June 2014 - ghc-tickets

[GHC] #8435: Do not copy stack after stack overflow
by GHC 12 Jun '15

12 Jun '15

#8435: Do not copy stack after stack overflow ------------------------------+-------------------------------------------- Reporter: ezyang | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: Runtime | Version: 7.7 System | Operating System: Unknown/Multiple Keywords: | Type of failure: Runtime performance bug Architecture: | Test Case: Unknown/Multiple | Blocking: Difficulty: Unknown | Blocked By: | Related Tickets: | ------------------------------+-------------------------------------------- I am not sure, but I was doing a close reading of `threadStackOverflow` and noticed that after we throw a stack overflow exception, we fall through to the code responsible for allocating a new stack and copying the code over. An old iteration of the stack overflow code (removed in the commit cited below) did return after throwing the exception, and I did not see anything in the commit message suggesting the change was intentional. It seems sound to copy the stack; it will just become dead immediately. The relevant commit: {{{ commit f30d527344db528618f64a25250a3be557d9f287 Author: Simon Marlow <marlowsd(a)gmail.com> Date: Wed Dec 15 12:08:43 2010 +0000 Implement stack chunks and separate TSO/STACK objects }}} Suggested (untested) patch: {{{ diff --git a/rts/Threads.c b/rts/Threads.c index 742119d..ccd6b17 100644 --- a/rts/Threads.c +++ b/rts/Threads.c @@ -533,6 +533,7 @@ threadStackOverflow (Capability *cap, StgTSO *tso) // Send this thread the StackOverflow exception throwToSingleThreaded(cap, tso, (StgClosure *)stackOverflow_closure); + return; } }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8435> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9252: Generalize hs-boot files to be more like module signatures
by GHC 11 Jun '15

11 Jun '15

#9252: Generalize hs-boot files to be more like module signatures ------------------------------------+------------------------------------- Reporter: ezyang | Owner: ezyang Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: backpack | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- Right now, `hs-boot` is used solely to support mutually recursive modules. However, as [wiki:Backpack Backpack] has shown, signatures are an essential part of separate modular development, and since hs-boot files are essentially module signatures, it would be good to move away from "hs- boot as a technical mechanism to make mutual recursion to work" to "hsig as a module signature useful for separate modular development and mutual recursion." Here are some of the things that this would entail: 1. Introduce hsig as a valid alternate file suffix to hs-boot (similarly have hisig for hi-boot; the plan being to eventually deprecate the hs-boot prefix) 2. Given an hsig file corresponding to a module in the current package database (but not from the currently being compiled package), check if the corresponding module implements the signature (this is the reverse of the current check we do for hs-boot files, which occurs when we typecheck the module, as opposed to the hs-boot file.) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9252> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8172: Expose CWD and import search paths in GHCi via new `:show paths` command
by GHC 11 Jun '15

11 Jun '15

#8172: Expose CWD and import search paths in GHCi via new `:show paths` command -------------------------------------------+------------------------------- Reporter: hvr | Owner: hvr Type: feature request | Status: new Priority: normal | Milestone: Component: GHCi | 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: -------------------------------------------+------------------------------- - Currently, GHCi provides a `:cd` command but no respective builtin command to query the currently set path. - Moreover, there's no obvious way to query the currently active `importPaths` dynamic flags field, to find out which `-i` options are currently in effect. The attached patch extends `:show` with a `:show paths` subcommand, printing the CWD and the current value of `importPaths`: {{{ Ok, modules loaded: Main, InteractiveUI, Paths_ghci_ng, GhciMonad, GhciTags. λ> :show paths current working directory: /home/hvr/Haskell/My/ghci-ng module import search paths: dist/build/ghci-ng/ghci-ng-tmp ghc dist/build/autogen λ> :set -i λ> :show paths current working directory: /home/hvr/Haskell/My/ghci-ng module import search paths: none > :cd /tmp Warning: changing directory causes all loaded modules to be unloaded, because the search path has changed. > :show paths current working directory: /tmp module import search paths: none }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8172> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9101: Build 7.8.2 from sources on Windows/msys2
by GHC 09 Jun '15

