September 2013 - ghc-tickets

Re: [GHC] #4959: Warning about variables with leading underscore that are used anyway
by GHC 23 Sep '13

23 Sep '13

#4959: Warning about variables with leading underscore that are used anyway -------------------------------------+------------------------------------- Reporter: Lemming | Owner: Type: feature request | Status: new Priority: low | Milestone: 7.10.1 Component: Compiler | Version: 7.0.1 (Parser) | Keywords: warning unused Resolution: | underscore variable Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------- Comment (by goldfire): I don't have too strong an opinion here, but I want to note that sometimes the use of a variable with a leading underscore is intentional. In particular, I have found this necessary when I use CPP to optionally disable a certain chunk. I don't want warnings to appear when I disable the chunk (eliminating the one use of a variable, to which I prepend a `_`) or when I enable the chunk (now using a variable with a leading underscore). So, I have a slight preference for "no change" here, but it really is a slight preference -- I do see and understand the original poster's point. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4959#comment:6> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8344: Problem w/ Monadic when installing hldeger-web on Raspberry Pi
by GHC 23 Sep '13

23 Sep '13

#8344: Problem w/ Monadic when installing hldeger-web on Raspberry Pi ---------------------------+--------------------------------- Reporter: daccle | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.4.1 Keywords: | Operating System: Linux Architecture: arm | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ---------------------------+--------------------------------- Hi Folks! This is what I get when try to install on Raspberry Pi using cabal install hledger-web: {{{ [ 5 of 19] Compiling Data.Vector.Fusion.Stream.Monadic ( Data/Vector/Fusion/Stream/Monadic.hs, dist/build/Data/Vector/Fusion/Stream/Monadic.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for arm-unknown-linux): Cant do annotations without GHCi {Data/Vector/Fusion/Stream/Monadic.hs:104:19-33} base:GHC.Exts.ForceSpecConstr{d ra42} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} I don't have any knowledge on Haskell, so please tell me which data you need else. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8344> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7574: Register allocator chokes on certain branches with literals
by GHC 23 Sep '13

23 Sep '13

#7574: Register allocator chokes on certain branches with literals -------------------------------------+------------------------------------- Reporter: thoughtpolice | Owner: simonmar Type: bug | Status: closed Priority: highest | Milestone: 7.8.1 Component: Compiler (NCG) | Version: 7.7 Resolution: fixed | Keywords: ncg, codegen Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: Compile-time | Difficulty: Unknown crash | Blocked By: 7573 Test Case: | Related Tickets: #7571,#7534, codeGen/should_compile/T7574 | #7814 Blocking: | -------------------------------------+------------------------------------- Changes (by simonmar): * status: new => closed * resolution: => fixed Comment: I believe this is fixed, as always reopen the ticket if there are still problems. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7574#comment:30> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8291: unloadObj doesn't work on Mac OS X
by GHC 23 Sep '13

23 Sep '13

#8291: unloadObj doesn't work on Mac OS X --------------------------+------------------------------------------------ Reporter: ezyang | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: | Version: 7.7 Runtime System | Operating System: MacOS X Keywords: | Type of failure: Incorrect result at runtime Architecture: | Test Case: linker_unload Unknown/Multiple | Blocking: Difficulty: | Unknown | Blocked By: | Related Tickets: | --------------------------+------------------------------------------------ Shows up as the linker_unload test going very slowly and triggering the timeout on my box. Verified by looking at the unloaded_objects list, which contains multiple copies of Test.o. I haven't investigated any further. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8291> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7574: Register allocator chokes on certain branches with literals
by GHC 23 Sep '13

23 Sep '13

#7574: Register allocator chokes on certain branches with literals -------------------------------------+------------------------------------- Reporter: thoughtpolice | Owner: simonmar Type: bug | Status: new Priority: highest | Milestone: 7.8.1 Component: Compiler (NCG) | Version: 7.7 Resolution: | Keywords: ncg, codegen Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: Compile-time | Difficulty: Unknown crash | Blocked By: 7573 Test Case: | Related Tickets: #7571,#7534, codeGen/should_compile/T7574 | #7814 Blocking: | -------------------------------------+------------------------------------- Comment (by Simon Marlow <marlowsd@…>): In [changeset:491551db7dd97454c51b57f1675a74626875e5c3/testsuite]: {{{ #!CommitTicketReference repository="testsuite" revision="491551db7dd97454c51b57f1675a74626875e5c3" T7574 is now passing (#7574) }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7574#comment:29> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8192: Finally remove -fwarn-lazy-unlifted-bindings flag
by GHC 23 Sep '13

