https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80156
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Confirmed. This a regression which appeared between revisions r245767 > (2017-02-28, compiles) and r246000 (2017-03-09, error), > likely r245596 (pr79382). ^^^^^^^obviously wrong!-( I did not find any obvious candidate in the range.