October 2014 - ghc-tickets

[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] #9481: Linker does not correctly resolve symbols in previously loaded objects
by GHC 05 Sep '15

05 Sep '15

#9481: Linker does not correctly resolve symbols in previously loaded objects -------------------------------------+------------------------------------- Reporter: edsko | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- '''Summary''': Given two object files (created from C files) A and B, where B refers to symbols defined in A, if we load B before A, calling `resolveObjs` after each object file, symbol resolution goes wrong. Full test case attached. '''Detailed description''': Consider {{{#!c // a.c #include <stdio.h> void defined_in_A() { printf("In A\n"); } }}} {{{#!c // b.c #include <stdio.h> void defined_in_A(); void defined_in_B() { printf("In B\n"); defined_in_A(); printf("In B\n"); } }}} and {{{#!hs {-# LANGUAGE ForeignFunctionInterface #-} module Main where import System.IO foreign import ccall "defined_in_B" defined_in_B :: IO () main :: IO () main = defined_in_B }}} and we use the GHC API to load the object files `a.o` and `b.o` (corresponding to `a.c` and `b.c`), calling `resolveObjs` after loading each object, and then load `Main` and call `Main.main`, everything works fine (the attached test case contains both `a.c`, `b.c` and `Main.hs` as well as the test program that calls into the GHC API). However, if we load `b.o` ''before'' `a.o`, things go wrong. When we load `b.o` and call `resolveObjs` then `resolveObjs` (quite reasonably) complains that {{{ lookupSymbol failed in relocateSection (relocate external) b.o: unknown symbol `_defined_in_A' }}} since we haven't loaded `a.o` yet. But when we then load `a.o` and call `resolveObjs` again, `resolveObjs` reports okay, but something goes wrong because the program subsequently segfaults. '''A successful run''' I took a closer look at what happens exactly. First, let's consider the test run where we load A before B, and everything works fine, and let's look at the precise code that we actually execute when `Main.main` does the foreign call to `defined_in_B`: {{{ # lldb Linkerbug Current executable set to 'Linkerbug' (x86_64). (lldb) breakpoint set -n ffi_call Breakpoint 1: where = Linkerbug`ffi_call + 29 at ffi64.c:421, address = 0x0000000102be2eed (lldb) run Process 92361 launched: 'Linkerbug' (x86_64) Loading object "a.o" symbol resolution ok Loading object "b.o" symbol resolution ok Loading Haskell module "Main.hs" ok Running "Main.main" Process 92361 stopped * thread #1: tid = 0x32048b, 0x0000000102be2eed Linkerbug`ffi_call(cif=0x000000010cc68500, fn=0x0000000104c6c210, rvalue=0x00007fff5fbff920, avalue=0x00007fff5fbff8c0) + 29 at ffi64.c:421, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1 frame #0: 0x0000000102be2eed Linkerbug`ffi_call(cif=0x000000010cc68500, fn=0x0000000104c6c210, rvalue=0x00007fff5fbff920, avalue=0x00007fff5fbff8c0) + 29 at ffi64.c:421 (lldb) disassemble -c 14 -s fn 0x104c6c210: pushq %rbp 0x104c6c211: movq %rsp, %rbp 0x104c6c214: pushq %rbx 0x104c6c215: pushq %rax 0x104c6c216: leaq 0x1d(%rip), %rbx 0x104c6c21d: movq %rbx, %rdi 0x104c6c220: callq 0x104c6c3c8 0x104c6c225: xorl %eax, %eax 0x104c6c227: callq 0x104c6b210 0x104c6c22c: