Bug#928140: pygalmesh: FTBFS on 32-bit architectures: virtual memory exhausted

[Drew Parsons]

Source: pygalmesh
Followup-For: Bug #928140

Not a regression as such: 0.2.6-1 also exhausts memory on i386
sometimes (not always), cf.
https://tests.reproducible-builds.org/debian/logs/unstable/i386/pygalmesh_0.2.6-1.build2.log.gz

This is a general problem with meshing libraries. mshr has a
similar problem on i386,
https://bitbucket.org/fenics-project/mshr/issues/89/

I spoke with upstream about it, he said the reason will be cgal's
heavy use of c++ templates. No easy way around it.

Building with -g -O1 (or -O2 without -g) helps mshr, we can test if it
helps pygalmesh too.

Drew