.packageTargets' for the explanation of the @includeGhciLib@ --- parameter. -libraryTargets :: Bool -> Context -> Action [FilePath] -libraryTargets includeGhciLib context@Context {..} = do +libraryTargets :: Context -> Action [FilePath] +libraryTargets context = do libFile <- pkgLibraryFile context - ghciLib <- pkgGhciLibraryFile context - ghciObjsSupported <- platformSupportsGhciObjects - ghci <- if ghciObjsSupported && includeGhciLib && not (wayUnit Dynamic way) - then interpretInContext context $ getContextData buildGhciLib - else return False extra <- extraTargets context return $ [ libFile ] - ++ [ ghciLib | ghci ] ++ extra ===================================== hadrian/src/Settings/Builders/Cabal.hs ===================================== @@ -5,13 +5,12 @@ import Hadrian.Haskell.Cabal import Builder import Context -import Flavour import Packages import Settings.Builders.Common import qualified Settings.Builders.Common as S import Control.Exception (assert) import qualified Data.Set as Set -import Settings.Program (programContext, ghcWithInterpreter) +import Settings.Program (programContext) import GHC.Toolchain (ccLinkProgram, tgtCCompilerLink) import GHC.Toolchain.Program (prgFlags) @@ -128,7 +127,6 @@ commonCabalArgs stage = do ] -- TODO: Isn't vanilla always built? If yes, some conditions are redundant. --- TODO: Need compiler_stage1_CONFIGURE_OPTS += --disable-library-for-ghci? -- TODO: should `elem` be `wayUnit`? -- This approach still doesn't work. Previously libraries were build only in the -- Default flavours and not using context. @@ -136,11 +134,6 @@ libraryArgs :: Args libraryArgs = do flavourWays <- getLibraryWays contextWay <- getWay - package <- getPackage - stage <- getStage - withGhci <- expr $ ghcWithInterpreter stage - dynPrograms <- expr (flavour >>= dynamicGhcPrograms) - ghciObjsSupported <- expr platformSupportsGhciObjects let ways = Set.insert contextWay flavourWays hasVanilla = vanilla `elem` ways hasProfiling = any (wayUnit Profiling) ways @@ -155,11 +148,7 @@ libraryArgs = do , if hasProfilingShared then "--enable-profiling-shared" else "--disable-profiling-shared" - , if ghciObjsSupported && - (hasVanilla || hasProfiling) && - package /= rts && withGhci && not dynPrograms - then "--enable-library-for-ghci" - else "--disable-library-for-ghci" + , "--disable-library-for-ghci" , if hasDynamic then "--enable-shared" else "--disable-shared" ] ===================================== hadrian/src/Settings/Builders/MergeObjects.hs deleted ===================================== @@ -1,11 +0,0 @@ -module Settings.Builders.MergeObjects (mergeObjectsBuilderArgs) where - -import Settings.Builders.Common -import GHC.Toolchain -import GHC.Toolchain.Program - -mergeObjectsBuilderArgs :: Args -mergeObjectsBuilderArgs = builder MergeObjects ? mconcat - [ maybe [] (prgFlags . mergeObjsProgram) . tgtMergeObjs <$> getStagedTarget - , arg "-o", arg =<< getOutput - , getInputs ] ===================================== hadrian/src/Settings/Builders/SplitSections.hs ===================================== @@ -32,8 +32,5 @@ splitSectionsArgs = do , builder (Ghc CompileCWithGhc) ? arg "-fsplit-sections" , builder (Ghc CompileCppWithGhc) ? arg "-fsplit-sections" , builder (Cc CompileC) ? arg "-ffunction-sections" <> arg "-fdata-sections" - , builder MergeObjects ? ifM (expr isWinTarget) - (pure ["-T", "driver/utils/merge_sections_pe.ld"]) - (pure ["-T", "driver/utils/merge_sections.ld"]) ] ) else mempty ===================================== hadrian/src/Settings/Default.hs ===================================== @@ -40,7 +40,6 @@ import Settings.Builders.HsCpp import Settings.Builders.Ar import Settings.Builders.Ld import Settings.Builders.Make -import Settings.Builders.MergeObjects import Settings.Builders.SplitSections import Settings.Builders.RunTest import Settings.Builders.Xelatex @@ -328,7 +327,6 @@ defaultBuilderArgs = mconcat , ldBuilderArgs , arBuilderArgs , makeBuilderArgs - , mergeObjectsBuilderArgs , runTestBuilderArgs , validateBuilderArgs , xelatexBuilderArgs ===================================== hadrian/src/Settings/Packages.hs ===================================== @@ -75,8 +75,7 @@ packageArgs = do pure ["-O0"] ] , builder (Cabal Setup) ? mconcat - [ arg "--disable-library-for-ghci" - , anyTargetOs [OSOpenBSD] ? arg "--ld-options=-E" + [ anyTargetOs [OSOpenBSD] ? arg "--ld-options=-E" , compilerStageOption ghcProfiled ? arg "--ghc-pkg-option=--force" , cabalExtraDirs libzstdIncludeDir libzstdLibraryDir ] View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/b820ff50459fc48bce6db3af652c2e5... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/b820ff50459fc48bce6db3af652c2e5... 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