[SciPy-Dev] segfault in test_qhull.TestRidgeIter2D.test_complicated

Matthew Brett matthew.brett@gmail....
Mon Nov 15 19:39:45 CST 2010


Hi,

On Mon, Nov 15, 2010 at 5:27 PM, Pauli Virtanen <pav@iki.fi> wrote:
> On Mon, 15 Nov 2010 12:07:16 +0000, Pauli Virtanen wrote:
>
>> Mon, 15 Nov 2010 11:10:40 +0100, Jens Nielsen wrote:
>>> I get a segmentation fault at the same point on ubuntu 10.10 both 64
>>> bit and 32 bit versions but only when linking against atlas. Linking
>>> against blas and lapack only is fine.
>>
>> Ok, this bug is absent if Qhull is compiled without optimizations, and
>> present if compiled with -O2.
>>
>> Qhull apparently breaks gcc's strict-aliasing assumptions, and compiling
>> with 'OPT="-fno-strict-aliasing -O2" python setup.py ...' makes it work
>> again. This should probably be enabled by default, or one would need to
>> check if the aliasing issues can be fixed on the source code level.
>
> Ok, source code level "fix" here:
>
> https://github.com/pv/scipy-work/commit/8efed6e403597783243f476c7bdb1c506d99f22b

Thank you - the comments explaining the change are particularly
complete and helpful.   Maybe it would be good to point to these
comments in the source code for the change?

See you,

Matthew


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