April 2014 - ghc-tickets

[GHC] #8614: Duplicate symbol error when loading text twice
by GHC 05 Sep '15

05 Sep '15

#8614: Duplicate symbol error when loading text twice ------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: GHCi crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- We are developing some FFI binding to some Kinect Camera library, and came across the following: {{{ GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> import Honi Prelude Honi> import Honi.Types Prelude Honi Honi.Types> initialize 2 Loading package array-0.4.0.1 ... linking ... done. Loading package deepseq-1.3.0.1 ... linking ... done. Loading package bytestring-0.10.0.2 ... linking ... done. Loading package text-0.11.3.1 ... linking ... done. Loading package honi-0.1.0.0 ... can't load .so/.DLL for: libfreenect.so (libfreenect.so: cannot open shared object file: No such file or directory) Prelude Honi Honi.Types> Right [d] <- getDeviceList Loading package array-0.4.0.1 ... linking ... done. Loading package deepseq-1.3.0.1 ... linking ... done. Loading package bytestring-0.10.0.2 ... linking ... done. Loading package text-0.11.3.1 ... GHCi runtime linker: fatal error: I found a duplicate definition for symbol __stginit_textzm0zi11zi3zi1_DataziText whilst processing object file /home/niklas/.cabal/lib/x86_64-linux- ghc-7.6.3/text-0.11.3.1/libHStext-0.11.3.1.a This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. GHCi cannot safely continue in this situation. Exiting now. Sorry. }}} Apparently, ghci has no problem linking packages like array and deepseq twice, but when it comes across loading text another time, we get this duplicate symbol error. Does this make sense? Why does it not detect that text is already linked, like for the other packages? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8614> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8290: lookupSymbol API is unsafe
by GHC 05 Sep '15

05 Sep '15

#8290: lookupSymbol API is unsafe -------------------------------------+------------------------------------- Reporter: ezyang | Owner: Type: task | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: Documentation Difficulty: Easy (less than 1 | bug hour) | Test Case: Blocked By: | Blocking: Related Tickets: | -------------------------------------+------------------------------------- lookupSymbol is one of those functions that looks nice and innocuous on the tin, until you realize actually it doesn't actually do what you want, and seduces you into writing code that doesn't work on Mac OS X. Case in point, this recent test suite commit: {{{ commit 29b0521cd9be39b4026103d184d1fec14ef3bc22 Author: Edward Z. Yang <ezyang(a)mit.edu> Date: Fri Sep 13 20:52:57 2013 -0700 Properly provide leading underscore when necessary. Signed-off-by: Edward Z. Yang <ezyang(a)mit.edu> }}} Yes, the API is "correct" in some sense, but from a portability sense, we really want the function to add the underscore itself. If we change this particular function, we will probably break most dynamic loading code (including GHC's). We could also add a safe variant of the function. We just need to decide something to do. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8290> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8926: GHC makes unsound references in object code
by GHC 05 Sep '15

