# pwd
/var/tmp/portage/sys-devel/gcc-5.4.0-r3/work/gcc-5.4.0

# getfattr ecj.jar
# file: ecj.jar
user.xdg.origin.url

# ls -l ecj.jar 
lrwxrwxrwx 1 portage portage 34 Sep 30 16:15 ecj.jar -> /usr/portage/distfiles/ecj-4.5.jar

# getfattr /usr/portage/distfiles/ecj-4.5.jar
getfattr: Removing leading '/' from absolute path names
# file: usr/portage/distfiles/ecj-4.5.jar
user.xdg.origin.url