movq %rbx, %rdi 0x104c6c22f: addq $0x8, %rsp 0x104c6c233: popq %rbx 0x104c6c234: popq %rbp 0x104c6c235: jmpq 0x104c6c3c8 }}} This disassembly is the compiled code for B which, in order, does a call to `printf`, then to `defined_in_A`, and then back to `printf` (the last call is `jmpq` rather than `callq`: the C compiler did a tail call optimization). Let's make sure that this is actually true; the first call is a call to {{{ (lldb) disassemble -c 2 -s 0x104c6c3c8 0x104c6c3c8: jmpq *-0xe(%rip) 0x104c6c3ce: addb %al, (%rax) }}} which is an indirect jump to {{{ (lldb) memory read -f A -c 1 "0x104c6c3ce - 0xe" 0x104c6c3c0: 0x00007fff84fd5b9b libsystem_c.dylib`puts }}} to `puts`, okay, good. Seems an unnecessary level of indirection, but that's okay. The next call is to {{{ (lldb) disassemble -c 5 -s 0x104c6b210 0x104c6b210: pushq %rbp 0x104c6b211: movq %rsp, %rbp 0x104c6b214: leaq 0x6(%rip), %rdi 0x104c6b21b: popq %rbp 0x104c6b21c: jmpq 0x104c6b370 }}} which is the compiled code for `defined_in_A`, which should be just a call to `printf`. Let's confirm: {{{ (lldb) disassemble -c 2 -s 0x104c6b370 0x104c6b370: jmpq *-0xe(%rip) 0x104c6b376: addb %al, (%rax) (lldb) memory read -f A -c 1 "0x104c6b376 - 0xe" 0x104c6b368: 0x00007fff84fd5b9b libsystem_c.dylib`puts }}} Ok, all good. '''A failed run''' Now let's check what happens when we load the objects in the opposite order. The code that we execute is {{{ (lldb) disassemble -c 14 -s fn 0x104c6b210: pushq %rbp 0x104c6b211: movq %rsp, %rbp 0x104c6b214: pushq %rbx 0x104c6b215: pushq %rax 0x104c6b216: leaq 0x1d(%rip), %rbx 0x104c6b21d: movq %rbx, %rdi 0x104c6b220: callq 0x104c6b3c8 0x104c6b225: xorl %eax, %eax 0x104c6b227: callq 0x104c6c210 0x104c6b22c: movq %rbx, %rdi 0x104c6b22f: addq $0x8, %rsp 0x104c6b233: popq %rbx 0x104c6b234: popq %rbp 0x104c6b235: jmpq 0x104c6b556 }}} This immediately looks suspicious: the address of the `jmpq` (the second -- tail -- call to `printf`) is different from the first. The first `callq` is okay: {{{ (lldb) disassemble -c 2 -s 0x104c6b3c8 0x104c6b3c8: jmpq *-0xe(%rip) 0x104c6b3ce: addb %al, (%rax) (lldb) memory read -f A -c 1 "0x104c6b3ce - 0xe" 0x104c6b3c0: 0x00007fff84fd5b9b libsystem_c.dylib`puts }}} and the call to `defined_in_A`, as well as the code ''for'' `defined_in_A`, are both ok: {{{ (lldb) disassemble -c 5 -s 0x104c6c210 0x104c6c210: pushq %rbp 0x104c6c211: movq %rsp, %rbp 0x104c6c214: leaq 0x6(%rip), %rdi 0x104c6c21b: popq %rbp 0x104c6c21c: jmpq 0x104c6c370 (lldb) disassemble -c 2 -s 0x104c6c370 0x104c6c370: jmpq *-0xe(%rip) 0x104c6c376: addb %al, (%rax) (lldb) memory read -f A -c 1 "0x104c6c376 - 0xe" 0x104c6c368: 0x00007fff84fd5b9b libsystem_c.dylib`puts }}} However, that second call to `printf` (the `jmpq`) in `defined_in_B` is indeed wrong: it's jumping into nowhere: {{{ (lldb) memory read -c 8 0x104c6b556 0x104c6b556: 00 00 00 00 00 00 00 00 ........ }}} Note that somewhat surprisingly is it ''not'' the resolution of the symbol from `a.o` that is wrong; that ''does'' get resolved okay once we load `a.o`; rather, it is the jump to `puts` which is wrong (and then only the one of them). -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9481> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9280: GHCi crash:
by GHC 05 Sep '15

