#3542: ghc-cabal deadlocks
-------------------------------+--------------------------------------------
Reporter: igloo | Owner:
Type: bug | Status: new
Priority: high | Milestone: 6.12.1
Component: Build System | Version: 6.10.4
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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Trying to build an OS X installer is currently deadlocking when
{{{
inplace/bin/ghc-cabal install
/Users/ian/ghc/6.12-branch/val/dest/Users/ian/ghc/6.12-branch/val/inst/lib/ghc-6.12.0.20090925
/ghc-stage2
/Users/ian/ghc/6.12-branch/val/dest/Users/ian/ghc/6.12-branch/val/inst/lib/ghc-6.12.0.20090925
/ghc-pkg
/Users/ian/ghc/6.12-branch/val/dest/Users/ian/ghc/6.12-branch/val/inst/lib/ghc-6.12.0.20090925
compiler stage2 /Users/ian/ghc/6.12-branch/val/dest
/Users/ian/ghc/6.12-branch/val/inst
/Users/ian/ghc/6.12-branch/val/inst/lib/ghc-6.12.0.20090925
/Users/ian/ghc/6.12-branch/val/inst/share/doc/ghc/html/libraries
}}}
runs:
{{{
/Users/ian/ghc/6.12-branch/val/dest/Users/ian/ghc/6.12-branch/val/inst/lib/ghc-6.12.0.20090925
/ghc-pkg --global-conf
/Users/ian/ghc/6.12-branch/val/dest/Users/ian/ghc/6.12-branch/val/inst/lib/ghc-6.12.0.20090925/package.conf.d
--force update - --global
}}}
Linking `ghc-cabal` with `-threaded` fixes the problem. I believe the
problem is that when we are using a `DESTDIR` we get a large amount of
warnings (more than a buffer full) like:
{{{
ghc-6.12.0.20090925: file AsmCodeGen.hi is missing (ignoring)
}}}
so Cabal's `Distribution.Simple.Utils.rawSystemStdin`:
{{{
_ <- forkIO $ do _ <- evaluate (length err); return ()
_ <- forkIO $ do _ <- evaluate (length out); return ()
-- push all the input
hPutStr inh input
hClose inh
-- wait for the program to terminate
exitcode <- waitForProcess pid
unless (exitcode == ExitSuccess) (die err)
}}}
deadlocks unless it is compiled with `-threaded`, as the forked evaluate
threads don't get a chance to run.
The simple fix is to link with `-threaded`, but I'm not sure that we want
to assume that `-threaded` works - especially as it needs to work in the
bootstrapping compiler.
Can we eliminate calls to this, and any other problematic, functions?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3542>
GHC <http://www.haskell.org/ghc/>
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