https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87937
--- Comment #12 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- I finally got it: the problem has been introduced in trunk by revision r264358 and fixed by r264725. On the GCC8 branch the problem has been introduced by r264404 and AFAICT the fix has not been back ported. If it helps I can try to apply the path in trunk to my gcc8 build. Note that the problem is not present in 8.2.0.
