gcc uses an insecure random number generator. The POWER9 “DARN” RNG intrinsic produces repeated output.
lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html
lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html
access.redhat.com/errata/RHSA-2020:0924
access.redhat.com/security/updates/classification/#moderate
gcc.gnu.org/bugzilla/show_bug.cgi?id=91481