January 2015 - ghc-tickets

[GHC] #8546: Panic during cabal build with profiling enabled.
by GHC 23 Feb '15

23 Feb '15

#8546: Panic during cabal build with profiling enabled. ---------------------------------+--------------------------------------- Reporter: Mokosha | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: cabal sandbox | Operating System: Windows Architecture: x86 | Type of failure: Compile-time crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ---------------------------------+--------------------------------------- I had been recently using cabal-dev for my development work. Someone suggested I switch over to the new cabal 1.18 on #haskell. After doing so, some projects do not seem to build anymore. I'm not an experienced Haskell developer, so I'm not sure how to go about debugging such a problem. I've included the output of the install command. {{{ Pavel@ZOMBIE-POWER ~/Projects/Lambency/src $ cabal install -p Resolving dependencies... Configuring bindings-GLFW-3.0.3.1... Building bindings-GLFW-3.0.3.1... Preprocessing library bindings-GLFW-3.0.3.1... [1 of 1] Compiling Bindings.GLFW ( dist\dist-sandbox- 2b66993e\build\Bindings\GLFW.hs, dist\dist-sandbox- 2b66993e\build\Bindings\GLFW.o ) [1 of 1] Compiling Bindings.GLFW ( dist\dist-sandbox- 2b66993e\build\Bindings\GLFW.hs, dist\dist-sandbox- 2b66993e\build\Bindings\GLFW.p_o ) In-place registering bindings-GLFW-3.0.3.1... Installing library in D:\MinGW\msys\1.0\home\Pavel\Projects\Lambency\build\i386-windows- ghc-7.6.3\bindings-GLFW-3.0.3.1 Registering bindings-GLFW-3.0.3.1... Installed bindings-GLFW-3.0.3.1 Configuring GLFW-b-1.4.1... Building GLFW-b-1.4.1... Preprocessing library GLFW-b-1.4.1... [1 of 3] Compiling Graphics.UI.GLFW.Types ( Graphics\UI\GLFW\Types.hs, dist\dist-sandbox-2b66993e\build\Graphics\UI\GLFW\Types.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package bindings-DSL-1.0.20 ... linking ... done. Loading package bindings-GLFW-3.0.3.1 ... ghc.exe: Unknown PEi386 section name `.drectve' (while processing: D:\MinGW\msys\1.0\home\Pavel\Projects\Lambency\build\i386-windows- ghc-7.6.3\bindings-GLFW-3 .0.3.1\libHSbindings-GLFW-3.0.3.1.a) ghc.exe: panic! (the 'impossible' happened) (GHC version 7.6.3 for i386-unknown-mingw32): loadArchive "D:\\MinGW\\msys\\1.0\\home\\Pavel\\Projects\\Lambency\\build\\i386 -windows-ghc-7.6.3\\bindings-GLFW-3.0.3.1\\libHSbindings-GLFW-3.0.3.1.a": failed Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Failed to install GLFW-b-1.4.1 cabal.exe: Error: some packages failed to install: GLFW-b-1.4.1 failed during the building phase. The exception was: ExitFailure 1 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8546> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9664: Add identity functor to base
by GHC 22 Feb '15

22 Feb '15

#9664: Add identity functor to base -------------------------------------+------------------------------------- Reporter: hvr | Owner: ekmett Type: task | Status: new Priority: normal | Milestone: 7.10.1 Component: Core Libraries | Version: Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Easy (less than 1 | Type of failure: hour) | None/Unknown Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- `base` already provides a `Const`ant functor, but the even more useful `Id`entity (or `Identity`) functor does not exist in `base` yet. This was already [https://groups.google.com/forum/#!msg/haskell-core- libraries/_nReDCbROew/Mdmf0zIloysJ proposed to the CLC back in early 2013], and already missed inclusion in GHC 7.8 However, in order to implement this, coordination with `transformers` is desirable, as `transformers` currently provides a non-transforming `Data.Functor.Identity`, and we'd like to avoid name clashes. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9664> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9631: Comment in GHC.Base about GHC.Prim does not appear to be correct
by GHC 22 Feb '15

22 Feb '15

#9631: Comment in GHC.Base about GHC.Prim does not appear to be correct -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.8.3 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | Documentation bug Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- The comment reads {{{ GHC.Prim Has no implementation. It defines built-in things, and by importing it you bring them into scope. The source file is GHC.Prim.hi-boot, which is just copied to make GHC.Prim.hi }}} It does not appear that any files by these names exist. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9631> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8362: Filesystem related tests failed on solaris (SmartOS)
by GHC 22 Feb '15

22 Feb '15

#8362: Filesystem related tests failed on solaris (SmartOS) --------------------------+------------------------------------------------ Reporter: leroux | Owner: Type: bug | Status: new Priority: high | Milestone: 7.8.1 Component: | Version: 7.6.3 libraries (other) | Operating System: Solaris Keywords: | Type of failure: Incorrect result at runtime Architecture: | Test Case: Unknown/Multiple | Blocking: Difficulty: | Unknown | Blocked By: | Related Tickets: | --------------------------+------------------------------------------------ Getting filesystem (files/permissions) related test faiures on SmartOS (32bit). {{{ $ uname -a SunOS pkgx86 5.11 joyent_20130919T215407Z i86pc i386 i86pc Solaris }}} Unexpected failures: `TEST="openFile003 getPermissions001 processGroup002 user001 posix005"` The testsuite output is attached. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8362> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9388: Narrow the scope of the notorious "state hack"
by GHC 22 Feb '15

