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

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xlc and xlC
1. search places defined in the customizable defaults module
(CCNEDFLT)
2. followed by those specified on the command line using the -I flag
option
3. followed by those specified in the configuration file
v If the -qnosearch is specified only in the configuration file:
1. search places specified on the command line using the -I flag option
2. followed by those specified in the configuration file
v If the -qnosearch option is specified on the command line:
1. search places specified on the command line following the last
specified -qnosearch option
2. followed by those specified in the configuration file
Tailoring a configuration file
The default configuration file is installed in /usr/lpp/cbclib/xlc/etc/xlc.cfg.
You can copy this file and make changes to the copy to support specific compilation
requirements or to support other C or C++ compilation environments. The -F option
is used to specify a configuration file other than the default. For example, to make
-qnoro the default for the xlC compiler invocation command, add -qnoro to the xlC
stanza in your copied version of the configuration file.
You can link the compiler invocation command to several different names. The
name you specify when you invoke the compiler determines which stanza of the
configuration file the compiler uses. You can add other stanzas to your copy of the
configuration file to customize your own compilation environment.
Only one stanza, in addition to the one referenced by the ″use″ attribute, is
processed for any one invocation of the xlc utility. By default, the stanza that
matches the command name used to invoke the xlc utility is used, but it can be
overridden using the -F flag option as described in the example below.
Example: You can use the -F option with the compiler invocation command to
make links to select additional stanzas or to specify a stanza or another
configuration file:
xlC myfile.C -Fmyconfig:SPECIAL
would compile myfile.C using the SPECIAL stanza in a myconfig configuration file
that you had created.
Default configuration file
The default configuration file, (/usr/lpp/cbclib/xlc/etc/xlc.cfg.), specifies information
that the compiler uses when you invoke it. This file defines values used by the
compiler to compile C or C++ programs. You can make entries to this file to support
specific compilation requirements or to support other C or C++ compilation
environments. Options specified in the configuration file override the default settings
of the option. Similarly, options specified in the configuration file are in turn
overridden by options set in the source file and on the command line. Options that
do not follow this scheme are listed in “Specifying compiler options” on page 812.
Example: The following example shows a default configuration file:
*
* FUNCTION: z/OS 1.9 XL C/C++ Compiler Configuration file
*
804 z/OS V1R9.0 UNIX System Services Command Reference