05 Sep '15

#8926: GHC makes unsound references in object code ----------------------------+---------------------------------------------- Reporter: | Owner: anton.dubovik | Status: new Type: bug | Milestone: Priority: normal | Version: 7.6.3 Component: Compiler | Operating System: Unknown/Multiple Keywords: | Type of failure: GHC rejects valid program Architecture: | Test Case: Unknown/Multiple | Blocking: Difficulty: Unknown | Blocked By: | Related Tickets: | ----------------------------+---------------------------------------------- To reproduce the bug run script `run.sh` from the attached archive. It will: 1. install `FooPackage` {{{ Resolving dependencies... Configuring FooPackage-0.1... Building FooPackage-0.1... Preprocessing library FooPackage-0.1... [1 of 1] Compiling FooPackage ( src\FooPackage.hs, dist\build\FooPackage.o ) In-place registering FooPackage-0.1... Installing library in C:\Users\Anton\AppData\Roaming\cabal\i386-windows- ghc-7.6.3\FooPackage-0.1 Registering FooPackage-0.1... Installed FooPackage-0.1 }}} 2. compile executable `Client1` which depends on `FooPackage` {{{ [1 of 3] Compiling QuxClient ( QuxClient.hs, obj\QuxClient.o ) [2 of 3] Compiling BarClient ( BarClient.hs, obj\BarClient.o ) [3 of 3] Compiling Client1 ( Client1.hs, obj\Client1.o ) Linking exes/Client1.exe ... }}} 3. compile executable `Client2` which doesn't depend on `FooPackage` At the third step GHC will fall with linker error: {{{ [2 of 2] Compiling Client2 ( Client2.hs, obj\Client2.o ) Linking exes/Client2.exe ... obj\BarClient.o:fake:(.text+0x83): undefined reference to `FooPackagezm0zi1_FooPackage_zdsinsertzuzdsgo5_info' obj\BarClient.o:fake:(.data+0x10): undefined reference to `FooPackagezm0zi1_FooPackage_zdsinsertzuzdsgo5_closure' collect2: ld returned 1 exit status }}} Both `Client1` and `Client2` import `BarClient` module that doesn't depends on `FooPackage`. `Client1` imports `QuxClient` that imports `FooPackage`: {{{ module QuxClient where import FooPackage(foo) import Data.Set qux :: Set String -> Set String qux = foo }}} {{{ module BarClient where import Data.Set bar :: Set String -> Set String bar s = insert "bar" s }}} `FooPackage` uses function `Data.Set.insert` which is marked at `Data.Set` as `INLINABLE`: {{{ module FooPackage where import Data.Set foo :: Set String -> Set String foo s = insert "foo" s }}} GHC emphasizes in interface file, that `FooPackage.o` contains specialized version of `Data.Set.insert`: {{{ > ghc --show-iface FooPackage.hi ... "SPEC Data.Set.Base.insert [GHC.Base.String]" [ALWAYS] forall $dOrd :: GHC.Classes.Ord GHC.Base.String Data.Set.Base.insert @ [GHC.Types.Char] $dOrd = FooPackage.$sinsert ... }}} Later GHC see again the use of `Data.Set.insert@String` at `BarClient` and decides to apply this specialise rule, so that `BarClient` now has reference to `FooPackage`: {{{ > ghc --show-iface BarClient.hi ... bar :: Data.Set.Base.Set GHC.Base.String -> Data.Set.Base.Set GHC.Base.String {- Arity: 1, Strictness: S, Unfolding: (\ s :: Data.Set.Base.Set GHC.Base.String -> FooPackage.$sinsert_$sgo5 BarClient.bar1 s) -} ... }}} `Client2` doesn't depend on `FooPackage`, thus linker throws an error. There are plenty of workarounds here, but all of them are ad hoc (1,2,3) or could affect performance (4): 1. Change the order of `BarClient` and `QuxClient` imports in `Client1` module. 2. Compile `Client1` and `Client2` in opposite order. 3. Add fake import at `Client2` module: {{{ import FooPackage() }}} 4. Build `FooPackage` with ghc-option `-fomit-interface-pragmas`. That will eraise from `FooPackage.hi` all specialisation rules as well as information about strictness and inlining. Some information about the environment: {{{ > ghc-pkg list ... containers-0.5.0.0 base-4.6.0.1 ... > ghc --version The Glorious Glasgow Haskell Compilation System, version 7.6.3 > cabal --version cabal-install version 1.18.0.3 using version 1.18.1.3 of the Cabal library }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8926> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8229: Linking in Windows is slow
by GHC 05 Sep '15

