Problem in load path in CVS repository version of Hugs

[Alastair David Reid]

The current Debian package (the rather ancient Feb 2001) loads
Greencard quite correctly:

  /usr/bin/runhugs             -P/home/reid/local/gc-2.01/src: GreenCard.lhs

The version of Hugs in the current CVS repository has problems:

  /home/reid/local/bin/runhugs -P/home/reid/local/gc-2.01/src: GreenCard.lhs
  runhugs: Unable to initialise Hugs

Using hugs instead of runhugs doesn't help but lets me verify that the
-P setting is being seen by Hugs.

  /home/reid/local/bin/hugs -P/home/reid/local/gc-2.01/src: GreenCard.lhs
  __   __ __  __  ____   ___      _________________________________________
  ||   || ||  || ||  || ||__      Hugs 98: Based on the Haskell 98 standard
  ||___|| ||__|| ||__||  __||     Copyright (c) 1994-2001
  ||---||         ___||           World Wide Web: http://haskell.org/hugs
  ||   ||                         Report bugs to: hugs-bugs@haskell.org
  ||   || Version: December 2001  _________________________________________
  
  Haskell 98 mode: Restart with command line option -98 to enable extensions
  
  Reading file "/home/reid/local/share/hugs/lib/Prelude.hs":
  Reading file "GreenCard.lhs":
  ERROR "GreenCard.lhs" - Unable to open file "GreenCard.lhs"
  Prelude> :set
  TOGGLES: groups begin with +/- to turn options on/off resp.
  s    Print no. reductions/cells after eval
  t    Print type after evaluation
  f    Terminate evaluation on first error
  g    Print no. cells recovered after gc
  l    Literate modules as default
  e    Warn about errors in literate modules
  .    Print dots to show progress
  q    Print nothing to show progress
  Q    Qualify names when printing
  w    Always show which modules are loaded
  k    Show kind errors in full
  u    Use "show" to display results
  I    Display results of IO programs
  i    Chase imports while loading modules
  R    Enable root optimisation
  T    print most general type
  
  OTHER OPTIONS: (leading + or - makes no difference)
  hnum Set heap size (cannot be changed within Hugs)
  pstr Set prompt string to str
  rstr Set repeat last expression string to str
  Pstr Set search path for modules to str
  Estr Use editor setting given by str
  cnum Set constraint cutoff limit
  Fstr Set preprocessor filter to str
  
  Current settings: +fewuiRT -stgl.qQkI -h250000 -p"%s> " -r$$ -c40
  Search path     : -P/home/reid/local/gc-2.01/src:/home/reid/local/htmllib:{Hugs}/lib:{Hugs}/lib/hugs:{Hugs}/lib/exts
  Editor setting  : -E"emacsclient +%d %s"
  Preprocessor    : -F
  Compatibility   : Haskell 98 (+98)

Runhugs has no problems if I move to the directory containing the GC
source code first - but this is obviously not a useful workaround.

  cd /home/reid/local/gc-2.01/src
  /home/reid/local/bin/runhugs GreenCard.lhs

I'm assuming that this stems from that changes in the search path code
but haven't tried to track it down.

I haven't tried this on the current release of Hugs - only the current
CVS snapshot.

Is this the desired behaviour?
Is this a known bug?  (I see no mention on the web pages)
Is there a workaround?


-- 
Alastair Reid        reid@cs.utah.edu        http://www.cs.utah.edu/~reid/