22 Feb '15

#9388: Narrow the scope of the notorious "state hack" -------------------------------------+------------------------------------- Reporter: simonpj | 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: -------------------------------------+------------------------------------- The "state hack" has caused any number of bug reports (just search for that string), the most recent of which is #9349. Here's an idea to make it less pervasive: (roughly) use the state hack only for top-level functions definitions. The idea is that for nested lambdas the context should give the one-shot- ness, now that we are equipped with cardinality analysis. For example, consider the call {{{ replicatM_ 1000 (\(s :: RealWorld#) -> blah) }}} The lambda is 1000-shot, not one-shot, notwithstanding the type of the binder. Moreover `replicateM_`'s strictness/cardinality signature will say just that, and GHC already knows how to propagate that information onto the `\s`. But for top level functions like {{{ pr :: String -> IO () pr x = putStrLn (reverse x) }}} we get Core {{{ pr = \x. let y = reverse x in \ (s :: State# RealWorld). putStrLn y s }}} and, since we can't see all the callers of `pr`, we don't know if work is lost by pushing the `reverse` call inside, to get {{{ pr = \x. (s :: State# RealWorld). putStrLn (reverse x) s }}} which is much more efficient. Indeed, this might not be so good if the calls looked like {{{ ... replicateM_ 1000 (pr "foo")... }}} because then "foo" will be reversed 1000 times. But arguably that's what the programmer expects anyway, looking at the code; and the efficiency hit from not eta-expanding all functions like `pr` (which are very very common) is significant. The point is the that the only ones that need hacking are the top-level guys, and maybe even the top-level ''exported'' guys. I have not fully thought this through, let alone tried it out, but I wanted to capture the thought. It would need some careful performance testing. Simon -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9388> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8280: Deriving Show for Word#
by GHC 21 Feb '15

21 Feb '15

#8280: Deriving Show for Word# ------------------------------------+------------------------------------- Reporter: monoidal | 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: | ------------------------------------+------------------------------------- {{{ {-# LANGUAGE MagicHash #-} import GHC.Prim data A = A Word# deriving Show }}} This works in 7.6.3, but 7.7 gives {{{ Can't find interface-file declaration for data constructor GHC.Types.W# Probable cause: bug in .hi-boot file, or inconsistent .hi file Use -ddump-if-trace to get an idea of which file caused the error }}} The same file works if Word# is replaced by Int#. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8280> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9054: runghc-<version> does not call ghc of the same version
by GHC 18 Feb '15

18 Feb '15

#9054: runghc-<version> does not call ghc of the same version ------------------------------------+------------------------------------- Reporter: EyalLotem | Owner: Type: bug | 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: | ------------------------------------+------------------------------------- When I ran runghc-7.6.3, it actually executed "/usr/local/bin/ghc" which points to ghc-7.8.2. The offending line is inside the runghc-<version> script: {{{ exec "$executablename" -f "$bindir/ghc" ${1+"$@"} }}} Which should be: {{{ exec "$executablename" -f "$bindir/ghc-<version>" ${1+"$@"} }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9054> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9402: Vestigial external core code in genprimops
by GHC 18 Feb '15

18 Feb '15

#9402: Vestigial external core code in genprimops -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- It looks like `gen_ext_core_source` in `utils/genprimopcode/Main.hs` is no longer needed. I'm not quite confident enough here to make the change myself, though. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9402> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9606: Improve outdated ghc-pkg cache warning
by GHC 18 Feb '15

18 Feb '15

#9606: Improve outdated ghc-pkg cache warning -------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: ghc-pkg | Version: 7.8.2 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Easy (less than 1 | Type of failure: hour) | None/Unknown Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Sometimes you get this: {{{ WARNING: cache is out of date: /home/user/.ghc/x86_64-linux-7.8.3/package.conf.d/package.cache. Use 'ghc-pkg recache' to fix }}} The warning is correct but a bit confusing, because running `ghc-pkg recache` does nothing here: It will by default update your global package DB, and the DB the warning is about will still be out of date. This seems to have frustrated others as well: https://gist.github.com/mcandre/5789498 I suggest we make the message more clear: `You might have to pass --user to update this cache file`. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9606> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9094: remove RAW_CPP
by GHC 18 Feb '15

18 Feb '15

#9094: remove RAW_CPP ------------------------------------+------------------------------------- Reporter: carter | Owner: Type: task | Status: new Priority: normal | Milestone: 7.10.1 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: 8683 | Blocking: Related Tickets: #8683 | ------------------------------------+------------------------------------- once the CPP settings ticket is merged #8683 one cleanup task is to remove the RAW_CPP bits from the ghc build system because they're not longer needed -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9094> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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