https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66929
--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Maybe stressing again: this is pretty much a blocker for us because it is > in a 'standard' module which we don't want to modify, and on which all parts > of our code depend. We'd appreciate a reliable and quick fix soon. Did you try the patch in comment 1? AFAICT it fixes the issue without regression.