05 Sep '15

#8229: Linking in Windows is slow -------------------------+------------------------------------------------- Reporter: | Owner: ezyang | Status: new Type: bug | Milestone: 7.8.1 Priority: | Version: 7.7 normal | Operating System: Windows Component: | Type of failure: Compile-time performance bug Compiler | Test Case: Keywords: | Blocking: Architecture: | Unknown/Multiple | Difficulty: | Unknown | Blocked By: | Related Tickets: | -------------------------+------------------------------------------------- It takes a long time to link ghc-stage2 on Windows; several minutes on what should be a pretty beefy machine. Here is the linker command: {{{ "C:\Users\ezyang\Dev\ghc-validate\inplace\lib/../mingw/bin/gcc.exe" "-U__i686" "-fno-stack-prot ector" "-DTABLES_NEXT_TO_CODE" "-o" "compiler/stage2/build/libHSghc-7.7.20130904-ghc7.7.2013090 4.dll" "-shared" "-Wl,--out- implib=compiler/stage2/build/libHSghc-7.7.20130904-ghc7.7.20130904. dll.a" "-Wl,--enable-auto-import" "compiler\stage2\build\GhcMonad.dyn_o" "compiler\stage2\build \Llvm.dyn_o" "compiler\stage2\build\Llvm\AbsSyn.dyn_o" "compiler\stage2\build\Llvm\MetaData.dyn _o" "compiler\stage2\build\Llvm\PpLlvm.dyn_o" "compiler\stage2\build\Llvm\Types.dyn_o" "compile r\stage2\build\LlvmCodeGen.dyn_o" "compiler\stage2\build\LlvmCodeGen\Base.dyn_o" "compiler\stag e2\build\LlvmCodeGen\CodeGen.dyn_o" "compiler\stage2\build\LlvmCodeGen\Data.dyn_o" "compiler\st age2\build\LlvmCodeGen\Ppr.dyn_o" "compiler\stage2\build\LlvmCodeGen\Regs.dyn_o" "compiler\stag e2\build\LlvmMangler.dyn_o" "compiler\stage2\build\CmmBuildInfoTables.dyn_o" "compiler\stage2\b uild\CmmPipeline.dyn_o" "compiler\stage2\build\CmmCommonBlockElim.dyn_o" "compiler\stage2\build \CmmContFlowOpt.dyn_o" "compiler\stage2\build\CmmLex.dyn_o" "compiler\stage2\build\CmmLint.dyn_ o" "compiler\stage2\build\CmmLive.dyn_o" "compiler\stage2\build\CmmOpt.dyn_o" "compiler\stage2\ build\CmmParse.dyn_o" "compiler\stage2\build\CmmProcPoint.dyn_o" "compiler\stage2\build\CmmRewr iteAssignments.dyn_o" "compiler\stage2\build\CmmSink.dyn_o" "compiler\stage2\build\CmmLayoutSta ck.dyn_o" "compiler\stage2\build\PprBase.dyn_o" "compiler\stage2\build\PprC.dyn_o" "compiler\st age2\build\CgUtils.dyn_o" "compiler\stage2\build\StgCmm.dyn_o" "compiler\stage2\build\StgCmmBin d.dyn_o" "compiler\stage2\build\StgCmmCon.dyn_o" "compiler\stage2\build\StgCmmExpr.dyn_o" "comp iler\stage2\build\StgCmmForeign.dyn_o" "compiler\stage2\build\StgCmmHeap.dyn_o" "compiler\stage 2\build\StgCmmHpc.dyn_o" "compiler\stage2\build\StgCmmPrim.dyn_o" "compiler\stage2\build\StgCmm ExtCode.dyn_o" "compiler\stage2\build\CoreLint.dyn_o" "compiler\stage2\build\CorePrep.dyn_o" "c ompiler\stage2\build\ExternalCore.dyn_o" "compiler\stage2\build\MkExternalCore.dyn_o" "compiler \stage2\build\PprExternalCore.dyn_o" "compiler\stage2\build\Check.dyn_o" "compiler\stage2\build \Coverage.dyn_o" "compiler\stage2\build\Desugar.dyn_o" "compiler\stage2\build\DsArrows.dyn_o" " compiler\stage2\build\DsBinds.dyn_o" "compiler\stage2\build\DsCCall.dyn_o" "compiler\stage2\bui ld\DsExpr.dyn_o" "compiler\stage2\build\DsForeign.dyn_o" "compiler\stage2\build\DsGRHSs.dyn_o" "compiler\stage2\build\DsListComp.dyn_o" "compiler\stage2\build\DsMonad.dyn_o" "compiler\stage2 \build\DsUtils.dyn_o" "compiler\stage2\build\Match.dyn_o" "compiler\stage2\build\MatchCon.dyn_o " "compiler\stage2\build\MatchLit.dyn_o" "compiler\stage2\build\BinIface.dyn_o" "compiler\stage 2\build\BuildTyCl.dyn_o" "compiler\stage2\build\IfaceEnv.dyn_o" "compiler\stage2\build\LoadIfac e.dyn_o" "compiler\stage2\build\MkIface.dyn_o" "compiler\stage2\build\TcIface.dyn_o" "compiler\ stage2\build\FlagChecker.dyn_o" "compiler\stage2\build\CodeOutput.dyn_o" "compiler\stage2\build \DriverMkDepend.dyn_o" "compiler\stage2\build\DriverPipeline.dyn_o" "compiler\stage2\build\Find er.dyn_o" "compiler\stage2\build\GHC.dyn_o" "compiler\stage2\build\GhcMake.dyn_o" "compiler\sta ge2\build\GhcPlugins.dyn_o" "compiler\stage2\build\DynamicLoading.dyn_o" "compiler\stage2\build \HeaderInfo.dyn_o" "compiler\stage2\build\HscMain.dyn_o" "compiler\stage2\build\HscStats.dyn_o" "compiler\stage2\build\InteractiveEval.dyn_o" "compiler\stage2\build\PprTyThing.dyn_o" "compil er\stage2\build\SysTools.dyn_o" "compiler\stage2\build\TidyPgm.dyn_o" "compiler\stage2\build\Ct