Using clang generates the unused-function warning on embedded like:

FAILED: libmysqld/CMakeFiles/sql_embedded.dir/__/sql/sql_acl.cc.o
/usr/lib64/ccache/clang++ .... libmysqld/CMakeFiles/sql_embedded.dir/__/sql/sql_acl.cc.o -MF libmysqld/CMakeFiles/sql_embedded.dir/__/sql/sql_acl.cc.o.d -o libmysqld/CMakeFiles/sql_embedded.dir/__/sql/sql_acl.cc.o -c /home/dan/repos/mariadb-server-10.11/sql/sql_acl.cc

sql_acl.cc:113:20: error: unused function 'is_public' [-Werror,-Wunused-function]
static inline bool is_public(const LEX_USER *l) { return is_public(&l->user); }