[ERROR] Too many arguments (first extra is
  ''--init-file=/var/tmp/portage/dev-db/mysql-5.7.12/temp/tmp.COaXRiJpf9'').

initialize_options="--initialize-insecure  '--init-file=${sqltmp}'"

layman --sync ALL
emerge --sync

/usr/portage/dev-db
/usr/portage/eclass
/usr/portage/virtual/mysql
/var/lib/layman/mysql/dev-db
/var/lib/layman/mysql/eclass
/var/lib/layman/mysql/metadata
/var/lib/layman/mysql/profiles
/var/lib/layman/mysql/virtual

Performing Global Updates
(Could take a couple of minutes if you have a lot of binary packages.)
  .='update pass'  *='binary update'  #='/var/db update'  @='/var/db move'
  s='/var/db SLOT move'  %='binary move'  S='binary SLOT move'
  p='update /etc/portage/package.*'
/var/lib/layman/mysql/profiles/updates/3Q-2014.