ype.dyn_o" "compiler\stage2\build\HaddockUtils.dyn_o" "compiler\stage2\build\LexCore.dyn_o" "co mpiler\stage2\build\Lexer.dyn_o" "compiler\stage2\build\Parser.dyn_o" "compiler\stage2\build\Pa rserCore.dyn_o" "compiler\stage2\build\ParserCoreUtils.dyn_o" "compiler\stage2\build\RdrHsSyn.d yn_o" "compiler\stage2\build\PrelInfo.dyn_o" "compiler\stage2\build\ProfInit.dyn_o" "compiler\s tage2\build\SCCfinal.dyn_o" "compiler\stage2\build\RnBinds.dyn_o" "compiler\stage2\build\RnEnv. dyn_o" "compiler\stage2\build\RnExpr.dyn_o" "compiler\stage2\build\RnHsDoc.dyn_o" "compiler\sta ge2\build\RnNames.dyn_o" "compiler\stage2\build\RnPat.dyn_o" "compiler\stage2\build\RnSource.dy n_o" "compiler\stage2\build\RnTypes.dyn_o" "compiler\stage2\build\CoreMonad.dyn_o" "compiler\st age2\build\CSE.dyn_o" "compiler\stage2\build\FloatIn.dyn_o" "compiler\stage2\build\FloatOut.dyn _o" "compiler\stage2\build\LiberateCase.dyn_o" "compiler\stage2\build\SAT.dyn_o" "compiler\stag e2\build\SetLevels.dyn_o" "compiler\stage2\build\SimplCore.dyn_o" "compiler\stage2\build\SimplE nv.dyn_o" "compiler\stage2\build\SimplMonad.dyn_o" "compiler\stage2\build\SimplUtils.dyn_o" "co mpiler\stage2\build\Simplify.dyn_o" "compiler\stage2\build\SimplStg.dyn_o" "compiler\stage2\bui ld\StgStats.dyn_o" "compiler\stage2\build\UnariseStg.dyn_o" "compiler\stage2\build\SpecConstr.d yn_o" "compiler\stage2\build\Specialise.dyn_o" "compiler\stage2\build\CoreToStg.dyn_o" "compile r\stage2\build\StgLint.dyn_o" "compiler\stage2\build\DmdAnal.dyn_o" "compiler\stage2\build\Work Wrap.dyn_o" "compiler\stage2\build\WwLib.dyn_o" "compiler\stage2\build\FamInst.dyn_o" "compiler \stage2\build\Inst.dyn_o" "compiler\stage2\build\TcAnnotations.dyn_o" "compiler\stage2\build\Tc Arrows.dyn_o" "compiler\stage2\build\TcBinds.dyn_o" "compiler\stage2\build\TcClassDcl.dyn_o" "c ompiler\stage2\build\TcDefaults.dyn_o" "compiler\stage2\build\TcDeriv.dyn_o" "compiler\stage2\b uild\TcEnv.dyn_o" "compiler\stage2\build\TcExpr.dyn_o" "compiler\stage2\build\TcForeign.dyn_o" "compiler\stage2\build\TcGenDeriv.dyn_o" "compiler\stage2\build\TcGenGenerics.dyn_o" "compiler\ stage2\build\TcHsSyn.dyn_o" "compiler\stage2\build\TcHsType.dyn_o" "compiler\stage2\build\TcIns tDcls.dyn_o" "compiler\stage2\build\TcMType.dyn_o" "compiler\stage2\build\TcValidity.dyn_o" "co mpiler\stage2\build\TcMatches.dyn_o" "compiler\stage2\build\TcPat.dyn_o" "compiler\stage2\build \TcRnDriver.dyn_o" "compiler\stage2\build\TcRnMonad.dyn_o" "compiler\stage2\build\TcRnTypes.dyn _o" "compiler\stage2\build\TcRules.dyn_o" "compiler\stage2\build\TcSimplify.dyn_o" "compiler\st age2\build\TcErrors.dyn_o" "compiler\stage2\build\TcTyClsDecls.dyn_o" "compiler\stage2\build\Tc TyDecls.dyn_o" "compiler\stage2\build\TcUnify.dyn_o" "compiler\stage2\build\TcInteract.dyn_o" " compiler\stage2\build\TcCanonical.dyn_o" "compiler\stage2\build\TcSMonad.dyn_o" "compiler\stage 2\build\FunDeps.dyn_o" "compiler\stage2\build\GraphBase.dyn_o" "compiler\stage2\build\GraphColo r.dyn_o" "compiler\stage2\build\GraphOps.dyn_o" "compiler\stage2\build\GraphPpr.dyn_o" "compile r\stage2\build\IOEnv.dyn_o" "compiler\stage2\build\State.dyn_o" "compiler\stage2\build\Vectoris e\Builtins\Base.dyn_o" "compiler\stage2\build\Vectorise\Builtins\Initialise.dyn_o" "compiler\st age2\build\Vectorise\Builtins.dyn_o" "compiler\stage2\build\Vectorise\Monad\Base.dyn_o" "compil er\stage2\build\Vectorise\Monad\Naming.dyn_o" "compiler\stage2\build\Vectorise\Monad\Local.dyn_ o" "compiler\stage2\build\Vectorise\Monad\Global.dyn_o" "compiler\stage2\build\Vectorise\Monad\ InstEnv.dyn_o" "compiler\stage2\build\Vectorise\Monad.dyn_o" "compiler\stage2\build\Vectorise\U tils\Base.dyn_o" "compiler\stage2\build\Vectorise\Utils\Closure.dyn_o" "compiler\stage2\build\V ectorise\Utils\Hoisting.dyn_o" "compiler\stage2\build\Vectorise\Utils\PADict.dyn_o" "compiler\s tage2\build\Vectorise\Utils\Poly.dyn_o" "compiler\stage2\build\Vectorise\Utils.dyn_o" "compiler \stage2\build\Vectorise\Generic\Description.dyn_o" "compiler\stage2\build\Vectorise\Generic\PAM ethods.dyn_o" "compiler\stage2\build\Vectorise\Generic\PADict.dyn_o" "compiler\stage2\build\Vec torise\Generic\PData.dyn_o" "compiler\stage2\build\Vectorise\Type\Env.dyn_o" "compiler\stage2\b