09 Jun '15

#9101: Build 7.8.2 from sources on Windows/msys2 ------------------------------------+--------------------------------- Reporter: cchantep | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Windows Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+--------------------------------- Hi, Trying to build GHC 7.8.2 from sources on Windows 7, from msys2 shell, required binaries such as gcc, ld, ar are forced to those in inplace directories (windows-extra), even system/env provide such tools (e.g. using pacman package manager in msys2): https://ghc.haskell.org/trac/ghc/browser/ghc/configure.ac#L274 . It leads to issues as tools in inplace are quite old. Particularly it can be critical about linking: GHC will be working with old ld, but you can have built/linked libraries using the more recent ld. Then, what's built using system tool can't be used throught GHC (ld version conflict). -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9101> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8244: Removing the Cabal dependency
by GHC 06 Jun '15

06 Jun '15

#8244: Removing the Cabal dependency ------------------------------------+------------------------------------- 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: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- GHC depends on cabal, which is so far has been problematic many times, for many reasons. A few discussions include: * http://www.haskell.org/pipermail/haskell-cafe/2013-September/108746.html * http://www.haskell.org/pipermail/ghc-devs/2013-March/000821.html GHC uses only a very small part of Cabal, in these files: {{{ ./compiler/ghci/Linker.lhs ./compiler/main/Packages.lhs ./compiler/main/PackageConfig.hs ./compiler/main/Finder.lhs }}} plus 1 file for ghc-pkg: ./utils/ghc-pkg/Main.hs (see http://www.haskell.org/pipermail/haskell-cafe/2013-September/108750.html for details). It was proposed that either * the package format could be a plain specification without direct code dependencies * the Cabal package could be split off into Cabal-the-build-system and a minimal part to describe the package DB to be shared by Cabal and GHC The Cabal part that is used is in only a few modules of Distribution.* while the remaining majority of the Cabal-the-library package is not used (e.g. none of Distribution.Simple.*). Decoupling GHC and Cabal seems to be a public desire, yet there are some problems with these approaches. Let us discuss them in this ticket. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8244> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8723: sdist should not have to build everything
by GHC 04 Jun '15

04 Jun '15

#8723: sdist should not have to build everything ----------------------------------------------+---------------------------- Reporter: nomeata | Owner: Type: task | Status: new Priority: low | Milestone: Component: Build System | Version: 7.6.3 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Moderate (less than a day) | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: ----------------------------------------------+---------------------------- It would be nice if instead of {{{ $ perl boot $ ./configure $ make $ make sdist }}} it would suffice to run {{{ $ perl boot $ ./configure $ make sdist }}} and if that would not build more than necessary to generate the tarballs. It would save time on the GHC-HEAD-Debian-Package-autobuilder that I am currently working on. I might look into this bug eventually, but if someone else feels like doing it: Even better. (Difficulty estimated conservatively; might well be less than an hour, besides maybe waiting for test runs to finish :-)) Remember to update MakingReleases and Building/StandardTargets if this is implemented. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8723> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8292: linker_unload test doesn't work on Windows
by GHC 31 May '15

31 May '15

#8292: linker_unload test doesn't work on Windows ------------------------------------+---------------------------------- Reporter: ezyang | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: Test Suite | Version: 7.7 Keywords: | Operating System: Windows Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: linker_unload Blocked By: | Blocking: Related Tickets: | ------------------------------------+---------------------------------- I fixed up the major issues but I am getting: {{{ "/c/Users/ezyang/Dev/ghc-dyn/inplace/bin/ghc-stage2.exe" -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts -c Test.hs -v0 # -rtsopts causes a warning "/c/Users/ezyang/Dev/ghc-dyn/inplace/bin/ghc-stage2.exe" -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db linker_unload.c -o linker_unload -no-hs-main -optc-Werror ./linker_unload \Users\ezyang\Dev\ghc-dyn\libraries\base\dist- install\build/libHSbase-4.7.0.0.a \Users\ezyang\Dev\ghc-dyn\libraries\ghc-prim\dist-install\build/libHSghc- prim-0.3.1.0.a \Users \ezyang\Dev\ghc-dyn\libraries\integer-gmp\dist-install\build/libHSinteger- gmp-0.5.1.0.a linker_unload.exe: \Users\ezyang\Dev\ghc-dyn\libraries\base\dist- install\build/libHSbase-4.7.0. 0.a: unknown symbol `_select' }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8292> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8122: make binary-dist broken on OS X in HEAD
by GHC 26 May '15

