CGAL-based CSG meshing broken with GCC 4.8

[Prof Garth Wells]

Most/all CGAL-based 3D mesh generation code fails and throws cryptic errors when using GCC 4.8, for example

demo/documented/csg-3D/
demo/undocumented/curl-curl

[Prof Garth Wells]

This could be related to the STL std::nth_element bug in gcc 4.8.1. See Issue #133.

[Anders Logg (Chalmers)]

Those demos work fine for me with GCC 4.8.1, but I have a (manually) patched std::nth_element. Could you try editing

/usr/include/c++/4.8/bits/stl_algo.h

(or wherever you have it located on your Mac) and edit the following two lines:

std::__move_median_to_first(__first, __first + 1, __mid, (__last - 1));
std::__move_median_to_first(__first, __first + 1, __mid, (__last - 1));

Should be -1 and not -2.

[Prof Garth Wells]

The STL isn't broken on Mac ;-).

[Anders Logg (Chalmers)]

I forgot... Which machine / buildbot is failing for these demos?

[Prof Garth Wells]

Marking this report as invalid as cause appears to be the Ubuntu STL bug for nth_element.