You
can specify compile-time options in the three places described in
the following sections. Each successive place overrides the options
specified in the previous place, starting with the defaults as a
base.
Note:
After PL/I determines the compile-time option settings
to use in compilation, individual source statements in your program
might further modify the effect of various compile-time options.
For example, specifying OPTION(BYVALUE) in the program takes precedence
over the DEFAULT(BYVALUE) compile-time option.