December 2016 - ghc-tickets

Re: [GHC] #7206: Implement cheap build
by GHC 14 Dec '16

14 Dec '16

#7206: Implement cheap build -------------------------------------+------------------------------------- Reporter: simonpj | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: ⊥ Component: Compiler | Version: 7.4.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by MikolajKonarski): * cc: MikolajKonarski (added) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7206#comment:19> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #3427: control what sort of entity a deprecated pragma applies to
by GHC 13 Dec '16

13 Dec '16

#3427: control what sort of entity a deprecated pragma applies to -------------------------------------+------------------------------------- Reporter: igloo | Owner: thoughtpolice Type: feature request | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 6.10.4 Resolution: | Keywords: deprecate | warning Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * milestone: 8.2.1 => 8.4.1 Comment: This won't happen for 8.2 although it would be great if someone could pick this up for 8.4. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3427#comment:14> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7860: Add more bit fiddling functions to 'integer-gmp'
by GHC 13 Dec '16

13 Dec '16

#7860: Add more bit fiddling functions to 'integer-gmp' -------------------------------------+------------------------------------- Reporter: lebedev | Owner: hvr Type: feature request | Status: new Priority: normal | Milestone: 8.4.1 Component: Core Libraries | Version: 7.6.3 Resolution: | Keywords: integer-gmp Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #3489, #9835 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by hvr): Just for the record, I did start a couple months ago (http://git.haskell.org/ghc.git/shortlog/refs/heads/wip/T7860) before I shifted attention to more urgent tasks -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7860#comment:20> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #8440: Get rid of the remaining static flags
by GHC 13 Dec '16

13 Dec '16

#8440: Get rid of the remaining static flags -------------------------------------+------------------------------------- Reporter: thoughtpolice | Owner: Type: task | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * milestone: 8.2.1 => 8.4.1 Comment: It is unlikely this will happen for 8.2. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8440#comment:7> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7860: Add more bit fiddling functions to 'integer-gmp'
by GHC 13 Dec '16

13 Dec '16

#7860: Add more bit fiddling functions to 'integer-gmp' -------------------------------------+------------------------------------- Reporter: lebedev | Owner: hvr Type: feature request | Status: new Priority: normal | Milestone: 8.4.1 Component: Core Libraries | Version: 7.6.3 Resolution: | Keywords: integer-gmp Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #3489, #9835 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * milestone: 8.2.1 => 8.4.1 Comment: It doesn't look like this will happen for 8.2. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7860#comment:19> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9696: readRawBufferPtr and writeRawBufferPtr allocate memory
by GHC 13 Dec '16

13 Dec '16

#9696: readRawBufferPtr and writeRawBufferPtr allocate memory -------------------------------------+------------------------------------- Reporter: mergeconflict | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Keywords: | Operating System: Architecture: x86_64 (amd64) | Unknown/Multiple Difficulty: Unknown | Type of failure: Runtime Blocked By: | performance bug Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- I initially filed this as a [http://stackoverflow.com/questions/26333815 /why-do-hgetbuf-hputbuf-etc-allocate-memory question on StackOverflow], assuming that the behavior I'm seeing was intentional, or that I was misinterpreting the profiler results... but Kazu Yamamoto [https://twitter.com/kazu_yamamoto/status/522583112249663488 suggested] I should file this as an issue here. It's my first GHC ticket, so here goes: {{{#!hs main :: IO () main = do buf <- mallocArray 1 echo buf echo :: Ptr Word8 -> IO () echo buf = forever $ do len <- readRawBufferPtr "read" stdin buf 0 1 writeRawBufferPtr "write" stdout buf 0 (fromIntegral len) }}} I expect the only heap allocation here should be my explicit `mallocArray`, but profiling with `+RTS -P` indicates this isn't the case: both the read and write operations do appear to allocate some short-lived heap objects. In contrast: {{{#!hs echo :: Ptr Word8 -> IO () echo buf = forever $ do threadWaitRead $ Fd 0 len <- c_read 0 buf 1 c_write 1 buf (fromIntegral len) yield }}} does not appear to allocate. I did a bit of digging (copying bits of source code from `base` into my own project, to get cost center annotations) and it seems like the allocation might be happening in `throwErrnoIfRetryMayBlock`. See [https://gist.github.com/anonymous/3ba3cfa118e1d05870d4 this gist] for more detail, including core output from `-ddump-simpl`. In all honesty, I don't know whether this is a bug. I was just surprised by it, when I first encountered it using `hGetBuf` / `hPutBuf`, so I'm trying to understand whether this is expected behavior and why. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9696> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12956: Something has broken T12903
by GHC 13 Dec '16

