Comment # 6 on bug 61 from Iain Buclaw

Please raise a new issue as that is the third 🐛 in mentioned in this report.

The original was an ICE (not segv) in build_dtype, the second commit fixed an
ICE in lto because common types weren't aligned, so your problem is unrelated.

(also not least because you are running a very different compiler from the
version in this report)