https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68778
--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- I see the valgrind errors in comment 4 up to r241883 (2016-11-06). From r241924 (2016-11-07) up to r265319 (2018-10-19) I don't see them anymore but a lot of MacOS related libraries. Finally after r265571 (2018-10-28) valgrind doesn't report any error as well as 7.4.1, 8.3.1, 9.2.1, 10.0.0, and 11.0.0.