when gcc support -z ?

hello, all just like the title, when gcc support -z keyword? if show me the patch, it will be great. thx -- 业精于勤,荒于嬉..

gcc-7-20160522 is now available

Snapshot gcc-7-20160522 is now available on ftp://gcc.gnu.org/pub/gcc/snapshots/7-20160522/ and on various mirrors, see http://gcc.gnu.org/mirrors.html for details. This snapshot has been generated from the GCC 7 SVN branch with the following options: svn://gcc.gnu.org/svn/gcc/trunk revision