The following environment variables are used by the compiler when
you are compiling and linking your code. Many are built into the AIX® operating
system. With the exception of LANG and NLSPATH,
which must be set if you are using a locale other than the default
en_US, all of these variables are optional.
- LANG
- Specifies the locale for your operating system. The default locale
used by the compiler for messages and help files is United States
English, en_US, but the compiler supports other locales. For a list
of these, see National language support.
For more information on setting the LANG environment
variable to use an alternate locale, see your operating system documentation.
- LIBPATH
- Specifies an alternate directory search path for dynamically linked
libraries at application run time. If shared libraries required by
your application have been moved to an alternate directory that was
not specified at link time, and you do not want to relink the executable,
you can set this environment variable to allow the dynamic linker
to locate them at run time. For more information about this environment
variable, see your operating system documentation.
- NLSPATH
- Specifies the directory search path for finding the compiler message
and help files. You only need to set this environment variable if
the national language to be used for the compiler message and help
files is not English. For information on setting the NLSPATH,
see Enabling the XL C/C++ error
messages.
- OBJECT_MODE
- Optionally specifies the bit mode for compilation to either 32
or 64 bits. This is equivalent to the -q32 and -q64 compiler
options. Set the OBJECT_MODE environment variable
to a value of 32 for 32-bit compilation mode, or 64 for 64-bit compilation
mode. If unspecified, the default compilation mode is 32 bits. See
also -q32, -q64 for
more information.
- PATH
- Specifies the directory search path for the executable files of
the compiler. Executables are in /usr/vac/bin/ and /usr/vacpp/bin/ if installed
to the default location.
- TMPDIR
- Optionally specifies the directory in which temporary files are
created during compilation. The default location, /tmp/,
may be inadequate at high levels of optimization, where paging and
temporary files can require significant amounts of disk space, so
you can use this environment variable to specify an alternate directory.
- XLC_USR_CONFIG
- Specifies the location of a custom configuration file to be used
by the compiler. The file name must be given with its absolute path.
The compiler will first process the definitions in this file before
processing those in the default system configuration file, or those
in a customized file specified by the -F option; for more information,
see Using custom compiler configuration files.