13 Dec '16

#12956: Something has broken T12903 --------------------------------------+--------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Runtime System | Version: 8.0.1 Keywords: | Operating System: MacOS X Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+--------------------------------- 895a131f6e56847d9ebca2e9bfe19a3189e49d72, which fixes #12903, seems to be broken on OS X. The tree was known to compile at 499e43824bda967546ebf95ee33ec1f84a114a7c and is known to be broken at 61932cd3eb0d5d22cb35d118fb9f87298881cd77. I'll need to figure out which of the intervening commits broken it -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12956> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12550: Inconsistent unicode display for kinds
by GHC 13 Dec '16

13 Dec '16

#12550: Inconsistent unicode display for kinds --------------------------------------+--------------------------------- Reporter: johnleo | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: MacOS X Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+--------------------------------- With `:set -fprint-unicode-syntax`, the kind `*` should always be printed as `★`. However the output is extremely inconsistent. Here are a few examples from ghci, and I will add more as I run across them. {{{ :t fmap fmap ∷ ∀ {f ∷ ★ → ★} {a} {b}. Functor f ⇒ (a → b) → f a → f b :i fmap class Functor (f ∷ * → *) where fmap ∷ forall a b. (a → b) → f a → f b :k Functor Functor ∷ (★ → ★) → Constraint :m + GHC.Generics :i Functor -- (among other output) instance ∀ (f ∷ * → ★). Functor f ⇒ Functor (Rec1 f) -- Defined in ‘GHC.Generics’ instance Functor Par1 -- Defined in ‘GHC.Generics’ instance ∀ i (c ∷ Meta) (f ∷ * → ★). Functor f ⇒ Functor (M1 i c f) -- Defined in ‘GHC.Generics’ instance ∀ i c. Functor (K1 i c) -- Defined in ‘GHC.Generics’ instance ∀ (f ∷ * → ★) (g ∷ * → *). (Functor f, Functor g) ⇒ Functor (f :.: g) -- Defined in ‘GHC.Generics’ instance ∀ (f ∷ * → ★) (g ∷ * → ★). (Functor f, Functor g) ⇒ Functor (f :+: g) -- Defined in ‘GHC.Generics’ instance ∀ (f ∷ * → ★) (g ∷ * → ★). (Functor f, Functor g) ⇒ Functor (f :*: g) -- Defined in ‘GHC.Generics’ :t datatypeName datatypeName ∷ ∀ {d} {t ∷ ★ → (* → *) → ★ → ★} {f ∷ * → *} {a}. Datatype ★ d ⇒ t d f a → [Char] :i datatypeName class Datatype k (d ∷ k) where datatypeName ∷ forall {k1} (t ∷ k → (* → *) → k1 → *) (f ∷ * → *) (a ∷ k1). t d f a → [Char] ... -- Defined in ‘GHC.Generics’ }}} Note that `:t datatypeName` causes a panic in 8.1; I have filed a separate bug [https://ghc.haskell.org/trac/ghc/ticket/12549] -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12550> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12880: Update to Cabal-1.24.1.1
by GHC 13 Dec '16

13 Dec '16

#12880: Update to Cabal-1.24.1.1 -------------------------------------+------------------------------------- Reporter: hvr | Owner: Type: task | Status: new Priority: high | Milestone: 8.0.2 Component: libraries | Version: 8.0.2-rc1 (other) | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This is a tracking ticket to make sure it we don't forget about this. See https://github.com/haskell/cabal/issues/4123 -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12880> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12894: Bump directory
by GHC 13 Dec '16

13 Dec '16

#12894: Bump directory -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: high | Milestone: 8.0.2 Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- dcoutts says that `canonicalizePath` in the version shipped with 8.0.1 is buggy. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12894> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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