HP Fortran Programmer's Guide (March 2010)

Chapter 9 213
9 Using Fortran directives
Compiler directives are commands within the source program that affect how the program is
compiled. They are similar in function to command-line options, but generally provide more
local control. The directives provided by HP Fortran use a syntax that causes them to be
treated as comments (and so ignored) when ported to another processor or when incorrectly