23 Sep '13

#8192: Finally remove -fwarn-lazy-unlifted-bindings flag ------------------------------------+------------------------------------- Reporter: thoughtpolice | Owner: thoughtpolice Type: bug | Status: new Priority: normal | Milestone: 7.10.1 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: #8022 | ------------------------------------+------------------------------------- See #8022. We should finally put this flag to rest. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8192> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7574: Register allocator chokes on certain branches with literals
by GHC 23 Sep '13

23 Sep '13

#7574: Register allocator chokes on certain branches with literals -------------------------------------+------------------------------------- Reporter: thoughtpolice | Owner: simonmar Type: bug | Status: new Priority: highest | Milestone: 7.8.1 Component: Compiler (NCG) | Version: 7.7 Resolution: | Keywords: ncg, codegen Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: Compile-time | Difficulty: Unknown crash | Blocked By: 7573 Test Case: | Related Tickets: #7571,#7534, codeGen/should_compile/T7574 | #7814 Blocking: | -------------------------------------+------------------------------------- Comment (by Simon Marlow <marlowsd@…>): In [changeset:f5879acd018494b84233f26fba828ce376d0f81d/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="f5879acd018494b84233f26fba828ce376d0f81d" Discard unreachable code in the register allocator (#7574) The problem with unreachable code is that it might refer to undefined registers. This happens accidentally: a block can be orphaned by an optimisation, for example when the result of a comparsion becomes known. The register allocator panics when it finds an undefined register, because they shouldn't occur in generated code. So we need to also discard unreachable code to prevent this panic being triggered by optimisations. The register alloator already does a strongly-connected component analysis, so it ought to be easy to make it discard unreachable code as part of that traversal. It turns out that we need a different variant of the scc algorithm to do that (see Digraph), however the new variant also generates slightly better code by putting the blocks within a loop in a better order for register allocation. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7574#comment:28> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #5435: GHCi linker should run constructors for linked libraries
by GHC 23 Sep '13

23 Sep '13

#5435: GHCi linker should run constructors for linked libraries -------------------------------------+------------------------------------ Reporter: pumpkin | Owner: Type: bug | Status: closed Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: 7.2.1 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: 7746, 8199 | Related Tickets: #3658 -------------------------------------+------------------------------------ Comment (by Simon Marlow <marlowsd@…>): In [changeset:1908195261ccf16b0f3d2e77ebd5cd40c9e29cbc/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="1908195261ccf16b0f3d2e77ebd5cd40c9e29cbc" Fix linker_unload now that we are running constructors in the linker (#8291) See also #5435. Now we have to remember the the StablePtrs that get created by the module initializer so that we can free them again in unloadObj(). }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5435#comment:40> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4959: Warning about variables with leading underscore that are used anyway
by GHC 23 Sep '13

23 Sep '13

#4959: Warning about variables with leading underscore that are used anyway -------------------------------------+------------------------------------- Reporter: Lemming | Owner: Type: feature request | Status: new Priority: low | Milestone: 7.10.1 Component: Compiler | Version: 7.0.1 (Parser) | Keywords: warning unused Resolution: | underscore variable Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------- Changes (by leroux): * cc: leroux@… (added) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4959#comment:5> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4959: Warning about variables with leading underscore that are used anyway
by GHC 23 Sep '13

23 Sep '13

#4959: Warning about variables with leading underscore that are used anyway -------------------------------------+------------------------------------- Reporter: Lemming | Owner: Type: feature request | Status: new Priority: low | Milestone: 7.10.1 Component: Compiler | Version: 7.0.1 (Parser) | Keywords: warning unused Resolution: | underscore variable Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------- Changes (by hvr): * difficulty: => Unknown * milestone: 7.6.2 => 7.10.1 -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4959#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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