uild\Vectorise\Type\Type.dyn_o" "compiler\stage2\build\Vectorise\Type\TyConDecl.dyn_o" "compile r\stage2\build\Vectorise\Type\Classify.dyn_o" "compiler\stage2\build\Vectorise\Convert.dyn_o" " compiler\stage2\build\Vectorise\Vect.dyn_o" "compiler\stage2\build\Vectorise\Var.dyn_o" "compil er\stage2\build\Vectorise\Env.dyn_o" "compiler\stage2\build\Vectorise\Exp.dyn_o" "compiler\stag e2\build\Vectorise.dyn_o" "compiler\stage2\build\AsmCodeGen.dyn_o" "compiler\stage2\build\Targe tReg.dyn_o" "compiler\stage2\build\NCGMonad.dyn_o" "compiler\stage2\build\Instruction.dyn_o" "c ompiler\stage2\build\Size.dyn_o" "compiler\stage2\build\PIC.dyn_o" "compiler\stage2\build\CPrim .dyn_o" "compiler\stage2\build\X86\Regs.dyn_o" "compiler\stage2\build\X86\RegInfo.dyn_o" "compi ler\stage2\build\X86\Instr.dyn_o" "compiler\stage2\build\X86\Cond.dyn_o" "compiler\stage2\build \X86\Ppr.dyn_o" "compiler\stage2\build\X86\CodeGen.dyn_o" "compiler\stage2\build\PPC\Regs.dyn_o " "compiler\stage2\build\PPC\RegInfo.dyn_o" "compiler\stage2\build\PPC\Instr.dyn_o" "compiler\s tage2\build\PPC\Cond.dyn_o" "compiler\stage2\build\PPC\Ppr.dyn_o" "compiler\stage2\build\PPC\Co deGen.dyn_o" "compiler\stage2\build\SPARC\Base.dyn_o" "compiler\stage2\build\SPARC\Regs.dyn_o" "compiler\stage2\build\SPARC\Imm.dyn_o" "compiler\stage2\build\SPARC\AddrMode.dyn_o" "compiler\ stage2\build\SPARC\Cond.dyn_o" "compiler\stage2\build\SPARC\Instr.dyn_o" "compiler\stage2\build \SPARC\Stack.dyn_o" "compiler\stage2\build\SPARC\ShortcutJump.dyn_o" "compiler\stage2\build\SPA RC\Ppr.dyn_o" "compiler\stage2\build\SPARC\CodeGen.dyn_o" "compiler\stage2\build\SPARC\CodeGen\ Amode.dyn_o" "compiler\stage2\build\SPARC\CodeGen\Base.dyn_o" "compiler\stage2\build\SPARC\Code Gen\CondCode.dyn_o" "compiler\stage2\build\SPARC\CodeGen\Gen32.dyn_o" "compiler\stage2\build\SP ARC\CodeGen\Gen64.dyn_o" "compiler\stage2\build\SPARC\CodeGen\Sanity.dyn_o" "compiler\stage2\bu ild\SPARC\CodeGen\Expand.dyn_o" "compiler\stage2\build\RegAlloc\Liveness.dyn_o" "compiler\stage 2\build\RegAlloc\Graph\Main.dyn_o" "compiler\stage2\build\RegAlloc\Graph\Stats.dyn_o" "compiler \stage2\build\RegAlloc\Graph\ArchBase.dyn_o" "compiler\stage2\build\RegAlloc\Graph\ArchX86.dyn_ o" "compiler\stage2\build\RegAlloc\Graph\Coalesce.dyn_o" "compiler\stage2\build\RegAlloc\Graph\ Spill.dyn_o" "compiler\stage2\build\RegAlloc\Graph\SpillClean.dyn_o" "compiler\stage2\build\Reg Alloc\Graph\SpillCost.dyn_o" "compiler\stage2\build\RegAlloc\Graph\TrivColorable.dyn_o" "compil er\stage2\build\RegAlloc\Linear\Main.dyn_o" "compiler\stage2\build\RegAlloc\Linear\JoinToTarget s.dyn_o" "compiler\stage2\build\RegAlloc\Linear\State.dyn_o" "compiler\stage2\build\RegAlloc\Li near\Stats.dyn_o" "compiler\stage2\build\RegAlloc\Linear\FreeRegs.dyn_o" "compiler\stage2\build \RegAlloc\Linear\StackMap.dyn_o" "compiler\stage2\build\RegAlloc\Linear\Base.dyn_o" "compiler\s tage2\build\RegAlloc\Linear\X86\FreeRegs.dyn_o" "compiler\stage2\build\RegAlloc\Linear\X86_64\F reeRegs.dyn_o" "compiler\stage2\build\RegAlloc\Linear\PPC\FreeRegs.dyn_o" "compiler\stage2\buil d\RegAlloc\Linear\SPARC\FreeRegs.dyn_o" "compiler\stage2\build\DsMeta.dyn_o" "compiler\stage2\b uild\TcSplice.dyn_o" "compiler\stage2\build\Convert.dyn_o" "compiler\stage2\build\ByteCodeGen.d yn_o" "compiler\stage2\build\Debugger.dyn_o" "compiler\stage2\build\LibFFI.dyn_o" "compiler\sta ge2\build\Linker.dyn_o" "compiler\stage2\build\RtClosureInspect.dyn_o" "compiler\stage2\build\D ebuggerUtils.dyn_o" "compiler\stage2\build\parser\cutils.dyn_o" "compiler\stage2\build\ghci\kee pCAFsForGHCi.dyn_o" "compiler\stage2\build\cbits\genSym.dyn_o" "-lHSghc-7.7.20130904-0-ghc7.7.2 0130904.dll" "-Lcompiler/stage2/build" "-Lc:\Users\ezyang\Dev\ghc- validate\libraries\transforme rs\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc-validate\libraries \template-haskell\dist-inst all\build" "-Lc:\Users\ezyang\Dev\ghc-validate\libraries\hpc\dist- install\build" "-Lc:\Users\ez yang\Dev\ghc-validate\libraries\hoopl\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc-validate\l ibraries\bin-package-db\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc- validate\libraries\binar y\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc- validate\libraries\Cabal\Cabal\dist-install\bu