-caf-all bugs

[simonmar]

P.C.Callaghan [p.c.callaghan@durham.ac.uk] 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?

[pimlott]

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

[igloo]

See also 931 for another example of the problem. Tested by prof001 and prof002.

[simonmar]

Now fixed. To merge:

Wed Feb 28 07:50:09 PST 2007  Simon Marlow <simonmar@microsoft.com>
  * Fix #249 (-caf-all bugs)

and in the testsuite:

Wed Feb 28 15:51:29 GMT 2007  Simon Marlow <simonmar@microsoft.com>
  * prof001 & prof002 are not broken now

[igloo]

Merged.