HP Fortran Programmer's Guide (September 2007)

Compiling and linking
Compiling with the f90 command
Chapter 222
where options is a list of one or more command-line options and files is a list of one or more
files containing HP Fortran source code to be compiled or object code to be linked. Items in
options and files can be interspersed on the command line, separated by spaces. However,
some options are order-sensitive. For example, the -l option, which is used to specify a
library for linking, must follow the program file to which it will be linked.
For information about using the -l option, see “Linking to nondefault libraries” on page 78.
For more information about the f90 command line, see HP Fortran Programmer’s Reference.
Command-line options
Command-line options enable you to override the default behavior of the f90 command. Some
options affect how files are compiled or linked; for example, the -O option requests
optimization. Other options may cause the f90 command to skip a process entirely; for
example, the -c option compiles without linking. And still others invoke processes other than
the default ones; for example, the +cpp=yes option causes the f90 command to send source
files to the C preprocessor (cpp) before compiling. (For information about using cpp, see
“Using the C preprocessor” on page 89.)
Many options are of the form +[no] option , where + option enables the option’s functionality
and +no option disables it. Other options have more than just an on or off state; these are of
the form + option = arg . You can cause f90 to list the values for arg on stderr by specifying
just the option name without an argument. For example, given the command line:
$ f90 +langlvl= prog.f90
f90 will issue the following message:
f90: The '+langlvl=' option requires
one of the following sub-options:
90 generate messages about non-FORTRAN 90 features
default no messages about nonstandard FORTRAN features
Still other options take a name as an argument. For example, the -o name option specifies the
name you want to give to the output file. If you misspell an option on the f90 command line,
the driver looks for options that are similar to the one you entered and lists them as possible
alternatives on stderr. It meanwhile compiles the program without the option in question.
For detailed information about the syntax of all the options, see the HP Fortran Programmer’s
Reference. For a brief descriptive list of the options, use the command line:
$ f90 +usage