26 May '15

#8122: make binary-dist broken on OS X in HEAD --------------------------------+------------------------------------------ Reporter: danharaj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Operating System: MacOS X Architecture: x86_64 | Type of failure: Installing GHC failed (amd64) | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | --------------------------------+------------------------------------------ After a successful configure and make, make binary-dist fails: {{{ ➜ ghc git:(master) make ===--- building phase 0 make -r --no-print-directory -f ghc.mk phase=0 phase_0_builds make[1]: Nothing to be done for `phase_0_builds'. ===--- building phase 1 make -r --no-print-directory -f ghc.mk phase=1 phase_1_builds make[1]: Nothing to be done for `phase_1_builds'. ===--- building final phase make -r --no-print-directory -f ghc.mk phase=final all make[1]: Nothing to be done for `all'. ➜ ghc git:(master) make binary-dist rm -f bindist-list make -r --no-print-directory -f ghc.mk bindist BINDIST=YES "cp" -p ghc/stage1/build/tmp/ inplace/lib/bin/ghc-stage1 cp: ghc/stage1/build/tmp/ is a directory (not copied). make[1]: *** [inplace/lib/bin/ghc-stage1] Error 1 make: *** [binary-dist-prep] Error 2 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8122> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8549: GHCI incorrectly link symbols defined with foreign import ccall
by GHC 23 May '15

23 May '15

#8549: GHCI incorrectly link symbols defined with foreign import ccall -------------------------+------------------------------------------------- Reporter: | Owner: qnikst | Status: new Type: bug | Milestone: Priority: | Version: 7.6.3 normal | Operating System: Unknown/Multiple Component: GHCi | Type of failure: GHCi crash Keywords: | Test Case: Architecture: | https://gist.github.com/qnikst/324a66914b3aba878be5 Unknown/Multiple | Blocking: Difficulty: | Unknown | Blocked By: | Related Tickets: | -------------------------+------------------------------------------------- I have a problem that ghci when loads modules that uses external symbols incorrectly links them, the problem is not reproducible if I'm compiling executable or load modules with :load command. As a result every Pointer value is equivalent to constant 0x0000fffffff225ff. A minimal example is in attached link, it contains a small package and description how to reproduce a bug. Problem is also reproduces on the ghc-HEAD. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8549> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9219: Parallel build proceeds despite errors
by GHC 23 May '15