ild" "-Lc:\Users\ezyang\Dev\ghc-validate\libraries\process\dist- install\build" "-Lc:\Users\ezya ng\Dev\ghc-validate\libraries\pretty\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc-validate\li braries\directory\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc- validate\libraries\time\dist-i nstall\build" "-Lc:\Users\ezyang\Dev\ghc-validate\libraries\old-locale \dist-install\build" "-Lc :\Users\ezyang\Dev\ghc-validate\libraries\filepath\dist-install\build" "-Lc:\Users\ezyang\Dev\g hc-validate\libraries\Win32\dist-install\build" "-Lc:\Users\ezyang\Dev \ghc-validate\libraries\c ontainers\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc- validate\libraries\bytestring\dist-ins tall\build" "-Lc:\Users\ezyang\Dev\ghc-validate\libraries\deepseq\dist- install\build" "-Lc:\Use rs\ezyang\Dev\ghc-validate\libraries\array\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc-valid ate\libraries\base\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc- validate\libraries\integer-gm p\dist-install\build" "-Lc:\Users\ezyang\Dev\ghc-validate\libraries\ghc- prim\dist-install\build " "-Lc:/Users/ezyang/Dev/ghc-validate/rts/dist/build" "-lHStransformers-0.3.0.0-ghc7.7.20130904 " "-lHStemplate-haskell-2.9.0.0-ghc7.7.20130904" "-lHShpc-0.6.0.1-ghc7.7.20130904" "-lHShoopl-3 .10.0.0-ghc7.7.20130904" "-lHSbin-package-db-0.0.0.0-ghc7.7.20130904" "-lHSbinary-0.7.1.0-ghc7. 7.20130904" "-lHSCabal-1.18.0-ghc7.7.20130904" "-lHSprocess-1.2.0.0-ghc7.7.20130904" "-lHSprett y-1.1.1.0-ghc7.7.20130904" "-lHSdirectory-1.2.0.1-ghc7.7.20130904" "-lHStime-1.4.1-ghc7.7.20130 904" "-lHSold-locale-1.0.0.5-ghc7.7.20130904" "-lHSfilepath-1.3.0.2-ghc7.7.20130904" "-lHSWin32 -2.3.0.0-ghc7.7.20130904" "-lHScontainers-0.5.2.1-ghc7.7.20130904" "-lHSbytestring-0.10.3.0-ghc 7.7.20130904" "-lHSdeepseq-1.3.0.2-ghc7.7.20130904" "-lHSarray-0.4.0.2-ghc7.7.20130904" "-lHSba se-4.7.0.0-ghc7.7.20130904" "-lHSinteger-gmp-0.5.1.0-ghc7.7.20130904" "-lHSghc-prim-0.3.1.0-ghc 7.7.20130904" "-lHSrts_thr-ghc7.7.20130904" "-lffi-6" "-lkernel32" "-luser32" "-lgdi32" "-lwinm m" "-ladvapi32" "-lshell32" "-lshfolder" "-lwsock32" "-luser32" "-lshell32" "-lm" "-lwsock32" " -lgdi32" "-lwinmm" "-lmingwex" "-Wl,-u,_ghczmprim_GHCziTypes_Izh_static_info" "-Wl,-u,_ghczmpri m_GHCziTypes_Czh_static_info" "-Wl,-u,_ghczmprim_GHCziTypes_Fzh_static_info" "-Wl,-u,_ghczmprim _GHCziTypes_Dzh_static_info" "-Wl,-u,_base_GHCziPtr_Ptr_static_info" "-Wl,-u,_ghczmprim_GHCziTy pes_Wzh_static_info" "-Wl,-u,_base_GHCziInt_I8zh_static_info" "-Wl,-u,_base_GHCziInt_I16zh_stat ic_info" "-Wl,-u,_base_GHCziInt_I32zh_static_info" "-Wl,-u,_base_GHCziInt_I64zh_static_info" "- Wl,-u,_base_GHCziWord_W8zh_static_info" "-Wl,-u,_base_GHCziWord_W16zh_static_info" "-Wl,-u,_bas e_GHCziWord_W32zh_static_info" "-Wl,-u,_base_GHCziWord_W64zh_static_info" "-Wl,-u,_base_GHCziSt able_StablePtr_static_info" "-Wl,-u,_ghczmprim_GHCziTypes_Izh_con_info" "-Wl,-u,_ghczmprim_GHCz iTypes_Czh_con_info" "-Wl,-u,_ghczmprim_GHCziTypes_Fzh_con_info" "-Wl,-u,_ghczmprim_GHCziTypes_ Dzh_con_info" "-Wl,-u,_base_GHCziPtr_Ptr_con_info" "-Wl,-u,_base_GHCziPtr_FunPtr_con_info" "-Wl ,-u,_base_GHCziStable_StablePtr_con_info" "-Wl,-u,_ghczmprim_GHCziTypes_False_closure" "-Wl,-u, _ghczmprim_GHCziTypes_True_closure" "-Wl,-u,_base_GHCziPack_unpackCString_closure" "-Wl,-u,_bas e_GHCziIOziException_stackOverflow_closure" "-Wl,-u,_base_GHCziIOziException_heapOverflow_closu re" "-Wl,-u,_base_ControlziExceptionziBase_nonTermination_closure" "-Wl,-u,_base_GHCziIOziExcep tion_blockedIndefinitelyOnMVar_closure" "-Wl,-u,_base_GHCziIOziException_blockedIndefinitelyOnS TM_closure" "-Wl,-u,_base_ControlziExceptionziBase_nestedAtomically_closure" "-Wl,-u,_base_GHCz iWeak_runFinalizzerBatch_closure" "-Wl,-u,_base_GHCziTopHandler_flushStdHandles_closure" "-Wl,- u,_base_GHCziTopHandler_runIO_closure" "-Wl,-u,_base_GHCziTopHandler_runNonIO_closure" "-Wl,-u, _base_GHCziConcziIO_ensureIOManagerIsRunning_closure" "-Wl,-u,_base_GHCziConcziIO_ioManagerCapa bilitiesChanged_closure" "-Wl,-u,_base_GHCziConcziSync_runSparks_closure" "-Wl,-u,_base_GHCziCo ncziSignal_runHandlers_closure" "-Wl,--hash-size=31" "-Wl,--reduce-memory- overheads" }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8229> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8127: iOS patch no 19: Linking
by GHC 05 Sep '15

