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

c89, cc, and c++
to specify a library multiple times on the command string, if subsequent
specification of file.o files requires that additional symbols be resolved from
that library.
9. When the prelinker is used during the link-editing phase, you cannot use as
input to c89/cc/c++ an executable file produced as output from a previous use
of c89/cc/c++. The output of c89/cc/c++ when the -r option is specified (which
is not an executable file) may be used as input.
10. All MVS data sets used by c89/cc/c++ must be cataloged (including the
system data sets installed with the z/OS XL C/C++ compiler and the Language
Environment run-time library).
11. c89/cc/c++ operation depends on the correct setting of their installation and
configuration environment variables (see “Environment variables” on page 84).
Also, they require that certain character special files are in the /dev directory.
For additional installation and configuration information, see z/OS UNIX
System Services Planning.
12. Normally, options and operands are processed in the order read (from left to
right). Where there are conflicts, the last specification is used (such as with -g
and -s). However, some c89/cc/c++ options will override others, regardless of
the order in which they are specified. The option priorities, in order of highest
to lowest, are as follows:
-v specified twice
The pseudo-JCL is printed only, but the effect of all the other options
and operands as specified is reflected in the pseudo-JCL.
-E Overrides -0, -O, -1, -2, -3, -V, -c, -g and -s (also ignores any file.s
files).
-g Overrides -0, -O, -1, -2, -3, and -s.
-s Overrides -g (the last one specified is honored).
-0 (zero), -O (capital letter O), -1, -2, -3, -V, -c
All are honored if not overridden. -0, -O, -1, -2, -3 override each other
(the last one specified is honored).
Note: The preferred way for specifying optimization options, is -O
(capital letter O) followed by a number; for example, -O2.
13. For options that have option-arguments, the meaning of multiple specifications
of the options is as follows:
100 z/OS V1R9.0 UNIX System Services Command Reference
-D All specifications are used. If the same name is specified on more than
one -D option, only the first definition is used.
-e The entry function used will be the one specified on the last -e option.
-I All specifications are used. If the same directory is specified on more
than one -I option, the directory is searched only the first time.
-L All specifications are used. If the same directory is specified on more
than one -L option, the directory is searched only the first time.
-o The output file used will be the one specified on the last -o option.
-U All specifications are used. The name is not defined, regardless of the
position of this option relative to any -D option specifying the same
name.
-u All specifications are used. If a definition cannot be found for any of
the functions specified, the link-editing phase will be unsuccessful.