05 Sep '15

#9280: GHCi crash: ------------------------------------------+-------------------------------- Reporter: mietek | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.8.2 Keywords: crash, dynamic linking | Operating System: Architecture: x86_64 (amd64) | Unknown/Multiple Difficulty: Unknown | Type of failure: GHCi crash Blocked By: | Test Case: Related Tickets: | Blocking: ------------------------------------------+-------------------------------- Given a statically-linked Haskell object file, interactive GHCi 7.8.2 crashes. {{{ $ cat >Foo.hs <<EOF module Foo where foo :: IO () foo = print "Foo" EOF }}} On OS X: {{{ $ ghc -Wall -c -o Foo.o Foo.hs }}} {{{ $ ghci -v Foo.o GHCi, version 7.8.2: http://www.haskell.org/ghc/ :? for help Glasgow Haskell Compiler, Version 7.8.2, stage 2 booted by GHC version 7.6.3 Using binary package database: /opt/ghc-7.8.2/lib/ghc-7.8.2/package.conf.d/package.cache wired-in package ghc-prim mapped to ghc- prim-0.3.1.0-948744e1f99cc8bcc7c7d3ba60c7c2d8 wired-in package integer-gmp mapped to integer- gmp-0.5.1.0-dc47f6b546fc171f67a7f7d311684a99 wired-in package base mapped to base-4.7.0.0-a333addb6892f3cc2e6baa5ec782bd04 wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.9.0.0-ed6ecfb467e6936688bb20f968f702e1 wired-in package dph-seq not found. wired-in package dph-par not found. Hsc static flags: Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. *** gcc: /usr/bin/gcc -m64 -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/opt/ghc-7.8.2/lib/ghc-7.8.2/base-4.7.0.0 --print-file-name libiconv.dylib Loading package base ... linking ... done. Loading object (static) Foo.o ... Created temporary directory: /var/folders/26/0tzj1txn0vb_0061l4z4rsmr0000gn/T/ghc41409_0 *** Linker: /usr/bin/gcc -m64 -fno-stack-protector -DTABLES_NEXT_TO_CODE -m64 -dynamiclib -o /var/folders/26/0tzj1txn0vb_0061l4z4rsmr0000gn/T/ghc41409_0/ghc41409_1.dylib Foo.o -undefined dynamic_lookup -single_module -install_name '@rpath/ghc41409_1.dylib' -L/opt/ghc-7.8.2/lib/ghc-7.8.2/base-4.7.0.0 -Wl,-rpath -Wl,/opt/ghc-7.8.2/lib/ghc-7.8.2/base-4.7.0.0 -L/opt/ghc-7.8.2/lib/ghc-7.8.2/integer-gmp-0.5.1.0 -Wl,-rpath -Wl,/opt/ghc-7.8.2/lib/ghc-7.8.2/integer-gmp-0.5.1.0 -L/opt/ghc-7.8.2/lib/ghc-7.8.2/ghc-prim-0.3.1.0 -Wl,-rpath -Wl,/opt/ghc-7.8.2/lib/ghc-7.8.2/ghc-prim-0.3.1.0 -L/opt/ghc-7.8.2/lib/ghc-7.8.2/rts-1.0 -Wl,-rpath -Wl,/opt/ghc-7.8.2/lib/ghc-7.8.2/rts-1.0 -lHSbase-4.7.0.0-ghc7.8.2 -lHSinteger-gmp-0.5.1.0-ghc7.8.2 -lHSghc-prim-0.3.1.0-ghc7.8.2 -liconv ld: illegal text-relocation to '_ghczmprim_GHCziCString_unpackCStringzh_closure' in /opt/ghc-7.8.2/lib/ghc-7.8.2/ghc-prim-0.3.1.0/libHSghc- prim-0.3.1.0-ghc7.8.2.dylib from '_sVK_info' in Foo.o for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) *** Deleting temp files: Deleting: /var/folders/26/0tzj1txn0vb_0061l4z4rsmr0000gn/T/ghc41409_0/ghc41409_1.dylib Warning: deleting non-existent /var/folders/26/0tzj1txn0vb_0061l4z4rsmr0000gn/T/ghc41409_0/ghc41409_1.dylib *** Deleting temp dirs: Deleting: /var/folders/26/0tzj1txn0vb_0061l4z4rsmr0000gn/T/ghc41409_0 }}} On Linux, without `-fPIC`: {{{ $ ghc -Wall -c -o Foo.o Foo.hs }}} {{{ ghci -v Foo.o GHCi, version 7.8.2: http://www.haskell.org/ghc/ :? for help Glasgow Haskell Compiler, Version 7.8.2, stage 2 booted by GHC version 7.6.3 Using binary package database: /app/.halcyon/ghc/lib/ghc-7.8.2/package.conf.d/package.cache wired-in package ghc-prim mapped to ghc- prim-0.3.1.0-948744e1f99cc8bcc7c7d3ba60c7c2d8 wired-in package integer-gmp mapped to integer- gmp-0.5.1.0-dc47f6b546fc171f67a7f7d311684a99 wired-in package base mapped to base-4.7.0.0-018311399e3b6350d5be3a16b144df9b wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.9.0.0-dcc8c210fb02937e104bc1784d7b0f06 wired-in package dph-seq not found. wired-in package dph-par not found. Hsc static flags: Loading package ghc-prim ... linking ... done. *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/app/.halcyon/ghc/lib/ghc-7.8.2/integer-gmp-0.5.1.0 --print-file-name libgmp.so Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading object (static) Foo.o ... Created temporary directory: /tmp/ghc7203_0 *** Linker: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -o /tmp/ghc7203_0/ghc7203_1.so Foo.o -shared -Wl,-Bsymbolic -Wl,-h,ghc7203_1.so -L/app/.halcyon/ghc/lib/ghc-7.8.2/base-4.7.0.