The bug with failed tests is resolved upstream since March 2020, there is no need to filter out the flag --enable-stack-protector=all At the moment, you need to do the following: /etc/portage/env/sys-libs/glibc # make sure to use ssp all EXTRA_ECONF="--enable-stack-protector=all" Please, make sure the flag is not filtered, i.e. in flag-o-matic.eclass Upstream fix: https://sourceware.org/bugzilla/show_bug.cgi?id=25680 Thanks to Dave for the patch!
Sorry, since March 2021 is correct.