#9275: Missing import statement in GHC.Event.Poll ----------------------------------------+---------------------------------- Reporter: ydewit | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.8.2 Resolution: | Keywords: Operating System: MacOS X | Architecture: Type of failure: Building GHC failed | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------+---------------------------------- Description changed by ydewit: Old description:

See the following section from base's GHC.Event.Poll module: {{{ module GHC.Event.Poll ( new , available ) where

#include "EventConfig.h"

#if !defined(HAVE_POLL_H) import GHC.Base

new :: IO E.Backend new = error "Poll back end not implemented for this platform"

available :: Bool available = False {-# INLINE available #-} #else #include

import Control.Concurrent.MVar (MVar, newMVar, swapMVar) import Control.Monad ((=<<), liftM, liftM2, unless) import Data.Bits (Bits, FiniteBits, (.|.), (.&.)) import Data.Maybe (Maybe(..)) import Data.Monoid (Monoid(..)) import Data.Word import Foreign.C.Types (CInt(..), CShort(..)) import Foreign.Ptr (Ptr) import Foreign.Storable (Storable(..)) import GHC.Base import GHC.Conc.Sync (withMVar) import GHC.Enum (maxBound) import GHC.Num (Num(..)) import GHC.Real (ceiling, fromIntegral) import GHC.Show (Show) import System.Posix.Types (Fd(..))

import qualified GHC.Event.Array as A import qualified GHC.Event.Internal as E }}}

Note how there is a missing {{{import qualified GHC.Event.Internal as E}}} when {{{HAVE_POLL_H}}} is not defined.

The same issue is present in master.

New description: See the following section from base's GHC.Event.Poll module: {{{ module GHC.Event.Poll ( new , available ) where #include "EventConfig.h" #if !defined(HAVE_POLL_H) import GHC.Base new :: IO E.Backend new = error "Poll back end not implemented for this platform" available :: Bool available = False {-# INLINE available #-} #else #include import Control.Concurrent.MVar (MVar, newMVar, swapMVar) import Control.Monad ((=<<), liftM, liftM2, unless) import Data.Bits (Bits, FiniteBits, (.|.), (.&.)) import Data.Maybe (Maybe(..)) import Data.Monoid (Monoid(..)) import Data.Word import Foreign.C.Types (CInt(..), CShort(..)) import Foreign.Ptr (Ptr) import Foreign.Storable (Storable(..)) import GHC.Base import GHC.Conc.Sync (withMVar) import GHC.Enum (maxBound) import GHC.Num (Num(..)) import GHC.Real (ceiling, fromIntegral) import GHC.Show (Show) import System.Posix.Types (Fd(..)) import qualified GHC.Event.Array as A import qualified GHC.Event.Internal as E }}} Note how there is a missing {{{import qualified GHC.Event.Internal as E}}} when {{{HAVE_POLL_H}}} is not defined. The same issue is present in master. This is the error seen (note this is a custom haste build): {{{ Building base-4.7.0.0... Preprocessing library base-4.7.0.0... hastec: setNumCapabilities: not supported in the non-threaded RTS GHC/Event/Poll.hsc:18:11: Not in scope: type constructor or class ‘E.Backend’ }}} -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9275#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#9275: Missing import statement in GHC.Event.Poll ----------------------------------------+---------------------------------- Reporter: ydewit | Owner: rwbarton Type: bug | Status: patch Priority: normal | Milestone: Component: libraries/base | Version: 7.8.2 Resolution: | Keywords: Operating System: MacOS X | Architecture: Type of failure: Building GHC failed | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------+---------------------------------- Changes (by rwbarton): * owner: => rwbarton -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9275#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#9275: Missing import statement in GHC.Event.Poll ----------------------------------------+---------------------------------- Reporter: ydewit | Owner: rwbarton Type: bug | Status: closed Priority: normal | Milestone: Component: libraries/base | Version: 7.8.2 Resolution: fixed | Keywords: Operating System: MacOS X | Architecture: Type of failure: Building GHC failed | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------+---------------------------------- Changes (by rwbarton): * status: patch => closed * resolution: => fixed Comment: Thanks, applied. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9275#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler