XL Fortran Enterprise Edition for AIX : User's Guide - IBM

-F Option
Syntax
-Fconfig_file | -Fconfig_file:stanza | -F:stanza
Specifies an alternative configuration file, which stanza to use within the
configuration file, or both.
The configuration file specifies different kinds of defaults, such as options for
particular compilation steps and the locations of various files that the compiler
requires. A default configuration file (/etc/xlf.cfg) is supplied at installation time.
The default stanza depends on the name of the command used to invoke the
compiler (xlf90, xlf90_r, xlf90_r7, xlf95, xlf95_r, xlf95_r7, xlf, xlf_r, xlf_r7, f77, or
fort77).
A simple way to customize the way the compiler works, as an alternative to
writing complicated compilation scripts, is to add new stanzas to /etc/xlf.cfg,
giving each stanza a different name and a different set of default compiler options.
You may find the single, centralized file easier to maintain than many scattered
compilation scripts and makefiles.
By running the compiler with an appropriate -F option, you can select the set of
options that you want. You might have one set for full optimization, another set
for full error checking, and so on.
Restrictions
Because the default configuration file is replaced each time a new compiler release
is installed, make sure to save a copy of any new stanzas or compiler options that
you add.
Examples
# Use stanza debug in default xlf.cfg.
xlf95 -F:debug t.f
# Use stanza xlf95 in /home/fred/xlf.cfg.
xlf95 -F/home/fred/xlf.cfg t.f
# Use stanza myxlf in /home/fred/xlf.cfg.
xlf95 -F/home/fred/xlf.cfg:myxlf t.f
Related Information
“Customizing the Configuration File” on page 15 explains the contents of a
configuration file and tells how to select different stanzas in the file without using
the -F option.
XL Fortran Compiler-Option Reference 107