[SciPy-Dev] segfault in test_qhull.TestRidgeIter2D.test_complicated
Mon Nov 15 19:39:45 CST 2010
On Mon, Nov 15, 2010 at 5:27 PM, Pauli Virtanen <firstname.lastname@example.org> 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:
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?
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