23 May '15

#9219: Parallel build proceeds despite errors -------------------------+------------------------------------------------- Reporter: | Owner: jstolarek | Status: new Type: bug | Milestone: Priority: | Version: 7.8.2 normal | Operating System: Unknown/Multiple Component: | Type of failure: Incorrect warning at Driver | compile-time Keywords: | Test Case: Architecture: | Blocking: Unknown/Multiple | Difficulty: | Unknown | Blocked By: | Related Tickets: | -------------------------+------------------------------------------------- A few weeks back during my work on singletons I got the following build log: {{{ Building singletons-1.0... Preprocessing library singletons-1.0... [ 6 of 45] Compiling Data.Singletons.Util ( src/Data/Singletons/Util.hs, dist/build/Data/Singletons/Util.o ) [ 7 of 45] Compiling Data.Singletons.Syntax ( src/Data/Singletons/Syntax.hs, dist/build/Data/Singletons/Syntax.o ) [Data.Singletons.Util changed] [ 8 of 45] Compiling Data.Singletons.Names ( src/Data/Singletons/Names.hs, dist/build/Data/Singletons/Names.o ) [Data.Singletons.Util changed] [ 9 of 45] Compiling Data.Singletons.Promote.Monad ( src/Data/Singletons/Promote/Monad.hs, dist/build/Data/Singletons/Promote/Monad.o ) [Data.Singletons.Util changed] [10 of 45] Compiling Data.Singletons.Single.Monad ( src/Data/Singletons/Single/Monad.hs, dist/build/Data/Singletons/Single/Monad.o ) [Data.Singletons.Promote.Monad changed] [11 of 45] Compiling Data.Singletons.Promote.Eq ( src/Data/Singletons/Promote/Eq.hs, dist/build/Data/Singletons/Promote/Eq.o ) [Data.Singletons.Util changed] [12 of 45] Compiling Data.Singletons.Promote.Ord ( src/Data/Singletons/Promote/Ord.hs, dist/build/Data/Singletons/Promote/Ord.o ) [Data.Singletons.Util changed] [13 of 45] Compiling Data.Singletons.Promote.Bounded ( src/Data/Singletons/Promote/Bounded.hs, dist/build/Data/Singletons/Promote/Bounded.o ) [Data.Singletons.Util changed] [14 of 45] Compiling Data.Singletons.Promote.Type ( src/Data/Singletons/Promote/Type.hs, dist/build/Data/Singletons/Promote/Type.o ) [Data.Singletons.Util changed] [15 of 45] Compiling Data.Singletons.Promote.Defun ( src/Data/Singletons/Promote/Defun.hs, dist/build/Data/Singletons/Promote/Defun.o ) [Data.Singletons.Promote.Monad changed] [16 of 45] Compiling Data.Singletons.Promote ( src/Data/Singletons/Promote.hs, dist/build/Data/Singletons/Promote.o ) [Data.Singletons.Promote.Defun changed] [17 of 45] Compiling Data.Promotion.Prelude.Bounded ( src/Data/Promotion/Prelude/Bounded.hs, dist/build/Data/Promotion/Prelude/Bounded.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package array-0.5.0.0 ... linking ... done. Loading package deepseq-1.3.0.2 ... linking ... done. Loading package containers-0.5.5.1 ... linking ... done. Loading package transformers-0.3.0.0 ... linking ... done. Loading package mtl-2.1.2 ... linking ... done. Loading package syb-0.4.1 ... linking ... done. Loading package pretty-1.1.1.1 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package th-desugar-1.4.0 ... linking ... done. src/Data/Promotion/Prelude/Bounded.hs:34:27: Not in scope: ‘boundedTypes’ src/Data/Promotion/Prelude/Bounded.hs:34:27: GHC stage restriction: ‘boundedTypes’ is used in a top-level splice or annotation, and must be imported, not defined locally In the first argument of ‘promoteBoundedInstances’, namely ‘boundedTypes’ In the expression: promoteBoundedInstances boundedTypes [18 of 45] Compiling Data.Singletons.Single.Type ( src/Data/Singletons/Single/Type.hs, dist/build/Data/Singletons/Single/Type.o ) [Data.Singletons.Single.Monad changed] [19 of 45] Compiling Data.Singletons.Single.Eq ( src/Data/Singletons/Single/Eq.hs, dist/build/Data/Singletons/Single/Eq.o ) [Data.Singletons.Util changed] [20 of 45] Compiling Data.Singletons.Single.Data ( src/Data/Singletons/Single/Data.hs, dist/build/Data/Singletons/Single/Data.o ) [Data.Singletons.Single.Monad changed] [21 of 45] Compiling Data.Singletons.Single ( src/Data/Singletons/Single.hs, dist/build/Data/Singletons/Single.o ) [Data.Singletons.Promote changed] [22 of 45] Compiling Data.Singletons.Prelude.Instances ( src/Data/Singletons/Prelude/Instances.hs, dist/build/Data/Singletons/Prelude/Instances.o ) [Data.Singletons.Single changed] [23 of 45] Compiling Data.Singletons.Prelude.Bool ( src/Data/Singletons/Prelude/Bool.hs, dist/build/Data/Singletons/Prelude/Bool.o ) [Data.Singletons.Prelude.Instances