05 Sep '15

#8127: iOS patch no 19: Linking -------------------------------------+------------------------------------- Reporter: StephenBlackheath | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Keywords: | Operating System: Other Architecture: arm | Type of failure: GHC doesn't work Difficulty: Moderate (less | at all than a day) | Test Case: Blocked By: | Blocking: 7724 Related Tickets: | -------------------------------------+------------------------------------- Fix linking for cross compiler to iOS. This patch does these things: 1. use libtool to link to a static library in place of an executable (because on iOS the final link must be done in Xcode), 2. for packages, keep only the HS package libraries and throw out other options (because libtool doesn't accept them), 3. fail if you try to link a dynamic library on iOS because it isn't supported (not really needed but there for completeness). Note that there is a minor risk here, because in the normal case, the order of options passed to the linker is slightly different: The options relating to each dependent package are separated into three different kinds, but they're still in the same relative order per package. This should be perfectly OK. The name of "libtool" is hard-coded and can't be set by options. Is this OK? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8127> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8096: Add fudge-factor for performance tests run on non-validate builds
by GHC 27 Aug '15

27 Aug '15

#8096: Add fudge-factor for performance tests run on non-validate builds ------------------------------------+------------------------------------- Reporter: ezyang | Owner: Type: task | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- Since I'm not going to get around to this immediately, Trac'ifying for posterity: These tests have been doing better than expected in the nightlies for some while. {{{ Unexpected failures: perf/compiler T3064 [stat too good] (normal) perf/compiler T3294 [stat too good] (normal) perf/compiler T5642 [stat too good] (normal) perf/haddock haddock.Cabal [stat too good] (normal) perf/haddock haddock.base [stat too good] (normal) }}} Unfortunately, fixing them is not a simple matter of shifting the ranges up, since the tests only exceed expectations on a /perf/ build, so on a normal build such as 'quick', these tests all pass normally. I could bump up the upper bounds so that the builder stops bleating about them; perhaps we could do something more complicated where the expected performance depends on what level of optimization GHC was built with (but I don't know how to implement this.) ---- The problem with just widening the bounds to cover 2 different types of build is that it increases the chance that performance changes won't actually be noticed by thge person responsible. Having different bounds for different build configurations is a pain, because (a) the testsuite has to work out which set of bounds to use, and (b) you now have even more wobbly values to keep up-to-date. I think perhaps the best thing would be to add some sort of (per-test?) fudge factor for non-validate builds. That way validate will still find performance regressions, like it does today, but other builds are less likely to give false positives. (Igloo) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8096> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8330: Remove ExtsCompat46 module once we bootstrap with GHC 7.8
by GHC 24 Aug '15

