I got some input from compiler gurus. It seems that the corresponding upstream bug is: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52830 (And this may be the same issue: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91590 )
Alex Coplan has added a reduced testcase to 52380 derived from the polymake codebase, which ICEs all the way back to GCC 6, so this has been around for a while. (Thanks for investigating, Alex) Wookey -- Principal hats: Linaro, Debian, Wookware, ARM http://wookware.org/
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