The result of getopt() should be compared to -1, not EOF, per

contrib/dbase/dbf2pg.c

contrib/oid2name/oid2name.c

contrib/pgbench/pgbench.c

src/backend/bootstrap/bootstrap.c

src/backend/postmaster/postmaster.c

src/backend/tcop/postgres.c

src/bin/pg_dump/pg_restore.c

src/interfaces/ecpg/preproc/ecpg.c