HP Fortran Programmer's Guide (September 2007)
An overview of HP Fortran
C preprocessor
Chapter 16
C preprocessor
HP Fortran source files can include directives that the C preprocessor (cpp) reads and
expands before the program is passed to the compiler. Among other things, cpp directives
enable you to code parts of your program for conditional compilation. By default, the f90
command passes source files ending in the.F extension to the C preprocessor.
Table 1-2 lists and briefly describes the options for controlling the preprocessor, including the
+cpp option, which overrides the default behavior and passes all source files on the command
line to the preprocessor. For additional information, see “Using the C preprocessor” on page 89
and the cpp(1) man page.
Table 1-2 Options for controlling the C preprocessor
Option Function
+cpp={yes|no|default} Invoke the C preprocessor. +cpp=yes passes all
source files to the preprocessor. +cpp=default
passes only files ending in the .F extension.
+cpp=no suppresses passing any files. The default
is +cpp=default.
+[no]cpp_keep Retain [discard] output from the C preprocessor. If
the source filename is
file
.f or
file
.F, output is
stored in
file
.i; if the source filename is
file
.f90, the output filename is
file
.i90. The
default, +nocpp_keep, is to discard the output.
-D
name
[=
def
] Define the symbol
name
to the preprocessor. If
def
is specified,
name
is defined to that value.
-I
directory
Add
directory
to the list of directories searched
for files specified in include directives. The
command line can have multiple occurrences of this
option, each specifying a different directory.
-U
name
Remove any initial definition of
name
, a reserved
symbol that is predefined by the preprocessor.