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

Localization
Usage notes
the compiler is now able to recognize c89 defaults.The default
value is: 0 (zero). Actual variable names are:
_C89_NO_CMDOPTS, _CC_NO_CMDOPTS,
_CXX_NO_CMDOPTS
makedepend uses the LC_ALL localization environment variable, which specifies
the locale to be used to override any values for locale categories specified by
LANG or certain LC_ variables.
See Appendix F, “Localization” for more information.
1. MVS data sets may be used as the usual place to resolve C and C++ #include
directives during compilation.
Such data sets are installed with Language Environment. When it is allocated,
searching for these include files can be specified on the –I option as
//DD:SYSLIB. (See the description of environment variable {_CSYSLIB} for
information.
When include files are MVS PDS members, z/OS C/C++ uses conversion rules
to transform the include (header) file name on a #include preprocessor directive
into a member name. If the "//'dataset_prefix.+'" syntax is not used for the MVS
data set which is being searched for the include file, then this transformation
strips any directory name on the #include directive, and then takes the first 8 or
fewer characters up to the first dot (.).
If the "//'dataset_prefix.+'" syntax is used for the MVS data set which is being
searched for the include file, then this transformation uses any directory name
on the #include directive, and the characters following the first dot (.), and
substitutes the "+" of the data set being searched with these qualifiers.
In both cases the data set name and member name are converted to uppercase
and underscores (_) are changed to at signs (@).
If the include (header) files provided by Language Environment are installed into
the hierarchical file system in the default location (in accordance with the
{_INCDIRS} environment variable), then the compiler will use those files to
resolve #include directives during compilation. c89/cc/c++ by default searches
the directory /usr/include as the usual place, just before searching the data
sets just described. See the description of environment variables {_CSYSLIB},
{_INCDIRS}, and {_INCLIBS} for information on customizing the default
directories to search.
2. Feature test macros control which symbols are made visible in a source file
(typically a header file). c89/cc/c++ automatically defines the following feature
test macros along with the errno macro, according to whether or not cc was
invoked.
v Other than cc
–D "errno=(*__errno())"
–D _OPEN_DEFAULT=1
v cc
–D "errno=(*__errno())"
–D _OPEN_DEFAULT=0
–D _NO_PROTO=1
makedepend
c89/cc/c++add these macro definitions only after processing the command
string. Therefore, you can override these macros by specifying –D or –U options
for them on the command string.
Chapter 2. Shell command descriptions 419