changed] [24 of 45] Compiling Data.Singletons.Prelude.Eq ( src/Data/Singletons/Prelude/Eq.hs, dist/build/Data/Singletons/Prelude/Eq.o ) [Data.Singletons.Prelude.Bool changed] [25 of 45] Compiling Data.Singletons.CustomStar ( src/Data/Singletons/CustomStar.hs, dist/build/Data/Singletons/CustomStar.o ) [Data.Singletons.Prelude.Bool changed] [26 of 45] Compiling Data.Promotion.Prelude.Eq ( src/Data/Promotion/Prelude/Eq.hs, dist/build/Data/Promotion/Prelude/Eq.o ) [Data.Singletons.Prelude.Eq changed] [27 of 45] Compiling Data.Promotion.Prelude.Bool ( src/Data/Promotion/Prelude/Bool.hs, dist/build/Data/Promotion/Prelude/Bool.o ) [Data.Singletons.Prelude.Bool changed] [28 of 45] Compiling Data.Singletons.TypeRepStar ( src/Data/Singletons/TypeRepStar.hs, dist/build/Data/Singletons/TypeRepStar.o ) [Data.Singletons.Prelude.Eq changed] [29 of 45] Compiling Data.Singletons.Prelude.Ord ( src/Data/Singletons/Prelude/Ord.hs, dist/build/Data/Singletons/Prelude/Ord.o ) [Data.Singletons.Prelude.Bool changed] [30 of 45] Compiling Data.Promotion.Prelude.Ord ( src/Data/Promotion/Prelude/Ord.hs, dist/build/Data/Promotion/Prelude/Ord.o ) [Data.Singletons.Prelude.Ord changed] [31 of 45] Compiling Data.Singletons.TypeLits ( src/Data/Singletons/TypeLits.hs, dist/build/Data/Singletons/TypeLits.o ) [Data.Singletons.Prelude.Bool changed] [32 of 45] Compiling Data.Singletons.TH ( src/Data/Singletons/TH.hs, dist/build/Data/Singletons/TH.o ) [Data.Singletons.Prelude.Bool changed] [33 of 45] Compiling Data.Singletons.Prelude.Base ( src/Data/Singletons/Prelude/Base.hs, dist/build/Data/Singletons/Prelude/Base.o ) [Data.Singletons.Prelude.Bool changed] [34 of 45] Compiling Data.Singletons.Prelude.Either ( src/Data/Singletons/Prelude/Either.hs, dist/build/Data/Singletons/Prelude/Either.o ) [Data.Singletons.Prelude.Base changed] [35 of 45] Compiling Data.Promotion.Prelude.Either ( src/Data/Promotion/Prelude/Either.hs, dist/build/Data/Promotion/Prelude/Either.o ) [Data.Singletons.Prelude.Either changed] [36 of 45] Compiling Data.Singletons.Prelude.Tuple ( src/Data/Singletons/Prelude/Tuple.hs, dist/build/Data/Singletons/Prelude/Tuple.o ) [Data.Singletons.Prelude.Instances changed] [37 of 45] Compiling Data.Promotion.Prelude.Tuple ( src/Data/Promotion/Prelude/Tuple.hs, dist/build/Data/Promotion/Prelude/Tuple.o ) [Data.Singletons.Prelude.Tuple changed] [38 of 45] Compiling Data.Promotion.Prelude.Base ( src/Data/Promotion/Prelude/Base.hs, dist/build/Data/Promotion/Prelude/Base.o ) [Data.Singletons.Prelude.Base changed] [39 of 45] Compiling Data.Singletons.Prelude.List ( src/Data/Singletons/Prelude/List.hs, dist/build/Data/Singletons/Prelude/List.o ) [Data.Singletons.Prelude.Base changed] [40 of 45] Compiling Data.Singletons.Prelude.Maybe ( src/Data/Singletons/Prelude/Maybe.hs, dist/build/Data/Singletons/Prelude/Maybe.o )[Data.Singletons.Prelude.Instances changed] [41 of 45] Compiling Data.Singletons.Prelude ( src/Data/Singletons/Prelude.hs, dist/build/Data/Singletons/Prelude.o ) [Data.Singletons.Prelude.Base changed] [42 of 45] Compiling Data.Promotion.Prelude.List ( src/Data/Promotion/Prelude/List.hs, dist/build/Data/Promotion/Prelude/List.o ) [Data.Promotion.Prelude.Ord changed] [43 of 45] Compiling Data.Promotion.Prelude.Maybe ( src/Data/Promotion/Prelude/Maybe.hs, dist/build/Data/Promotion/Prelude/Maybe.o ) [Data.Singletons.Prelude.Maybe changed] [45 of 45] Compiling Data.Promotion.TH ( src/Data/Promotion/TH.hs, dist/build/Data/Promotion/TH.o ) [Data.Singletons.Prelude.Bool changed] }}} Notice how file 18 of 45 fails to build and yet the build does not stop. It seems that while one thread fails the remaining ones pick up other files that can be compiled despite the failure. I'm not really sure if I'm against this design choice, but I'd certainly expect to get information that something went wrong during the build. Here I was confused when I realised that despite seemingly successful compilation my package was not built. Only after examining the build log I saw that one of the modules failed to build. This should be changed to clearly notify the user that compilation was not successful. PS. At first I thought this is cabal-install's fault, but [https://github.com/haskell/cabal/issues/1809 this was ruled out]. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9219> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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