[ ghc-Bugs-1012157 ] -caf-all bugs

Bugs item #1012157, was opened at 2004-08-19 07:52
Message generated for change (Comment added) made by pimlott
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Category: Profiling
Group: 6.2.1
Status: Open
Resolution: None
Priority: 3
Submitted By: Simon Marlow (simonmar)
Assigned to: Simon Marlow (simonmar)
Summary: -caf-all bugs

Initial Comment:
P.C.Callaghan [p.c.callaghan@xxxxxxxxxxxx] submitted
this bug: 

I'm trying to use the -caf-all flag with ghc-6.02, in
conjunction with -O
(which means going via C...)

But in a few modules of a large program, the .hc files
contain duplicate
definitions of "MODsat_CAF_cc_ccs" (where MOD = a
particular module)

I can't see an obvious pattern to the number of
duplications. All the
affected modules use MPCs heavily. It doesn't look like
the duplications
are 1-1 with the instance decls. It only happens on a
few modules out
of many which also use classes heavily.

NB I hand-patched the .hc files by hand, and in the
results, not much of
the dictionary/caf info showed up! Should -auto-dicts work?



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Comment By: Andrew Pimlott (pimlott)
Date: 2005-08-09 15:23

Message:
Logged In: YES 
user_id=498741

This problem is easily reproduced with GHC 6.4.  Just put
"main = return ()" in try.hs, then

    % ghc -prof -caf-all try.hs         
    /tmp/ghc27311.hc:155: error: redefinition of
?Mainmain_CAF_cc_ccs?
    /tmp/ghc27311.hc:150: error: previous definition of
?Mainmain_CAF_cc_ccs? was here


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