z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

xlc and xlC
5. -Bprefix and -tprograms options override the path names of
the programs that are specified inside the configuration file
indicated by the -Fconfig_file option.
Example: To compile myprogram.c using a substitute compiler
and binder from /lib/tmp/mine/, enter:
xlc myprogram.c -B/lib/tmp/mine/
Example: To compile myprogram.c using a substitute binder
from /lib/tmp/mine/, enter:
xlc myprogram.c -B/lib/tmp/mine/ -tl
-F Names an alternative configuration file (.cfg) for the xlc utility.
Suboptions are:
v config_file (specifies the name of an xlc configuration file.)
v stanza (specifies the name of the command used to invoke the
compiler. This directs the compiler to use the entries under
stanza in the config_file to set up the compiler environment.)
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-F
Notes:
config_file
:
stanza
:
stanza
1. The default configuration file supplied at installation time is
called /usr/lpp/cbclib/xlc/etc/xlc.cfg. Any file names or stanzas
that you specify on the command line override the defaults
specified in the /usr/lpp/cbclib/xlc/etc/xlc.cfg configuration file.
2. The -B, -t, and -W options override entries in the configuration
file indicated by the -F option.
Example: To compile myprogram.c using a configuration file called
/usr/tmp/mycbc.cfg, enter:
xlc myprogram.c -F/usr/tmp/mycbc.cfg
-O Optimizes generated code.
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-O
-O2 Same as -O.
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-O2
-O3 Performs some memory and compile time intensive optimizations in
addition to those executed with -O2. The -O3 specific optimizations
have the potential to alter the semantics of a user’s program. The
compiler guards against these optimizations at -O2 and the option
-qstrict is provided at -O3 to turn off these aggressive
optimizations.
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-O3
-O4 Equivalent to -O3 -qipa and -qhot.
810 z/OS V1R9.0 UNIX System Services Command Reference
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