[pymvpa] Seg on OSX when using libsvm

[Fabian Pedregosa]

Yaroslav Halchenko wrote:
> Wow -- nice finding Fabian!
> I wonder what should be the resolution... and why even the confusion
> since shogun's SVC_Q lies in shogun space (not sure how well that is
> represented in dynamic library, or may be on your box shogun/libsvm and
> pymvpa were built with DYLD_FORCE_FLAT_NAMESPACE or smth like that)
> 
> Unfortunately it isn't the case of the segfaults I can reproduce :-/
> (if you have a moment/desire -- try running the unittests extract which
> supposed to trigger it)

Thanks Yaroslav for your help. It's probably a miscompilation issue on 
my part (I'm doing some LibSVM development), so I wouldn't spend much 
time on this.

I'll update my system (macports), and I'll insist if the problem persists.

Thanks,

fabian


> 
> On Tue, 09 Mar 2010, Fabian Pedregosa wrote:
>> Thanks for looking at this. I solved the problem by uninstalling
>> shogun. It seems the problem was due to name clashing between libsvm
>> & shogun. The stack trace is interesting:
> 
> 
>> 0   libshogun.4.dylib             	0x03f87656 SVC_Q::get_Q(int, int)
>> const + 54
>> 1   libsvm.dylib                  	0x0425ecd9
>> Solver::select_working_set(int&, int&) + 777
>> 2   libsvm.dylib                  	0x0426109a Solver::Solve(int,
>> QMatrix const&, double const*, signed char const*, double*, double,
>> double, double, Solver::SolutionInfo*, int) + 778
> 
>> which means it 'jumps' from libsvm to shogun (I have no clue why
>> this happens)
> 
> 
> 
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