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/base-4.7.0.0 -L/app/.halcyon/ghc/lib/ghc-7.8.2/integer-gmp-0.5.1.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/integer-gmp-0.5.1.0 -L/app/.halcyon/ghc/lib/ghc-7.8.2/ghc-prim-0.3.1.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/ghc-prim-0.3.1.0 -L/app/.halcyon/ghc/lib/ghc-7.8.2/rts-1.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/rts-1.0 -lHSbase-4.7.0.0-ghc7.8.2 -lHSinteger-gmp-0.5.1.0-ghc7.8.2 -lHSghc-prim-0.3.1.0-ghc7.8.2 -lgmp '-Wl ,--hash-size=31' -Wl,--reduce-memory-overheads /usr/bin/ld: Foo.o: relocation R_X86_64_32S against `stg_bh_upd_frame_info' can not be used when making a shared object; recompile with -fPIC Foo.o: could not read symbols: Bad value collect2: ld returned 1 exit status *** Deleting temp files: Deleting: /tmp/ghc7203_0/ghc7203_1.so Warning: deleting non-existent /tmp/ghc7203_0/ghc7203_1.so *** Deleting temp dirs: Deleting: /tmp/ghc7203_0 }}} On Linux, with `-fPIC`: {{{ $ ghc -Wall -c -fPIC -o Foo.o Foo.hs }}} {{{ $ ghci -v Foo.o GHCi, version 7.8.2: http://www.haskell.org/ghc/ :? for help Glasgow Haskell Compiler, Version 7.8.2, stage 2 booted by GHC version 7.6.3 Using binary package database: /app/.halcyon/ghc/lib/ghc-7.8.2/package.conf.d/package.cache wired-in package ghc-prim mapped to ghc- prim-0.3.1.0-948744e1f99cc8bcc7c7d3ba60c7c2d8 wired-in package integer-gmp mapped to integer- gmp-0.5.1.0-dc47f6b546fc171f67a7f7d311684a99 wired-in package base mapped to base-4.7.0.0-018311399e3b6350d5be3a16b144df9b wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.9.0.0-dcc8c210fb02937e104bc1784d7b0f06 wired-in package dph-seq not found. wired-in package dph-par not found. Hsc static flags: Loading package ghc-prim ... linking ... done. *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/app/.halcyon/ghc/lib/ghc-7.8.2/integer-gmp-0.5.1.0 --print-file-name libgmp.so Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading object (static) Foo.o ... Created temporary directory: /tmp/ghc7223_0 *** Linker: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -o /tmp/ghc7223_0/ghc7223_1.so Foo.o -shared -Wl,-Bsymbolic -Wl,-h,ghc7223_1.so -L/app/.halcyon/ghc/lib/ghc-7.8.2/base-4.7.0.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/base-4.7.0.0 -L/app/.halcyon/ghc/lib/ghc-7.8.2/integer-gmp-0.5.1.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/integer-gmp-0.5.1.0 -L/app/.halcyon/ghc/lib/ghc-7.8.2/ghc-prim-0.3.1.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/ghc-prim-0.3.1.0 -L/app/.halcyon/ghc/lib/ghc-7.8.2/rts-1.0 -Wl,-rpath -Wl,/app/.halcyon/ghc/lib/ghc-7.8.2/rts-1.0 -lHSbase-4.7.0.0-ghc7.8.2 -lHSinteger-gmp-0.5.1.0-ghc7.8.2 -lHSghc-prim-0.3.1.0-ghc7.8.2 -lgmp '-Wl ,--hash-size=31' -Wl,--reduce-memory-overheads /usr/bin/ld: Foo.o: relocation R_X86_64_PC32 against undefined symbol `ghczmprim_GHCziCString_unpackCStringzh_closure' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: final link failed: Bad value collect2: ld returned 1 exit status *** Deleting temp files: Deleting: /tmp/ghc7223_0/ghc7223_1.so Warning: deleting non-existent /tmp/ghc7223_0/ghc7223_1.so *** Deleting temp dirs: Deleting: /tmp/ghc7223_0 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9280> 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

