CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le Tuesday 12 November 2013 18:21:41 Daniel Russel a écrit :
> We recently started getting memory corruption errors during hilbert sorting
> when building regular triangulation on fedora 19 (gcc 4.82). This occurs
> with cgal 4.2 and 4.3. The .cpp, build command and outputs under normal
> running and valgrind are attached.
> 
> The disabling of the rounding check is to that things can run in valgrind,
> but the output is the same without it. Removing the -DCGAL_USE_GMP and
> -DCGAL_USE_MPFR doesn't make any difference.
> 
> Any suggestions? Thanks.

There is a severe bug in the libstdc++ shipped by g++-4.8:
  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58800

The CGAL spatial sorting uses std::nth_element, and that function, in the 
buggy implementations, can sometime dereference the past-the-end iterator of 
the sequence. There is a patch in the bug report. The bug was so annoying 
that 
I have patched my g++-4.8 system installation by hand.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/