24 Aug '15

#8330: Remove ExtsCompat46 module once we bootstrap with GHC 7.8 -------------------------------------------+------------------------------- Reporter: jstolarek | Owner: Type: task | Status: new Priority: low | Milestone: 7.10.1 Component: Compiler | Version: 7.7 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Easy (less than 1 hour) | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: -------------------------------------------+------------------------------- Changing type signature of comparison primops from `Bool` to `Int#` in GHC 7.8 (see #6135) caused a problem: type signatures of functions might be different for the bootstrapping compiler (if it is older than 7.8) than they are for the stage1 compiler. In order to solve this problem I introduced a compatibility module [[GhcFile(compiler/utils/ExtsCompat46)]] that provides different definition of primops for older versions of GHC (`__GLASGOW_HASKELL__ <= 706`) and different for newer versions (`__GLASGOW_HASKELL__ > 706`). However, once we set minimal version of GHC required for bootstrapping to be 7.8, we can (and should!) remove that compatibility module and go back to using GHC.Exts. This ticket is a reminder that we should do this after we release GHC 7.10 or 7.12. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8330> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8484: Compile-time panic
by GHC 20 Aug '15

20 Aug '15

#8484: Compile-time panic ----------------------------------+--------------------------------------- Reporter: Taymon | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: Compile-time crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+--------------------------------------- I attempted to build a program (using make) and got the following output: {{{ ghc -odir binaries -hidir binaries --make Main.hs -optl-w ghc: panic! (the 'impossible' happened) (GHC version 7.6.3 for x86_64-unknown-linux): While parsing "/home/taymonbeal/.ghc/x86_64-linux-7.6.3/package.conf.d/package.cache": too few bytes. Failed reading at byte position 8 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug make: *** [build] Error 1 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8484> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9014: GHC 7.8.2 Win64 tarball includes gfortran/gcj/python
by GHC 12 Aug '15

12 Aug '15

#9014: GHC 7.8.2 Win64 tarball includes gfortran/gcj/python -------------------------------------------+---------------------------- Reporter: refold | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type checker) | Version: 7.8.2 Keywords: | Operating System: Windows Architecture: x86_64 (amd64) | Type of failure: Other Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | -------------------------------------------+---------------------------- The released Windows 64 tarball available at https://www.haskell.org/ghc/dist/7.8.2/ghc-7.8.2-x86_64-unknown- mingw32.tar.xz includes the following under `mingw/bin`: * gfortran * gcj * python27.dll * The whole Python 2.7 standard library (`mingw/bin/lib`) These files have probably been included by mistake. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9014> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9049: Expose srcLoc from the assertion architecture to allow better error messages
by GHC 12 Aug '15

12 Aug '15

#9049: Expose srcLoc from the assertion architecture to allow better error messages ------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- Assertions give great error messages by including file name and line, but they are disabled for optimisation. While there is a compiler flag to turn them on even in presence of optimisation, this is an awkward external way to simply attach a useful error location to something like `error`. It would be great if we could decouple getting the current `srcLoc` from assertions, and making it available for good error messages. It is currently possible to do this using TemplateHaskell (e.g. the `placeholders` package) or `CPP`, but both are inconvenient for technical reasons (such as breaking tooling) and do not enjoy widespread use. It seems a shame that the architecture for annotated error messages is already there, but only available through a mechanism that is disabled for optimisation (or at least "intended" to be disabled for optimisation). Notably, we have the same architecture available for pattern mach failures: {{{ f x | x > 0 = "foo" main = putStrLn (f (-1)) -- gives srcLoc'd pattern match error message }}} {{{ f x | x > 0 = "foo" f _ = error "f needs a positive number" main = putStrLn (f (-1)) -- does not give a srcLoc'd error message }}} It seems non-sensical that your try to write a better error message (here using `error`) yields in fact a less-helpful error message. I completely agree that one can aid bug-fixing by writing globally unique arguments to `error` or using TH, but from an engineering perspective, a little bit of help from the language/compiler side can improve the situation a lot, and in other languages this is acknowledged and used to everybody's benefit. There are some alternatives we might consider, such as * exposing `srcLoc :: String` that gives an `assert`-style location at the lexical position of its occurrence * adding an `error`-like function that behaves like `error` but also prints a source location Arguably `srcLoc :: String` breaks equational reasoning on the ''syntactic'' level, as `let x = srcLoc in (x, x)` and `(srcLoc, srcLoc)` have different values. However, looking at it from a program execution point of view, referential transparency is preserved since once compiled, any function using `srcLoc` will always return the same location. I believe that offering ''some'' kind of improvement over the dreaded `error` or `Prelude: undefined` should be easy to implement, but let's hear what the people who actually know the compiler think about it. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9049> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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