#2729: Stuck when compiling XMonad.StackSet in xmonad 0.9 (hackage version)
---------------------------------+------------------------------------------
Reporter: mnislaih | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.11 | Severity: major
Keywords: | Testcase:
Architecture: Unknown/Multiple | Os: Unknown/Multiple
---------------------------------+------------------------------------------
This is the end of the -v output without -O2
{{{
Ready for upsweep
[NONREC
ModSummary {
ms_hs_date = Fri Sep 5 21:53:18 CEST 2008
ms_mod = main:XMonad.StackSet,
ms_imps = [Data.Map, Data.List, Data.List, Data.Maybe, Prelude]
ms_srcimps = []
}]
compile: input file ./XMonad/StackSet.hs
Created temporary directory: /tmp/ghc14177_0
*** Checking old interface for main:XMonad.StackSet:
[1 of 1] Compiling XMonad.StackSet ( XMonad/StackSet.hs,
XMonad/StackSet.o )
*** Parser:
*** Renamer/typechecker:
*** Desugar:
Result size = 7813
*** Simplify:
Result size = 6756
Result size = 6535
Result size = 6511
Result size = 6511
*** Tidy Core:
Result size = 6511
*** CorePrep:
}}}
...and then it stops, consuming full CPU and constant (~27MB) memory.
The output with -O2 is slightly different
{{{
Ready for upsweep
[NONREC
ModSummary {
ms_hs_date = Fri Sep 5 21:53:18 CEST 2008
ms_mod = main:XMonad.StackSet,
ms_imps = [Data.Map, Data.List, Data.List, Data.Maybe, Prelude]
ms_srcimps = []
}]
compile: input file ./XMonad/StackSet.hs
Created temporary directory: /tmp/ghc14187_0
*** Checking old interface for main:XMonad.StackSet:
[1 of 1] Compiling XMonad.StackSet ( XMonad/StackSet.hs,
XMonad/StackSet.o )
*** Parser:
*** Renamer/typechecker:
*** Desugar:
Result size = 7808
*** Simplify:
Result size = 6281
Result size = 6189
Result size = 6189
*** Specialise:
Result size = 6189
*** Float out (not lambdas, not constants):
}}}
I waited for about 30 minutes before killing it.
This problem doesn't seem to be present in the 6.10 branch, so the culprit
must be a relatively recent patch.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2729>
GHC <http://www.haskell.org/ghc/>
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