https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128587
--- Comment #3 from David C. Rankin <drankinatty at gmail dot com> --- I've tried to pair it down to a minimum example, but frustratingly it doesn't show up. I can provide the full code, It's only two-sources and a header, probably no more than 2k tar.bz2 compressed. I'll do that as soon as I'm done here.
