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

c89, cc, and c++
6. The default LANGLVL and related compiler options are set according to
whether cc, c89, or c++ (cxx) was invoked. These options affect various
aspects of the compilation, such as z/OS XL C/C++ predefined macros, which
are used like feature test macros to control which symbols are made visible in
a source file (typically a header file), but are normally not defined or undefined
except by this compiler option. They can also affect the language rules used
by the compiler. For more information about the compiler options listed here,
see z/OS XL C/C++ User’s Guide . For more information about z/OS XL C/C++
predefined macros, see z/OS XL C/C++ Language Reference. The options are
shown here in a syntax that the user can specify on the c89/cc/c++ command
line to override them:
v c89 (also c++ (cxx) when using a C++ compiler older than z/OS v1r2)
-W "c,langlvl(ansi),noupconv"
v c++ (cxx)
-W "c,langlvl(extended,nolibext,nolonglong)
v cc
-W "c,langlvl(commonc),upconv"
7. By default the usual place for the -L option search is the /lib directory
followed by the /usr/lib directory. See the description of environment variable
prefix_LIBDIRS for information on customizing the default directories to search.
The archive libraries libc.a and libm.a exist as files in the usual place for
consistency with other implementations. However, the run-time library bindings
are not contained in them. Instead, MVS data sets installed with the Language
Environment run-time library are used as the usual place to resolve run-time
library bindings. In the final step of the link-editing phase, any MVS load
libraries specified on the -l operand are searched in the order specified,
followed by searching these data sets. See the prefix_PLIB_PREFIX
description, as well as descriptions of the environment variables featured in the
following list.
prefix_ILSYSLIB
prefix_ILSYSIX
prefix_LSYSLIB
prefix_PSYSIX
prefix_PSYSLIB
This list of environment variables affects the link-editing phase of c89, but only
for non-XPLINK link-editing. See XPLINK (Extra Performance Linkage) in
“Options” on page 70.
The following list of environment variables affects the link-editing phase of c89,
but only for ILP32 XPLINK link-editing. See XPLINK (Extra Performance
Linkage) in “Options” on page 70.
prefix_ILXSYSLIB
prefix_ILXSYSIX
prefix_LXSYSLIB
prefix_LXSYSIX
The following list of environment variables affects the link-editing phase of c89,
but only for LP64 link-editing. See the description of LP64 in “Options” on page
70.
prefix_IL6SYSLIB
prefix_IL6SYSIX
prefix_L6SYSLIB
prefix_L6SYSIX
8. Because archive library files are searched when their names are encountered,
the placement of -l operands and file.a operands is significant. You may have
Chapter 2. Shell command descriptions 99