Changes that affect compiler invocations

As of z/OS® V1R6 C/C++ compiler, compiler invocation is supported by two different utilities:

z/OS V1R6 C/C++ introduced the following utilities:

xlc command, to compile a C program
xlC and xlc++ commands, to compile a C++ program

z/OS V1R6 C/C++ introduced the following command suffixes:

_x suffix, which compiles the program with XPLINK
_64 suffix, which compiles the program under LP64

The utility you want to use depends on:

Whether you need to port code between z/OS and AIX®.
How you want to set up your build environment.

For example, you can use the command c89_x to compile an ANSI-compliant program with XPLINK.

Note: As of z/OS V1R7 XL C/C++, you no longer need to use command names with suffixes _x/_64 to compile/bind an XPLINK or 64-bit application. You can use suffixless command names with -qxplink/-q64 or -Wc,xplink/-Wc,lp64 and -Wl,xplink/-Wl,lp64 instead. For detailed information, refer to the c89 utility information in z/OS XL C/C++ User's Guide.

Table 1. Differences between the c89 and xlc compiler invocation utilities
	c89 utility	xlc utility
Command support	The c89 utility does not support The -S flag option introduced in z/OS V1R9. AIX options syntax.	The following commands accept AIX C/C++ as well as z/OS C/C++ options syntax: cc c89 cxx c++ The xlc utility does not support the TEMPINC compiler option.
Environment setup	Determined by environment variables	Determined by configuration file