https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68251
--- Comment #8 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> --- Created attachment 36671 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36671&action=edit reduced testcase thanks, the issue is fixed indeed. Attached is the reduced testcase, about 1000 lines remain, but at least it can be compiled in ~2s.