1 5

[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

1 14

[GHC] #9447: Add support for resizing `MutableByteArray#`s
by GHC 27 Aug '15

27 Aug '15

#9447: Add support for resizing `MutableByteArray#`s -------------------------------------+------------------------------------- Reporter: hvr | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: Phab:D133 -------------------------------------+------------------------------------- This is motivated by #9281 which changes how memory is allocated, and gives rise to the need to be able to efficiently shrink or grow `MutableByteArray#`s before they're frozen into `ByteArray#` while retaining their original byte content to avoid a major bottle-neck. This ticket is for tracking/documenting all changes related to this new facility. Here's the current road-map: 1. Implement {{{#!hs shrinkMutableByteArray# :: MutableByteArray# s -> Int# -> State# s -> State# s resizeMutableByteArray# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, MutableByteArray# s #) }}} (see Phab:D133) 2. As suggested by Johan, {{{#!hs getSizeofMutableByteArray# :: MutableByteArray# s -> State# s -> (# State# s Int# #) }}} This is similar in spirit to `numCapabilities` and `getNumCapabilities`. Add a deprecate pragma (or equivalent) for `sizeofMutableByteArray#`. Add a note to `sizeofMutableByteArray#` stating that it's unsafe in the presence of calls to resize-operations on the same MBA. 3. Submit patches to upstream libraries replacing calls to `sizeofMutableByteArray#` with `getSizeofMutableByteArray#` 4. Investigate how to provide in-place (zero-copy) growing of MBAs (step 1. only implements in-place shrinking). -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9447> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

1 6

[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] #9315: Weird change in allocation numbers of T9203
by GHC 27 Aug '15

27 Aug '15

#9315: Weird change in allocation numbers of T9203 ------------------------------------+------------------------------------- Reporter: nomeata | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 7.9 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- While trying to improve our handle on allocation numbers, I’m stuck with the test case T9203. On some machines, it allocates roughly 95747304 bytes (this includes travis and my laptop), on others 42946176 bytes (e.g. on the machine where I monitor benchmark performance). All machines are 64 bit Linux machines. The output of `-ddump-simpl`, `-ddump-stg` and `-ddump-cmm` is identical (up to variable names). Even `-ddump-asm` looks the same, besides some jump target reordering. The binary runs too small to get a heap profile. I’m a bit stuck here: What can be the cause for these differences? (BTW, if have an up-to-date GHC tree, can you report the number you get? Run `make -C testsuite VERBOSE=4 TEST=9203` for that.) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9315> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9257: CC_CLANG_BACKEND not reconfigured during bindist install
by GHC 27 Aug '15

27 Aug '15

#9257: CC_CLANG_BACKEND not reconfigured during bindist install -------------------------------------+------------------------------------- Reporter: MtnViewMark | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.8.2 Keywords: clang | Operating System: MacOS X Architecture: Unknown/Multiple | Type of failure: Installing GHC Difficulty: Moderate (less | failed than a day) | Test Case: Blocked By: | Blocking: Related Tickets: | -------------------------------------+------------------------------------- 1) build GHC is built on a machine with clang -- project.mk ends up with the macro CC_CLANG_BACKEND=1 2) make binary-dist on that machine 3) bring that bindist to a machine that doesn't use clang 4) unpack the bindist, ./configure, make install This error ensues: cc1: error: unrecognized command line option "-Wno-invalid-pp-token" cc1: error: unrecognized command line option "-Wno-unicode" The problem rests in that there is on gcc invocation during that make install: /usr/bin/gcc -E ... rts/package.conf.in -o rts/dist/package.conf.install.raw This call is picking up arguments from RAWCPP_FLAGS, set in mk/config.mk, based on CC_CLANG_BACKEND, set in mk/project.mk... which was computed at build time. carter has hypothesized that adding the macro FP_CC_LLVM_BACKEND to distrib/configure.ac.in might fix this. In theory that will cause the config file that is bunded into the bindist to recompute the CC_CLANG_BACKEND flag at dist config time. However, this may not work because the only file that emits CC_CLANG_BACKEND is project.mk and that doesn't seem to get re-written during dist time config. -- so something else will be needed. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9257> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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