[arekm@arm ~/rpm/SPECS]$ rpm -E "%{_host_vendor}"
pld
[arekm@arm ~/rpm/SPECS]$ rpm -E "%{_target_vendor}"
unknown
[arekm@arm ~/rpm/SPECS]$ rpm -E "%{_host_vendor}"
pld
[arekm@arm ~/rpm/SPECS]$ grep _target_vendor /usr/lib/rpm/*
/usr/lib/rpm/macros:%_target_vendor             %{_host_vendor}
[arekm@arm ~/rpm/SPECS]$ grep _target_vendor /usr/lib/rpm/*/*
zsh: exit 1     grep _target_vendor /usr/lib/rpm/*/*
[arekm@arm ~/rpm/SPECS]$ grep -E "(_host_vendor|_target_vendor)" /usr/lib/rpm/*
/usr/lib/rpm/macros:%_build_vendor              %{_host_vendor}
/usr/lib/rpm/macros:%_host_vendor               pld
/usr/lib/rpm/macros:%_target_vendor             %{_host_vendor}