Current situation

On every emerge operation the following message is printed:

!!! Your current profile is deprecated and not supported anymore.
!!! Use eselect profile to update your profile.
!!! Please upgrade to the following profile if possible:

        default/linux/amd64/17.1/no-multilib/hardened

To upgrade do the following steps:

The amd64 17.1 profiles switch to a more standard 'no SYMLINK_LIB'
multilib layout, and require an explicit migration.
The migration is performed using the app-portage/unsymlink-lib tool.
The following steps can be used to upgrade your system:

Impact

Annoying and unsupported upstream.

Ideal future situation

flatcar profile upgraded to 17.1.

Additional information

The only real difference between 17.0 and 17.1 profiles is defaulting to "SYMLINK_LIB=no" (instead of "yes"), which affects whether lib is a symlink to lib64 or a proper directory. The arm64 profiles already use SYMLINK_LIB=no. There might be a couple spots in ebuilds and SDK thataccidentally rely on the symlink, but we can weed them out.